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Emerson 2468CD User's Manual

1. IYLUN SPACE MOUNTING HOLE 24680504 EN o m N lt ETD a 15 tp Dod gd 4 ro s T ces NYLON SPACER FIXTURE e n HOLES FOR SECDNI rua 1 OUTPUT BOARD G 7 F ll 4 5 e peste 2 1 Ew E sr a LI L Swe 1 HUE teed E Lod N quid DIRECTION FOR E SIN i FAULT SIGNAL 3 41 m E app l 1 1 OPERATION a f id sr ipe 9 m eR DE 152 HOO EIU 4 Su EET b lt a al EMT prese 4 O L3 OFF SWITCH E n d SWITCH SW6 SHOWN IN IT S ELECTRODE POSITION a n ior E 1 pee Lena 4 j e EE 1 NEUE E
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3. p 5 wT gg a puc 1 qm r ER oee de 3 X NYLON SPACER FIXTURE n n FOR x rin r H4 E pe M dep rn 5 e c PE n Tim E Ld a 1 1 SEE 4 yl 1 N iL r1 LA i TEE ip spere 4 ni DIRECTION B A Ope FAULT SIGNAL ra B p de d d E 21 9 gt or 4 Sis a lt 1r 1 1 d PEN 7 L3 Ecos H OFF SWITCH Sw A SWITCH SW6 SHOWN IN IT S REN edt Z ELECTRODE POSITION n n lt NEL EE LJ je es S Rd B iI IIS a 1 l 41 ih pi 1 Jres 7I 2 LJ S L My uie cef ENERGISE IN ER oc uoc 1 ATE LJ gt D a d OE Q
4. ARE ROUTE ATION ECIFIC CABLES SEPARATE IF 2 EE SAL DI LO Figure 4 5 Daisy chain connection example for two remote displays 24685034 Hydrastep 2468CB amp 2468CD Manual Remote Display Options 24683B 0 4 4 4 CONNECTING CABLES TO THE REMOTE DISPLAY The following procedure can be used for each remote display that is to be connected 1 Gain access to the remote display terminal block On the 24683B and 24683C remote displays the terminal block is located at the rear of the unit The terminal block of the 24683D remote display is located within the unit and must be accessed as described in Section 4 3 2 2 Prepare the cable ends and fit identity sleeves to the leads 3 Fit the leads into the respective terminals see Figure 4 6 for details and tighten the terminal screws The interconnections for multiple remote displays are shown in the examples in Figure 4 4 and Figure 4 5 4 Ensure a stress free exit for the cable from the panel by providing any necessary cable support SIG VE from 2468 SIG VE from 2468 POWER OV from 2468 or local supply POWER VE from 2468 or local supply POWER VE from 2468 or local su
5. 5 m Fi pH i Note The following split pads lt s coe must be set as follows N n For Delayed Operation of the LN Nominated Relay a jemi RL1 SP21 bridged with solder i n TIT SP15 open circuited D Em 452024 p 57 l 812 SP22 bridged with solder D pa SP20 open circuited dc RL3 5 23 bridged with solder LUN Eum SP1 open circuited RL4 5 24 bridged with solder co gt SP6 open circuited gt 4 For No Delayed Operation of the G e Nominated Relay RL1 SP15 bridged with solder L gt SP21 open circuited EE RL2 5 20 bridged with solder ru A a SP22 open circuited B Me EHE RL3 SP1 bridged with solder 4 5 am SP23 open circuited wx RL4 5 6 bridged with solder S 5 5 24 open circuited xe _ L 5 LEGEND d n SELAY 1 SPLIT PADS IE RELAY 2 SPLIT PADS B3 p 21 9 RELAY 3 SPLIT PADS B 7 7 LI I 5 M ELAY 4 SPLIT PAD G4 d x g ae L pa m DELAY OPERATION Ld E 1 1 1 1 EE al 2 0 QPI PYP cB u ABC D
6. Figure 4 2 High pressure electrode 4 4 24675030 Hydrastep Pressure Parts Unit Description 4 3 24675030 WATER COLUMN L P The low pressure water column is manufactured from carbon steel extruded rectangular hollow bar The electrode ports are drilled and fitted with helicoil inserts to accept the electrodes This thread system gives greater strength than if the electrodes were mounted directly into tapped ports Corrosion of the threads is minimised since the helicoil inserts are made of stainless steel The top cap and the drain components of the water column are manufactured from forged carbon steel bar the drain components being available in 34 and 1 sizes A lug is machined on the top cap to accept a vertical forked member for support of the water column when in situ The steam and water connections are made from 1 N B SCH 80 carbon steel pipe with weld preps already machined to weld the water column to the steam system The electrode covers are fabricated from stainless steel with support blocks attached to the column body The covers are held in place by screw fasteners The complete assembly is of welded construction with the welding to ASME Ix requirements The materials and design are to ASME B31 1 The completed water column undergoes pressure proof tests at 150 of duty pressure after manufacture For further details o
7. VOLTAGE m SOURCE Sll LOAD LOAD FUNC TIONAL A EARTH ae E SOURCE CONNECTION PL2 3 4 DR 5 SINK CONNECTION 24685034 2 15 2468CB amp 2468CD Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual 2 4 2 6 Opto lsolated Fault Output Connection 2 16 WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover Plug PL4 is used for the FAULT output A 2 core screened cable capable of taking 1A and 30V is required and is connected into its 2 way terminal block such that Note No fault present Short circuit 1 1V at 1 Amp Fault present Open circuit lt 1 mA at 30V e The positive output conductor terminates in socket PL4 pin 2 e The negative output conductor terminates in socket PL4 pin 1 Gain access to PCB 24680515 and connect the FAULT output cable as follows 1 Prepare the FAULT output cable to give a stress free run to PL4 on PCB 24680515 Fault output wiring must not share cables with power inputs or electrode inputs and is considered good practice to twist the FAULT cable pairs together 2 Use a good quality RF cable gland and ensure there is a good annular ring shape connection with the screen 3 Prepare the conductor ends and connect the conductors into their respective terminal Check the cable run and tie
8. R vo mr DRAIN ET O0mm 0 98 MINIMUM STEAM BRANCH 1 N B Sch 8 30mm 0 98 MINIMUM IGHT RANGE STEAM WATER PITCH Bx E Z 1 79 rA do gt Z Os j UR z 55 E Ea ae pe SECTION o Figure 1 2 Low pressure water column 120bar 1740psi 1 4 24675030 Hydrastep Pressure Parts General Introduction FOR 300 bar 1 N B Sch XXS 168mnc6 38 TEAM BRANCH 1 N E sch 160 FOR 300 bor 1 z Hie lS PII SIT gt Ez amp N 9 N LA 2 5 aa e Figure 1 3 High pressure water column 210 bar 3045psi and 300 bar 4350psi 24675030 General Introduction Hydrastep Pressure Parts 1 6 24675030 Hydrastep Pressure Parts Installation Procedures 24675030 2 Installation Procedures Contents Page No 2 1 SCOPE OF PROCEDURES J J J 2 3 2 2 STORAGE mE 2 3 2 2 1 AMBIENT CONDITIONS L 2 3 2 2 2 PHYSICAL PROTEO TO N a aa aa 2 3 2 2 3 i Sea rere rr SS 2 3 2 2 4 HANDLING PRECAUTIONS
9. Ll A ul oO 9 2 21 D pl p 4 we 8 d d dzZj d 8 1 c x v x n fag BEEEEEEE amp 5 Cr ILI E Ex z E u DE 5 gcc UJ os x a I 1 m d Y 3o cT Fog TU ia Wau T LEO If e mE uz a 2 m m 2 A Le Figure 2 7 Electrode cable connections to 20 port column 24685034 2 WD 9 Wiring Diagrams for Dual Power Supply Version RK FROM F PIPE OR THE PIPE COLUMN IF LE T 2 WD 10 NOT THAN 18 BE LAG GEL Hydrastep 2468CB and 2468CD Manual EIS 5 45 42 E zs i HAT B TE 1 a aala 34 Badd 4 q E di d d zh E d 2 v H 5 5 R z oO 9 2 ime di die 1 E S 8 fo od gd d dd sa z
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11. 2 WD 9 Electrode cable connections to 22 port column 2 WD 10 Electrode cable connections to 24 port column 2 WD 11 Electrode cable connections to 26 port 2 WD 12 Electrode cable connections to 28 port column 2 WD 13 Electrode cable connections to 30 port column 2 WD 14 Electrode cable connections to 32 port column 2 WD 15 2 WD 1 Wiring Diagrams for Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual 2 WD 2 24685034 Hydrastep 2468CB and 2468CD Manual Wiring Diagrams for Dual Power Supply Version SURE 0 UNIC ENCLU 54 lt EL EL i EL i EL Em X EL EL r E lt 3 HYDRASTEP ELECTR 2 2 J EH Ag Su E 5 ul cim 74 X zE D 4 5 a J Lo Li A gt 2 mja gt ojo ala m TECH T v Q V
12. N N Table 3c 1 Electrode selections for opto isolated outputs Opto 1 to Opto 4 Example Single Input Board Electrode 13 selected mo Dual Input Boards Odd input board Electrode 25 selected Even input board Electrode 26 selected 24685034 3c 7 Opto isolated Output Board Option Hydrastep 2468CB amp 2468CD Manual 3c 3 1 2 Electrode Alarm Operation output 1 function only SW6 Opto isolated output from TR2 can be configured to receive either an electrode input or it can be used as the system fault output The two positions are detailed in Figure 3c 1 on page 3c 6 When configured as the system fault output the opto isolated output is energised low resistance in the normal non fault state and is de energised high resistance for a fault condition The system fault output connections are shown in the next section 3c 3 1 3 Opto Isolated Output Activation In Steam or In Water SW5 SW5 is a four channel switch one channel allocated per opto isolated output The choice presented by each channel switch is whether the output device is energised low resistance when the particular electrode is in water W or when that electrode is in steam S Switch SW5 is highlighted in Figure 3c 1 on page 3c 6 to provide additional information on ch
13. 2 30 2 6 1 3 Removing the Display Board 24680515 2 30 2 6 1 4 Refitting the Display Board 2 30 2 6 2 PARTS LIST HYDRASTEP 2468 amp CD VERSIONS 2 31 2 7 SPECIFICATION 2 32 Illustrations Figure 2 1 Outline drawing showing PCB layout and interconnections 2 4 Figure 2 2 Installation diagram for Hydrastep 2468 Electronic Gauging System unit 2 9 Figure 2 3 Enclosure cable layout for 16 electrode system 2 12 Figure 2 4 Voltage Selection 240V or 110V a 2 14 Figure 2 5 Location of display board links LK1 to LK5 amp switch SW1 with configuration delalS E Mr 2 21 Figure 2 6 Split pads SP1 SP2 SP5 amp SP6 locations and settings 2 22 Tables Table 2 1 Analogue output configurations 2 2 17 Table 2 2 Number of electrodes being displayed 2 20 Table 2 3 Fault analysis corrective action chart 2 23 24685034 Hydrastep 2468CB and 2468CD Manual 2468CB amp 2468CD Dual Power Supply Version 2 1 INTRODUCTION This chapter introduces the dual power supply version of the Hydr
14. Odd electrodes RH input board 3a 10 Alarm off when contacts open 3 4 4 Even electrodes LH input board RL1 N 1 v E 3 4 Even electrodes LH input board Switch SW5 is set to ES for low level alarms and set to EW for high level alarms 24685034 Hydrastep 2468CB and 2468CD Manual Relay Output Board Option 3a 3 2 4 Two out of Two Relay Alarm System This system requires both relays to operate to cause an alarm when their assigned electrodes register an alarm condition Case A Relays normally energised de energise both to trip Relays shown in de energised state PL2 PL2 BEA To alarm annunciator Odd electrodes Even electrodes RH input board LH input board Alarm off when contacts closed To alarm annunciator Odd electrodes Even electrodes RH input board LH input board Alarm off when contacts open Switch SW5 is set to ES for low level alarms and set to EW for high level alarms Case B Relays normally de energised energise both to trip Relays shown in de energised state To alarm annunciator Odd electrodes Even electrodes RH input board LH input board Alarm off when contacts closed To alarm annunciator Odd electrodes Even electrodes RH input board
15. 4 4 4 1 Unit Description 4 2 Hydrastep Pressure Parts 24675030 Hydrastep Pressure Parts Unit Description 41 LOW PRESSURE ELECTRODES These electrodes can be used for pressures of 50bar 725psi for 459600802 units and up to 120bar 1740psi for 459600602 units see Chapter 5 for Specifications They are used with the low pressure version of the Hydrastep water column shown in Figure 1 2 in Chapter 1 Part 2 of the manual Fitting instructions are supplied on the electrode package Electrode details for this version are shown in Figure 4 1 m E rin her ide her Extern In tor E trode 2 E M ket gt Ay a Tip Figure 4 1 Low pressure electrode 24675030 4 3 Unit Description Hydrastep Pressure Parts 4 2 HIGH PRESSURE ELECTRODES High pressure electrodes can be used for pressures in the range 50 725psi to 300bar 4350psi see Chapter 5 for Specifications These electrodes are used with the high pressure water column shown in Figure 1 3 in Chapter 1 Part 2 of the manual The fitting instructions for high pressure electrodes are included within the electrode package High pressure electrodes are supplied complete with ferrules fitted See Figure 4 2
16. 1 4 Figure 1 3 High pressure water column 210 bar 3045psi and 300 bar 4350psi 1 5 General Introduction Hydrastep Pressure Parts 1 2 24675030 Hydrastep Pressure Parts General Introduction 1 1 PRINCIPLE OF OPERATION The Hydrastep systems have been designed as electronic alternatives to conventional visual water gauges on boilers giving more reliable and safer water level indication The system is based on the significant differences in resistivities of water and steam over the range 100 C 212 F to 370 C 698 F Series 3 super critical components are used up to 560 C 1040 F A vertical row of electrodes is installed in the water column which forms a side arm attached to a boiler arid aligned typically such that an equal number of electrodes appear above and below the normal water level see Figure 1 1 The resistance measurement is made between the insulated tip of the electrode and the wall of the column The cell constant defining the actual resistance measured is determined by the length and the diameter of the electrode tip and the water column bore In practice the cell constant is chosen so that resistance in water is less than 100k ohms with a consequent resistance in steam of greater than 10M ohms Since the resistivities of water and steam are substantially different the system is simple and requires minimum setting up adjustments It is not critical in terms of power sup
17. LOSURE FRONT DOOF HYDRASTEP EN 2468 Figure 4 2 Interconnection cable for a single remote display 24685034 4 7 Remote Display Options 24683B C amp D 4 4 1 4 8 STAR AND DAISY CHAIN CONNECTIONS Hydrastep 2468CB amp 2468CD Manual Multiple remote display units can be connected to the main 2468 unit in two ways star or daisy chain See Figure 4 3 You can use either or both of these in whichever way best suits the relative locations of the 2468 unit and the remote displays The maximum cable length permitted between the 2468 and any remote unit is 1000 metres 2468 RDU 1 RDU 6 RDU 2 RDU 1 RDU 2 RDU 3 Star RDU 3 RDU 4 2468 RDU 5 Daisy Chain RDU 4 RDU 5 Figure 4 3 Star and daisy chain connections of remote displays RDU 6 24685034 Hydrastep 2468CB amp 2468CD Manual Remote Display Options 24683B C amp D 4 4 2 EXAMPLE OF A STAR CONNECTED SYSTEM Figure 4 4 shows two remote displays connected in a star Where more than one remote display is in use local supplies with isolated outputs must be used to power the extra unit s Up to six remote displays can be supported less their power requirements with the full complement of units in use three signal carr
18. ul ul ul 4 1 75 NE e 22 LJ Lu ul LJ 5 gt oo ale 5 NT 2 ii E ER Lc jf gt EC ped D hd i X ES a Figure 2 4 Electrode cable connections to 14 port column 2 WD 6 IPMENT PART No ASSEMBLY ITH EO ALLO zi 5 TO SUIT VE NOTE CATED EE PACKING Hydrastep 2468CB and 2468CD Manual TERMINAL RIN SONNECTORS CABLE NDANT REI 24685034 Hydrastep 2468CB and 2468CD Manual Wiring Diagrams for Dual Power Supply Version SURE 0 UNIC ENCLO a I Em EET ELT ELI 1 EL sl RING TERMINAL aj LJ LJ 1 gt e 1 l I m 1 ajd djdd dj ddd ge 1 z ES c la x zm n T 4418 5 4844 su E p RE m Pd decr O Lut pt E 5 gt l C E
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20. a 2 3 2 3 INSTALLATION OF WATER COLUNN 2 3 2 4 INSPECTION OF MECHANICAL INSTALLATION WORK 2 6 Illustrations Figure 2 1 Universal weld ennt 2 5 Figure 2 2 Typical water column installation 1 essen nnne 2 7 Figure 2 3 Typical water column suspension esiste 2 8 2 1 Installation Procedures 2 2 Hydrastep Pressure Parts 24675030 Installation Procedures Hydrastep Pressure Parts 2 1 2 2 2 2 1 2 2 2 2 2 3 2 2 4 2 3 24675030 SCOPE OF PROCEDURES The procedures apply to the Hydrastep Boiler Drum Water Level Equipment supplied by Mobrey who are responsible under their supply contract for delivery of all items of the above equipment listed in the delivery schedules Mobrey are not responsible for handling storage installation and protection of equipment on site However the procedures define the requirements for these activities which must be complied with to allow Mobrey to meet their contractual obligations for the efficient performance of equipment supplied by them The items of equipment are listed in detail on the Packing Note that is issued with the equipment to the site STORAGE AMBIENT CONDITIONS The storage area must be dry dust free and under cover Storage conditions should be controlled within the temperat
21. ines Pe 1 es ke r m I PL2 qp ae w 3 I TP 6 an 1 0 od e ipe po UK TM C gt i s Z I 34 P 4E SVE TR 8 PART OF 6E VE sS 3 d ey ho gE LY RELAYS SHOWN L DE ENERGISED View illustrating mounting positions of dual opto isolated boards 24685034 Opto isolated output PCB connectors 3c 5 Opto isolated Output Board Option Hydrastep 2468CB amp 2468CD Manual 3C 3 OPTO ISOLATED OUTPUT BOARD CONFIGURATION The 24680505 Opto isolated Output Board has three configuration switches e SW6 Selects Electrode or Alarm state for Opto output 1 e 5 1 5 4 Selects individual electrode for opto outputs to 4 SW5 steam or in water Selects Opto outputs 1 4 to be energised when electrodes in Figure 3c 1 provides a view of the output board layout to highlight configuration switches 4 ns T gg 1 d Ops NAE 3 OPTO OUTPUT I Tir TR a I ri MEET DEI ELE 3
22. 11 3c 3 2 5 Two out of Four Opto output Alarm System 12 3c 3 2 6 Two out of Three Opto output Alarm System 13 COMPONENT REPLACEMENT 14 3C 4 1 REPLACEMENT OF NYLON 14 3C 4 2 PARTS LIST OPTO ISOLATED OUTPUT BOARD 24680505 14 SPECIFICATION a u T aq 15 3c 1 Opto isolated Output Board Option Hydrastep 2468CB amp 2468CD Manual Illustrations Figure 3c 1 View of opto isolated board showing switch positions and output piri etal decries nee eA tt Mu Lee aree e tes 3c 6 Tables Table 3c 1 Electrode selections for opto isolated outputs Opto 1 to Opto 4 3c 7 3c 2 24685034 Hydrastep 2468CB amp 2468CD Manual Opto isolated Output Board Option 3C 1 3C 2 3C 2 1 3c 2 1 1 3c 2 1 2 24685034 GENERAL DESCRIPTION The Opto isolated Output Board PCB 24680505 has four opto isolated outputs and is mounted on top of the input board using 3 nylon spacers Electrical connection between the two boards is via a plug and a socket SK1 on the input board and PL1 on the opto isolated output board A second opto isolated output board may be mounted on top of the first on spacers Holes have been drilled on all opto isolated output boards to receive the 3 nylon spacers The top output board is offset towards the cent
23. o Tk x i x i 3i cM NS Ms UM a D In D D D D D D D Q f f 8 5 8 8 H 5 a a 5 E 5 2 59 53 5 5 2 y 1 H di H 4 M a zi a dod 5 2 95 ee a dub I thea eel ole aye I w E T Ee zu _ We a eO A 4 m ala gt 7 7 ME ox oo v Eu ad lt N f a ala Gl SE zd m 1 4 5 SWS DOUG uO ub gt gt H af SUME pa E eae Pie a gt 4 5 EE 2 Y aaa gt 1 m 3 J gt oo c f lt E yo sao e v zz a gt Ly FE Ju LJ gt 1 gt LJ 5 8 E zvaz 1 um e uw ai E ET 35404 2E HEI E T Pune cus a 735 222 ath 29 Zu PSU 242 2 WD 14 Figure 2 12 Electrode cable connections to 30 port column 24685034 Hydrastep 2468CB and 2468CD Manual Wiring Diagrams for Dual Power Supply Version
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25. zi Ll Ll Ll ma 2 MW OZ eua 2 m L m gt oo m m m A L IU BS 2 2 E r l lt a I Lu oS 7 Figure 2 2 Electrode cable connections to 10 port column ABLES 1 amp 2 ED PL BL 6 JNDANT TERMIN AL ING 24685034 Hydrastep 2468CB and 2468CD Manual Wiring Diagrams for Dual Power Supply Version ul Ge LU zo 25 225 v sca HJ E A oak 4d c 54 21 D D D Im D D O 3 1 3 Q 222 Lh 0 1 5i 7 EI l ii ri D dit 4 uc a 8 2 d dd d e 1 1 4434 55324 dz z L J LIN RE u m oe Lu 2 D Exp he am La p ej NX ud aa mm L DD m Fog Nie 2 d lt Lu c x cr N a
26. F THAN TO BE LAGGE BK ro e BL EI ET E EI UR EI D _ EL BN Al ALVE BL BLE 5 ae C T Ju 2 as a d u l x x Lg Ze 5 wank TI NEM t C x TAS 2 One l anos Figure 2 5 Electrode cable connections to 16 port column 24685034 2 WD 7 Wiring Diagrams for Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual ge T z ala z z x z t Lu zn E amp x 55 3 2 ieu eo to so lt 2 ieu eo t so n S joue oo e to co o H 2205 g 1 d A 46 n i 5 x 2 u a dod sl li d 1 71 m o 5 5 i LJ E a Ld a 2 LJ a 8 1 2 21 E D di rl di dit 1 x a a
27. U N E Wo lt c5 INI fe S Za 4 SG Z I Lu cn X d E 5 lt lt su Bp aequ Fi is 1 ZY cac E Y t 5 1 d 2252 jos o tog ES 25655 Telo eee HT HUI Bae a e el ELE 1 lt Figure 2 1 Electrode cable connections to 8 port column 24685034 2 WD 3 Wiring Diagrams for Dual Power Supply Version LOS E ELECTRONIC FROM OF TPABE 2 WD 4 Hydrastep 2468CB and 2468CD Manual u d 5 s hes xa ue i 11 gt EP S a E oi be m UE a dod a a dod a a dod a C Zil 1 p 771 zm ri ri rl ri uc j 5 1 SE Gol paasa Q q a BE d eis RE z aa 1884444 x B SS amp amp 1 zn Ed e Lu pel sr p N Lu vio ea v T gt OO mm Fog 4 6 e z ul 2 E diu DUO LJ EM T NE Hi Ww
28. 6 Refit the PCB s into the enclosure re connect the PCB s as required and close the enclosure cover Re apply power if required PARTS LIST DELAY RELAY OUTPUT BOARD 24680509 The following list items are available as spare parts E Mobrey Part Pare Mobrey Part Item Description Item Description Electrical Mechanical Delay relay PCB assembly 24680509B Spacer nylon 15 9 LG 412012080 Washer nylon 411999910 Socket 5 2 f 8 ocke ree 8 way 351508100 Nut M4 410031020 Socket 5K3 free 8 way 351503100 3b 17 Delay Relay Output Board Option 3B 5 SPECIFICATION Outputs Relay Contact Rating Maximum voltage Maximum current Maximum switching power For type nA safety Hydrastep 2468CB and 2468CD Manual 4 x Alarm Trip Relays ac dc 250V 125V 8A 8A 1500VA 240W lt 30 65W lt 60V 25W lt 125V 100mA at 30Vdc Maximum initial contact resistance 30 Time Delay 3b 18 Disabled or 0 8 0 8s to 24 2s 0 8s 24685034 Hydrastep 2468CB amp 2468CD Manual Opto isolated Output Board Option 3c 2468 Opto isolated Output Board Option 24685034 3C 1 3C 2 3C 3 3C 4 3C 5 Contents Page No GENERAL DESCRIPTIOLN 3 INSTALLATION 3 3C 2 1 STORAGE amp PRE INSTALLATION INSPECTION 3 36 2 1 1 Storage acre da du a opta c
29. 3 2 4 24675030 WATER COLUMN TRANSIENT RESPONSE Starting with the water level at or below mid gauge note the lowest steam indicating channel at this stage and fully close the water isolating valve nearest the water column quickly Time the rise in water level due to the condensate flow until the topmost channel changes to a water indication Now re open the water isolating valve fully and quickly Time the fall in water level from the change to steam at the topmost level to the change to steam at the channel immediately above the lowest channel to indicate steam at the start of the measurements The measured times should be similar to those obtained when the Hydrastep was first commissioned provided that the drum operating conditions are similar The usual times are in the region of 60 seconds for the rising levels and 5 to 15 seconds for the falling levels Any serious variation from these times for a standard length column suggests either a partial blockage or the water valve failing to seal properly Note A standard length column is 550mm 22 inches sight range Larger sight ranges will proportionally extend the water level rise and fall times WATER COLUMN OR PIPEWORK BLOCKAGE If a blockage either partial or complete is diagnosed from the response times isolate the column as described in Water Column Isolation sub section 3 1 2 With the drain valve open slowly open the steam isolati
30. 4 Undo the nut and washer securing the faulty spacer lt and extract it from its hole see inset diagram 5 Fit the new spacer in position align correctly on the na board and secure firmly using the M4 nut and nylon pad WASHER washer N 6 Refit the PCB s into the enclosure re connect the PCB s as required and close the enclosure cover Re apply power if required PARTS LIST OPTO ISOLATED OUTPUT BOARD 24680505 The following list items are available as spare parts Mobrey Part T Mobrey Part Item Description Item Description Electrical Mechanical PCB assembly 24680505A Spacer nylon 15 9 LG 412012080 Socket 5K free 8 way 351508100 Washer nylon 411999910 Nut M4 410031020 Socket 5K3 free 8 way 351503100 24685034 Hydrastep 2468CB amp 2468CD Manual 3C 5 24685034 SPECIFICATION Outputs Opto Isolated Output Rating Maximum Open circuit Voltage Maximum Short circuit Current Short circuit Voltage Drop Open circuit Leakage Current Opto isolated Output Board Option 4 x Alarm Trip Opto isolated outputs 1A 1 1V maximum at 1A 1mA at 30V dc 3c 15 Opto isolated Output Board Option Hydrastep 2468CB amp 2468CD Manual 3c 16 24685034 Hydrastep 2468CB amp 2468CD Manual Remote Display Options 24683B C amp D 4 Remote Display Options 24683B C amp D 24685034 4 1 4 2 4 3 4 4 4 5
31. 4 6 4 7 4 8 Contents Page No REMOTE DISPLAY OPTIONG csccesssssscesseccocsccecsacsecsecseseceessarsecaceares 4 3 CONFIGURATION 0 ccccscsscescecsececcecsecsecsecscceccorseccssccacsecsarsecaccarsecseesteasees 4 4 4 24 RECONFIGURING THE 24683B AND 24683C REMOTE DISPLAY 4 4 4 2 2 RECONFIGURING THE 246830 REMOTE 4 5 MECHANICAL INSTALLATION eerte ntn nnne 4 6 4 3 1 INSTALLING THE 24683B AND 24683C PANEL MOUNTED UNITS 4 6 4 3 2 INSTALLING THE 246830 WALL MOUNTED 4 6 ELECTRICAL INSTALLATION ernst srses nana 4 7 441 STAR AND DAISY CHAIN CONNECTIONS 4 8 4 442 EXAMPLE OF A STAR CONNECTED 4 9 443 EXAMPLE OF A DAISY CHAIN SYSTEM 4 10 414 CONNECTING CABLES TO THE REMOTE 4 11 4 1 5 CONNECTING THE DISPLAY CABLES TO HYDRASTEP 2468 4 12 SYSTEM OPERATION c cccscescoccessecsscsscecceesecsesacsacsessessceaccessacaccaceacenss 4 13 FAULT ANALYSIS AND CORRECTIVE 4 13 COMPONENT REPLACEMENT rennen nnns ns 4 16 SPECIFICATION rernm tessera sa trae 4 17 Remote Display Options 24683B C amp D Hydrastep 2468CB amp 2468CD Manual 4 2 Illustrations F
32. Hydrastep 2468CB and 2468CD Manual Relay Output Board Option In the following diagrams 6A 8 6B O indicate the electrode channel selected for each relay A fully functioning system NO FAULTS will perform a low level trip at electrode level 2 For a high level trip using electrode channels 9 10 11 and 12 respectively and switch SW5 set for ES a healthy system would trip at level 11 Case A Relays normally energised de energise one in each pair to trip Relays shown in de energised state PL 2 PL2 RL 1 RL 1 Be A To alarm LE annunciator or tripping 5 gt device RL 2 s gt gt Odd electrodes Even electrodes RH input board LH input board Alarm off when contacts closed Switch SW5 is set to EW for low level alarms and set to ES for high level alarms Case B Relays normally de energised energise one in each pair to trip Relays shown in de energised state PL2 To alarm annunciator or tripping device Odd electrodes RH input board Even electrodes LH input board Alarm off when contacts open Switch SW5 is set to EW for low level alarms and set to ES for high level alarms 24685034 3a 13 Relay Output Board Option Hydrastep 2468CB and 2468CD Manual 3a 3 2 6 Two out of Three Relay Alarm System In the following diagrams 7A amp
33. LN at gt T sw q m o We Lu va z x TE Sje c ain s o gt a 35 3c Tm 42 uz ms eue Xu tu Figure 2 8 Electrode cable connections to 22 port column 24685034 Hydrastep 2468CB and 2468CD Manual RK FROM F PIPE OR THE PIPE COLUMN 24685034 Wiring Diagrams for Dual Power Supply Version ou Tun SURE n i d ENCLO a I OT USE 1 4 EL EL L ELIS 080 8 I S BL HF ars s b n 2 v1 x 2 i 4 f E 1 M LE x fd 2 gia dud ae ae 4 E I lc Y x n DR 4444 AB m 21515 215 zzz dz PERRE n ek 21 49 UE o au 4 ee A aL aE 2 mja 5 oo y 2E sa x
34. 5 9 1 2k Hi Hi di C lt gt 55 x d d jj vM i 3 oW E oe p d djdd Za E oe 7 T 1 als pec FEN uJ x zz Se E ga alas 22120 oe T u dy Eu d 2155 oe Ze m pu 2 xX ala L x NE N go llo st e E DE TEAM ISOLATI ALVES wasi 1 5 E e T E Figure 2 10 Electrode cable connections to 26 port column 2 WD 12 24685034 Hydrastep 2468CB and 2468CD Manual Wiring Diagrams for Dual Power Supply Version ge n 1 a 4 ae 2 d E do d d dod d do od 4 I I d ek 4 BS m 5 5 5 5 a a im a 5 Cog 5 5 5 a 1 1 z ipi D D rli rl I 95 4 E 2 e d da d Z I 5 EFEFEFFFEH EFEFE 1 X
35. Hydrastep 2468CB and 2468CD Manual 3B 2 3 3b 2 3 1 3b 2 3 2 24685034 Delay Relay Output Board Option ELECTRICAL INSTALLATION This sub section deals with the output of the states of the four relays Two 8 way sockets are provided with each output board through which the relay outputs are delivered to their external destinations PCB Interconnections Signal interconnection between the input board PCB1 and the output board PCB 9 is direct via the SK1 PL1 12 way Berg connectors When two output boards are fitted the top board s plug PL1 engages in the lower board s SK1 Relay Output Connections The relay outputs can be taken out of the enclosure via the gland plate if used or along with the other cables in suitable trunking Use screened cables for all connections making sure a good annular ring shape connection is made with a good quality RF cable gland The run must be stress free and it is considered good practice to twist relay pairs together Since the output board is mounted on top of the input board the routing of the relay cabling should take the same kind of formation as the electrode cabling but separated from it as far as practical The cable should be arranged such that the cables do not lie across any of the PCBs The layout and plug pin details of the two plugs on the relay board is given in the diagram on the right with the relay contacts shown in their de energised state When two output boar
36. Screw in type M18 x 1 5 Insulator Zirconia ceramic Rating 120 bar 1740 psi at 370 C 698 F pH range 7 11 Hydrostatically tested to 180 bar 2610 psi at ambient temp Complete with sealing gasket Metaflex Screw in type M18x 1 5 Insulator PTFE or Teflon Rating 50 bar 725 psi at 260 C 500 F pH range 7 13 5 Hydrostatically tested to 155 bar 2247 psi at ambient temp Complete with ferrule sealing 25mm AF nut thread x 20 tpi UNEF form Swagelok Parker Insulator High purity alumina ceramic Rating 300 bar 4350 psi max at 560 C 1040 F pH range 7 11 Hydrostatically tested at 450 bar 6525 psi at ambient temp Note For Super Critical Applications Only Complete with ferrule sealing 22mm AF nut thread 34 x 20 tpi UNEF form Swagelok or Parker Insulator PTFE or Teflon Rating 50bar 725 psi at 260 C 500 F pH range 7 13 5 Hydrostatically tested at 155 bar 2247psi at ambient temp Complete with ferrule sealing 22mm AF nut thread 34 x 20 tpi UNEF form Swagelok or Parker Insulator PTFE or Teflon coated ceramic Rating 300bar 4350 psi at 260 C 500 F pH range 7 13 5 Hydrostatically tested at 450 bar 6525psi at ambient temp Complete with ferrule sealing 22mm AF nut thread 34 x 20 tpi UNEF form Swagelok or Parker Insulator Zirconia ceramic Rating 210 bar 3045 psi at 370 C 698 F pH range 7 11 Hydrostatically tested at 315 bar 4568 psi at ambien
37. This sub section deals with the four opto isolated outputs Two 8 way sockets are provided with each output board through which the opto isolated outputs are presented to their external destinations via transistors TRs 2 4 6 and 8 3c 2 3 2 Opto lsolated Output Connections The opto isolated output states can be taken out of the enclosure via the gland plate if used or along with the other cables in suitable trunking One or more cables can be used at the discretion of the user however the cables must be screened and the screens terminated at the gland plate Since the output board is mounted on top of the input board the routing of the relay cabling should take the same kind of formation as the electrode cabling arranged such that the cables do not lie across the PCBs The layout and plug pin details of the two affected plugs on the output board is given in the diagram on the right with the required opto coupler output terminal polarities shown When two output boards are fitted the output terminals of the uppermost output board are offset towards the centre of the input board SECOND ET PLe OUTPUT ifa BOARD TR4 I 27178 TRE ON TRE 4 VE AD _ gt APN FIRST TR 4 o aN OUTPUT 6E vE pa Ns BOARD NAE xY 20 A 32 5 L WS lt b 84 8 VE j 1
38. can be selected as the input for any of the relays With one input board installed any electrode connected to the system can be used as the source for any of the four relays With two input boards installed the relay board mounted on the input board connected to the odd numbered electrodes accepts inputs from the odd numbered electrodes Similarly the relay board mounted on the input board connected to the even numbered electrodes accepts inputs from even numbered electrodes Table 3a 1 details switch selection Switch SW1 SW2 SW3 or SW4 Electrode Selection Settings for RL1 to RL4 respectively Switch Contacts One Input Two Input Cards Card Odd I P Card Even I P Card On On On On 1 1 2 Table 3a 1 Electrode selections for relays RL1 to RL4 Example Single Input Board Electrode 13 selected HE Dual Input Boards Odd input board Electrode 25 selected a Even input board Electrode 26 selected F 24685034 3a 7 Relay Output Board Option Hydrastep 2468CB and 2468CD Manual 3a 3 1 3 Relay Energisation In Steam or In Water SW5 This is a four channel switch one channel allocated per relay The switch selects whether the relay is energised when the selected electrode is in water or is in steam This switch is highlighted in Figure 3a 1 on page 3a 6 to provide additional information on channel identity and the switch e
39. eunsu3 jueuudinbo y jo epis eui surejdxe uoiuw 99 JO Z puejsJepun pue pedal 5 NO 021 e 1oj parddns osje swesHeip eui SIU 1 sulejs s dejseJp H pal ddns si uoruw yooqpueu pue sjueuoduioo y 0U ejdoed snoueA y eJnsue Bye uees eq 01 5591 eu os 5 d lseup H e uexel 15 129 BOD eseo eui si SIU A jexrjun SI 1nq eAnoejep yury eq 1 Jeuueui ensnun ue ui Jeu 4n290 paesu A jeuuou s dejseJp H Jeu seaje JO eui 0 x Aney si paseyoind jueuidinbo y ey jou s op SIUL xx Uonejeisu dayseupAH Meu e uo uees suomnipuoo 9599 JO eulos ey eigissod si 1 18715 d31SVHGAH About this manual This manual describes the Hydrastep 2468CB and 2468CD Electronic Gauging Systems along with the recommended options Except where stated otherwise the information contained in this manual can be assumed to apply to either system This man
40. lada T 4 4 j 4 Xu H 4 n 4s j zi ay 7 0 n a Bs PA 1 TE A PS 22 ala 2 2 Qm zum uo TEL ano a aa zl gt N 55 faa oo Y 8 x 5O Lu 0 O LJ OLIO SO LIO DOWD gt O Lir SHO wt D Lic e 5 k Aeee e e EN Y aas EIE 7 1 mm OL gt D aa m mm JE gt gt Ia EL 1 gt lt maaa w ISOLA RE CABLE a d u z alta sts T ea 10 a 72 58 92 NET Boe SH z LQ c3 a Ar lt mm 2 qu Ec Figure 2 11 Electrode cable connections to 28 port column 24685034 2 WD 13 Wiring Diagrams for Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual 5 BE an ol
41. va TYPE APPROVED Do Not Open When Energised TYPE 2468 Temp 20 to 70 C Ingress Protection IP65 NEMA 4X Made in UK by Mobrey Ltd Slough SL1 4UE UK www mobrey com Figure 1 1 Front panel of the Hydrastep 2468 gauging system 1 2 24685034 Hydrastep 2468CB and 2468CD Manual Introduction to the Hydrastep 2468 Electronic Gauging System 1 1 24685034 WATER LEVEL MEASUREMENT The Hydrastep 2468 Electronic Gauging System is designed as an electronic alternative to water level gauges on boilers giving a more reliable and safer water level indication than conventional visual gauges It uses the significant difference in resistivities of water and steam in temperatures up to 370 C 698 F to determine the water level STEAM FROM BOILER R h pH 4 AE gt pe A ATER COLUMN WALL 2 2 i 2 J ELECTRODE INSERT ap A P ELECTRODE gt 2 r JE f 2 EL m 2 gt W NE r Z Z o foe A GZ ELECTRODE A LA LEADS A 248 Shem C EARTH CONNECTION EXP ESCAS FEED WATER FROM BOILER Figure 1 2 Schematic of resistance measuring cell and electrodes A vertical
42. 2 1 RECONFIGURING THE 24683B AND 24683C REMOTE DISPLAY The procedure for reconfiguring the 24683B and 24683C for operation with 18 to 32 electrodes is 1 Undo the four screws securing the rear panel and remove the panel 2 Withdraw the decoding PCB from the rear of the display unit Some force may be necessary initially to disengage the decoding PCB from the LED PCB 3 Carefully remove the link headers from sockets LK2 and LK4 on the decoding PCB by easing them out with a suitable flat bladed screwdriver See Figure 4 1 4 Fit the link headers removed in step 3 into sockets LK1 and LK3 5 Refit the decoding PCB and the rear panel Note This figure shows the layout of the decoding pcb fitted to the 24683C and 24683D Remote Displays The layout of the decoding pcb in the 24683B Remote Display is slightly different but the arrangement of links LK1 LK4 is the same LK1 dm ds cc LK2 C us LK3 Figure 4 1 Location of link headers for selecting the display mode 4 4 24685034 Hydrastep 2468CB amp 2468CD Manual Remote Display Options 24683B C amp D 4 2 2 24685034 RECONFIGURING THE 24683D REMOTE DISPLAY The procedure for reconfiguring the 24683D for operation with 18 to 32 electrodes is 1 2 Undo the four screws securing the transparent cover and remove the cover Undo the
43. 3 2 Relay Output 5 RELAY BOARD CONFIGURATION 6 3A 3 1 RELAY OUTPUT BOARD u u u 7 3a 3 1 1 Configuring the Relay Output 7 3a 3 1 2 Electrode Relay Selection Relays RL1 RL2 RL3 amp RL4 SW1 To SWA i evade de a a ee embed dede Ode 7 3a 3 1 3 Relay Energisation In Steam or In Water SWb 8 3a 3 1 4 Electrode Alarm Operation RL1 Function Only SW6 8 3a 3 1 5 System Fault 8 3A 3 2 ALARM AND TRIPPING FACILITIES 9 3a 9 2 4 Philosophy ict iecit eit les E 9 3a 3 2 2 Relay Interconnections for Alarm Tripping Systems 9 3a 3 2 3 One out of Two Relay Alarm System 10 3a 3 2 4 Two out of Two Relay Alarm System 11 3a 3 2 5 Two out of Four Relay Alarm System 12 3a 3 2 6 Two out of Three Relay Alarm System 14 COMPONENT REPLACEMENT 15 3a 4 4 REPLACEMENT OF NYLON SPACERS 15 3a 4 2 PARTS LIST RELAY OUTPUT BOARD 24680504 15 SPECIFICATION 16 3a 1 Relay Output Board Option Hydrastep 2468CB and 2468CD Manual Illustrations Figure
44. 6B O indicate the electrode channel selected for each opto output A fully functioning system NO FAULTS will cause a low level trip at electrode level 2 Using high level electrode channels and SW5 set to 5 the circuit can perform a high level trip Note Inputs from electrodes 1 amp 2 are applied to two separate opto outputs on their respective boards Case A circuit normally open circuit short circuit two to trip PL2 PL2 Note External power must 3 TR2 2 1 be applied as shown See specification for 2 2 power requirements 3 3 Opto output 1 4 Opto output 1 4 VE 5 To alarm TR4 TR4 5 annunciator 9 2 or tripping 6 6 device 7 7 VE Opto output 2 8 Opto output 2 8 Even Electrodes LH Input Board TR6 1 1 Opto output 3 4 gt Odd Electrodes RH Input Board PL3 Switch SW5 is set to S for low level alarms and set to W for high level alarms Case B Opto output circuit normally short circuit open circuit to trip Note External power must be applied as shown See specification for power requirements Opto output 1 Opto output 1 To alarm annunciator or tripping device Opto output 2 Even Electrodes LH Input Board Opto output 3 Odd Electrodes RH Input Board Switch
45. 7B O indicate the electrode channel selected for each relay A fully functioning system NO FAULTS will cause a low level trip at electrode level 2 Using high level electrode channels and SW5 set to ES the circuit can perform a high level trip Note Inputs from electrodes 1 amp 2 are applied to two separate relays on their respective boards Case A Relays normally energised de energise two to trip Relays shown in de energised state RL 1 PL2 RL 1 PL2 E pg NT alarm Av annunciator ti or tripping 5 5 device Ll gs E ME RL3 Even electrodes 1l LH input board 5 E gt Alarm off when contacts closed 4 Odd electrodes RH input board PL3 Switch SW5 is set to EW for low level alarms and set to ES for high level alarms Case B Relays normally de energised energise two to trip Relays shown in de energised state To alarm annunciator or tripping device Even electrodes LH input board Alarm off when contacts open Odd electrodes RH input board PL3 Switch SW5 is set to EW for low level alarms and set to ES for high level alarms 3a 14 24685034 Hydrastep 2468CB and 2468CD Manual Relay Output Board Option 3A 4 COMPONENT REPLACEMENT The relay board contains no replaceable
46. Enter the cable through the gland port in the 2468 enclosure if this is applicable and ensure a stress free run inside the enclosure Prepare the cable ends fit identity sleeves on the leads and connect them to their respective terminals See the example in Figure 4 5 Ensure that the cable screen is grounded at the gland plate 24685034 Hydrastep 2468CB amp 2468CD Manual Remote Display Options 24683B C amp D 4 5 SYSTEM OPERATION When the system is brought on line check for complete agreement between the remote display and the Hydrastep level indicator display 4 6 FAULT ANALYSIS AND CORRECTIVE ACTION Analysis and Corrective Action No display of odd LEDs Loss of power to Check that the wiring to connector PL1 in the remote including bottom half of remote display unit display unit is correct fault LED With a suitable meter check that the supply voltage is present at the remote display unit connector Ensure that the voltage is in the range 14V through 45Vdc If the unit is locally powered and no voltage is present check the voltage at the local power source If the unit is powered from the 2468 electronics unit check the voltage between pins 5 and 8 of PL3 on the display board 24680502 of that unit A voltage of less than 14Vdc indicates the possibility of a short circuit in the power lines or a fault on the display board Disconnect connector SK3 from the display PCB in the 2468 electronics unit and re ch
47. LH input board Alarm off when contacts open Switch SW5 is set to ES for low level alarms and set to EW for high level alarms 3b 12 24685034 Hydrastep 2468CB and 2468CD Manual Delay Relay Output Board Option 3b 3 2 4 Two out of Two Relay Alarm System 24685034 This system requires both relays to operate to cause an alarm when their assigned electrodes register an alarm condition Case A Relays normally energised de energise both to trip Relays shown in de energised state PL2 PL 2 To alarm annunciator t Odd electrodes RH input board Even electrodes LH input board To alarm annunciator Odd electrodes RH input board Even electrodes LH input board Alarm off when contacts open Switch SW5 is set to ES for low level alarms and set to EW for high level alarms Case B Relays normally de energised energise both to trip Relays shown in de energised state PL2 To alarm annunciator Odd electrodes RH input board Even electrodes LH input board Alarm off when contacts closed PL2 PL2 To alarm annunciator Odd electrodes RH input board Even electrodes LH input board Alarm off when contacts open Switch SW5 is set to ES for low level alarms and set to EW for high level alarms 3b 13 Delay Relay Output Board Option Hydrastep 2468CB
48. LH input board Alarm off when contacts open Switch SW5 is set to ES for low level alarms and set to EW for high level alarms 24685034 3a 11 Relay Output Board Option Hydrastep 2468CB and 2468CD Manual 3a 3 2 5 Two out of Four Relay Alarm System In the following diagrams amp 5B O indicate the electrode channel selected for each relay A fully functioning system NO FAULTS will perform a low level trip at electrode level 3 For a high level trip using electrode channels 11 12 9 and 10 respectively and switch SW5 set for ES a healthy system would trip at level 10 Case A Relays normally energised de energise one in each pair to trip Relays shown in de energised state To alarm annunciator or tripping device Odd electrodes Even electrodes RH input board LH input board Alarm off when contacts open Switch SW5 is set to EW for low level alarms and set to ES for high level alarms Case B Relays normally energised de energise one pair to trip Relays shown in de energised state RL 1 2 RL 1 4 To alarm annunciator or tripping device RL2 RL2 al 9 Even electrodes LH input board Odd electrodes RH input board Alarm off when contacts open Switch SW5 is set to EW for low level alarms and set to ES for high level alarms 3a 12 24685034
49. Output Board Option Chapter 4 Remote Display Options 24683B C amp D 24685034 Pt 1 5 Pt 1 6 24685034 Hydrastep 2468CB and 2468CD Manual 24685034 Introduction to the Hydrastep 2468 Electronic Gauging System 1 Introduction to the Hydrastep 2468 Electronic Gauging System Contents Page No 1 1 WATER LEVEL 5 121001222 3 1 2 HYDRASTEP 2468 ELECTRONIC GAUGING SYSTEM 5 1 2 1 INPUT BOARDS 222 aieo edt di Mal le eel 5 1 2 2 DISPLAY BOARDS LESSER Pda e pda 5 1 2 3 SYSTEM FAULTS 2468CB OR 2468 0 6 1 3 SYSTEM OPTIONS Q esten SEE sien 6 1 3 1 OUTPUT BOARDS diae de eig ood ain dic 6 1 3 2 REMOTE DISPLAY UNITS 6 1 3 3 OPTION DETA CS u uu Ln ener ek 6 1 4 HYDRASTEP 2468 UPGRADE PATHS AND AVAILABLE OPTIONS 7 Illustrations Figure 1 1 Front panel of the Hydrastep 2468 gauging system with local display 2 Figure 1 2 Schematic of resistance measuring cell and electrodes 3 Figure 1 3 Typical Hydrastep 2468 System 4 Tables Table 1 1 Upgrade paths and available options esee 7 1 1 Introduction to the Hydrastep 2468 Electronic Gauging System Hydrastep 2468CB and 2468CD Manual HYDRASTEP CE APPROVED a S TAS
50. PWW DATE 24 11 05 DRG NO 24685037 SHEET 2 of 2 Drawing 24685037 Sheet 2 of 2 Hydrastep Control Diagram Notes for Sheet 1 Appendix A CSA Approval Hydrastep 2468 Technical Manual Operating Manual 24685034 Rev AE Hydrastep 2468 June 2011 The Emerson logo is a trade mark and service mark of Emerson Electric Co Mobrey is a registered trademark of Mobrey Ltd All other marks are the property of their respective owners We reserve the right to modify or improve the designs or specifications of product and services at any time without notice 2011 Mobrey Ltd All rights reserved International Emerson Process Management Mobrey Ltd 158 Edinburgh Avenue Slough Berks SL1 4UE UK T 44 1753 756600 2 44 1753 823589 www mobrey com EMERSON
51. Storage Area The storage area must be dry dust free and kept at a reasonable temperature The storage area should allow for access and inspection of all items of equipment Pre Installation Inspection Open the option package and inspect the contents for signs of damage Check contents for completeness 3b 3 Delay Relay Output Board Option Hydrastep 2468CB and 2468CD Manual 3B 2 2 3b 2 2 1 3b 2 2 2 3b 4 MECHANICAL INSTALLATION The output board is mounted directly on top of the input board The input board is supplied with three nylon spacers fitted The output board is then aligned on its Berg socket plug interconnection PL1 SK1 and input board mounted spacers and pressed home on to the spacers When two output boards are required to be mounted on an input board the second output board is mounted on three nylon spacers fitted on the first mounted output board Fitting the Nylon Spacers to the Delay Relay Output Board The spacers fit into the holes within the white bordered areas on the output board see Figure 3b 1 on page 3b 6 1 Fit the nylon spacers into their prepared holes on the output board and lock in position using the nylon SPAC washer and M4 nut see inset diagram 2 Fit the output board on to the spacers and check for correct alignment and adjust if necessary ART OF Mounting the Delay Relay Output Board on to the Input Board WARNING Mains voltages are present in this ins
52. alarm The following are examples of opto output configurations used 3c 9 Opto isolated Output Board Option Hydrastep 2468CB amp 2468CD Manual 3c 3 2 3 One out of Two Opto output Alarm System 3c 10 Either of the opto outputs involved can signal an alarm when their assigned electrode detects a water steam interface change The alarm condition is selected by switch SW5 to provide an opto output in conducting mode in water W or in a conducting mode in steam S Case A circuit normally open circuit short circuit either one to trip To alarm annunciator or tripping device PL2 VE VE PL2 Opto output 1 Opto output 1 Odd Electrodes Even Electrodes RH Input Board Note External power must LH Input Board be applied as shown See specification for power requirements Switch SW5 is set to S for low level alarms and set to W for high level alarms Case B circuit normally short circuit open circuit either one to trip To alarm annunciator or tripping device PL2 VE VE PL2 Opto output 1 Opto output 1 Odd Electrodes Even Electrodes RH Input Board Note External power must LH Input Board be applied as shown See specification for power requirements Switch SW5 is set to W for low level alarms and set to S for high level alarm
53. and 2468CD Manual 3b 3 2 5 Two out of Four Relay Alarm System In the following diagrams amp 5B O indicate the electrode channel selected for each relay A fully functioning system NO FAULTS will perform a low level trip at electrode level 3 For a high level trip using electrode channels 11 12 9 and 10 respectively and switch SW5 set for ES a healthy system would trip at level 10 Case A Relays normally energised de energise one in each pair to trip Relays shown in de energised state RL1 PL 2 To alarm annunciator or tripping device RL2 9 Odd electrodes Even electrodes RH input board LH input board Alarm off when contacts open Switch SW5 is set to EW for low level alarms and set to ES for high level alarms Case B Relays normally energised de energise one pair to trip Relays shown in de energised state PL2 PL2 RL1 RL1 Y i 1 Pa 2 2 Ld ES L A To alarm 4 gt annunciator or tripping 5 gt 5 device Odd electrodes Even electrodes RH input board LH input board Alarm off when contacts open Switch SW5 is set to EW for low level alarms and set to ES for high level alarms 3b 14 24685034 Hydrastep 2468CB and 2468CD Manual Delay Relay Output Board Option 3b 3 2 6 Two out of Four Relay Alarm System contd In the following
54. board is mounted on the rear of the front panel with the LEDs protruding through the front panel e Up to four output boards Relay Board PCB 24680504 Relay with time delay Board 24680509 or Opto isolator Board PCB 24680505 may be fitted two per input board Output board mounting pillars are fitted to each input board during manufacture to support the first output board mounted Refer to Figure 2 1 on page 2 4 for an annotated view of the internal layout of the unit 24685034 2 3 2468CB amp 2468CD Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual 20 Ow v amp Lo CB gy 5 on 1 p c 0 5 c L Es E C BS p os gt 5 oo 5 EX E 15 9 e eR 2210 oe ct Qc Fo Y A 9 i 28 ap S 5 qc is 4 3 gt pe oo M n 1 is 5 c Pc ns it lt lt P P REN d Q Siu A Y oa Figure 2 1 Outline drawing showing PCB layout and interconnections 2 4 24685034 Hydrastep 2468CB and 2468CD Manual 2468CB amp 2468CD Dual Power Supply Version 2 3 1 2 3 1 1 2 3 2 24685034 INPUT BOARD PCB 24680501 AND PCB 24680516 T
55. condensate circulation The water leg must slope downwards to the drum to prevent water from being trapped at the bottom of the water column Caution Care must be exercised to ensure that the pipework is not allowed to take the unsupported weight of a standard water column The weight of the column and its associated pipework are fully supported there must not be any load on the welded pipework attachment points Installation should commence with the support of the column see Figure 2 3 The water column is attached to the supports which will carry the weight of the water column and allow it to be accurately aligned with the drum steam and water connections before and during the welding operation After the welding to the connecting pipework valves and the fitting of the drain pipework is complete a further check on the level alignment must be carried out and adjustments made if necessary 24675030 2 5 Installation Procedures Hydrastep Pressure Parts 2 4 2 6 The water connection to the water column must be fully insulated by lagging The steam connection must also be lagged but a minimum length of 0 5 metre of the steam leg must be left unlagged where the steam leg joins the water column see Figure 2 2 Lagging the water column will reduce the density error provided that 0 5 metre minimum of the steam leg is left unlagged If errors in the water level indication are observed it may be necessary to lag the water
56. connected De energise before opening front cover Plug PL1 on each input board is used for the analogue output A 2 core screened cable is required and is connected into a 2 way socket such that e The positive output conductor terminates in socket SK1 pin 1 e The negative output conductor terminates in socket SK1 pin 2 Gain access to each PCB 24680501 and connect the analogue output cable as follows 1 Pass the analogue cable through its gland m if applicable and into the enclosure 4 2 Prepare the analogue cable to give stress ART free run to PL1 on each PCB 24680501 allowing for double turn to pass through a INPUT ferrite BOAR nr o Analogue wiring must not share cables with power input electrode input or relay output It is considered good practice to twist the analogue pairs together 3 Use a good quality RF cable gland and ensure there is a good annular ring shape connection with the screen A ferrite Supplied must be attached to each analogue pair inside the enclosure as close to the cable gland as possible Make a double turn through each ferrite 4 Prepare the conductor ends fit the crimp connectors and connect the cores into their respective socket SK1 terminals 5 Fit the socket into plug PL1 and check the cable run
57. d d a a 38 2 A 1 FEE pes ae E 1 E i 2j ig ain E 2 x a T TE x Q ea a ojo ala AES x E BEL SUE Ar N Q N S N N V ul ul WOM O LJ LJO ee F E ME oa 65 x oja AO oO lt 0 m as ecl 41 4 LJ gt ne x L y 1 TE a m L8 m ELIT om n ehe m eT 95 E La 5 552 n SESS Ps uw glut O 2 I Our E r T En PRES 2 1 1 Lo x c5 T am US az pi mo 2 ez 2 2 21 Figure 2 6 Electrode cable connections to 18 port column 2 WD 8 24685034 ABLE SN BL PL amp GY NDANT RED Hydrastep 2468CB and 2468CD Manual Wiring Diagrams for Dual Power Supply Version ANALOGUE TPUT BN 5 _ BK SURE us UNIC ENCLO lt EL 5 ag 137 EL lt ee EL I El H I as e I EL lt lt
58. diagrams 6A 8 6B 0 indicate the electrode channel selected for each relay A fully functioning system NO FAULTS will perform a low level trip at electrode level 2 For a high level trip using electrode channels 9 10 11 and 12 respectively and switch SW5 set for ES a healthy system would trip at level 11 Case A Relays normally energised de energise one in each pair to trip Relays shown in de energised state RL PL2 RL PL2 aed ipe m gt EZ A To alarm 4 4 gt annunciator 0 A or tripping 5 gt device UU SL EE IE 8 a Odd electrodes Even electrodes RH input board LH input board Alarm off when contacts closed Switch SW5 is set to EW for low level alarms and set to ES for high level alarms Case B Relays normally de energised energise one in each pair to trip Relays shown in de energised state To alarm annunciator or tripping device Odd electrodes Even electrodes RH input board LH input board Alarm off when contacts open Switch SW5 is set to EW for low level alarms and set to ES for high level alarms 24685034 3b 15 Delay Relay Output Board Option Hydrastep 2468CB and 2468CD Manual 3b 3 2 7 Two out of Three Relay Alarm System In the following diagrams 7
59. electronic enclosure from the mains supply and open the lid 2 Disconnect the ribbon cable socket and the display board power cable socket from the display board see Figure 2 1 Remove remote display and system fault connections if applicable 3 Undo the five securing nuts and remove them and their washers Lift off the display board from the attachment pillars Refitting the Display Board To refit the display board carry out the removal procedure in the reverse order Note Special attention must be taken to ensure the lid screening is satisfactory after any display board refitting The screening cable is taken to the bottom left hand securing screw on the display plate and this connection must have good conductivity 24685034 Hydrastep 2468CB and 2468CD Manual 2468CB amp 2468CD Dual Power Supply Version 2 6 2 PARTS LIST HYDRASTEP 2468 CB amp CD VERSIONS nae Mobrey inti Mobrey Item Description Item Description Electronic Enclosure 24685034 Input PCB assembly 2468CB 24680501C Display PCB assembly 24680515B Fuse link 200mA T ceramic K9634 Header programmable 10 way 399100380 Fuse link 400mA T ceramic K9635 Header programmable 8 way 399100390 Input PCB assembly 2468CD 24680516B Socket SK3 free 10 way 351510140 Fuse link 1 25A T ceramic 360190320 Socket SK7 free 10 way 351510140 Cable assembly 10 way 24680210A Earth lead 24680216A Socket SK1 free 2 way 351502180 Electrode Cables Sock
60. ever e id electro ctrodes trodes Figure 2 3 Enclosure cable layout for 16 electrode system 2 4 2 3 Connecting the Electrode Cable Assemblies to 2468 Enclosure WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover Four 10 way plugs are provided on each PCB1 to terminate all the necessary connections from the electrode cables 1 Ensure power is removed from electronic enclosure and open the front cover 2 Feed Cables 1 and 2 into the enclosure through its gland if applicable Prepare the cable screens and terminate the screens at the gland plate Screened cables must be used and each one grounded at the cable gland entering the enclosure Use a good quality RF cable gland and ensure a good annual ring shape connection with the screen The screens should not be grounded at the electrode end 3 Prepare the individual conductor lengths to suit their orientation in the terminal blocks PL2 and PL3 on their respective PCB 24680501 as shown in Figure 2 3 It is considered good practice to twist wire pairs together for each electrode circuit and twist the pairs that are in the same cable together into one bundle 2 12 24685034 Hydrastep 2468CB and 2468CD Manual 2468CB amp 2468CD Dual Power Supply Version 2 4 2 4 24685034 Wiring to the hinge side 24680501 board even numbered electrodes should not be pressed hard against the ribbon cables b
61. fault When any of the above mentioned conditions exist within the Hydrastep 2468CB system the yellow LED is illuminated to indicate the FAULT state Since the electrode inputs are split between the two input boards the ALARM indicator is configured to differentiate between ODD and EVEN electrode faults An opto coupler output normally short circuited becomes open circuited on a FAULT state providing an ALARM indication output for external use The current output indicates an alarm condition by a 0 5Hz waveform superimposed on the main analogue signal A further FAULT is indicated when the number of electrodes switch on the display board is set to an invalid number This error brings up an alternate LED illumination display that is a chequered display of GREEN and RED LEDs on the two front panel columns WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover Some parts of the water column and electrodes may be very hot Please ensure parts are adequately cooled or that suitable precautions are taken before handling Indication Fault s Analysis and Corrective Action State 1 Water conductivity Check ac voltage on all electrodes immersed in Top and All LED pairs in water water with a true r m s voltmeter If several of the bottom alternating between immersed electrodes show a voltage of less than halves of water and steam approximately 0 1V ac then very high water faul
62. nylon ART HE washer and M4 nut see inset diagram SPACER 2 Fit the output board on to the spacers and check for correct alignment and adjust if necessary ART OF CB Mounting the Relay Output Board on to the Input Board WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover This task can be performed on a mounted 2468 electronic enclosure or the enclosure can be removed to a bench for the installation Here it is assumed that the enclosure is in its normal working location The procedure for mounting the relay output board is as follows 1 Isolate the power supply from the 2468 electronic enclosure and open the instrument front cover 2 If two output boards are to be fitted make sure that the first output board to be fitted has had its nylon spacers fitted before installation Also ensure the first output board is fully configured before fitting the second output board 3 Ease the pins of the Berg plug PL1 of the output board into the Berg socket SK1 on the input board checking that the mounting holes on the output board the holes which are not contained in white bordered areas are aligned over the fitted spacers and gently press the output board home until the spring loaded spigot on each spacer is locked firmly on to the output board Note When fitting a second output board use the same procedure described
63. open circuit and clean this is the normal setting 0 6uS cm See Figure 2 6 for details 3 If the preferred setting is 1 6uS cm i e low temperature bridge the split pads SP1 amp SP2 with solder SPLIT PADS SP1 2 5 amp 6 LOCATIONS AND SETTINGS E SPLIT PAD 5 5 DD SPLIT PAD SP1 S ATER RESISTIVITY 5 1 n T L6uS CM sel gt 5 amp uS CM NORMAL SPLIT PAD SP2 gt SPLIT PAD SP Figure 2 6 Split pads SP1 5 2 5 5 amp SP6 locations and settings 2 5 2 4 Compatibility Setting The split pads SP5 and SP6 should be open when used with a 24680501C or 24680516B input board When used with a 24680501A 24680501B or 24680516A input boards these split pads should be made With these older input cards the LEDs corresponding to an electrode error will not alternate but remain steady 2 22 24685034 Hydrastep 2468CB and 2468CD Manual 2468CB amp 2468CD Dual Power Supply Version 2 6 FAULT ANALYSIS amp CORRECTIVE ACTION Faults in the system will generally be indicated by the YELLOW LED on the front panel and by the fault output on the display board The main faults which are catered for are e Water above steam condition e Electrode or Wiring fault e Detection of an internal circuit
64. pins 1and 5 and pins 2 and 5 on PL2 An ac voltage is less than 1V indicates a fault on the signal transmission lines Check back to the previous remote display in the daisy chain or to the 2468 electronics unit as appropriate If the correct ac voltages are present at this location then a line break is indicated If the ac voltages are still low then either the lines are short circuited or there is a board fault Disconnect the remote displays upstream and re check the ac voltages If there is a voltage of less than 1Vac at the 2468 electronics unit with PL7 removed then the display board is faulty Remove this board and fit a serviceable item Table 4 1 cont Fault Analysis and Correction Chart 4 14 24685034 Hydrastep 2468CB amp 2468CD Manual Flickering Display Corruption of signal Chequered pattern on red and green LED display Wrong setting of Number of Electrodes switch on 2468 display board On off pattern on red and green LEDs Wrong setting of Number of Electrodes switch on 2468 display board or wrong setting of links LK1 LK2 LK3 and LK4 on the 24683BB decoding pcb Indication not displayed for lower electrodes As above Each electrode represented by only one LED when 16 or less electrodes are used As above LEDs display an irregular red green pattern As above Table 4 1 cont 24685034 Remote Display Options 2
65. row of electrodes is installed in the water level column attached to boiler and typically aligned so that half the electrodes are above and half below the normal water level see Figure 1 2 The resistance measurement is made between the insulated tip of each electrode and the wall of the column The cell constant defining the actual resistance measured is determined by the length and diameter of the electrode tip and the column bore In practice the cell constant is chosen so that the resistance in water is less than 100k ohms and the steam resistance is greater than 10M ohms Since the resistivities of water and steam are substantially different the system is simple and requires no setting up adjustments It is not susceptible to power supply variations ambient temperature changes etc resulting in a highly reliable system A general overview showing how a typical Hydrastep 2468 System is installed is illustrated in Figure 1 3 Introduction to the Hydrastep 2468 Electronic Gauging System Hydrastep 2468CB and 2468CD Manual Figure 1 3 Typical Hydrastep 2468 System Installation 1 4 24685034 Hydrastep 2468CB and 2468CD Manual Introduction to the Hydrastep 2468 Electronic Gauging System 1 2 1 2 1 1 2 2 24685034 HYDRASTEP 2468 ELECTRONIC GAUGING SYSTEM The Hydrastep 2468 is a sophisticated and flexible electronic gauging system It is
66. s voltmeter A voltage of less than 0 1V ac indicates a fault condition If wiring to the electrode is correct and the electrode gives a voltage reading of greater than 0 1V ac and a fault is still indicated carry out the following procedure 1 Remove both conductors from the suspect electrode With the conductors isolated from each other the level display should show the electrode as alternating between water and steam green and red With the conductors touching each other the level display should show electrode as being in steam The above procedure checks the electrode wiring If the display does not show the correct results then check for a break in either of the suspect electrode conductors Carry out repair to any faulty connection or substitute a new conductor or cable assembly in place of the defective item If the wiring checks carried out as described above have not located a fault then dirt on an electrode insulator may be the cause of the problem giving an effective short circuit to ground Check the electrodes for dirt over the external insulator and clean with a cloth as required Checking for dirt on the internal insulator of the electrode requires the draining of the water column refer to Part 2 of this manual for the correct procedure Once the water column is drained check the ac voltage on each electrode using a true r m s voltmeter Any electrode showing a voltage of less than 3V ac needs clea
67. such that density errors in water level indication due to the water temperature in the column being lower than the water temperature in the boiler drum are minimised for the temperatures and pressures specified This is achieved by stimulating condensate flow in the upper part of the column by omitting lagging on the column steam pipe The flow of condensate maintains the temperature of the water column close to that of the boiler drum Caution If a serious blow occurs immediate attention is required Ensure that the column or manifold is VALVED OFF AS SOON AS POSSIBLE otherwise any resulting electrode seat erosion may require the removal of the column or manifold for re machining of the ports Site machining of the water column is possible and satisfactory results can usually be obtained for small leak damage SAFETY PRECAUTIONS N a Ensure that tripping where fitted is disabled and that the operators are briefed to expect erroneous indications or alarms b Ensure that you know the valve positions and other procedures BEFORE working on the water column c Allow the water column to cool before changing electrodes and check for signs of steam at the drain to ensure complete isolation d Wear industrial gloves to change electrodes e On Low level Tripping Schemes either electro mechanical interlocks or recognised procedures MUST be applied to ensure that draining the column does not cause a spurious trip f Refit the elect
68. the nipped electrode condition f Refit the electrical lead s and guard Recommission as stated in section 3 2 WATER COLUMN COMMISSIONING OR RECOMMISSIONING The method given allows the column to fill slowly with condensate from the steam leg through a cracked steam valve and for subsequent warming to continue at a controlled rate as the water is forced back through the cracked water valve Caution DO NOT BLOW WATER COLUMN DOWN a Notify the unit operator of the intention to commission the column in accordance with recognised procedures b Check that the electrode guard is in place C Close the drain valves d Crack open the steam valve Check with the display or the unit operator that the column fills with condensate slowly 10 to 15 minutes e Crack open the water isolating valve Check with the unit operator that the water level is falling 1 to 2 minutes to approximately normal water level and allow to stabilise and heat up for 15 minutes f Open the water valve fully g Open the steam valve fully VENT AND DRAIN VALVE REPAIRS These will usually involve replacement of the gland packing or regrinding of the seat and should follow the normal practice for the particular valve types concerned If itis necessary to replace an entire valve ensure that the new valve is correctly orientated for its sealing direction 24675030 Hydrastep Pressure Parts Fault Repair and Commissioning 3 2 2 3 2 3
69. the interconnection between the electrodes and the electronic enclosure the connection of the ac mains power supply to the electronic enclosure and the analogue output connections from the electronic enclosure Electrode Connections Hydrastep Electrode Cables Special electrode cable assemblies of length 3 10 18 or 30 metres are provided with the system for connecting the Hydrastep 2468 Electronic Enclosure to the Water Column Electrodes The cable looms are 18 core multi strand conductors The conductors are colour coded for ease of installation and have pure nickel ring clamps fitted at one end for connection to the electrodes A set of wire crimps is provided for use on the Enclosure connections The black conductors in each cable are used for the EARTH terminations leaving eight pairs of coloured conductors for connection to the electrodes At least one cable assembly is required and certain conductor pairs in the cables will be redundant The exceptions are the 8 16 and 32 electrode systems where all the conductors in the cables are fully used Electrode connections Function PL2 PL3 PL4 PL5 The connection requirements for the 16 electrode system is used as Electrode Drive the example case A full set of electrode connection diagrams is Electrode Pickup included at the end of Chapter 2 aaa Functional Earth covering the pin by pin pairings for all electrode systems mentioned eE Electrode Drive 280 3 El
70. unit and must be fitted in either LK2 and LK4 to enable the 8 16 electrode mode or LK3 and LK5 to enable the 18 32 electrode mode No of Electrodes used Link Headers fitted 8 16 electrodes LK2 amp LK4 18 32 electrodes LK3 amp LK5 See also Figure 2 5 on page 2 21 PCB INTERCONNECTIONS Signal interconnection between the input boards and the display board is via ribbon cables The power supplies to the display board come from each input board via a 6 core cable Slots are provided in the base plate to guide the cables towards the hinge side of the enclosure case thus minimising any cable strain when the enclosure lid is opened See Figure 2 1 for layout details 2 7 2468CB amp 2468CD Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual 2 4 2 4 1 2 8 INSTALLATION This section deals with the mechanical installation of the electronic enclosure and the electrical connections required for the basic system Any installation dealing with the options available for use on this version of the system are covered in Chapters 3 amp 4 Notes 1 The Electronic Enclosure cover should not be removed or opened until the equipment is ready for physical installation to its fixing point Under no circumstances should the Electronic Enclosure be left open unless internal work is actually in progress 2 When working on a bench with the enclosure open the lid should be supported in its open position 3 cl
71. 034 Hydrastep 2468CB and 2468CD Manual 2468CB amp 2468CD Dual Power Supply Version PART OF DISPLAY BOARD SHOWING LINKS LK1 Note When two input boards are fitted odd electrodes use one input board even ruri electrodes use the other input board and aid a switch SW1 is set to the number of electrodes _ per input board For 18 32 electrodes links LK3 and LK5 must be fitted LFE LRE PLZ LRS LFS For 8 16 electrodes links LK2 and LK4 a 5 must be fitted LR4 PL An invalid switch setting causes the main column LEDs to display a chequered pattern LR e 63 E RL LRE RL LR PLE Stil LK4 tj HEADER LINK OFF LINKS FITTED LINKS FITTED FOR 8 16 FOR 18 32 ELECTRODES ELECTRODES NUMBER OF ELECTRODES Figure 2 5 Location of display board links LK1 to LK5 amp switch SW1 with configuration details 24685034 2 21 2468CB amp 2468CD Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual 2 5 2 3 Switching Threshold Setting WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover 1 Disconnect the power supply Gain access to PCB 24680515 by opening the cover 2 Check split pads SF1 amp SP2 on the PCB are
72. 2 zi gt oo cr amp lt 7 ee MIN ec zz gt 2 Z A x m ga gt an as L 1 ET Al N N N gt ES I lt E lt 3 zi 4 a I X X N x 4 u ccn wat e EAS Lut 02 2 iae La E a X ux Saga WOE gy Wo lt c5 5 Fe ta we wa OLE Figure 2 13 Electrode cable connections to 32 port column 24685034 2 WD 15 Wiring Diagrams for Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual 2 WD 16 24685034 Hydrastep 2468CB and 2468CD Manual Relay Output Board Option 3a 2468 Relay Output Board Option 24685034 3A 1 3A 2 3A 3 3A 4 3A 5 Contents Page No GENERAL DESCRIPTION 3 INSTALLATION 3 3A 2 1 STORAGE amp PRE INSTALLATION 3 22 2 4 1 Storage oo e arii 3 2 1 2 Pre Installation 3 3A 2 2 MECHANICAL INSTALLATION 3 3a 2 2 1 Fitting the Nylon Spacers to the Relay Output Board 4 3a 2 2 2 Mounting the Relay Output Board on to the Input 4 3A 2 3 ELECTRICAL INSTALLATION 5 2 31 PCB 5 3a 2
73. 20 25V dc negative earth or isolated Note Under fault conditions an overvoltage of 30V can be withstood for short periods 60W maximum 7V maximum for non isolated supply Drive to remote display 6 or 8 wire Opto isolated fault output Analogue output 0 20mA or 4 20mA forward or reverse 0 2 6000 at nominal supply voltage 500Q at minimum supply voltage dc 1 1V dc maximum at 1A 1mA maximum at 30V dc 27 maximum 7 maximum 1000m 3280ft maximum Plug in screw terminals 24685034 Hydrastep 2468CB and 2468CD Manual Wiring Diagrams for Dual Power Supply Version 24685034 Figure 2 1 Figure 2 2 Figure 2 3 Figure 2 4 Figure 2 5 Figure 2 6 Figure 2 7 Figure 2 8 Figure 2 9 Figure 2 10 Figure 2 11 Figure 2 12 Figure 2 13 Wiring Diagrams for Dual Power Supply Version Contents Page No Electrode cable connections to 8 port column 2 WD 3 Electrode cable connections to 10 port column 2 WD 4 Electrode cable connections to 12 port column 2 WD 5 Electrode cable connections to 14 port column 2 WD 6 Electrode cable connections to 16 port column 2 WD 7 Electrode cable connections to 18 port column 2 WD 8 Electrode cable connections to 20 port
74. 3a 1 View of relay output board showing switch positions and output pin details 3a 6 Tables Table 3a 1 Electrode selections for relays RL1 to 3a 7 3a 2 24685034 Hydrastep 2468CB and 2468CD Manual Relay Output Board Option 3A 1 3A 2 3A 2 1 3a 2 1 1 3a 2 1 2 2 2 24685034 GENERAL DESCRIPTION The Relay Output Board PCB 24680504 has four relays and is mounted on top of the input board using 3 nylon spacers Electrical connection between the two boards is via plug and socket SK1 on the input board and PL1 on the relay output board A second relay output board may be mounted on top of the first on nylon spacers Holes have been drilled on all relay output boards to receive the 3 nylon spacers The top board is offset towards the centre of the unit improving the cable layout from the relay output boards The nylon spacer fixing holes and mounting holes are illustrated in Figure 3a 1 on page 3a 6 Each of the 4 relays can be energised by any one of up to 16 electrodes with an individual choice of being energised when its selected electrode is in steam or is in water Furthermore relay RL1 can be used to monitor an electrode state or to register an ALARM condition When set to register the ALARM state the relay is energised in the system normal state and de energises when an ALARM condition exists This option comes complete with the nylon spacers
75. 4 Hydrastep Power Supply Cables 2 13 2 4 2 5 Analogue Output Connection 2 15 2 4 2 6 Opto lsolated Fault Output Connection 2 16 SYSTEM CONFIGURATION 2 17 2 5 1 INPUT BOARD PCB 24680501 OR 24680516 2 17 2 5 1 1 Analogue Output Configuration 2 17 2 5 1 2 Pulsed Output Setting 2 18 2 5 1 3 Electrode Error Configuration 2 18 2 5 1 4 Configuring the Unit to Detect Electrode Error 2 19 2 1 2468CB amp 2468CD Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual 2 5 2 DISPLAY BOARD 24680515 sees 2 20 2 5 2 1 Link LK1 Setting 2 20 2 5 2 2 Configuring the Number of Electrodes Switch 2 20 2 5 2 8 Switching Threshold Setting 2 22 2 5 2 4 Compatibility 2 22 2 6 FAULT ANALYSIS amp CORRECTIVE ACTION 2 23 2 6 1 COMPONENT 2 30 2 6 1 1 Removing the Input Board 24680501 or 24680516 2 30 2 6 1 2 Refitting the Input Board
76. 4675030 3 Fault Repair and Commissioning Contents Page No BACKGROUND 3 3 3 1 1 SAFETY PRECAUTIONS zit rrr 3 3 3 1 2 WATER COLUMN ISOLATION dci e e rm beet eos 3 4 3 1 3 ELECTRODE AND ELECTRODE SEAL LEAKS 3 4 3 1 3 1 LOW PRESSURE ELECTRODES 3 4 3 1 3 2 HIGH PRESSURE ELECTRODES II tla sata 3 5 3 1 3 3 TIGHTENING PROCEDURE FOR HIGH PRESSURE ELECTRODE INSTALLATION 3 5 3 1 4 PROCEDURE FOR CHANGING THE LOW PRESSURE ELECTRODES GASKETS ui 3 5 3 1 5 PROCEDURE FOR CHANGING HIGH PRESSURE ELECTRODEG 3 6 WATER COLUMN COMMISSIONING OR RECOMMISSIONING 3 6 3 2 1 VENT AND DRAIN VALVE REPAIRS nennen 3 6 3 2 2 WATER COLUMN TRANSIENT 3 7 3 23 WATER COLUMN _ 3 7 3 2 4 WATER COLUMN 3 7 Note THERE IS NO NEED TO BLOW WATER COLUMN DOWN WHEN COMMISSIONING THE SYSTEM CONTINUOUSLY FLUSHES THE WATER COLUMN 3 1 Fault Repair and Commissioning 3 2 Hydrastep Pressure Parts 24675030 Hydrastep Pressure Parts Fault Repair and Commissioning 3 1 24675030 BACKGROUND With any steam water detection gauge a partial blockage or leak within the pressurised system may result in incorrect water level indication The Hydrastep water column design is
77. 4683B C amp D Analysis and Corrective Action Most probably caused by bad shielding screening of the remote display cabling or by bad shield connections to ground Check shielding and shield connections Ensure that only one end of the cable shield is connected to ground If several remote displays are daisy chained together then a termination resistor may be required on the end display See Section 4 4 3 in this chapter Refer to Section 2 3 in Chapter 2 and ensure that the switch is set correctly If the display still shows a chequered pattern then a circuit fault exists on the 2468 display board Remove this board and fit a serviceable replacement As above If a fault is not found check the link setting on the 24683BB and reset the links if necessary As above As above As above Fault Analysis and Correction Chart 4 15 Remote Display Options 24683B C amp D Hydrastep 2468CB amp 2468CD Manual 4 7 COMPONENT REPLACEMENT Hydrastep remote display units contain no user replaceable electronic components Board failure requires the faulty PCB to be removed and returned for service and a serviceable PCB to be fitted in its place A list of replacement parts is given in Table 4 2 The procedure for replacing a PCB in a remote display is 1 Ensure that Hydrastep 2468 unit is switched off 2 Gain access to the interior of the remote display unit The method depends on the type of remote display
78. 59600802 MAKE SURE THAT THE COMPRESSION GASKET IS REGISTERED IN THE PROBE RECESS PRIOR TO TIGHTENING THE ELECTRODE THIS CENTRES THE GASKET TO THE PROBE GASKET ELECTRODE SEAT SURFACE COLUMN a CORRECT INCORRECT 24675030 Pt 2 5 Pt 2 6 24675030 24675030 NOTICE THE HYDRASTEP VESSEL AND PROBE SYSTEM PROVIDES A SELF FLUSHING FEATURE THAT PREVENTS THE ACCUMULATION OF DEBRIS IN THE VESSEL THIS ELIMINATES THE NEED FOR PERIODIC BLOWING DOWN OF THE VESSEL DO NOT BLOW DOWN THE HYDRASTEP VESSEL IF A BLOCKAGE IS SUSPECTED REFER TO THE APPROPRIATE MANUAL SECTION FOR PROPER DIAGNOSTIC PROCEDURES IF BLOCKAGE PROBLEMS ARE SUSPECTED Pt 2 7 Pt 2 8 24675030 24675030 Part 2 Hydrastep Pressure Parts Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 General Introduction Installation Procedures Fault Repair and Commissioning Unit Description Unit Specifications Hydrastep Pt 2 9 Pt 2 10 24675030 Hydrastep Pressure Parts General Introduction 24675030 1 General Introduction 1 1 PRINCIPLE OF OPERATION treten uio musco te acd naa seco iu J T J 1 3 1 2 WATER LEVEL nennen nennen 1 3 Illustrations Figure 1 1 Schematic of high pressure resistance measuring cell and electrodes 1 3 Figure 1 2 Low pressure water column 120bar 1740
79. 8CB amp 2468CD Manual 3C 2 2 3c 2 2 1 3c 2 2 2 3c 4 MECHANICAL INSTALLATION The output board is mounted directly on top of the input board The input board is supplied with three nylon spacers fitted The output board is then aligned on its Berg socket plug interconnection PL1 SK1 and input board mounted spacers and pressed home on to the spacers Fitting Nylon Spacers to the Opto Isolated Output Board The spacers lit into the holes within the white bordered areas on the output board see Figure 3c 1 on page 3c 6 1 Fit the nylon spacers into their prepared holes on the output board and lock in position using the nylon washer and 4 nut see inset diagram 2 Fit the output board on to the spacers and check for i Hu correct alignment and adjust if necessary ART DF 7 e UL 44 JT Mounting the Opto Isolated Output Board on to the Input Board WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover This task can be performed on a mounted 2468 electronic enclosure or the enclosure can be removed to a bench for the installation Here it is assumed that the enclosure is in its normal working location The procedure for mounting the output board is as follows 1 Isolate the power supply from the 2468 electronic enclosure and open the instrument front cov
80. A amp 7B O indicate the electrode channel selected for each relay A fully functioning system NO FAULTS will cause a low level trip at electrode level 2 Using high level electrode channels and SW5 set to ES the circuit can perform a high level trip Note Inputs from electrodes 1 amp 2 are applied to two separate relays on their respective boards Case A Relays normally energised de energise two to trip Relays shown in de energised state PL2 PL2 RL 1 17 RL 1 1 27 I 3 Ez 2 3 gt To alarm 4 4 annunciator irippi s gt s gt device RL 2 8 212 gt _ ines D EZ E gt E a Even electrodes LH input board Alarm off when contacts closed Odd electrodes RH input board PL3 Switch SW5 is set to EW low level alarms and set to ES for high level alarms Case B Relays normally energised de energise two to trip Relays shown in de energised state To alarm annunciator or tripping device Even electrodes LH input board Alarm off when contacts open Odd electrodes RH input board PL3 Switch SW5 is set to EW for low level alarms and set to ES for high level alarms 3b 16 24685034 Hydrastep 2468CB and 2468CD Manual Delay Relay Output Board Option 3B 4 3B 4 1 38 4 2 24685034 COMPONENT REPLA
81. A or 20 4 To configure the analogue output refer to Table 2 1 then 1 Ensure the power supply is disconnected 2 Locate the position of split pads SP1 and SP2 on the input board PCB 3 Refer to Table 2 1 select which configuration is required and where bridged is ticked bridge the gap on the pad with solder Where open circuit is ticked ensure that any solder bridge on the split pad is removed and the gap is clean 4 Carry out a resistance test across any altered split pad for short circuit or open circuit conditions as appropriate 3 SPLIT OUTPUT Al BRIDGED CIRCUIT ee 214 o 5 a ART OF TEUMA 1 gt UUUUUUUUUUUUUUU 1 m m 0 4 VIEW SHOWIN 5 POSITION OF SPL amp 1 m m Table 2 1 Analogue output configurations 2 17 2468CB amp 2468CD Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual 2 5 1 2 2 5 1 3 2 18 Pulsed Output Setting As configured at the factory the analogue output pulses if a fault condition occurs 1 To disable this feature the split pad SP10 must be broken by cutting the track that passes between the pads 2 Tore enable the pulse for fault conditions the split pad can be bridged with solder Electrode Error Configuration An electrode error is triggere
82. Action SYSTEM OPTIONS OUTPUT BOARDS Each input board can accept one or two output boards that can be used for water level signalling alarm or trip functions Each output board provides four relay outputs or four opto isolated outputs The first output board is fitted directly on top of the input board using three nylon pillars A second output board when required can be fitted on top of the first output board using the same type of fixture The various output boards are described in Chapter 3 REMOTE DISPLAY UNITS Provision is made to drive Remote Display Units The display board is capable of driving up to 6 remote display units Only one of these can be powered by the Hydrastep unit any additional remote displays must be locally powered A remote display unit mimics the display on the Hydrastep 2468 and is as described in Chapter 4 OPTION DETAILS Relay Board 24680504 has 4 fully configurable relay outputs Chapter 3a Relay with Time Delay board 24680509 has 4 fully configurable relay outputs Chapter 3b Opto isolator board 24680505 has 4 fully configurable opto isolated outputs Chapter 3c Remote Display 24683B Panel mounted DIN size 8 to 32 electrode display Chapter 4 Remote Display 24683C Panel mounted large LED 8 to 32 electrode display Chapter 4 9 9v RD M Remote Display 24683D Wall mounted splash proof version of 24683C Chapter 4 24685034 Hydrastep 2468CB and 2468CD Manual Introduction to the Hydrastep 2468 E
83. B and 2468CD Manual Delay Relay Output Board Option 3b 3 1 6 Delay Circuit Configuration By means of split pad links incorporated in each of the relay delay circuits delays can be introduced or bypassed and the following delays are made available see also Figure 3b 2 ELAY SPLIT PAD CONFIGURATION SPS 3 TIME DELAY mom erai lt gt STATE qap lt a 1 gt lt s gt gt gt gt gt cites dn e lt gt lt gt BRIDGED s 2 I gt gt Table 3b 2 Split pad functions on relay delay circuits 24685034 3b 9 Delay Relay Output Board Option Hydrastep 2468CB and 2468CD Manual 3b 3 1 7 Configuring the Delay Circuit Split Pads WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover 1 Isol
84. CEMENT The delay relay board contains no replaceable circuit components failure of the board requires replacement of the entire board The only component that can be replaced is the nylon spacers REPLACEMENT OF NYLON SPACERS WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover The replacement of nylon spacers fitted to the output board requires access to the non component side of the PCB Note Spacers will only be fitted on the output board if a second output board is to be fitted or has been fitted The spacers are secured in their holes by nut and nylon washer To carry out a spacer replacement the output board has to be removed from the input board The procedure adopted is 1 Isolate the 2468 electronic enclosure from the power supply 2 Gain access to the PCBs and undo sufficient connections for the removal of the output board containing the defective spacer 3 Remove the output board s by applying pressure to the upper spring loaded spigots and easing the ART OF output board off its spacers a out of its Berg SPACER plug socket connection FOR 4 Undo the nut and washer securing the faulty spacer and extract it from its hole see inset 7 diagram d m LA 5 Fit the new spacer in position align correctly on 25 4 N the board and secure firmly using the M4 nut and OF N YEON nylon washer UU
85. D 4 4 ELECTRICAL INSTALLATION Up to six remote displays may be driven by the Hydrastep 2468 unit One remote display can be powered from the main unit but all the others must have a local supply A remote display has a dual serial data input and a dual power input When the remote display is powered from the main unit an eight core cable is required to connect the two units When a remote display is locally powered however a six core cable will suffice See the example in Figure 4 4 remote display unit 1 is powered from the main unit and uses an eight core cable remote display unit 2 is locally powered and uses a six core cable All cables must be screened to comply with the EMC directive For remote displays powered from the main unit the loop resistance of the power conductors must be less than 27 ohms for an a c powered unit or 7 ohms for a d c unit To provide for cable runs of up to 1000 metres without the use of heavy cables the main unit and the remote display unit each have internally linked multiple terminals for the power and ground connections This allows the power and ground lines to be doubled to reduce the loop resistance MAY BE OBTAINED SEPARATE CABLES SEE SPECIFI ATI N IF 2 RE CABLES A ARE PREFERREL 4683 REMOTE DISPLAY OPTION
86. E KA ELAN ELAY RELA E 4 3 i I ae 1 LE LI lt y sr MER UU O ET ET ET ET FJ H A le 1 1 L2 PS B I 1 i gd SWITCH Sw L Ux ITCH SHDWN IN THE ace Cd ENERGISE IN ENERGISE IN WATER STATE Ta V L few pre ater Pee Ti ca 4 aere ABC DEF GHIJKLMNOPGRS TUVWXYZ Figure 3b 1 View of relay output board showing switch positions and output details 3b 6 24685034 Hydrastep 2468CB and 2468CD Manual 3B 3 1 DELAY RELAY OUTPUT BOARD 3b 3 1 1 Configuring the Delay Relay Output Board Delay Relay Output Board Option AN WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover 1 Isolate the 2468 electronics enclosure from its power supplies 2 Gain access to the delay relay output PCB and set the relevant switches for the required function 3b 3 1 2 Electrode Relay Selection Relays RL1 RL2 RL3 amp RL4 SW1 to SW4 Four identical switches are provided one for each relay but see SW6 each having four sets of contacts This allows coded selection for one of 16 electrodes for each switch and therefore for each relay in the case of the single input card When dual input cards are fitted odd numbered electrodes feed into one input c
87. EF GHIJKLMNOPQRSTUV 3b 10 24685034 Hydrastep 2468CB and 2468CD Manual Delay Relay Output Board Option 3B 3 2 3b 3 2 1 3b 3 2 2 24685034 ALARM AND TRIPPING FACILITIES The relay boards provide high and low water level alarm and trip facilities for the 2468 Hydrastep system Four to eight relays can be made available for each input board fitted Philosophy A requirement in regulations concerning steam raising plant is the provision of an automatic low water level shut down or trip device In the 2468 Hydrastep the relay output board provides the required output signals for such devices In practical applications of shut down systems two factors must be considered the consequences of spurious trips and the non availability of a trip when required due to protection system faults The following relay output circuits are specific to the 2468 Hydrastep Level Indicator versions Relay Interconnections for Alarm Tripping Systems It is necessary to open the Hydrastep 2468 Electronic Enclosure to carry out any wiring therefore care must be taken when working inside the unit WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover Note Before any relay interconnections are made it is necessary to fulfil any safety regulations governing the plant shutdown procedures Since one input board receives inputs from the odd numbered electrodes and the other in
88. IN J sd I ditur A Lo O Ip i L el N 12 sen ul ENERGISE IN a n Wo t ATE b Eo I A EL REL EL EL B WISE pad al It al 111 1 IEEE od E 11 11 rit Beak adni a G ly i M ss 1 a i Loo c g I d ITCH LI ITCH SHOWN IN THE L 4 ENERGISE IN ey ee STEAM ENERGISE IN WATER STATE 25 guPUPHUS d FUP 5 HA O ES ABC DEF GHIJKLMNOPORSTU 2 Figure 3a 1 View of relay output board showing switch positions and output pin details 3a 6 24685034 Hydrastep 2468CB and 2468CD Manual Relay Output Board Option 3A 3 1 RELAY OUTPUT BOARD 3a 3 1 1 Configuring the Relay Output Board WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover 1 Isolate the 2468 electronics enclosure from its power supplies 2 Gain access to the relay output PCB and set the relevant switches for the required function 3a 3 1 2 Electrode Relay Selection Relays RL1 RL2 RL3 amp RL4 SW1 To SW4 Four identical switches are provided on the relay board for electrode selection Any of the electrodes connected to the input board on which the relay board is mounted
89. LIO OLIO a O 1 nn er cx es _ b mE aa 2 ea ea lt iG iS L 1 abiy o zl e a a gt gt a e Z 1 ER ost Co Dod ry na he 4 gt aL no 24 226 iU N N ax E o 2 15201 edt Sz oa ela i Figure 2 3 Electrode cable connections to 12 port column 24685034 2 WD 5 Wiring Diagrams for Dual Power Supply Version SE ul ZZ wel Z a 4 22 x OUI COST d TIN m d m al E 5 5 SKE in CO LJ m HI l O 3 371 1 ES j Q 3 E 23 rz Sh i i ne s d ddj d THD da i 3 Y 1444444 8 4444444 EH zzi d saz xxm UIN aw 1 52 Be Ll az es N lt p aap dJ aa Y Ne 1
90. NS NEN N N N N do vb pub Woot npo aO ic a p 25 A E 0 e Z 2 2 aa 25 gt gt oo v aia 2 2 2 E A cnc ata oo ma aS Lip zz BE X wat ida m T zd u 2 z u a LE 06 7285 4 a 5 m x 15054 52206 I Zu t x Eg I m LJ bed be Figure 2 9 Electrode cable connections to 24 port column 2 WD 11 REDUNDANT CONNECTORS PL amp GY Wiring Diagrams for Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual E Se ul 25 255 ER EE zs cesa s mare Pi d E 5 5 5 5 21 A j pa NS n d ul T Hu li Hu Hu Hu li 2 9 2dd 2 1 Ud 5 5 5 5 ul 2 4 a c c 5 FoF 5 m Y
91. Operating Manual 24685034 Rev AE June 2011 Hydrastep 2468 Hydrastep 2468CB and 2468CD Electronic Gauging System Dual Power Supply Version amp mobrey EMERSON www mobrey com Process Management GOsgrz pue gogorz 10 pue 5 208992 pue 10 0 lt 89 2 sienuelN 922 suonoes ne puno eq 4 21 BION uono s Z ol 2 q z uonoes Hed o ajay jou pjouseJu L 181 Q IOHS3HH L ONIHO LIMS INV31IS H31VM pL Gz uono s Wed oi EL Gg uonoes Hed 01 gg 5 Z o 2 uonoes Z 0 yBiy 001 s JejeM 128JJ09U uoneuiurejuoo epoJi29 3 Q3 1 YUM 5 051 pue wees p y 5 4 80883 3808153173 p puonoes Wed ees suonoeuuoo y99uO Aeidsip zy uonoes ueq ees e oge se e dsig u
92. RGY LIMITED APPARATUS INCLUDING ALL CABLE 5 CABLE CAPACITANCE AND INDUCTANCE PLUS THE ENERGY LIMITED APPARATUS UNPROTECTED CAPACITANCE Ci AND INDUCTANCE Li MUST NOT EXCEED THE ALLOWED CAPACITANCE Co AND INDUCTANCE Lo INDICATED ON THE ASSOCIATED CERTIFIED APPARATUS FOR THE HAZARDOUS LOCATION 6 THE INDIVIDUAL CIRCUITS SHALL BE SCREENED AS SHOWN 7 CAUTION SUBSTITUTION OF COMPONENTS MAY IMPAIR THE SAFETY OF THIS EQUIPMENT DO NOT OPEN ENCLOSURE WHILE ENERGISED 8 INSTALLATION TO ENSURE MINIMUM ENVIRONMENTAL PROTECTION OF IP54 PROTECTION FROM UV LIGHT AND PROTECTION FROM STATIC CHARGE BUILD UP ON WINDOW CLEAN ONLY WITH A DAMP CLOTH MOBREY LIMITED 2009 THE REPRODUCTION DISTRIBUTION amp UTILISATION OF THIS DOCUMENT AS WELL AS THE COMMUNICATION OF ITS CONTENTS TO OTHERS WITHOUT EXPRESS AUTHORISATION IS PROHIBITED OFFENDERS WILL BE HELD LIABLE FOR THE PAYMENT OF DAMAGES ALL RIGHTS RESERVED IN DIMENSIONS IN MILLIMETRES UNLESS OTHERWISE STATED TOLERANCES UNLESS OTHERWISE SPECIFIED PROJECTION PRINT MAY NOT BE TO SCALE STATED IF IN DOUBT ABOUT DIMENSIONS THEN ASK TO BS8888 A4 AutoCAD SCALE NTS THE EVENT OF GRANT OF PATENT UTILITY MODEL OR DESIGN WHOLE NUMBER DIMN 0 50 1 DECIMAL PLACE DIMN 0 25 4 01 04 09 ST7333 MPC 2 DECIMAL PLACE DIMN 0 10 E ISS DATE CHANGE NOTE NAME ANGULAR DIMN 0 5 MATERIAL FINISH ______ _____ HYDRASTEP CONTROL DRAWING TITLE DRAWN
93. Relay Output Board Option 3A 3 2 3a 3 2 1 3a 3 2 2 24685034 ALARM AND TRIPPING FACILITIES The relay boards provide high and low water level alarm and trip facilities for the 2468 Hydrastep system Four to eight relays can be made available for each input board fitted Philosophy A requirement in regulations concerning steam raising plant is the provision of an automatic low water level shut down or trip device In the 2468 Hydrastep the relay output board provides the required output signals for such devices In practical applications of shut down systems two factors must be considered the consequences of spurious trips and the non availability of a trip when required due to protection system faults The following relay output circuits are specific to the 2468 Hydrastep Electronic Gauging Systems Relay Interconnections for Alarm Tripping Systems It is necessary to open the Hydrastep 2468 Electronic Enclosure to carry out any wiring therefore care must be taken when working inside the unit WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover Note Before any relay interconnections are made it is necessary to fulfil any safety regulations governing the plant shutdown procedures Since one input board receive inputs from the odd numbered electrodes and the other input board receives inputs from the even numbered electrodes interconnections between odd
94. SW5 is set to W for low level alarms and set to S for high level alarms 24685034 3c 13 Opto isolated Output Board Option Hydrastep 2468CB amp 2468CD Manual 3C 4 3C 4 1 3C 4 2 3c 14 COMPONENT REPLACEMENT The components used on the opto isolated output board are fitted using surface mount technology and fault remedial action is by the replacement of the whole output board The only components fitted to the board that the general user can replace are the nylon spacers REPLACEMENT OF NYLON SPACERS The replacement of nylon spacers fitted to the output board requires access to the non component side of the PCB Note Spacers will only be fitted on the output board if a second output board is to be fitted or has been fitted The spacers are secured in their holes by nut and nylon washer To carry out a spacer replacement the output board has to be removed from the input board The procedure adopted is WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover 1 Isolate the 2468 electronic enclosure from the power supply 2 Gain access to the PCBs and undo sufficient connections for the removal of the output board containing the defective spacer gent 3 Remove the output board s by applying pressure to the upper spring loaded spigots and easing the output ee board oft its spacers and out of its Berg plug socket i connection
95. TI H MEC URP i J Si i T rHa T JUTPUT n E E B Pass 6 dg 1 25 4 DILE 5 JN L e 2 E Eis E MAR des n i _ L3 OFF OPTO OUTPU A E n 4 roa 1 1 Ice at 49 E NM CENE ke 13 3 prs bow NM EUM MK ITIN b PEE T edes joe 2 hi n S b h Dead iw it dint ud o pond el perl M b o 27 1 11 I ene ZZZZZM hd o _ 124 Ge SA Lee SOD pna 2 KEN 2 EH ae Resa ane oy en JL Zuma ast ABCDEFGHIJKLMNOPQRST 1 e 3 4 APTION NYLON SPACER DJNTING HOLE NYLON SPACER FIXTURE HOLES FOR SEC OUTPUT BOARD DIRECTION FO FAULT SIGNAL OPERATION z 9 SWIT SWITCH ELECTRODE 7 H s SHO IN IT S OSITION OPTO OUTPUT CHANNEL Figure 3c 1 View of opto isolated board showing switch positions and output details 3c 6 24685034 Hydrastep 2468CB amp 2468CD Manual Opto isolated Output Board Option 3C 3 1 CONFIGURING THE OPTO ISOLATED OUTPUT BOARD WARNING Mains voltages are present in
96. X PRESSURE BAR MAX TEMPERATURE CC RELAY PCB PL2 PL3 MAXIMUM INPUT VOLTAGE Ui MAXIMUM INPUT CURRENT li INTERNAL CAPACITANCE Ci INTERNAL INDUCTANCE Li 246781A MAXIMUM POWER INPUT Pi MAXIMUM INPUT VOLTAGE Ui MAXIMUM INPUT CURRENT li CERTIFIED PRODUCT ALTERATIONS TO THIS DOCUMENT MUST INTERNAL CAPACITANCE Gi BE APPROVED BEFORE IMPLEMENTATION INTERNAL INDUCTANCE Li MAXIMUM POWER INPUT Pi NOTES 1 INSTALLATION OF EQUIPMENT INCLUDING ANY GROUNDING ARRANGEMENT TO BE IN ACCORDANCE WITH CANADIAN ELECTRICAL CODE RECOMMENDED PRACTICE FOR INSTALLATION OF ENERGY LIMITED CIRCUITS OR THE ENERGY LIMITED EQUIPMENT INSTALLATION PRACTICE IN THE COUNTRY OF USE 2 THE APPARATUS SHALL BE PROTECTED BY A DEVICE THAT WILL ENSURE THAT IT IS NOT SUBJECTED TO VOLTAGE TRANSIENTS THAT EXCEED 40 OF THE NOMINAL SUPPLY VOLTAGE IT SHALL NOT BE CONNECTED TO BRANCH CIRCUITS GREATER THAN 15A 3 ANY ASSOCIATED CERTIFIED EQUIPMENT WITH ENERGY LIMITED OUTPUT WHOSE ENTITY CONCEPT PARAMETERS MEET THE REQUIREMENTS OF TABLE 1 4 THE ENTITY CONCEPT ALLOWS INTERCONNECTION OF ENERGY LIMITED APPARATUS NOT SPECIFICALLY EXAMINED IN COMBINATION AS A SYSTEM WHEN THE APPROVED VALUES OF Uo AND lo OF THE ASSOCIATED CERTIFIED APPARATUS ARE LESS THAN OR EQUAL TO Ui AND OF THE ENERGY LIMITED APPARATUS AND THE APPROVED VALUES OF Co AND Lo OF THE ASSOCIATED CERTIFIED APPARATUS ARE GREATER THAN THE TOTAL VALUES Ci AND Li OF ALL THE ENE
97. alf of fault Power present but Check that the wiring to connector PL1 in the remote LED illuminated and loss of serial data display unit is correct odd LEDs flashing at If wiring i 1 d as foll 1Hz or odd LEDs off wiring is correct proceed as follows 1 If a termination resistor is fitted disconnect this from the end of the daisy chain With an ac voltmeter check the ac voltage between pins 1and 5 and pins 2 and 5 on PL 1 An ac voltage is less than 1V indicates a fault on the signal transmission lines Check back to the previous remote display in the daisy chain or to the 2468 electronics unit as appropriate If the correct ac voltages are present at this location then a line break is indicated If the ac voltages are still low then either the lines are short circuited or there is a board fault Disconnect the remote displays upstream and re check the ac voltages If there is a voltage of less than 1Vac at the 2468 electronics unit with PL3 removed then the display board is faulty Remove this board and fit a serviceable item Bottom half of fault Power present but Check that the wiring to connector PL2 in the remote LED illuminated and loss of serial data display unit is correct even LEDs flashing at 1Hz or even LEDs off If wiring is correct proceed as follows 1 If a termination resistor is fitted disconnect this from the end of the daisy chain With an ac voltmeter check the ac voltage between
98. and even relay boards will be required The following are examples of relay configurations used 3a 9 Relay Output Board Option 3a 3 2 3 One out of Two Relay Alarm System Hydrastep 2468CB and 2468CD Manual Either of the relays involved can cause an alarm when their assigned electrode registers an alarm condition The alarm condition is selected by switch SW5 to provide relay energisation in water EW or energisation in steam ES Case A Relays normally energised de energise either one to trip Relays shown in de energised state Odd electrodes RH input board RL1 Odd electrodes RH input board To alarm annunciator Alarm off when contacts closed PL 2 PL2 To alarm annunciator Alarm off when contacts open Even electrodes LH input board RL1 Even electrodes LH input board Switch SW5 is set to ES for low level alarms and set to EW for high level alarms Case B Relays normally de energised energise either one to trip Relays shown in de energised state RL1 52 RL 1 Le Odd electrodes RH input board To alarm annunciator Alarm off when contacts closed PL2 PL2 To alarm annunciator 4 4
99. and two 8 way output sockets INSTALLATION This sub section deals with the mechanical and electrical installation of the Relay Output Board PCB 24680504 option In the rest of this chapter the relay output board title is shortened to relay board STORAGE amp PRE INSTALLATION INSPECTION Storage Area The storage area must be dry dust free and kept at a reasonable temperature The storage area should allow for access and inspection of all items of equipment Pre Installation Inspection Open the option package and inspect the contents for signs of damage Check contents for completeness MECHANICAL INSTALLATION The output board is mounted directly on top of the input board The input board is supplied with three nylon spacers fitted The output board is then aligned on its Berg socket plug interconnection PL1 SK1 and input board mounted spacers and pressed home on to the spacers When two output boards are required to be mounted on an input board the second output board is mounted on three nylon spacers fitted on the first mounted output board 3a 3 Relay Output Board Option Hydrastep 2468CB and 2468CD Manual 3a 2 2 1 3a 2 2 2 3a 4 Fitting the Nylon Spacers to the Relay Output Board The spacers fit into the holes within the white bordered areas on the output board see Figure 3a 1 on page 3a 6 1 Fit the nylon spacers into their prepared holes on 2 the output board and lock in position using the
100. annel identity and the switch electrode state 3c 3 1 4 System Fault Output Opto 1 on each opto isolated board can be configured to be a system fault opto isolated output by setting SW6 When used as a system fault opto isolated output the normal state of Opto 1 is low resistance and a fault state will cause Opto 1 to go into its high resistance state Opto 1 will only output faults detected by the input board onto which it is installed With a dual power supply Hydrastep unit this means it is necessary to used two opto isolated output boards one on each input board to create a system fault output To alarm annunciator or tripping device PL2 VE VE PL2 Opto output 1 Opto output 2 Odd Electrodes Even Electrodes RH Input Board Note External power must LH Input Board be applied as shown See specification for power requirements Switch SW6 set for Fault Signal operation Note Systems with a local display have an opto isolated system fault available from the display board 3c 8 24685034 Hydrastep 2468CB amp 2468CD Manual Opto isolated Output Board Option 3C 3 2 3c 3 2 1 3c 3 2 2 24685034 ALARM AND TRIPPING FACILITIES The output boards provide high and low water level alarm and trip facilities for the 2468 Hydrastep system Four to eight opto isolated outputs can be made available for each input board fitted Philosophy A requirement in regulation
101. ard with the even numbered electrodes being fed into the other input card Each input card then offers any mounted relay output card the choice from its electrode inputs with the resultant selectivity as shown in Table 3b 1 Switch SW1 5W2 5W3 or 5W4 Settings for Electrode Selection RL1 to RL4 respectively Switch Contacts BEH ot of or o ot Oo of or of Oo o ot o Oo of or or ot o S On or of OO 5 X X Two Input Cards Odd I P Card Even I P Card One Input Card 5 gt 5 5 Table 3b 1 Electrode selections for relays RL1 to RL4 Example Single Input Board Electrode 13 selected A UA Dual Input Boards Odd input board Electrode 25 selected im Even input board Electrode 26 selected OFF 24685034 3b 7 Delay Relay Output Board Option Hydrastep 2468CB and 2468CD Manual 3b 3 1 3 Relay Energisation In Steam or In Water SW5 This is a four channel switch one channel allocated per relay The choice presented by each channel switch is whether the relay is energised when the particular electrode is in water or energised when that electrode is in steam This switch is highlighted in Figure 3b 1 on page 3b 6 to provide additional
102. astep 2468 Electronic Gauging System its mechanical installation system configuration simple fault analysis corrective action capability and its specification 2 2 ELECTRODE CABLING SYSTEM This system can have 8 10 12 14 16 18 20 22 24 26 28 30 or 32 electrodes and uses 18 core electrode cables The cables consist of nine pairs of coloured cores with the black cores in each cable used for the EARTH terminations Each electrode requires one pair of cores one core for the signal drive and one for the signal return Number of Number of Cables Electrodes Required The electrode cable is pre formed for simple installation The connections to the electrodes are terminated on the connection stud of the electrode Either core can be connected to the electronic enclosure as the signal drive or return 2 3 ELECTRONIC ENCLOSURE The basic arrangement of boards in the electronic enclosure is as follows e Two input boards supply power to the system and to the input signal processing circuits These boards are PCB 24680501 ac mains input or PCB 24680516 dc input One board is mounted on the right hand side of the base plate and receives the odd numbered electrode inputs The other board is mounted on the left hand side of the base plate and receives the even numbered electrode inputs e A display board PCB 24680515 contains the LED drive circuits for the two columns 32 red LEDs and 32 green LEDs and the system fault LEDs This
103. ate the 2468 electronics enclosure from its power supplies 2 Split pad bridging may be carried out in situ however it may be easier to remove the board from the unit Gain access to the delay relay output PCB and bridge the required split pads see Table 3b 2 and Figure 3b 2 with solder ensuring that the remaining split pads are open circuit and clean 3 Note When two output boards are fitted the upper board will have to be removed temporarily to give access to the split pads of the lower output board 4 Carry out any necessary re assembly on the output board s and test that the required delay on the relay operations is being achieved 5 If no further work is required inside the enclosure close and secure the enclosure lid Figure 3b 2 View of delay relay output board showing split pad positions
104. being serviced For a 24683B Remove the cables from terminal block TB1 at the rear of the unit Remove the clamps Withdraw the unit from the front of the mounting panel and lay on a clean surface Pull off the bezel from the unit front panel unscrew and remove the side panel and lift off the front and rear panels and use a suitable flat bladed screwdriver to prise apart the PCB interconnecting edge connectors Both PCBs can now be removed from their securing slots in the unit case For a 24683C Remove the cables from terminal block TB1 at the rear of the unit Remove the clamps Withdraw the unit from the front of the mounting panel and lay on a clean surface Remove the front and rear panels Both PCBs can now be removed from the unit case For a 24683D Remove the unit clear cover and the front panel The LED display and the decode PCB can now be accessed and it can easily be seen which screws and connections it is necessary to remove in order to remove the faulty board s 3 Fitthe serviceable PCB s following the reverse order to that given in step 2 Mobrey Part Number For 24683B LED PCB assembly 24680514A Decode PCB assembly 24680513B Header for 8 16 18 32 electrode operation 399100390 Holding bar two off with two knurled knobs 460202260 For 24683C LED PCB assembly 24680519A Decode PCB assembly 24680520A Header for 8 16 18 32 electrode operation 460202260 For 24683D LED PCB assembly 24680521A Decode PCB ass
105. below A socket LK1 situated near switch SW1 is provided to link the two halves of the display board together with a link header when only one input board is used In this case when two input boards are being used the link header is not fitted Sockets are also provided at LK2 LK3 LK4 and LK5 locations see Figure 2 5 to select an 8 16 two LEDs per electrode display mode or an 18 32 one LED per electrode display mode For hazardous area applications links 2 3 4 and 5 when fitted must be secured into the sockets using a cable tie passed underneath the socket base CHANNEL NO IN WATER PER INPUT LINKS LINKS COLUMN BOARD 2 amp 4 3 amp 5 Em Lo I Or miss o p E Fitted o on Fitted on on On on Of pa Ot d p or i ER TD of Not Fitted Fitted Table 2 2 Number of electrodes being displayed Link LK1 Setting Ensure that link header LK1 is not fitted see Figure 2 5 Configuring the Number of Electrodes Switch WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover 1 Disconnect the power supply Gain access to PCB 24680515 by opening the cover 2 Locate position of Number of Electrodes switch SW1 see Figure 2 5 3 Depending upon the number of electrodes being used set the switches as defined in Table 2 2 The switch positions in the example shown are for a twelve electrode system 24685
106. bles close to the metalwork and away from the PCB Connect the live and neutral conductor to their respective terminals Check the voltage setting by checking which voltage selection plug is fitted set to 240V at the factory and if required adjust as guided in Figure 2 4 2 13 2468CB amp 2468CD Dual Power Supply Version 2 14 Hydrastep 2468CB and 2468CD Manual 6 With power disconnected release voltage selection plug PL9 by squeezing lugs Insert appropriate selector plug 7 Remove fuse and fit 200mA ceramic anti surge fuse for 240Vac nominal and 400mA ceramic anti surge fuse for 110Vac nominal The Hydrastep 2468C unit must be earthed via the protective earth terminal stud on the enclosure The cable or braid used to attach the unit to the protective earth must be capable of carrying a current of at least 10A No disconnecting device should be fitted to the protective earth conductor Voltage Selection Plug Voltage Selection Plug Set to 240V Set to 110V Fuse J r gt d _ Sue AN e UT CM DA 240V 110V Figure 2 4 Voltage Selection 240V 1107 DC Powered Units input board 24680516 A shielded power cable and shielded signal cables with the connection to the unit through RF glands mounted
107. bottom half of the Fault LED illuminates when faults are detected by the right hand input board the odd electrodes Faults are covered under Fault Analysis amp Corrective Action in section 2 4 of this chapter The switch that sets the number of electrodes to be scanned is also mounted on this board A chequered pattern is displayed by the RED and GREEN columns if an invalid switch setting is made on the number of electrodes switch The water steam switching threshold 0 6uS cm or 1 6uS cm may be changed by solder split pads Link LK1 The display board caters for both single input board and dual input boards versions of the Hydrastep 2468 system With dual input boards the odd electrode inputs are connected to one half of the display board circuit with the even electrode inputs connected to the other half of the circuit With the single input board only one half of the board is connected to the odd and even electrode inputs In this case the link LK1 must be fitted to connect the odd and even halves of the display board circuit Note This link MUST be removed for the dual input board system 24685034 Hydrastep 2468CB and 2468CD Manual 2468CB amp 2468CD Dual Power Supply Version 2 3 3 2 2 3 4 24685034 Links LK2 LK3 LK4 and LK5 These links are used to select either the 8 16 display mode two LEDs per electrode or the 18 32 display mode one LED per electrode Two link headers are provided with the
108. circuit components failure of the board requires replacement of the entire board The only component that can be replaced is the nylon spacer 3A 4 1 REPLACEMENT OF NYLON SPACERS The replacement of nylon spacers fitted to the output board requires access to the non component side of the PCB Note Spacers will only be fitted on the output board if a second output board is to be fitted or has been fitted The spacers are secured in their holes by nut and nylon washer To carry out a spacer replacement the output board has to be removed from the input board The procedure adopted is WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover 1 Isolate the 2468 electronic enclosure from the power supply 2 Gain access to the PCBs and undo sufficient connections for the removal of the output board containing the defective spacer 3 Remove the output board s by applying pressure to the upper spring loaded spigots and easing the output board off its spacers and out of its Berg plug socket connection 4 Undo the nut and washer securing the faulty L spacer and extract it from its hole see inset diagram ZE MA CART OF SPACER 5 Fit the new spacer in position align correctly on the board and secure firmly using the M4 nut and ART OF nylon washer d 6 Refit the PCB s into the enclosure re connect the PCB s as re
109. column either up to NWL or for it s full length depending on the ambient conditions prevailing at the site Suitable lagging part number 450601450 is available from Mobrey When the installation of the water column has been completed precautions must be taken to protect it against damage during the installation of adjacent plant and pipework Note Particular attention must be paid to the protection of the electrode sealing surfaces in the column against foreign bodies or weathering For this purpose the following sealing plugs should be fitted as appropriate L P Sealing Plug Part No 24569A Series 3 Sealing Plug Part No 450600880 Caution If there is any possibility of the ambient temperature at drum level falling below zero C for any period when the boiler is not operational itis ESSENTIAL that the water column is isolated drained and vented to prevent ice expansion damage to the electrodes in the column Ice expansion damage can also affect adjacent valves For instructions regarding the assembly of electrodes in the water column see Chapter 3 sub section 3 1 4 low pressure electrodes and 3 1 5 high pressure electrodes INSPECTION OF MECHANICAL INSTALLATION WORK When the mechanical installation work has been completed the site surveillance staff may be required to inspect the work and the equipment such as the installation of the electronics unit and the installation of the water column checking particularly the level re
110. cool and a re filling of the water column would indicate a pressure condition Alternatively carefully unscrew the first electrode and look out for the presence of steam Warning Great care is required during the check on the first electrode Where a separate atmospheric drain is used open the drain valve and leave it open d Proceed with the work required ELECTRODE AND ELECTRODE SEAL LEAKS The distinction between electrode insert seal and electrode insulator leaks is often difficult to determine prior to removal of the electrode unless the leak is small Steam wisps which appear to come from between the outside of the electrode body and the gasket indicate a seal leak steam appearing through the external ceramic insulator suggests that the electrode itself is faulty Even if the electrode is in water the water temperature in an operating system will cause the water to flash off to steam as atmospheric conditions are reached Caution not attempt to cure a leaking seal on a low pressure electrode by overtightening the electrode clamping nut The most probable fault for low pressure electrodes lies in damage to the sealing washer The correct degree of compression on this washer is inherent in its design Tightening beyond this point will only cause damage to the electrode or to the water column Low Pressure Electrodes The correct procedure on low pressure electrodes for repairing either a seal or an electrode failure is to remov
111. d if the electrode resistance measured falls below the set electrode error threshold Possible causes are a short to ground short in cabling or dirty electrode or a break in the electrode wire may also be very conductive water This unit can either be configured to take electrode error into account when measuring electrode resistance or the facility can be disabled When enabled if an electrode error occurs the alarm yellow LED relating to the board on which the error occurred is illuminated and the LED pair red and green corresponding to the electrode alternate between red and green ELECTRODE ERROR THRESHOLD 1 NIIRMAL HIGH CONDUCTIVITY Clie SABLET esse JISABLED ee lt gt Note If SP6 has been bridged this may be left in position even if SP7 is subsequently bridged OPTION BOARD MOUNTI ILLA ooj 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ooo 0000000000 5 0 0 0 8 0o00 0 1 Ss 2 x Input Board Option Board Removed 24685034 Hydrastep 2468CB and 2468CD Manual 2 5 1 4 Configuring the Unit to Detect Electrode Error 24685034 2468CB amp 2468CD Dual Power Supply Version is connected De energise before opening front cover WARNING Mains voltages are present in
112. drastep 2468 contains no user replaceable components Board failure requires the replacement of the entire printed circuit board WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover Removing the Input Board 24680501 or 24680516 The input board is secured on to the base plate of the electronic enclosure by seven set screws and washers distributed one at each corner of the board and three in the board centre See Figure 2 1 To remove the input board carry out the following procedure 1 Isolate the electronic enclosure from the ac mains or dc supply and open the lid 2 Unplug the supply connector TB1 3 Unplug the electrode input connectors PL2 3 4 and 5 as necessary and the analogue output connector PL1 if used from the input board 4 Disconnect the ribbon cable connector on the display board and the display board power cable socket on the input board see Figure 2 1 on page 2 4 5 Undo the seven securing screws and remove them and their washers Lift off the input board from the base plate Refitting the Input Board To refit the input board carry out the removal procedure in the reverse order Removing the Display Board 24680515 The display board is attached to pillars mounted on the rear of the front panel by five securing nuts and washers See Figure 2 1 on page 2 4 To remove the display board carry out the following procedure 1 Isolate the
113. ds are fitted the output terminals of the uppermost output board are offset towards the centre of the input board ECONI OUTPUT gt BOARD 2 1 A SE is kes jp ie Sty 5 1 FIRST 491 See tr 2 OUTPUT ie LG 1 BOARI 6 Mie Y aa lt A RL 7 L 1456 p E 7 A T EE ART DF Co amp c 64 e LEa RELAYS SHO DE ENERGISED View illustrating mounted positions of dual Relay output PCB delay relay output boards connectors 3b 5 Delay Relay Output Board Option Hydrastep 2468CB and 2468CD Manual 3B 3 DELAY RELAY BOARD CONFIGURATION The 24680509 Delay Relay Output Board has three configuration switches and twenty split pad links for delay time selection The switches are e 5 6 Selects Electrode or Alarm state for RL1 e SW1 SW4 Selects individual electrode for relays RL1 to e 5 5 Selects RL1 to be energised in steam or in water Figure 3b 1 provides a view of the output board layout to highlight the positions of the various configuration switches NYLON SPACER QUNTING HOLE
114. e maximum allowable and the tightening torque used must be the minimum to achieve this Failure to comply with this limitation may cause damage to the port or to the electrode due to over tightening If necessary where the sealing surfaces can be recovered by simple cleaning practices the old electrode can be refitted and tightened to within the maximum torque value given and the system pressure tested However it is recommended that the best solution to minimise the system down time is to fit a new electrode Where scoring or erosion of the sealing seat has occurred in the water column port this can be re cut to acceptable standards using the Service Tool 246791AA or 246722AA see above PROCEDURE FOR CHANGING THE LOW PRESSURE ELECTRODES AND GASKETS Carry out the isolation procedure as detailed in sub section 3 1 2 Ensure that the tripping is disabled see Safety Precautions sub section 3 1 1 There is no need to switch off the Hydrastep electronic equipment then a Remove the electrode cover guard taking care to avoid knocking the electrodes Note Remove only one electrode at a time avoids risk of incorrect reconnection b Disconnect the leads extract the electrode and the gasket carefully without damage to the seat face C Inspect the column seat making sure that it is free of loose particles and is not pitted or corroded d Carefully unpack the new electrode and check that there is no damage to the ceramic insu
115. e the knurled nut s and disconnect the electrode lead s Next remove the electrode complete with its sealing washer from the column A thorough examination of the electrode and washer is likely to give a more positive identification of the cause of the leak However unless it can be definitely established that the electrode was not at fault it is advisable to fit a new electrode at this stage To assist in identifying a seal leak this may be caused by a Failure to remove the old washer on a previous occasion before inserting the replacement washer and electrode b Re using an old and already compressed washer instead of a new one c Failing to ensure that the land and the recess in the electrode port were clean and undistorted at the last inspection Note When installing low pressure electrodes ensure that the threads in the electrode port are free of loose particles Lightly coat the electrode threads with anti seize compound Part No 830007220 Insert the electrode ensuring that the new gasket is centred in the electrode groove and tighten the electrode with a torque wrench to 40 55Nm After 15 minutes re tighten the electrode with the torque wrench set to 40 Ibft 55 The maximum torque is 50 Ibft 68Nm so DO OVERTIGHTEN 24675030 Hydrastep Pressure Parts Fault Repair and Commissioning 3 1 3 2 3 1 3 3 24675030 Where scoring or erosion of the electrode port seat has occurred in the water column
116. ean the instrument use a damp cloth with a mild water based cleaner Clean the exterior of the instrument only Do not allow liquids to enter or spill into the instrument MECHANICAL INSTALLATION The electronic enclosure must be sited within electrode cable length of the water column fixture The preferred site for the electronic enclosure is a wall or vertical bracket structure where easy access is available for viewing and servicing and of suitable composition load bearing ability to be capable of supporting 4 times the equipment weight See page 2 32 for weight specification It is assumed that the water column is fully installed The electronic enclosure is equipped with four welded feet allowing it to be secured in a vertical position Using a template derived from the enclosure details given in Figure 2 2 drill the necessary holes in the prepared surface Secure the electronic enclosure with M10 bolts or equivalent fixings The wiring enters the unit through a gland plate in the bottom of the enclosure A blank gland plate is provided to give users a choice in the type of glands and gland configuration for the required system Alternatively cable entry can be made directly via trunking Note that the gland plate should be removed for fitting of the glands EMC compatibility for European installations is proven for an enclosure using a gland plate and RF glands making a good annular ring shape connection to screened cables for all conn
117. eck the voltage between pins 5 and 8 of PL3 If the voltage is less than 18Vdc then the display board in the 2468 electronics unit may be faulty Replace this board with a serviceable item and check for the correct voltage between pins 5 and 8 of PL3 No display of even Loss of power to Check that the wiring to connector PL2 in the remote LEDs including top half remote display unit display unit is correct of fault LED With a suitable meter check that the supply voltage is present at the remote display unit connector Ensure that the voltage is in the range 14V through 45Vdc If the unit is locally powered and no voltage is present check the voltage at the local power source If the unit is powered from the 2468 electronics unit check the voltage between pins 5 and 8 of PL7 on the display board 24680502 of that unit A voltage of less than 14Vdc indicates the possibility of a short circuit in the power lines or a fault on the display board Disconnect connector SK3 from the display PCB in the 2468 electronics unit and re check the voltage between pins 5 and 8 of PL7 If the voltage is less than 18Vdc then the display board in the 2468 electronics unit may be faulty Replace this board with a serviceable item and check for the correct voltage between pins 5 and 8 of PL7 Table 4 1 Fault Analysis and Correction Chart 24685034 4 13 Remote Display Options 24683B C amp D Hydrastep 2468CB amp 2468CD Manual Bottom h
118. ections An installation using unscreened cables or trunked routing without a gland plate and RF gland would not be covered by the manufacturer s EMC declaration of conformity The cabling involved is e Mains Supplies 2 cables e Remote Display up to 6 cables e Electrode Inputs up to 4 cables e Analogue Outputs 1 or 2 cables e Relay or Opto isolated Outputs e Opto isolated Fault Output 1 cable Up to 16 relay or opto isolated outputs 24685034 Hydrastep 2468CB and 2468CD Manual 2468CB amp 2468CD Dual Power Supply Version ul I gt 5 3 ds a J El I 2 F 2 bpm 227 E mtn old i lt 1 1 A 1 E 02 gt 0 Y m Y E gt L NOTES ole EIGHT 11k E 2 IP RATING IP65 NEMA 4X Hes 5 MATERIAL THICKNESS BETWEEN Eu ABLE GLAND HOLES MUST ape M BE 9mm MINIMUM Se 4 ENCLOSURE BRUSHED ST STL Se Figure 2 2 Installation diagram for Hydrastep 2468 Electronic Gauging System unit 24685034 2 9 2468CB amp 2468CD Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual 2 4 2 2 4 2 1 2 10 ELECTRICAL INSTALLATION This section deals with
119. ectrode Pickup 6 Electrode Drive Electrode Pickup Functional Earth Electrode Drive Electrode Pickup 24685034 Hydrastep 2468CB and 2468CD Manual 2468CB amp 2468CD Dual Power Supply Version 2 4 2 2 Connecting Cables to Water Column Electrodes 16 Electrode System See Page 2 WD 7 The following assumes that the electrodes have been fitted to the water column 1 Gain access to the electrodes mounted on the water column 2 Undo both knurled nuts on the stud of the bottom electrode referenced EL 1 on the drawings and remove both the nuts and washers 3 Take one of the brown BN conductors in Cable 1 and fit the ring clamp of the conductor over the stud followed by a washer and a knurled nut Tighten the nut to form a good secure contact ensuring the conductor run to the cableform clamping bar is free from snags and sharp bends 4 Repeat the operation for the remaining brown BN conductor of Cable 1 5 Take the next electrode up referenced EL 2 on the drawings and repeat the operations detailed in paragraph 2 above 6 Take the brown BN conductors of Cable 2 and repeat the fitting instructions detailed in paragraph 3 above 7 Repeat the operations of paragraphs 2 and 3 for the remaining tabulated conductor electrode pairings on the next page and connect as detailed on page 2 WD 7 8 Check that all conductor runs affecting Cables 1 and 2 on the wa
120. embly 24680522A Header for 8 16 18 32 electrode operation 460202260 Table 4 2 Remote Display Replacement Parts 4 16 24685034 Hydrastep 2468CB amp 2468CD Manual Remote Display Options 24683B C amp D 4 8 SPECIFICATION REMOTE DISPLAY UNITS INDICATION Red green 6mmx3mm LEDs CASE STYLE 24683B and 24683C Panel mounting 24683D Rugged enclosure to IP65 NEMA 4X DIMENSIONS 24683B 144 72 200 deep 5 67 x2 83 x7 87 24683C 192mmx96mmx209mm deep 7 56 x3 7 x8 23 24683D 302mmx186mmx175mm deep 11 89 x7 32 x6 89 PANEL CUT OUT 24683B 139mmx67mm 24683C 186m mx92mm 7 32 x3 62 POWER SUPPLY Derived from 2468 electronics unit or 20V 54Vdc 240mA Absolute maximum limits at remote display terminals 16V to 60Vdc TERMINALS Screw clamp CABLES Note The following cables fulfil the minimum requirements Heavier cables may be used Maximum gauge accepted by connectors is 16AWG 1 5mm Powered from 2468 electronics 1 5mm 7x0 53mm individually shielded 5 pair Overall up to 1000m from 2468 unit shield Galvanised steel wire armour One cable BASEEFA conformity required Mobrey Part No 480121230 Unit locally powered 22 AWG 0 324 7x0 25mm individually shielded 2 pair up to 1000m from main unit twisted Belden type No 8723 Two cables required 22 AWG 0 324mm 7x0 25mm individually shielded 3 pair twisted Belden type No 8777 One cable required Powered from 2468 electr
121. er 2 If two output boards are to be fitted make sure that the first output board to be fitted has had its nylon spacers fitted before installation Also ensure the first output board is fully configured before fitting the second output board 3 Ease the pins of the Berg plug PL1 of the output board into the Berg socket SK1 on the input board checking that the mounting holes on the output board the holes which are not contained in white bordered areas are aligned over the fitted spacers and gently press the output board home until the spring loaded spigot on each spacer is locked firmly on to the output board Note When fitting a second output board use the same procedure described in operation 3 but refer to the components etc on the mounted output board This concludes the mechanical installation of the output board s and should be followed by the electrical installation If the latter is not to be carried out in the immediate future then the power supply can be reconnected 24685034 Hydrastep 2468CB amp 2468CD Manual Opto isolated Output Board Option 3C 2 3 ELECTRICAL INSTALLATION 3c 2 3 1 PCB Interconnections Signal interconnection between the input board PCB 1 and the output board PCB 5 is direct via the SK1 PL1 12 way Berg connectors Similarly interconnection between the dual mounted output boards uses the same type connectors but the top board s plug PL 1 engages in the first output board s socket SK1
122. et SK2 free 10 way 351510140 Electrode cable 3 metre 24680204A Socket SK3 free 10 way 351510140 Electrode cable 10 metre 24680205A Socket SK4 free 10 way 351510140 Electrode cable 18 metre 24680206A Socket SK5 free 10 way 351510140 Electrode cable 30 metre 24680207A Input Adapter Board 24680523A 2 31 2468CB amp 2468CD Dual Power Supply Version 2 7 2 32 SPECIFICATION Enclosure Weight of unit Operating temperature Relative humidity Location Power supply requirements ac input Power supply loading ac Power supply requirements dc input Power supply loading dc Supply Vs to plant ground Installation category Outputs Analogue output Range Accuracy Drive capability Opto isolated fault output Maximum open circuit voltage Maximum short circuit current Short circuit voltage drop Open circuit leakage current Remote display drive Loop Resistance ac powered unit Loop Resistance dc powered unit Distance Electrical connections Hydrastep 2468CB and 2468CD Manual 425mm x 325mm x 163mm 16 7in x 12 8in x 6 4in Brushed stainless steel Wall mounting IP65 NEMA4X Gland plate stainless steel 250mm x 120mm 9 8in x 4 7in 12kg 26 416 20 C to 70 C 4 F to 158 F up to 100 Indoor or outdoor 115V ac nominal 93 5V 130V 48Hz 65Hz 240V ac nominal 187V 256V 48Hz 65Hz 60VA maximum 24V dc nominal
123. fault exists The circuit fault may be on either input board or the display board If spares are available change the input board first and if the fault is not rectified change the display board If spares are not available call the service engineer This state is indicating a fault which is not related to an electrode error because no LED pairs are alternating between water and steam It is therefore likely that an internal fault exists Follow same procedure as above Check that all even numbered electrodes indicating water have the correct pair of conductors connected Check the connections to the left hand input board Rectify wiring if incorrect Check ac voltage on all even electrodes immersed in water with a true r m s voltmeter A voltage of less than 0 1V ac indicates a fault condition If wiring to all even electrodes is correct and the electrodes still give a voltage reading of greater than 0 1V ac and a fault is still indicated carry out the following procedure 1 Remove both conductors from electrode 2 With the conductors isolated from each other the level display should show electrode 2 as alternating between water and steam green and red With the conductors touching each other the level display should show electrode 2 as being in steam Repeat operations 1 and 2 for all affected even numbered electrodes until a faulty indication is found The above procedure checks the electrode wiring If the disp
124. four screws securing the front panel and lay the panel carefully away from the top of the box still connected by the ribbon cable Carefully remove the link headers from sockets LK2 and LK4 on the decoding PCB by easing them out with a suitable flat bladed screwdriver See Figure 4 1 Fit the link headers removed in step 3 into sockets LK1 and LK3 Refit the front panel and the transparent cover 4 5 Remote Display Options 24683B C amp D Hydrastep 2468CB amp 2468CD Manual 4 3 4 3 1 4 3 2 4 6 MECHANICAL INSTALLATION Of the three types of remote display units types 24683B and 24683C are intended for panel mounting and type 246830 is intended for wall mounting The installation procedures for panel and wall mounting are described below INSTALLING THE 24683B AND 24683C PANEL MOUNTED UNITS The panel related dimensions for the 24683B and 24683C are Panel thickness 24683B 2mm to 9mm 24683C 2mm to 20mm Aperture 24683B 139mm high x 67mm wide 24683C 186mm high x 92mm wide The installation procedure is 1 Ensure that the panel on which the remote display is to be fitted provides easy access to the electrical connections and is sited in a good viewing position 2 Cutan aperture in the panel to the dimensions given above and remove any burrs 3 Remove the clamps if fitted from the remote display unit and fit the unit into the aperture from the front of the panel 4 Refit the clamps to the displa
125. he input board processes the electrode inputs to provide water level data for display purposes and a current output representing the water level Fault detection is also carried out where the condition of the electrode inputs are examined and a FAULT is indicated when 1 open circuit in either of the electrode conductor cores is present 2 short circuit to EARTH on either the electrode or conductor cores 3 water above steam condition exists 4 An internal circuit fault condition exists A current output circuit is also provided on each input board This gives an analogue representation of the water level The sense forward or reverse and type 0 20mA or 4 20mA is selectable and described in Section 2 5 of this chapter Fault indication on the analogue output is an oscillating waveform of approximately 0 5 Hz superimposed on the main analogue signal The electrode inputs to each input board are passed to the other input board so that each analogue circuit can output the full range content of electrode input signals However should either of the input boards fail the remaining board recognises that data is missing and doubles its own electrode input signal to remedy the data loss giving a maximum error of 1 electrode Provision is made on each input board to accept one or two output boards either relay outputs or opto isolated outputs Both types of output board are offered as options Each input board produces the power s
126. igure 4 1 Location of link headers for selecting the display 4 4 Figure 4 2 Interconnection cable for a single remote 4 7 Figure 4 3 Star and daisy chain connections of remote displays 4 8 Figure 4 4 Star connection example for two remote 4 9 Figure 4 5 Daisy chain connection example for two remote displayS 4 10 Figure 4 6 Cable connection details for the remote display 4 11 Tables Table 4 1 Fault Analysis and Correction Chart seen 4 13 Table 4 2 Remote Display Replacement Parts sees 4 16 24685034 Hydrastep 2468CB amp 2468CD Manual Remote Display Options 24683B C amp D 4 1 24685034 REMOTE DISPLAY OPTIONS The 24683B C and D Remote Display Units give a repeat display of the water level state and fault alarm state of the Hydrastep 2468 Electronic Gauging System Each type of remote display operates in the same way The only difference between them is in their mechanical construction The 24683B is a small LED display for panel mounting the 24683C is large LED display for panel mounting and the 246830 is a large LED display for wall mounting contained in a splash proof box to IP65 NEMA 4X standard O
127. in operation 3 but refer to the components etc on the mounted output board This concludes the mechanical installation of the output board s and should be followed by the electrical installation If the latter is not to be carried out in the immediate future then the power supply can be reconnected 24685034 Hydrastep 2468CB and 2468CD Manual 3A 2 3 3a 2 3 1 3a 2 3 2 24685034 Relay Output Board Option ELECTRICAL INSTALLATION This sub section deals with the output of the states of the four relays Two 8 way sockets are provided with each output board through which the relay outputs are delivered to their external destinations PCB Interconnections Signal interconnection between the input board PCB1 and the output board PCB4 is direct via the SK1 PL1 12 way Berg connectors When two output boards are fitted the top board s plug PL1 engages in the lower board s SK1 Relay Output Connections The relay outputs can be taken out of the enclosure via the gland plate or along with the other cables in suitable trunking Use screened cables for all connections making sure a good annular ring shape connection is made with a good quality RF cable gland The run must be stress free and it is considered good practice to twist relay pairs together Since the output board is mounted on top of the input board the routing of the relay cabling should take the same kind of formation as the electrode cabling but separa
128. information on channel identity and the switch electrode state 3b 3 1 4 Electrode Alarm Operation RL1 function only SW6 Relay 1 can be configured to receive either an electrode input or it can be used as the system fault relay The two positions are detailed in Figure 3b 1 on page 3b 6 When configured as the system fault relay the normal non fault state of the relay is energised The system fault output connections are shown in the next section 3b 3 1 5 System Fault Output Relay 1 on each delay relay board can be configured to be a system fault relay by setting SW6 When used as a system fault relay the normal state of the relay is energised and a fault state will de energise the relay The relay will only output faults detected by the input board onto which it is installed With a dual power supply Hydrastep unit this means it is necessary to used two delay relay boards one on each input board to create a system fault output Relays shown in de energised state To alarm annunciator Odd fault relay Even fault relay RH input board LH input board To alarm annunciator Odd fault relay Even fault relay RH input board LH input board Alarm off when contacts open Switch SW6 set for fault signal operation Note Systems with a local display have an opto isolated system fault available from the display board 3b 8 24685034 Hydrastep 2468C
129. ion to the unit through RF glands mounted on the gland plate should be used for all units that need to comply with the requirements of the European EMC Directive Gain access to each input board and proceed as follows 1 Ensure that the mains cable is safely isolated before starting work and ensure that enough length is prepared to install it according to the route described in Step 2 and Step 3 below The power inlet must be dedicated to that function only No signal wiring must share the power inlet cable Two separate protected AC mains circuits of the same electrical phase may be provided in a suitably rated multi way cable 2 Use a good quality RF cable gland and ensure there is a good annular ring shape connection with the screen A ferrite supplied must be attached inside the unit to each supply input as close to the inlet gland as possible Make a double turn through each ferrite ensure that the cable is prepared with enough length to accommodate this and have the entire run stress free 3 Route the cables to both boards along the right hand catch side of the enclosure The supply wiring to the even numbered electrode boards should run up the right hand side and across the top of the enclosure Do not run it close to the display board ribbon cables The run must be stress free and it is good practice to twist power pairs together The use of a self adhesive cable tie not supplied is recommended to hold the power ca
130. iring If the display does not show the correct results then check for a break in either of the suspect electrode conductors Carry out repair to any faulty connection or substitute a new conductor or cable assembly in place of the defective item If the wiring checks carried out as described above have not located a fault then dirt on an electrode insulator may be the cause of the problem giving an effective short circuit to ground Check all odd numbered electrodes alternating between water and steam for dirt over the external insulator and clean with a cloth as required Checking for dirt on the internal insulator of the electrode requires the draining of the water column refer to the appropriate manual for the correct procedure Once the water column is drained check the ac voltage on each odd numbered electrode using a true r m s voltmeter Any electrode showing a voltage of less than 3V ac needs cleaning or replacement Electrodes must be removed from the column for inspection and cleaning Note The electrode insulator can be cleaned using a clean cloth Table 2 3 Fault analysis corrective action chart continued 2 27 2468CB amp 2468CD Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual Indication Fault s Analysis and Corrective Action State 5 contd Integral circuit fault If the wiring checks carried out as described above on right hand circuit have not located the fault then it
131. is 3 3c 2 1 2 Pre installation 3 3C 2 2 MECHANICAL INSTALLATION 4 3c 2 2 1 Fitting Nylon Spacers to the Opto Isolated Output Board 4 3c 2 2 2 Mounting the Opto Isolated Output Board on to the Input Board4 3C 2 3 ELECTRICAL INSTALLATION 5 3 2 3 1 PCB Interconnections 5 3 2 3 2 Opto lsolated Output Connections 5 OPTO ISOLATED OUTPUT BOARD 6 3C 3 4 CONFIGURING THE OPTO ISOLATED OUTPUT BOARD 7 3 3 1 1 Electrode Opto Output Selection Opto 1 Opto 2 Opto 3 4 Opto 4 Outputs SW1 SW4 7 3 3 1 2 Electrode Alarm Operation output 1 function only SW6 8 3c 3 1 3 Opto Isolated Output Activation In Steam or In Water SWS se eh ttn abet e el ett 8 3c 3 1 4 System 8 3C 3 2 ALARM AND TRIPPING FACILITIES 9 30321 Philosophi traten PED E 9 3 3 2 2 Opto Output Interconnections for Alarm Tripping Systems 9 3c 3 2 3 One out of Two Opto output Alarm System 10 3c 3 2 4 Two out of Two Opto output Alarm System
132. is possible and board or the display internal fault exists board 1 Disconnect the electrode cable sockets from the input boards Make up four 10 way sockets six or eight sockets required for systems with more than 16 points with wire links connecting the following pins on each Socket 1 2 4 5 6 7 9 10 Insert these sockets in place of the electrode cable sockets in the input boards The level display should now show an all steam state and no fault indication If this does not occur an internal fault exists The circuit fault may be on either input board or the display board If spares are available change the right hand input board first and if the fault is not rectified change the display board followed by the left hand input board If spares are not available call the service engineer State 6 Internal circuit fault This state is indicating a fault which is not related to an Bottom half of right hand circuit electrode error because no LED pairs are alternating fault LED board or the display between water and steam It is therefore likely that an illuminated board internal fault exists No LED pairs Follow same procedure as above alternating between water and steam Table 2 3 Fault analysis corrective action chart continued 2 28 24685034 Hydrastep 2468CB and 2468CD Manual 2468CB amp 2468CD Dual Power Supply Version Indication Fault s Analysis and Corrective Action State 7 N
133. it to the present loom Tighten the gland nut if applicable and close the instrument front cover OWE 59 2 B L H Z HB m PL 227 n 1 e Part of Display Board showing PLA If the installation is adversely affected by the operation of nearby equipment then re routing the cables to these instructions should improve the performance e Avoid bundling the cables from both channels together e Ensure that cables run against earthed metalwork where possible e Use screened cables for all connections making sure that a good annular ring shape connection is made with a good quality RF cable gland Electrode Relay and Analogue Output wiring on the left hand enclosure hinge side should not be pressed hard against the ribbon cables but instead run forward of the connectors and away from the side of the casing Do not run the wiring over the PCB Wiring on the right hand enclosure catch side should be tucked into the back of the enclosure next to the connectors and as close to the casing as possible and below the vase plate level Supply wiring should be run close to the metalwork forward of the signal wiring but never along the left hand hinged side of the enclosure near the ribbon cables The ribbon cables must be run under the back plate and u
134. lation under ATEX directive 94 09 EC refer to safety instruction manual 24685033 SI Part 3 Appendix Appendix A contains a CSA certified connection drawing and associated notes Caution A For installation in potentially explosive atmospheres in Canada and USA refer to control drawing 24685037 in Part 3 SYMBOLS USED IN THIS MANUAL AND ON THE UNIT Meaning Direct Current Alternating Current Earth ground terminal Protective conductor terminal Caution refer to accompanying documents Part 1 Hydrastep 2468CB amp 2468CD Electronic Gauging System 24685034 Pt 1 1 Pt 1 2 24685034 24685034 DANGEROUS VOLTAGES ARE PRESENT IN THIS EQUIPMENT ANY WARNING NOTICES OR PROCEDURES CONTAINED IN THIS MANUAL OR ON THE EQUIPMENT SHOULD BE STRICTLY OBSERVED TO MAINTAIN SAFETY THE USE OF THIS EQUIPMENT IN A MANNER NOT SPECIFIED IN THIS MANUAL MAY IMPAIR THE PROTECTION PROVIDED BY THIS EQUIPMENT GREAT CARE SHOULD BE EXERCISED WHEN SERVICING THIS EQUIPMENT TO ENSURE COMPLIANCE WITH THE EMC DIRECTIVE WHERE APPLICABLE THE INSTRUCTIONS ON CABLE SCREENING ROUTING AND TERMINATION GIVEN IN THIS MANUAL MUST BE FOLLOWED Pt 1 3 Pt 14 24685034 Part 1 Contents Chapter 1 Introduction to the Hydrastep 2468 Electronic Gauging System Chapter 2 2468CB amp 2468CD Dual Power Supply Version Chapter 3a 2468 Relay Output Board Option Chapter 3b Delay Relay Output Board Option Chapter 3c 2468 Opto isolated
135. lative to the drum before releasing it for electrical work and cabling 24675030 Installation Procedures Hydrastep Pressure Parts E ale HAD Hor THIF m a Sky 1 tan 2 m Ze 2 es zB E 2 xd Figure 2 2 Typical water column installation showing optional column lagging 24675030 2 7 Installation Procedures NIT ARPENTER amp PATERSON ATE TO BE CALCULATE TO INCLUDE THE WATER COLUMN ALL ISOLATIN VALVES amp ALL ASSOCIATED IPEWORK FOR STEAM ATER amp DRAIN LINES TYPICAL SLIN 12 MS SLING FORK E SITE BUTT WELD N OR SOCKET WELD H H INSTALLATID ARRANGEMENT 2 8 3 ROD Hp Hydrastep Pressure Parts DETAIL OF WASHER 8 HES ICAL SEATING F eee FULL THREAD PX X INSTALLATION 520 amp NGEMENT i FORK END DETAIL Figure 2 3 Typical water column suspension 24675030 Hydrastep Pressure Parts Fault Repair and Commissioning 3 1 3 2 2
136. lators or to the sealing gasket e Assemble the new electrode to the water column as detailed in sub paragraph 3 1 3 for low pressure electrodes paragraph d 3 5 Fault Repair and Commissioning Hydrastep Pressure Parts 3 2 3 2 1 3 6 f Refit the electrical lead s and guard Recommission as detailed later in this Chapter PROCEDURE FOR CHANGING HIGH PRESSURE ELECTRODES Carry out the isolation procedure as detailed in sub section 3 1 2 Ensure that the tripping is disabled see Safety Precautions sub section 3 1 1 There is no need to switch off the Hydrastep electronic equipment allow system about 20 minutes to cool down then a Remove the electrode cover guard taking care to avoid knocking the electrodes Note Remove only one electrode at a time avoids risk of incorrect reconnection b Disconnect the leads extract the electrode carefully without damage to the seat face C Inspect the column seat remove any scaling or residue taking care not to damage the seat d Carefully unpack the new electrode and check that there is no damage to the ceramic insulators or to the seating ferrules e Lightly coat the electrode threads with anti seize compound Part No 830007220 and assemble the new electrode to the water column as detailed in sub section 3 1 3 for high pressure electrodes Note Atthe first pressure temperature test check for leaks and tighten electrode nut as necessary but not exceeding 74 turn from
137. lay does not show the correct results then check for a break in either of the suspect electrode conductors Carry out repair to any faulty connection or substitute a new conductor or cable assembly in place of the defective item Table 2 3 Fault analysis corrective action chart continued 2 25 2468CB amp 2468CD Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual Indication Fault s Analysis and Corrective Action State 3 contd State 4 Top half of fault LED illuminated No LED pairs alternating between water and steam 2 26 Dirt on electrode Affected electrode alternates between water and steam Internal circuit fault on left hand circuit board or the display board Internal circuit fault on left hand circuit board or the display board If the wiring checks carried out as described above have not located a fault then dirt on an electrode insulator may be the cause of the problem giving an effective short circuit to ground Check all even numbered electrodes alternating between water and steam for dirt over the external insulator and clean with a cloth as required Checking for dirt on the internal insulator of the electrode requires draining of the water column refer to the appropriate manual for the correct procedure Once the water column is drained check the ac voltage on each even numbered electrode using a true r m s voltmeter Any electrode showing a voltage of
138. lectrode state 3 1 4 Electrode Alarm Operation RL1 Function Only SW6 Relay 1 can be configured to receive either an electrode input or it can be used as the system fault relay see Figure 3a 1 on page 3a 6 When configured as the system fault relay the normal state of the relay is energised a fault state will de energise the relay See the next section for contact output details 3a 3 1 5 System Fault Output Relay 1 on each relay board can be configured to be used as a system fault relay by setting SW6 When used as a system fault relay the normal state of the relay is energised and a fault state will de energise the relay The relay will only output faults detected by the input board onto which it is installed With a dual power supply Hydrastep unit this means it is necessary to used two relay boards one on each input board to create a system fault output Relays shown in de energised state To alarm annunciator Odd fault relay Even fault relay RH input board LH input board Alarm off when contacts closed RL1 RL 1 A To alarm annunciator Odd fault relay Even fault relay RH input board LH input board Alarm off when contacts open Switch SW6 set for fault signal operation Note Systems with a local display have an opto isolated system fault available from the display board 3a 8 24685034 Hydrastep 2468CB and 2468CD Manual
139. lectronic Gauging System 14 2468 UPGRADE PATHS AND AVAILABLE OPTIONS Table 1 1 describes the available versions of the Hydrastep 2468 Electronic Gauging System and their possible options Existing System Available Options Comments Description PartNo Relay output board 24680504C 2468 CA or 2468 CC Time delay relay 24680509B Up to two boards of any one output board type can be fitted 16 point EGS with local display Opto isolated 24680505A output board Single power supply Remote display 24683B C or D Up to 6 can be used unit Input board 24680501C Provides an additional power upgrade ac supply ac mains source and 16 point input circuit Upgrades 2468CA to 2468CB Input board 24680516B Provides an additional power upgrade dc supply 24V dc source and 16 point input circuit Upgrades 2468CC to 2468CD Relay output board 24680504C 2468 CB or 2468 CD Time delay relay 24680509B Up to four boards of any one output board type can be fitted 32 point EGS with local display Opto isolated 24680505A output board Dual power supply Remote display 24683B Up to 6 can be used unit Note f required a 24680501C board can be fitted to a 2468CC or a 24680516B board can be fitted to a 2468CA to upgrade to a 2468CE The 2468CE is a 32 point Electronic Gauging System EGS with one ac mains source power supply and one 24Vdc source power supply Table 1 1 Upgrade pa
140. less than 3V ac needs cleaning or replacement Electrodes must be removed from the column for inspection and cleaning Note The electrode insulator can be cleaned using a clean cloth If the wiring checks carried out as described above have not located a fault then it is possible that an internal fault exists 1 Disconnect the electrode cable sockets from the input boards Make up four 10 way sockets six or eight sockets required for systems with more than 16 points with wire links connecting the following pins on each Socket 1 2 4 5 6 7 9 10 Insert these sockets in place of the electrode cable Sockets in the input boards The level display should now show an all steam state and no fault indication If this does not occur an internal fault exists The circuit fault may be on either input board or the display board If spares are available change the left hand input board first and if the fault is not rectified change the display board followed by the right hand input board If spares are not available call the service engineer This state is indicating a fault which is not related to an electrode error because no LED pairs are alternating between water and steam It is therefore likely that an internal fault exists Follow same procedure as above Table 2 3 Fault analysis corrective action chart continued 24685034 Hydrastep 2468CB and 2468CD Manual 2468CB amp 2468CD Dual Power Supply Version Indica
141. n each type of remote display there are two columns of LEDs a red column to indicate steam and a green column to indicate water This provides a clear indication of the water level in the monitored system The number of LEDs that may be illuminated depends on the number of electrodes being used To mask the unused LEDs a blanking panel is provided this should be fitted on the inside of the front panel An electrode fault or a wiring or circuit fault is indicated by a yellow LED The 2468 will drive a maximum of six remote displays using star or daisy chain connections One remote display can be powered from the 2468 All other remote displays must be locally powered On each type of remote display connection to the 2468 is made through a 20 way screw clamp terminal block Access to the terminal block on the 24683B and 24683C is via a cut out in the rear panel Access to the terminal block on the 24683D is made via cable glands on one end of the enclosure 4 3 Remote Display Options 24683B C amp D Hydrastep 2468CB amp 2468CD Manual 42 CONFIGURATION All remote displays can be configured for operation with 8 to 16 electrodes two LEDs per electrode or 18 to 32 electrodes one LED per electrode Remote displays are supplied ready for operation with 8 to 16 electrodes If a remote display is required to operate with 18 to 32 electrodes then it must be reconfigured The procedure for each type of remote display is described below 4
142. n the water column dimensions etc refer to Figure 1 2 in Chapter 1 part two of the manual 4 5 Unit Description Hydrastep Pressure Parts 4 4 4 6 WATER COLUMN H P The high pressure water column is manufactured from 2 NB SCH XXS carbon steel pipe The inserts used are made from high grade stainless steel and are welded into position on the water column body The top cap and the drain components of the water column are manufactured from forged carbon steel bar the drain components being available in 3 2 1 sizes A lug is machined on the top cap to accept a vertical forked member for support of the water column when in situ The steam and water connections are made from 1 N B SCH 160 carbon steel pipe with weld preps already machined to weld the water column to the steam system The electrode covers are fabricated from stainless steel with support blocks attached to the column body The covers are held in place by screw fasteners The complete assembly is of welded construction with the welding to ASME IX requirements The materials and design are to ASME B31 1 The completed water column undergoes pressure proof tests at 15096 of duty pressure after manufacture For further details on the water column dimensions etc refer to Figure 1 3 in Chapter 1 part two of the manual 24675030 Hydrastep Pressure Parts Unit Description 4 5 24675030 WATER COLUMN H P SUPERCRITICAL The high pressure
143. ng valve until the steam line is completely cleared Close the steam valve fully Slowly open the water isolating valve until the water line is also completely cleared Close the water valve fully Close the drain valve and re check the transient response If the response times are still seriously in error it is probable that the steam or water valve is not seating or opening properly and needs re seating Note Ensure that all valves are left correctly set and locked WATER COLUMN LIFE The water column life may be reduced if the water quality is not monitored and kept chemically inert and pure The end user is advised to pay particular attention to this water quality requirement to safeguard the longevity of the Hydrastep pressure parts 3 7 Fault Repair and Commissioning 3 8 Hydrastep Pressure Parts 24675030 Hydrastep Pressure Parts Unit Description 24675030 4 Unit Description Contents Page No 4 1 LOW PRESSURE ELECTRODES 4 3 4 2 HIGH PRESSURE ELECTRODES 4 4 4 3 WATER COLUMN L P ici 4 5 4 4 WATER COLUMN H P lu 4 6 4 5 WATER COLUMN SUPERCRITICAL 4 0 4 7 Illustrations Figure 4 1 Low pressure sessi enne enne 4 3 Figure 4 2 High pressure
144. ning or replacement Electrodes must be removed from the column for inspection and cleaning Note The electrode insulator can be cleaned using a clean cloth If the wiring checks carried out as described above have not located a fault then it is possible an internal fault exists 1 Disconnect the electrode cable sockets from the input board Make up four 10 way sockets six or eight sockets required for systems with more than 16 points with wire links connecting the following pins on each Socket 1 2 4 5 6 7 9 10 Table 2 3 Fault analysis corrective action chart continued 24685034 Hydrastep 2468CB and 2468CD Manual 2468CB amp 2468CD Dual Power Supply Version Indication Fault s Analysis and Corrective Action State 1 contd State 2 Top and bottom halves of fault LED illuminated No LED pairs alternating between water and steam State 3 Top half of fault LED illuminated One or more LED pairs alternating between water and steam 24685034 Internal fault Electrode wiring or internal fault Even numbered electrode connection open circuit or short circuit to earth Affected electrode alternates between water and steam Incorrect wiring broken connection or damaged cable assembly 3 Insert these sockets in place of the electrode cable Sockets in the input boards the level display should now show an all steam state and no fault indication If this does not occur an internal
145. o power to one Only odd LEDs illuminating indicates a problem with Only odd or input board or a the left hand input board Only even LEDs illuminating even LEDs power supply fault indicates a problem with the right hand input board illuminated Check the wiring to the unit from the mains supply then check the following Fuse and fuse rating Voltage and voltage setting See Section 2 2 amp 2 3 of this chapter If none of these checks locate the problem and the correct mains supply voltage is present at the input board terminals then a circuit fault exists and replacement of the faulty input board is required State 8 Wrong setting of Refer to Section 2 3 of this chapter and ensure that the Chequered Number of Switch is set correctly If the display still shows a pattern on RED Electrodes switch chequered pattern then a circuit fault exists on the amp GREEN LED o display board display board and the board will need replacing display State 9 Wrong setting of ON OFF pattern Number of amp Electrodes switch GREEN LED or linking on LK2 As above display LK3 LK4 LK5 incorrect on display board State 10 Lower electrodes not displayed As above As above Table 2 3 Fault analysis corrective action chart continued 24685034 2 29 2468CB amp 2468CD Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual 2 6 1 2 6 1 1 2 6 1 2 2 6 1 3 2 6 1 4 2 30 COMPONENT REPLACEMENT The Hy
146. on the gland plate should be used for all units that need to comply with the requirements of the European EMC Directive The supply is connected to the unit in the same way as for the AC version A ferrite supplied must be attached inside the enclosure for each DC inlet with a double turn The DC inlet must not be shared by signal wiring for any other purpose Route the supply wires in twisted pairs as described in the AC section The DC supply must be either negative earth of fully isolated from plant ground 1 Positive Vs is connected to the terminal marked L 2 Negative Vs is connected to the terminal marked N 3 separate ground wire is required which must be connected to the earth stud on the enclosure 4 Fora non isolated supply the maximum difference between the plant earth at the water column and the Vs supply is 7V 5 Use a good quality RF cable gland and ensure there is a good annular ring shape connection with the screen The Hydrastep 2468C unit must be earthed via the protective earth terminal stud on the enclosure The cable or braid used to attach the unit to the protective earth must be capable of carrying a current of at least 10A No disconnecting device should be fitted to the protective earth conductor 24685034 Hydrastep 2468CB and 2468CD Manual 2468CB amp 2468CD Dual Power Supply Version 2 4 2 5 Analogue Output Connection WARNING Mains voltages are present in this instrument when power is
147. onics 22 AWG 0 324 7x0 25mm individually shielded 2 pair up to 250m from 2468 unit twisted Belden type No 8723 Two cables required 22 AWG 0 324mm 7x0 25mm individually shielded 4 pair twisted Alpha Wire type No 6054C One cable required Powered from 2468 electronics 22 AWG 0 324 7x0 25mm individually shielded 3 pair up to 500m from 2468 unit twisted Belden type No 8777 Two cables required 22 AWG 0 324mm 7x0 25mm individually shielded 6 pair twisted Belden type No 8778 One cable required Powered from 2468 electronics 18 AWG 0 826mm 16x0 25mm individually shielded 3 pair up to 1000m from 2468 unit twisted Belden type No 9773 Two cables required 22 AWG 0 82 16x0 25mm individually shielded 6 pair twisted Belden type No 9774 One cable required The main Hydrastep 2468 unit is approved for operation in a hazardous environment to EExnA T4 Compliance with this approval requires that armoured cable is used to connect a remote display to the main unit A remote display must not be used in a hazardous environment 24685034 4 17 Remote Display Options 24683B C amp D Hydrastep 2468CB amp 2468CD Manual 4 18 24685034 Part No Status Issue Authors Date mobrey Hydrastep Pressure Parts Operating Manual 24675030 B A J Smith M Le Fevre RCD March 2006 Pt 2 2 24675030 About this manual This manual describes various proced
148. oning system NO FAULTS will perform a low level trip at electrode level 3 For a high level trip using electrode channels 11 12 9 and 10 respectively and switch SW5 set for W a healthy system would trip at level 10 Case A circuit normally open circuit short circuit one pair to trip PL2 PL2 Note External power must be applied as shown See specification for power requirements Opto output 1 Opto output 1 To alarm annunciator or tripping device Opto output 2 Opto output 2 Odd Electrodes RH Input Board Even Electrodes LH Input Board Switch SW5 is set to S for low level alarms and set to W for high level alarms Case B Opto output circuit normally short circuit open circuit one in each pair to trip PL2 PL2 Note External power must be applied as shown See specification for power requirements Opto output 1 To alarm annunciator or tripping device Opto output 2 Opto output 2 Odd Electrodes RH Input Board Even Electrodes LH Input Board Switch SW5 is set to W for low level alarms and set to S for high level alarms 3c 12 24685034 Hydrastep 2468CB amp 2468CD Manual Opto isolated Output Board Option 3c 3 2 6 Two out of Three Opto output Alarm System In the following diagrams 6A amp
149. p the left hand hinged side of the enclosure and secured by using clips supplied 24685034 Hydrastep 2468CB and 2468CD Manual 2468CB amp 2468CD Dual Power Supply Version 2 5 2 5 1 2 5 1 1 24685034 This concludes the electrical installation requirements for the basic instrument configuration Connections within the enclosure for the options available will be covered in the Installation sections of the appropriate Chapter 3a Relay Outputs 3b Relay with time delay Outputs 3c Opto isolated Outputs or Chapter 4 Remote Display SYSTEM CONFIGURATION This section describes mains voltage selection analogue output setting and electrode error configuration on each input board Also the number of electrodes setting and configuration of the water steam switching threshold value display board is described The three main PCBs require configuration These are e Two Input Boards PCB 24680501 or 24680516 e Display Board 24680515 INPUT BOARD PCB 24680501 OR 24680516 Two settings may be configured on this board the analogue output range and sense and the electrode error configuration Analogue Output Configuration WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover Two sets of split pads are provided to select the required range 0 20mA or 4 20mA and the sense of the mA current output normal sense as shown or in reverse i e 4 20m
150. plies and electrode data from the input boards This data is decoded and used to illuminate the required LEDs mounted on the display board The data is also converted to serial format for transmission to remote display units The water level in the column is indicated on the front panel by two columns of 32 LEDs one green column to indicate the electrodes which are in water and one red column to indicate the electrodes which are in steam The number of LEDs illuminated is dependent on the number of electrodes being used in the system When 8 to 16 electrodes are being used the unit illuminates two LEDs per electrode When between 18 and 32 electrodes are being used the unit illuminates one LED per electrode In both cases the display is top biased unused LEDs are at the bottom of the display A blanking label is provided to mask any LEDs that are not used The system fault is indicated by the yellow LED Provision is also made for external indication of a system fault This takes the form of an opto isolated output which is normally in its short circuit state When an alarm condition exists the opto isolated output is open circuited Full illumination of the Fault LED indicates a water above steam condition has been detected Illumination of half the Fault LED indicates an electrode wiring or input board related fault The top half of the Fault LED illuminates when faults are detected by the left hand input board the even electrodes and the
151. ply variations ambient temperature changes etc resulting in a highly reliable system Figure 1 1 shows the resistance measuring cell complete with installed electrode Figure 1 2 and Figure 1 3 show examples of the Low Pressure 120bar 1740p s i and the Series 3 and Super 3 High Pressure 210bar 3045p s i amp 300bar 4350p s i Water Columns respectively 12 WATER LEVEL INDICATION Each electrode is connected to its own electronic measurement channel where the resistance value measured decides which of two Light Emitting Diode LED drive circuits is energised The LEDs are presented in two columns one column of green LEDs illuminated for water and one column of red LEDs illuminated for steam indicating the water level STEAM FROM BOILER E ceo E To _ 218 Z ATER COLUMN WALL P ELECTRODE INSERT J ELECTRODE 2 gt P fte ON d 2 e E YI ELECTRODE etm Ap LEADS Z Rr TA EARTH CONNECTION FEED WATER FROM BOILER Figure 1 1 Schematic of high pressure resistance measuring cell and electrodes 24675030 1 3 General Introduction Hydrastep Pressure Parts L F ELECTRODES SER IE Imm MINIMUM PITCH
152. pply POWER OV from 2468 or local supply SIG VE from 2468 SIG VE from 2468 24685034 REAR VIEW OF REMOTE DISPLAY Terminal TB 1 SIG VE 2 SIG VE 3 SIG VE 4 SIG VE 5 6 POWER 7 8 9 POWER VE 10 gt EARTH 11 12 POWER 13 VE 17 SIG 18 SIG VE 19 SIG VE 20 SIG VE 183 284 5 647 889 12 amp 13 14 15 amp 16 17 amp 19 18 amp 20 10 amp 11 ODD LEDs 1 A EVEN LEDs Signal VE from 2468 Signal VE from 2468 Power OV from 2468 or local supply Power VE from 2468 or local supply Power VE from 2468 or local supply Power OV from 2468 or local supply Signal VE from 2468 Signal VE from 2468 Earth Figure 4 6 Cable connection details for the remote display 4 11 Remote Display Options 24683B C amp D Hydrastep 2468CB amp 2468CD Manual 4 4 5 4 12 CONNECTING THE DISPLAY CABLES TO HYDRASTEP 2468 WARNING Mains voltages are present in the 2468 Hydrastep unit when power is connected De energise before opening the front cover The connection procedure is 1 2 Ensure a stress free cable run between the remote display unit and Hydrastep 2468 Gain access to the display board in the 2468 The cable from the remote display requires connecting to connectors PL3 and PL7 on PCB 24680515
153. put board receives inputs from the even numbered electrodes interconnections between odd and even relay boards will be required The following are examples of relay configurations used 3b 11 Delay Relay Output Board Option Hydrastep 2468CB and 2468CD Manual 3b 3 2 3 One out of Two Relay Alarm System Either of the relays involved can cause an alarm when their assigned electrode registers an alarm condition The alarm condition is selected by switch SW5 to provide relay energisation in water EW or energisation in steam ES Case A Relays normally energised de energise either one to trip Relays shown in de energised state prt i PL2 PL2 B 2 lt 2 To alarm annunciator 3 gt 3 4 gt 4 Odd electrodes Even electrodes RH input board LH input board Alarm off when contacts closed RL 1 To alarm annunciator Odd electrodes Even electrodes RH input board LH input board Alarm off when contacts open Switch SW5 is set to ES for low level alarms and set to EW for high level alarms Case B Relays normally de energised energise either one to trip Relays shown in de energised state PL2 To alarm annunciator Odd electrodes Even electrodes RH input board LH input board Alarm off when contacts closed REI 4 PL2 PL2 To alarm annunciator gt A Odd electrodes Even electrodes RH input board
154. quired and close the enclosure cover Re apply the power 3A 4 2 PARTS LIST RELAY OUTPUT BOARD 24680504 The following list items are available as spare parts are Mobrey Part fare Mobrey Part Item Description Item Description Electrical Mechanical Relay PCB assembly 24680504C Spacer nylon 15 9 LG 412012080 Socket 5K2 free 8 way 351508100 Washer nylon 411999910 Nut M4 410031020 Socket 5k3 free 8 way 351503100 24685034 3a 15 Relay Output Board Option Hydrastep 2468CB and 2468CD Manual 3A 5 SPECIFICATION Outputs 4 x Alarm Trip Relays Relay Contact Rating ac dc Maximum voltage 250V 125V Maximum current 8A 8A Maximum switching power 1500VA 240W lt 30V 65W x60V 25W lt 125 For type nA safety 100mA at 30Vdc Maximum initial contact resistance 30 3a 16 24685034 Hydrastep 2468CB and 2468CD Manual Delay Relay Output Board Option 3b Delay Relay Output Board Option Contents Page No 3B 1 GENERAL DESCRIPTION oreet a a 3 3B 2 INSTALLATION as 3 3B 2 1 STORAGE amp PRE INSTALLATION 3 3b 2 1 1 Storage arda 3 3b 2 1 2 Pre Installation 2 3 3B 2 2 MECHANICAL INSTALLATION 4 3b 2 2 1 Fitting the Nylon Spacers to the Delay Relay Output Board 4 3b 2 2 2 Mounting the Delay Relay Output Board on to
155. re of the unit improving the cable layout from the opto isolated output boards The spacer fixing holes and mounting holes are illustrated in Figure 3c 1 on page 3c 6 Note The term energised is used to describe the ON low resistance state of the opto isolated output Each of the opto isolated outputs can be energised by any one of up to 16 electrodes with an individual choice of being energised when its selected electrode is in steam or is in water Furthermore opto isolated output 1 can be used to monitor an electrode state or to register an ALARM condition When set to register the ALARM state the opto isolated output is energised in the system normal state and de energised when an ALARM condition exists This option comes complete with the nylon spacers and two 8 way output sockets INSTALLATION This sub section deals with the mechanical and electrical installation of the Opto isolated Output Board PCB 24680505 option In the rest of this chapter the opto isolated output board title is shortened to output board STORAGE amp PRE INSTALLATION INSPECTION Storage Area The storage area must be dry dust free and kept at a reasonable temperature The storage area should allow for access and inspection of all items of equipment Pre installation Inspection Open the option package and inspect the contents for signs of damage Check contents for completeness 3c 3 Opto isolated Output Board Option Hydrastep 246
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157. rode covers before pressurising the column g Itis strongly recommended that a HOT notice is attached to the water column in a prominent position h Ensure that all safe working practices for the media and processes concerned are followed during the installation and maintenance of the equipment i Ifthe equipment is likely to come into contact with aggressive substances it is the responsibility of the user to take suitable precautions that prevent it from being adversely affected thus ensuring that the type of protection both mechanical and electrical are not compromised j equipment both mechanical and electrical must not be used as a support for other equipment or personnel k Both mechanical and electrical content of the system must be protected from impact l Hydrastep installation is not protected by integral over pressure relief valves Where fitted directly to a boiler installation ensure the Hydrastep water column and associated pipework are protected from over pressurisation by the boiler safety valves 3 3 Fault Repair and Commissioning Hydrastep Pressure Parts 3 1 3 1 3 4 WATER COLUMN ISOLATION After obtaining authority to isolate the column a Close off the steam and water isolating valves b Where the column is connected to a closed drain open the drain valve and when the pressure equalises close the drain valve c Check for no pressure condition of water column A failure to
158. s 24685034 Hydrastep 2468CB amp 2468CD Manual Opto isolated Output Board Option 3c 3 2 4 Two out of Two Opto output Alarm System 24685034 This system requires both opto outputs to operate to cause an alarm when their assigned electrodes register an alarm condition Case A circuit normally open circuit short circuit both to trip To alarm annunciator or tripping device PL2 VE VE Opto output 1 Opto output 1 Odd Electrodes Even Electrodes RH Input Board Note External power must LH Input Board be applied as shown See specification for power requirements Switch SW5 is set to S for low level alarms and set to W for high level alarms Case B Opto output circuit normally short circuit open circuit both to trip To alarm annunciator or tripping device PL2 VE VE Opto output 1 Opto output 1 Odd Electrodes Even Electrodes RH Input Board Note External power must LH Input Board be applied as shown See specification for power requirements Switch SW5 is set to W for low level alarms and set to S for high level alarms 3c 11 Opto isolated Output Board Option Hydrastep 2468CB amp 2468CD Manual 3c 3 2 5 Two out of Four Opto output Alarm System In the following diagrams amp 5B O indicate the electrode channel selected for each opto output A fully functi
159. s concerning steam raising plant is the provision of an automatic low water level shut down or trip device In the 2468 Hydrastep the opto isolated output board provides the required output signals for such devices In practical applications of shut down systems two factors must be considered the consequences of spurious trips and the non availability of a trip when required due to protection system faults The following opto isolated output for brevity this output title will be shortened to opto output circuits are specific to the 2468 Hydrastep Level Indicator versions Opto Output Interconnections for Alarm Tripping Systems It is necessary to open the Hydrastep 2468 Electronic Enclosure to carry out any wiring therefore care must be taken when working inside the unit WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover Note Before any opto output interconnections are made it is necessary to fulfil any safety regulations governing the plant shutdown procedures Since one input board receives inputs from the odd numbered electrodes and the other input board receives inputs from the even numbered electrodes interconnections between odd and even opto isolated output boards will be required The opto outputs are normally open circuit and are switched into a conducting mode short circuit when their dedicated electrode detects its allotted water steam state to signal an
160. sent on the return signal and is relatively high compared to the ac voltage it may have the effect of lifting the square wave to the water steam switching point This will cause one or more electrodes to flash rapidly on the display as the detection circuits alternate between steam and water When combined with the problem described above the display becomes very confusing Input adapter boards 246805234 are available which fit into the electrode cable connectors on the input board see inset picture right These have series capacitors in the return side of the cables blocking any dc offset voltages The electrode cable then plugs into the Input Adapter Board instead of the electrode cable connector 55666 06650 gt SSSSSSSSSS oa meus nau EE ESE 1 Input Adapter Board 2 Input Board Partial Top View 3 Adapter plugged into electrode cable connector Horizontal View 2 9 2468CB amp 2468CD Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual 2 5 2 2 5 2 1 2 5 2 2 2 20 DISPLAY BOARD 24680515 The Display Board needs to know how many electrodes are being used and if one or two input boards are being used A centrally mounted dual in line switch assembly SW1 titled Number of Electrodes uses four individual switch channels to select between an 8 and 32 electrode operation as shown in Table 2 2
161. supplied in two main versions Single Power Supply System with Local Level Display Dual Power Supply System with Local Level Display For both systems the printed circuit boards are housed in the same enclosure allowing customers full capability to expand their system as and when conditions dictate Table 1 1 on page 1 7 is asummary of all upgrade paths and options for the Hydrastep 2468 system INPUT BOARDS All versions of the Hydrastep 2468 unit contain one or two input boards The input boards mount on to the base plate in the enclosure Each input board provides power supplies electrode drive signal processing fault analysis and an analogue output The input board can accept inputs from 8 10 12 14 or 16 electrodes When two input boards are used in a dual power supply system the electrodes are interlaced that is the odd numbered electrodes are connected to one input board and the even numbered electrodes are connected to the other Full details of the wiring are covered in Chapter 2 under Installation Each input board also includes a current output circuit that provides an analogue representation of the water level in the column The analogue output can be configured to give a current output in one of the following ranges e Oto 20MA 4to20mA e 20to OMA e 20 to 4mA DISPLAY BOARD The display board is mounted on to the hinged lid of the unit and provides indication through the viewing windo
162. t LED conductivity is probable illuminated Check water column installation is correct sloping One or more pipework and insulation details Make sure that LED pairs there is sufficient condensate flow through the alternating column between If the normal water conductivity is high the water and electrode error circuit can be de sensitised or steam disabled If the normal water conductivity is still too high 40mV at electrode the electrode error circuit must be disabled refer to the electrode error configuration section Water above steam The electrode channel s causing the problem will caused by electrode be evident from the unit display by an alternating wiring or internal fault indication in the steam area Electrode connection Check the suspect electrode s has the correct pair open circuit or short of conductors connected check the connections to circuit to earth the input board Rectify if incorrect Table 2 3 Fault analysis corrective action chart 24685034 2 23 2468CB amp 2468CD Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual Indication Fault s Analysis and Corrective Action State 1 contd 2 24 Incorrect wiring broken connection or damaged cable assembly Affected electrode s alternate between water and steam Dirt on electrode Affected electrode s alternate between water and steam Internal fault Check ac voltage on electrodes with a true r m
163. t of Four Relay Alarm System 14 3b 3 2 6 Two out of Four Relay Alarm System contd 15 3b 3 2 7 Two out of Three Relay Alarm System 16 3B 4 COMPONENT REPLACEMENT 17 3B 4 1 REPLACEMENT OF NYLON SPACERS 17 3B 4 2 PARTS LIST DELAY RELAY OUTPUT BOARD 24680509 17 24685034 3b 1 Delay Relay Output Board Option Hydrastep 2468CB and 2468CD Manual 3b 2 3B 5 SPECIFICATION EE 18 Illustrations Figure 3b 1 View of relay output board showing switch positions and output pin o UE 3b 6 Figure 3b 2 View of delay relay output board showing split pad positions 3b 10 Tables Table 3b 1 Electrode selections for relays RL1 to 4 3b 7 Table 30 2 Split pad functions on relay delay 3b 9 24685034 Hydrastep 2468CB and 2468CD Manual Delay Relay Output Board Option 3B 1 3B 2 3B 2 1 3b 2 1 1 3b 2 1 2 24685034 GENERAL DESCRIPTION The Delay Relay Output Board PCB 24680509 is mounted on top of the input board using 3 nylon spacers Electrical connection between the two boards is via plug and socket SK1 on the input board and PL1 on the delay relay output board A second dela
164. t temp Unit Specifications Hydrastep Hydrastep Pressure Parts Manual 5 2 WATER COLUMNS Type Low Pressure Rating 120bar 1740psi at 343 C 650 F Type High Pressure Rating 210bar 3045psi at 370 C 698 F Series III Type High Pressure Rating 300bar 4350psi at 560 C 1040 F Super III 5 2 24675030 Part 3 Hydrastep 2468CA CB CC amp CD Electronic Gauging System Pt 3 1 Pt3 2 Hydrastep 2468 Technical Manual Appendix A CSA Approval CSA Certified GENERAL All drawings in this manual are given here for planning purposes only Before commencing with implementation reference should always be made to the current issue of the appropriate drawings Contact the factory for details No Drawing Ref Description 1 24685037 Sheet 1 of 2 Hydrastep Control Diagram CSA Certified Connections 2 24685037 Sheet 2 of 2 Hydrastep Control Diagram Associated Notes A 1 Hydrastep 2468 Technical Manual Appendix A CSA Approval 2301 133HS zn avooiny 5907070 MMd SIN 4 0689 ON Oud eee v 9 SNIMVHG 1OH LNOO 15 VHOAH 9 888858 01 SV SNOISNSWIG 1 Lanod NI dl GALVLS AIVOS OL 38 LON AYN LNIdd 15 60 70 10 Ee 17 16 ASIMYSHLO SSFINN 58413 NI SNOISNAWIG NOISSC HO LNALWd JO LNVHO 40
165. ted from it as far as practical The cable should be arranged such that the cables do not lie across any of the PCBs The layout and plug pin details of the two plugs on the relay board is given in the diagram on the right with the relay contacts shown in their de energised state When two output boards are fitted the output terminals of the uppermost output board are offset towards the centre of the input board ECONI OUTPUT 5 BOARD 2 1 A SE L 3 fo Gans m gt oq Ei 3 ae m L a Vito BUARI a 6 4 61 te eue p74 CU ed RL 7 L lt td p E A E EN T 06 ART DF 6 UO W E E m RELAYS SHO DE ENERGISED View illustrating mounted positions of dual Relay output PCB relay output boards connectors 3a 5 Relay Output Board Option Hydrastep 2468CB and 2468CD Manual 3A 3 RELAY BOARD CONFIGURATION The 24680504 Relay Output Board has three configuration switches e SW6 Selects Electrode or Alarm state for RL1 e SWI SW4 Selects individual electrode for relays RL1 to RL4 e SW5 Selects RL1 RL4 to be energised in steam or in water Figure 3a 1 provides a view of the output board layout to highlight the positions of the various configuration switches
166. ter column are satisfactory then clamp the cable securely to its clamping bar 9 Refit any Electrode Protection Covers to the water column Water column connections for 16 electrodes Number Number Number Connection Number Number Number Connection Ny em Brown PL2 pin 2 Green PL3 pin 2 mt Brown PL2 pin 2 Blue PL3 pin 5 my se mens Red PL2 pin 5 Blue PL3 pin 5 sa neos Red PL2 pin 5 Purple PL3 7 see Pen Orange PL2 pin 7 Purple PL3 pin 7 gu oss Orange PL2 pin 7 Gre PL3 pin 10 pu eo napun Yellow PL2 pin 10 Grey PL3 pin 10 veiw Pieno Yellow PL2 pin 10 Black PL2 pin 3 se ME sa Green PL2 pin 10 Black PL2 pin 3 Note There are two conductors of each colour per cable 24685034 2 11 2468CB amp 2468CD Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual THP OF ENCLOSUR HEN MDUNTEI gt E gt S E g 3 Y R3 L H Input Board SH Input Board
167. the seat can be re cut to acceptable standards using a service tool as listed below e Service Tool 246791AA for use with electrodes 246781A and 246781Z only e Service Tool 246722AA for use with electrode 246782A only High Pressure Electrodes In the case of high pressure electrodes sealing is performed by a taper form on the electrode body The act of tightening the electrode clamping nut compresses the taper form into the port sealing taper thereby effecting a pressure seal For these electrodes the condition of the electrode port sealing surface is of great importance and the tightening procedure is given to prevent damage to the electrode or the water column electrode port Should a leak develop the electrode must be removed and both the port and taper seating surfaces examined for signs of surface deterioration Tightening Procedure For High Pressure Electrode Installation a Ensure the electrode is clean and the electrode port bore is clean and free of debris b Lightly coat the column port thread with anti seize compound Part No 830007220 C Assemble the electrode to the column port and tighten the electrode nut until the electrode will not rotate in its seat d Finally tighten the electrode nut a further s to 14 turn to complete the procedure NOTE The final to 1 4 turn corresponds to a torque level of between 28164 35Nm and 4761 60Nm turn is the recommended tightening condition 1 4 turn is th
168. the Input Board 4 3B 2 3 ELECTRICAL INSTALLATION 5 3b 2 3 1 PCB Interconnections 5 3b 2 3 2 Relay Output Connections 5 3B 3 DELAY RELAY BOARD CONFIGURATION 6 3B 3 1 DELAY RELAY OUTPUT BOARD 7 3b 3 1 1 Configuring the Delay Relay Output 7 3b 3 1 2 Electrode Relay Selection Relays RL1 RL2 RL3 amp RL4 SW1 I SW4 agama aan e 7 3b 3 1 3 Relay Energisation In Steam or In Water SW5 8 3b 3 1 4 Electrode Alarm Operation RL1 function only SW6 8 3b 3 1 5 System Fault Output 8 3b 3 1 6 Delay Circuit Configuration 2 2 9 3b 3 1 7 Configuring the Delay Circuit Split 10 3B 3 2 ALARM AND TRIPPING FACILITIES 11 3b 3 2 4 Philosophy ip tr a E E SE ER 11 3b 3 2 2 Relay Interconnections for Alarm Tripping Systems 11 3b 3 2 3 One out of Two Relay Alarm 12 3b 3 2 4 Two out of Two Relay Alarm 13 3b 3 2 5 Two ou
169. the column after all erection and electrical work is completed and the water column is ready to be commissioned Caution It is essential that the electrodes are NOT fitted until the acid and steam purging of the boiler drum has been completed However if it is essential that the Hydrastep be used to gauge the water level during acid cleaning a sacrificial set of electrodes must be used for this task with a new set of electrodes provided for installation before normal operation is started Sacrificial electrodes should be discarded The water column is provided with a lifting eye at its upper end to be used for support from the local site superstructure Before fitting the water column the following points must be checked a Ensure that access to work on this part of the plant is clear and that the Column isolating Valves have been fitted to the Steam and the Water connections on the Drum and are ready to have the water column welded to them All steam isolation valves should be fitted with their spindles horizontal Check that items of hardware required for supporting the water column are available and that the suspension points on the superstructure have been installed Water columns are normally supplied with a lifting support eye but where this is not the case alternative support must be provided The water column and associated pipework are secured to resist sympathetic vibrations from surrounding plant Ensure that
170. the relevant installation diagrams support services including that of an approved welder and suitable welding plant are available Note All joints in pipework must be welded tested and inspected in accordance with the approved welding procedure documents Ideally this should be to ASME B amp PVC Section IX Welding Qualifications but Local Regulations may otherwise apply To minimise errors due to temperature difference between the water in the boiler drum and the water in the Hydrastep column the length of the pipework between the drum and the Hydrastep column should not exceed 2 metres Paths should be as straight and direct as possible 24675030 Installation Procedures Hydrastep Pressure Parts 45 1 5mm Z ForHP 210bar Material SA106B Size 1 N B Sch 160 pipe dim For HP 300 bar Material SA479 316 Size 1 N B Sch XXS PPE For LP Material SA106B Size 1 N B Sch 80 pipe dim Figure 2 1 Universal weld profile The Steam and Water connections on the water column must be set to position the water column at the correct level before they are welded in place Figure 2 2 gives an example of the water column installation Normally the water level of the drum will be between electrodes 6 and 7 for a twelve port water column However due to the physical or operating conditions this could be offset The steam leg must slope downwards to the water column with a minimum gradient of 1 in 50 to ensure
171. this instrument when power 1 Disconnect the power supply Gain access to the input PCB by opening the cover and removing the option board 2 Check split pads SP6 amp SP7 on the input PCB are open circuit and clean this is the default setting 3 Tochange the electrode error threshold value or to disable the feature bridge the split pads SP6 or SP7 with solder as shown in the table above Repeat the procedure used in configuring the first input board to set up the remaining input board as required This concludes the configuration on the input boards WARNING Bridging SP7 will disable the electrode fault alarm In this condition a fouled electrode in water will not be detected This is of particular importance when electrodes are used for low level alarm or cut off By bridging split pad 6 on the input board the conductivity fault detection level will be increased from 10415 normal to 300uS high This may be sufficient in some cases but not all Factory modifications are available to further increase this level to 80045 160015 or 2000uS At each of these stages the measuring sensitivity of the Hydrastep system is reduced so the most appropriate level should be chosen not the highest Contact your local representative for further details Note that input boards that have been modified are marked with the number 24680229A and the conductivity level that is acceptable Offset voltages When an offset voltage is pre
172. this instrument when power is connected De energise before opening front cover Gain access to the printed circuit board assemblies inside the Hydrastep 2468 enclosure as follows 1 Isolate the 2468 electronics enclosure from its power supplies 2 Gain access to the output PCB and set the relevant switches for the required function 32 311 Electrode Opto Output Selection Opto 1 2 Opto 3 amp Opto 4 Outputs SW1 to SW4 Four identical switches are provided one for each output but see SW6 each having four sets of contacts This allows coded selection of any one of 16 electrodes for each switch in the case of the single input card When dual input cards are fitted odd numbered electrodes feed into one input card with the even numbered electrodes being fed into the other input card Each input card then offers any mounted output card the choice from its electrode inputs with the resultant selectivity as shown in Table 3c 1 Switch SW1 SW2 SW3 or SW4 Settings for Electrode Selection Opto 1 to Opto 4 respectively Switch Contacts One Input Two Input Cards Odd I P Card Even I P Card 2 Card 5 5 5 5 E 3 5 5 5 X 5 O 5 13 9 9 5 5 5 5 5 BB 5 2 N N o 5 5 5 5 9 sfe wo N wo N 5 m NI
173. ths and available options 24685034 1 7 Introduction to the Hydrastep 2468 Electronic Gauging System Hydrastep 2468CB and 2468CD Manual 1 8 24685034 Hydrastep 2468CB and 2468CD Manual 24685034 2 1 2 2 2 3 2 4 2 5 2468CB amp 2468CD Dual Power Supply Version 2 2468CB amp 2468CD Dual Power Supply Version Contents Page No INTRODUCTION sia een ete 2 3 ELECTRODE CABLING SYSTELMN 2 3 ELECTRONIC ENCLOSURE u 2 3 2 3 1 INPUT BOARD PCB 24680501 AND PCB 24680516 2 5 2 3 1 1 Analogue Output Drive Capaphbility 2 5 2 3 2 REMOTE DISPLAY DRIVE 2 5 2 3 3 DISPLAY BOARD PCB 24680515 2 6 2 33 ane o ee E 2 6 2 3 3 2 Links LK2 LK4 and 1 5 2 7 2 3 4 PCB INTERCONNECTIONG sse nnne 2 7 INSTALLATION Meer EE 2 8 2 4 1 MECHANICAL 5 2 8 2 4 2 ELECTRICAL 2 10 2 4 2 1 Electrode 2 10 2 4 2 2 Connecting Cables to Water Column Electrodes 2 11 2 4 2 3 Connecting the Electrode Cable Assemblies to 2468 EncloSUre pertes sya muyay apay kagak bye 2 12 2 4 2
174. tion Fault s Analysis and Corrective Action State 5 Bottom half of fault LED illuminated One or more LED pairs alternating between water and steam 24685034 Electrode wiring or internal fault Odd numbered electrode connection open circuit or short circuit to earth Affected electrode alternates between water and steam Incorrect wiring broken connection or damaged cable assembly Dirt on electrode Affected electrode alternates between water and steam Check that all odd numbered electrodes indicating water have the correct pair of conductors connected Check the connections to the right hand input board Rectify wiring if incorrect Check ac voltage on all odd electrodes immersed in water with a true r m s voltmeter A voltage of less than 0 1V ac indicates a fault condition If wiring to all odd electrodes is correct and the electrodes still give a voltage reading of greater than 0 1V ac and a fault is still indicated carry out the following procedure 1 Remove both conductors from electrode 1 With the conductors isolated from each other the level display should show electrode 1 as being alternating between water and steam green and red With the conductors touching each other the level display should show electrode 1 as being in steam Repeat operations 1 and 2 for all affected odd numbered electrodes until a faulty indication is found The above procedure checks the electrode w
175. trument when power is connected De energise before opening front cover This task can be performed on a mounted 2468 electronic enclosure or the enclosure can be removed to a bench for the installation Here it is assumed that the enclosure is in its normal working location The procedure for mounting the delay relay output board is as follows 1 Isolate the power supply from the 2468 electronic enclosure and open the instrument front cover 2 If two output boards are to be fitted make sure that the first output board to be fitted has had its nylon spacers fitted before installation Also ensure the first output board is fully configured before fitting the second output board 3 Ease the pins of the Berg plug PL1 of the output board into the Berg socket SK1 on the input board checking that the mounting holes on the output board the holes which are not contained in white bordered areas are aligned over the fitted spacers and gently press the output board home until the spring loaded spigot on each spacer is locked firmly on to the output board Note When fitting a second output board use the same procedure described in operation 3 but refer to the components etc on the mounted output board This concludes the mechanical installation of the output board s and should be followed by the electrical installation If the latter is not to be carried out in the immediate future then the power supply can be reconnected 24685034
176. ual is divided into three parts the first covers the electrical electronic system the second describes the pressure parts the third is for coverage of all other aspects Part 1 Electrical Electronic System Chapter 1 introduces the Hydrastep 2468 Electronic Gauging System and its operating principles Chapter 2 covers the installation configuration and fault analysis procedures Chapter 3 covers the installation configuration and fault analysis procedures for the Relay Output Board Chapter 3a the Delay Relay Output Board Chapter 3b and the Opto isolated Output Board Chapter 3c Chapter 4 covers the installation configuration and fault analysis procedures for all versions of the Remote Display Unit Part 2 Pressure Parts Chapter 1 is a general introduction to the Hydrastep system of water level determination Chapter 2 describes the water column and its components the preparation installation of the water column on to the boiler acid and steam purging of the boiler system and the fitting of the electrode sensors Chapter 3 details the fault repair procedures carried out on the system pressure parts and their commissioning Chapter 4 provides a general description of the pressure parts used in the Hydrastep systems Chapter 5 details the Pressure Parts specifications Caution For installation under the Pressure Equipment Directive PED 97 23 EC refer to safety instruction manual 24688006 5 Caution For instal
177. upplies for the whole instrument which are derived either from the local mains voltage supply of 110V ac or 240V ac nominal for the 24680501 input board or 20V dc to 40V dc for the 24680516 input board Apart from the input voltage there are two other differences between the AC 24680501 and DC 24680516 input boards These are the analogue output drive capability and the remote display drive capability Analogue Output Drive Capability With the minimum DC supply voltage of 20V for the DC input board 24680516 the maximum load that can be driven by the analogue output is 5000 At the minimum mains input voltage the AC input board 24680501 the maximum load that can be driven by the analogue output is 6000 REMOTE DISPLAY DRIVE CAPABILITY The remote display drive capability is only a consideration when the 2468C is providing power for a remote display With either input board the unit is capable of driving six remote displays at up to 1000m 3280ft from the unit but only powering one remote display any others must be locally powered With the AC input board the maximum cable loop resistance to the remote display is 27Q whilst with the DC input the maximum cable loop resistance to the remote display is 70 See remote display section for more details 2 5 2468CB amp 2468CD Dual Power Supply Version Hydrastep 2468CB and 2468CD Manual 2 3 3 2 3 3 1 2 6 DISPLAY BOARD PCB 24680515 The display board receives its power sup
178. ure range of 10 C to 40 C 50 F to 104 F with a maximum of 80 R H PHYSICAL PROTECTION The equipment shall be stored where possible in the original or robust packages to prevent accidental mechanical damage The equipment shall be stored on shelving or racks above ground level as further protection from mechanical damage and to eliminate dampness INSPECTION If the equipment is to be stored for a long period suitable access is to be provided so that regular inspection can take place These inspections should check for signs of physical deterioration and should take place at least every three months HANDLING PRECAUTIONS The water columns are heavy and lifting equipment suitable for hoisting up to 50kg should be used both for inspection and carriage The electrodes should be handled with considerable care both for inspection and installation The electronic units should be protected from electrostatic damage induced via signal input terminals INSTALLATION OF WATER COLUMN The Water Column is delivered with all electrode ports fitted with plastic inserts These inserts should not be removed until the electrodes are due to be installed 2 3 Installation Procedures Hydrastep Pressure Parts 2 4 The water column is delivered along with the correct number of electrodes of the relevant pressure type high or low and complete with gaskets or ferrules and fixing nuts where applicable The electrodes should only be fitted to
179. ures involved in the installation of the Hydrastep water columns their attachments and the electrodes used in determining the level of water in the column Part 2 Pressure Parts Chapter 1 is a general introduction to the Hydrastep system of water level determination Chapter 2 describes the water column and its components The preparation installation of the water column on to the boiler acid and steam purging of the boiler system and the fitting of the electrode sensors Chapter 3 details the fault repair procedures carried out on the system pressure parts and their commissioning Chapter 4 provides a general description of the pressure parts used in the Hydrastep systems Chapter 5 details the Pressure Parts specifications CAUTION The procedures described in this manual do not overrule any mandatory regulations and procedures applied on site regarding the installation testing and safety precautions affecting the specific Hydrastep System The objective of this manual is to describe various procedures involved in the installation of the water columns their attachments and the electrodes used in determining the level of water in the column as required by the following Hydrastep Systems Commissioning the water column and limited component repair procedures on the system pipework are also covered 24675030 Pt 2 3 Pt 2 4 24675030 REMINDER ELECTRODE INSTALLATION THREADED ELECTRODE S PART Nos 459600602 amp 4
180. ut instead run forward of the connectors and away from the side of the casing Do not route them over the board Wiring to the catch side 24680501 board single channel set up odd numbered electrodes should be tucked into the back of the enclosure next to the connectors as close to the casing as possible and below the base plate level 4 Fit the free sockets into the terminal blocks PL2 and PL3 5 Prepare the conductor core ends fit the crimp terminals and connect the conductors to their respective free sockets 6 Ensure that both cables have a stress free run inside the enclosure Hydrastep Power Supply Cables WARNING Mains voltages are present in this instrument when power is connected De energise before opening front cover AC Powered Units input board 24680501 The Hydrastep 2468C must be installed with a fuse or circuit breaker with a maximum rating of 5A mounted as close as practicable in an easily reached location The fuse or circuit breaker must be uniquely identified as the disconnecting device The cable gland used must have an inlet or bushing with a smoothly rounded bell mouthed opening with a radius of curvature of at least one and a half times the overall diameter of the mains cable fitted Alternatively a fixed guard made of insulating material protruding beyond the inlet opening by at least five times the cable diameter may be used A shielded power cable and shielded signal cables with the connect
181. w on the enclosure It also supplies configuration information to the input board s that is the number of electrodes connected to the unit and the required water steam switching threshold Figure 1 1 shows the local display with water level and system fault indication Water level is indicated by two columns of LEDs one red to indicate steam and one green to indicate water The number of LEDs illuminated is dependent on the number of electrodes present and a blanking panel is available to mask the LEDs not used In addition to the system fault indication is an opto isolated system fault output Switches are provided to allow the number of electrodes to be selected 8 10 12 14 16 18 20 22 24 26 28 30 0r 32 Two solder link pads are provided to select the water steam switching threshold 0 6uS cm or 1 6uS cm Introduction to the Hydrastep 2468 Electronic Gauging System Hydrastep 2468CB and 2468CD Manual 1 2 3 1 3 1 3 1 1 3 2 1 3 3 SYSTEM FAULTS 2468CB OR 2468CD System fault indication a yellow LED and an opto isolated output is provided for a water above steam condition an electrode fault or wiring failure and the detection of an internal fault A further fault is indicated when the electrode number switch is incorrectly set This fault is indicated by a chequered display of red and green LEDs on the level display Faults and their remedies are covered in Chapter 2 under Fault Analysis amp Corrective
182. water column is manufactured from 2 NB SCH XXS stainless steel pipe The inserts used are made from Stainless steel and are welded into position on the water column body The top cap and the drain components of the water column are manufactured from forged stainless steel the drain components being available 34 and 1 sizes A lug is machined on the top cap to accept a vertical forked member for support of the water column when in situ The steam and water connections are made from 1 NB SCH XXS stainless steel pipe with weld preps already machined to weld the water column to the steam system The electrode covers are fabricated from stainless steel with support blocks attached to the column body The covers are held in place by screw fasteners The complete assembly is of welded construction with the welding to ASME IX requirements The materials and design are to ASME B31 1 The completed water column undergoes pressure proof tests at 15096 of duty pressure after manufacture For further details on the water column dimensions etc refer to Figure 1 3 in Chapter 1 part two of the manual 4 7 Unit Description 4 8 Hydrastep Pressure Parts 24675030 Hydrastep Pressure Parts Unit Specifications Hydrastep 5 Unit Specifications Hydrastep 51 ELECTRODES Type 459600602 Type 459600802 Type 246785A Type 246782A Type 246784A Type 2467812 24675030 Complete with sealing gasket Metaflex
183. y relay output board may be mounted on top of the first on nylon spacers Holes have been drilled on all delay relay output boards to receive the 3 nylon spacers The top output board is offset towards the centre of the unit improving the cable layout from the delay relay output boards The nylon spacer fixing holes and mounting holes are illustrated in Figure 3b 1 on page 3b 6 Each of the four delay relays can be energised by any one of up to 16 electrodes with an individual choice of being energised when its selected electrode is in steam or is in water Furthermore relay RL1 can be used to monitor an electrode state or to register an ALARM condition When set to register the ALARM state the relay is energised in the system normal state and de energises when an ALARM condition exists Each relay channel also contains a delay circuit where set delays of between 0 and 23 seconds can be provided using one of four split pad links Provision is also made by split pad links to bypass each delay circuit The split pad linkage is fully covered in section 3b 3 of this chapter This option comes complete with the nylon spacers and two 8 way output sockets INSTALLATION This sub section deals with the mechanical and electrical installation of the Delay Relay Output Board PCB 24680504 option In the rest of this chapter the delay relay output board title is shortened to output board STORAGE amp PRE INSTALLATION INSPECTION
184. y unit and secure the unit to the panel The two clamps on the 24683B and 24683C each clip onto two metal studs on the case of the unit Adjust the clamps from the rear of the unit with a suitable flat bladed screwdriver Tighten the clamps until they press firmly against the panel to hold the unit in place INSTALLING THE 24683D WALL MOUNTED UNIT The 24683D Remote Display Unit is contained in an IP65 enclosure that can be fixed to the wall by four mounting brackets Cables are routed to the internal PCB through glands in the base The installation procedure is 1 Place the unit against the surface to which it is to be fixed and mark the positions of the fixing points These should be positioned on centres 190mm apart horizontally and 305mm apart vertically Install suitable fixings and secure the unit to the wall 2 Remove the four screws securing the clear cover of the unit and place the cover carefully to one side 3 Remove the four screws securing the front panel of the unit and lay the panel still attached by its ribbon cable on top of the case 4 Loosen the cable gland nuts pass the cables through the glands prepare the cable terminations and fit the cable to the terminal block See Section 4 4 4 for details 5 Ensure that the cables are not strained within the unit tighten the cable glands and refit the front panel and clear cover 24685034 Hydrastep 2468CB amp 2468CD Manual Remote Display Options 24683B C amp
185. ying conductors must be connected to each terminal Figure 4 4 Star connection example for two remote displays 24685034 4 9 Remote Dis 4 4 3 HIN 4 10 play Options 24683B C amp D Hydrastep 2468CB amp 2468CD Manual EXAMPLE OF A DAISY CHAIN SYSTEM Figure 4 5 shows two remote displays connected in a daisy chain Where more than one remote display is in use local supplies with isolated outputs must be used to power the extra unit s To prevent signal reflections from corrupting the data it may be necessary to fit termination resistors to the last unit in the chain The resistor values should match the characteristic impedance of the cable 1200 typical A termination resistor is connected between pins 3 and 4 17 and 18 on terminal block TB1 A suitable resistor to use is a metal film type SYSTEM REFERE

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