User manual F850
Contents
1. Hazardous Location Class I Group B C D a i i Class Il Groups E F G and Class III locations G nnheimer FS850U Ex px control unit G nnheimer Elektro bH Dr Julius Leberstra e 2 67433 Neustadt Explosionproof with I S Outputs Class Division 1 Groups B C D T6 Purge Type X Electric apparathus inside cabinet Page 36 1 1 Terminal exclusively for connecting the operating panel BT 851 1 2 Terminal exclusively for connecting the operating panel BT 851 1 3 Terminal exclusively for connecting the operating panel BT 851 1 4 NC 2 1 signal for all Inputs below 2 2 Input for external bypass key switch 2 3 Input for external On Off switch 2 4 Input for external alarm loop NOTES 1a Maximum distance between unit and switch contact is 10m Re 1b Maximum distance between unit and BT851 x is 10m 2 All non intrinsically safe wiring shall beseparated from intrinsically safe wiring per NEC article 500 and ANSI NFPA 70 3 All switch contacts shall be non energy storing containing no inductance or Capacitance 4 Entity Parameters Vmax 8 61 V Imax 1 93 mA Ca 0nF La 40 uH NOTES 1 Supply Voltage FS850U 0 x x 230 VAC FS850U 2 x x 120 VAC FS850U 3 x x 110 VAC 2 Relay Output Rating 16 Amps 250 VAC 7 Amps 30 VDC 3 Maximum Ambient Temperature Rat2. Enter Setpoint pressure monitor minimum Y Enter rated flow Operation mode continous flow and P Valves selected RI phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 5 Flow charts Page 30 Figure 10 Flow chart parameter category G nnheimer Elektronic GmbH End of menu gt End A On Off C Enter On Off code 4 Y Enter bypass code 4 Y V omg gt menu Enter az menu code a Sub menu Codes Figure 11 Flow chart code category phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 6 Annex Page 31 6 Annex 6 1 Tables 6 1 1 Size of orifice plate m pan nid ow EX about The right diameter of the orifice plate de pends on the desired flow rate through the 0 24 inch 6 mm 0 31 0 75 liters sec enclosure In case of digital solenoid valve 0 39 inch 10 mm 0 69 1 81 liters sec the flow rate is mainly given by the built in 0 55 inch 14mm 1 67 3 06 liters sec nozzle diameter and pre pressure 0 71 inch 18 mm 2 5 4 12 liters sec 6 1 2 Table Resulting Flow rates by Nozzle and pre pressure The air flow into the housing is a function of the pre pressure and the diameter of the nozzle The table below shows the resulting air flow by given pre pressure
3. SE d Sub Structur meru l Seren p Language 7 Sub N eg Si menu gt Language Zo A In Operation j Figure 7 Flow chart main menu G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 5 Flow charts Page 27 French D gt gt English lt End of menu gt Structur German v Sub menu Language Figure 8 Flow chart language menu G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U Va d D EN End of menu La Parameter p P PA A 5 Flow charts A och Operation mode leakage L compensation 4 Y Cont Flow Select operation mode Operation mode continuous flow A r P Ventil selected r i D Ventil selected Y nies time based purge method 4 Y Y Integra gt Select Purge method purge method purge medium integration A D Ventil selected P Ventil selected D Valve Digital valve Y Valves P Valve Proportinal valve Select valve Sub men
4. By Code 0002 e E A Code 0000 switched off Procedure gt Press the Enter button to start main menu The control unit calls for the M code to be entered The ex works M code is 0001 M Code Press the Enter button to enter M Code Display shows 0000 the far left digit is flashing Use right key to step between the digits to enter code 0001 0001 the present M Code The main menu is active now The first sub menu Language appears e on the display The default language of ex works is German To alter the language press Enter ish On the left appears the word English m e Press the Enter key to confirm n Category Structure appears Structure C G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 4 Operation Page 24 Press the Enter key to configure the Ex p system structure i The first item of the structure menu is the choice of the solenoid valve lt CU lt D u Press the Enter key to change state m The present state is digital solenoid valve g lt CU D Change the state by pressing Up key The new state is now Proportional solenoid valve S lt C lt 0 Confirm the change by pressing Enter key This item is the operational mode continuous flow or leakage com pensation The ex works state is leakage comp
5. and nozzle diameter Flow in l s p Air 1 293 g liter pre pressure pre pressure bar 100000Pa inH20 Nozzle diameter mm 1 5 2 3 4 1 5 602 2 0 7 1 2 2 7 4 9 2 802 9 0 8 1 5 3 4 2 5 1003 7 1 0 1 7 3 9 3 1204 4 1 1 1 9 4 4 3 5 1405 1 1 2 2 1 4 1605 9 1 3 2 3 5 2007 4 1 5 2 6 6 1 3 Table Plate orifice Selection Dependent on the air flow in the table 6 1 2 above it is recommended to use a minimum size of the orifice plate The table 6 1 3 is similar to table 6 1 1 The customer can choose the plate ori fice in correspondence to given pre pressure and nozzle diameter Plate orifice mm pre pressure pre pressure bar 100000Pa inH20 Nozzle diameter mm 1 5 2 3 4 1 5 602 2 min 6 min 10 min 14 min 18 2 802 9 min 6 min 10 min 14 2 5 1003 7 min 10 min 10 min 18 3 1204 4 min 10 min 14 min 18 3 5 1405 1 min 10 min 14 4 1605 9 min 10 min 14 5 2007 4 min 10 min 14 G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 6 Annex Page 32 6 2 Technical Details Control unit FS850U General Mounting inside hazardous area Ex protection class Environment protec tion Explosion proof with I S Outputs Class I Division 1 Groups B C D T6 Purged Type X NEMA 4X IP65 Dimensions Housing H x W x D 10 51 inch x 5 24 inch x 4 33 inch 267 mm x
6. electrical safety values stipulated on the type plate must not be exceeded This is also important at the intrinsically safe circuits When interconnecting intrinsically safe circuits it is to be tested whether a voltage and or current addition occurs The intrinsic safety of intercon nected circuits is to be ensured G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 2 Introduction Pressurized enclosure system F850U Page 6 2 Introduction Pressurized enclosure system F850U 2 1 Explosion protection pressurized enclosure The use of pressurized enclosures allows the operation of non explosion protected devices in hazardous areas inside division 1 or division 2 areas according to NEC 500 The protection type pressurisation is based on the principle of maintaining a constant pressure using air or a protec tive gas to prevent an explosive mixture forming near the device inside the pressurized enclo sure Before start up the pressurized enclosure must be purged with air or protective gas to remove any explosive mixture that may be inside the enclosure After this purging period the pressurized enclosure system has to monitor the pressure inside the cabinet If this pressure drops below at least 0 8 mbar the control unit switches off the line volt age to secure the devices inside the cabinet Therefore the devices inside the pressurized enclo sure have to be wired according the shut off s
7. lt 11 inch H2O Pressure set point during purg ing This pressure value will be regu lated during purging process Pressure set point during normal operation This pressure value will be regu lated during normal operation Pressure set point at under run of this value the signalling output relay opens terminals 21 22 G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Menu code Code to enter menu and leaving normal operation mode The M code could not switched of by setting M Code 2 0000 Bypass code Code to activate the bypass The bypass code can be switched off by setting 0000 The bypass code 9999 blocks the bypass function In that case a bypass can only be activated by key switch connected to intrinsically safe con nectors 2 1 and 2 2 On Off code enables switching on or off the encapsulated devices The On Off code word can be switched off entering 0000 Email info goennheimer de F850U 4 Operation Page 23 4 5 3 Configuration Example Example Enclosure volume 500 Ex p System gt Language English Structure e Operation mode leakage compensation e Proportional solenoid valve Parameters e Purging volume 2500 Minimum pressure of enclosure 0 3 inH2O 80 Pa Maximum pressure of enclosure 6 inH2O 1500 Pa Set point pressure purging process 4 inH2O 1000 Pa Set point pressure normal operation 0 8 inH2O 200 Pa Codes e M Code 0001 e
8. mode continuous flow Rated Fl Pressure monitor 3 minimum pressure Min Pres Pressure monitor maximum pressure Max Pres Set point pressure during purg R Pre Pu Set point pressure during nor mal operation Rated Pr Pressure monitor alarm pressure Sig Pr Codes Code for main menu M Code Code for bypass By Code Code to enable switching igni tion capable device On OffF C G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de
9. safe ports G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 6 Annex Page 33 6 4 Block diagrams 1 14 Control unit WEI m BT851 2 1 2 FS850U it 23 Digital valve 1 Standard valve 3 1 3 1 4 z E Digital valve 2 or fap jns e g 4 Alarm contact Option OT continous flow en LH 70 Proportional valve for pressure or flow External alarm loop M 24 La rate regulation e un EN 15161718 11121314 main working current circuit voltage Figure 12 Electrical block diagram Mech valve Orifice plate B EE E Ex p enclosure Spark lattice f Terminals on Terminals on 1 FS850U FS850U 4 23 20 i A Bra gt ARP E 4 Nozzle gt Nozzle Bypass choke Operation mode leakage compensation using digital solenoid valve Operation mode leakage compensation using proportional solenoid valve Figure 13 Pneumatic block diagram Dimensions G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 6 Annex Page 34 6 5 Dimensions Units inch mm 5 24 133 4 09 104 Angle adapter for 90 turned mounting available optionally 1 352 Drilling template 1 34 in
10. the pressurized en closure 3 2 2 Protective gas system The protective gas shall be essentially free of contaminants or foreign matter and shall contain no more than trace amounts of flammable vapour or gas All protective gas supplies shall be designed to minimize changes for contamination Air of normal instrument air quality nitrogen or other non flammable gas shall be permitted as a protective gas Piping for the protective gas shall be protected against mechanical damage Where compressed air is used compressor intake shall be located in an unclassified location Where the compressor intake line passes through a classified location it shall be constructed of non combustible material designed to prevent leakage of flammable gases vapors or dusts into the protective gas and protected against mechanical damage and corrosion The electrical power for the protective gas supply Blower compressor etc shall be supplied ei ther from a separated power source or from the protected enclosure power supply before any service disconnectors to the protected enclosure Where double pressurization is used the protective gas supplies shall be independent 3 2 3 Power equipment Enclosures containing power equipment shall be substantially non combustible construction and shall be reasonably tight Gaskets shall be permitted 3 2 4 Type X Pressurizing No valves shall be permitted between the cutoff switch and the protected enclosur
11. 1 and 2 2 phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 4 Operation Page 20 4 4 Information during normal operation The FS850U can give several information to the user during different sates of operation via the LC display You can choose between the following information items state current pressure flow rate or remaining purge time indication using the down INFO button see figure below Remain purge volume time indication KL Jam Flow rate indication o E Pressure indication P 0 8m bar Info Nn PU d Ready A Bypass P lt P min Purging Gm On On gt Language Le lt gt Normal mode Bypass mode Operation Main menu Figure 6 Flow chart states of purging system and corresponding display 4 5 Configuration To achieve an application specific mode of operation the control unit FS850U has to be config ured entering the following parameters All parameters of the control unit are structured in form ofa menu See also the flow charts in chapter 5 4 5 1 The menu structure Main menu The main menu is separated into 4 categories e Language e Structure e Parameters e Codes Language The standard device contains the followin
12. 133 mm x 110 mm Material Aluminum lacquered light grey RAL 7035 Electrical Power consumption About 2 5 VA without peripherals specifications Main voltage Working circuits Terminal 11 12 13 14 Control circuits Plugs for peripheral components Howraterange 0 14 4 17l s dependent upon orifice plate size Mounting Position Position independent only intake and outlet of the control unit 10 50 at T6 10 C 60 C at T4 5 95 non condensing LC Display menu guided Different languages German English French Dutch Spanish 110V AC 120V AC 230V AC 8 62 Hz U x 250VAC lt 16A at cos o gt 0 7 Ux30VDC Ix7A Px150W DC Ex protection class intrinsically safe see declaration of conformity in UL certificate for further details Environment tem perature Be Exp Parameter input Configuration Parameter storage by EEPROM double saved with CRC 6 3 Intrinsically safe ports Intrinsically safe inputs and outputs Terminal Voltage Uo Current Io Power Po Co Lo Comment 1 1 8 61V 51mA 108 4mW 100nF Supply BT851 40uH 1 2 8 61V 51mA 108 4mW 100nF Data BT851 40uH 1 3 Gnd BT851 2 1 Power supply 22 8 61V 1 93mA 4 16mW OnF 40uH Bypass Input Ext Q gt min 2 3 8 61V 1 93mA 4 16mW OnF 40uH On Off Input Ext P gt min 2 4 8 61V 1 93mA 4 16mW OnF 40uH External alarm input Ext P gt max Table 2 Intrinsically
13. 54 inch 39 mm k 3 15 inch 80 mm Adjustable choke by NPT 1 2 leakage compensation 16 5 mm G3 8 Drill diamenter 3m wire Maximum pressure 6 bar l de ti flow oval n operation mode continuous flow using 2 valves 1 4 1 26 k 1 26 32mm K 1 93 49 mm 5 is the choke absent Figure 18 Dimensions digital solenoid valve Figure 19 Dimensions proportional solenoid valve G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 6 Annex Page 35 6 6 Shut off schematic If this pressure drops below at least 0 8 mbar the control unit FS850U switches off the line volt age to secure the devices inside the cabinet The shut off of the ignition capable devices has to be done on both wired Outer nad neutral according the schematic below Ex px hosing FS850U Line voltage Ignition capable Outer o devices Neutralo Do not exceed the maximum switching power of FS850U relay contacts in technical details table in section 6 2 G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de 6 Annex F850U 6 7 Control drawing External Ex i switch 2 2 Bypass 2 4 Alarm loop 2 3 On Off BT851 0
14. D uunsnssssnnnnaannnnnnnnnnnnnnnnnnunnnnnnnnnnnnnannnnnnnnnnnnnnnnnnnnnannnnnnnnnn 11 Sel OlassifICatiOn corio cte ee He eti A Ri t ebat Do ne aate eR LR pod E daa gato 11 3 2 General requirements according to NFPA A6 11 3 2 1 EDGIOS HM EE 11 3 2 2 POLSCtIVE GaS EE 11 3 2 3 POWER SCUIDIM SIM EIE 11 3 2 4 Type X EE La e BEE 11 CC Sein re DE 12 3 3 1 Gontrol unit ES850LJ 3 2 indo m ange RU RR X ERR E ere eaa ue 12 3 3 2 Operation only with nozzle without solenoid valve ssesssessesissresiesississtnstrrrssrinstnssrnnstnnsnnsnnne 12 38 8 En ee REI 13 3 3 4 Operator panel EM WEE 13 3 3 5 Pro t ctive gas suUppIV NEL Em 13 3 4 Connecting and Commtssoning ener ennt inttr enne sinn s nnne nnns inneren 14 3 4 1 Intrinsically safe connectors of FGGbOLT seen nennen nnne nnne nnne nes 15 3 4 2 Connection table FS850U and DW 15 3 4 3 Power terminals of FS850U esee entente nennen rr inttr en rns nensi tnne trennen 16 2 5 Default parameters ce edere doter ba dentes eta i rasta cae Edge EEN X eeu ELE atu Rapt Seta pado 16 3 5 1 pce EE 16 3 6 Automatic Purging prOCOSS eorr idi toti ee ioter rettet cay tbe reet ar anda De pron ESAT SKEA ned ae esa ap a defun 17 Bef MAMONA E mee 17 3 9 EE 17 4 OPERATION vr 18 4 1 Nei EE 18 4 2 Keyboards iesu RE n e a ex seed n iude dis need x aiibi eee 18 4 3 How to enter and leave the bypass mode 19 4 4 Information during normal operaton enne nennen nnne enn rrs ensi nn
15. User s manual Pressurized enclosure system F850U Ex px purge control unit Explosionproof with IS terminals Class I Division 1 Groups B C D T6 Purge Type X WARNING PRESSURIZEDENCLOSURE A manual rev 1 ee D Dr Julius Leber Stra e 2 G nnheimer 67433 NeustadUWeinstrafie i 67408 Neustadt Elektronic GmbH phone 49 6321 49919 0 http www goennheimer de Email info goennheimer de Ze Reg Nr Q1 0297038 fax 49 6321 49919 41 F850U Table of contents Page 2 Contents E 1 1 1 5 7 1 e e 4 1 1 General safety ouidelines AA 4 1 2 Safety Guidelines for explosion proofed devices cccceececeeeeceeeteeeeneeeeeeeeseaeeeeaaeeeeaaeseeeeeseaeeeteaeeeeeeeeeeeess 5 2 INTRODUCTION PRESSURIZED ENCLOSURE SYSTEM F850U esee 6 2 1 Explosion protection pressurized encdosure enne enne trn 6 2 2 Pressurized enclosure system F850U sse enne enne en netten nennen sinn nennen nnns 6 2 2 1 F850U operation without solenoid valve ssssessseseeenennnnen ennemis 6 2 2 2 F850U operation using a solenoid valve eene nennen enemies 7 2 2 3 Integrating versus time based purging method 8 2 2 4 Pressurization using Continuous flow sssssssssssseses ener en rennen 9 2 3 Penpherals dieat He eee He tup i ee fu Cape eed due te el eee ate ad 10 3 INSTALLING THE UNIT GETTING STARTE
16. arm loop 3 4 2 Connection table FS850U and DW812 To achieve separate monitoring of two cabinets using an additional pressure monitor DW812 Intrinsically safe connector 2 on FS850U Terminals on DW812 Be G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 3 Installation Page 16 3 4 3 Power terminals of FS850U 11 12 Working current circuit 1 Line voltage neutral conductor Line voltage outer conductor at AC Terminals for proportional solenoid valve Terminals for additional digital solenoid valve 2 Terminals for digital solenoid valve 1 3 5 Default parameters The following parameters are preset after connecting the FS850U to mains supply for the first time or after a reset of the control unit Structure Mode leakage compensation Type of valve proportional External DW812 No Pressure Purging volume l l l and Min flow while purging Shut down value for integration Min pressure inside enclosure 3i Shut down values limits for pressure flow Max pressure inside enclosure inside housing Set point pressure while purging Set point pressure while operating Signal pressure Only at optional signalling contact Main menu M Code The setting 0000 disables the code Bypass By Code protection not possible at M Code On Off Code On Off C The setting 9999 disables bypass button at FS850U and BT851 3 5 1 Reset O Hold red button ENTER Button down while poweri
17. ch 34 mm 0 94 24 i Ex p enclosure 4 Mounting outside Ex p enclosure 417 406 Drilling template 1 34 inch 34 mm and 0 22 inch 5 5 mm D 5 4 N so Y Nozzle see table Drilling template see table in Atmosphere oo z pressure LC Screw connection y see table in attachment al E N u Ld N 3 4 NPT 3 Mounting inside Ex p enclosure 5 04 128 433 dio Figure 14 Dimensions FS850U Figure 15 Mounting examples 4 72 inch 120 mm 2 3 inch 58 5 mm lt gt 0 21 inch 5 25 mm Ze 0 2 inch 5 mm 4 17 inch 106 mm 1 06 inch 27 mm 0 17 inch 4 2 mm men T LS CLASS DIV 1 1 EA ere dre LN on off S 3 15 inch 80mm 2 6 inch 60mm G nnhelmer Elektronic GmbH E E o Es 2 p o E 10 T e wtextis sp 5 10 BT851 5 2 46 inch 62 5 mm 1 54 inch 39 mm 0 69 inch 17 5 mm 0 28 inch 7 mm 2 36 inch 60 mm 4 45 inch 113 mm 4 72 inch 120 mm Figure 16 Dimensions and template BT851 0 Figure 17 Dimensions and template BT851 5 1
18. chematic in section 6 6 2 2 Pressurized enclosure system F850U The pressurized enclosure system F850U contains at least the control unit FS850U and an inlet nozzle or solenoid valve The FS850U can be mounted in or outside the enclosure Furthermore an operator panel is available for remote control It is also possible to connect intrinsically safe peripherals e g temperature pressure sensors switches to the control unit FS850U The pressurized enclosure system F850U can be configured in different modes The following table gives a survey Only nozzle no solenoid valve Using solenoid valve and nozzle in line Manual mode Simple mode Automatic mode Pressure control mode Manual operated Simple inlet nozzle D solenoid valve P solenoid valve valve Table 1 Survey of operation modes 2 2 1 F850U operation without solenoid valve 2 2 1 1 Simple mode Pressurization The easiest way is to have only a nozzle at the inlet of the cabinet So a permanent airflow through the cabinet is achieved and after the programmed amount of air has passed the cabinet the control unit enables the output contacts The disadvantage of this solution is the constant high usage of compressed air or protective gas 2 2 1 2 Manual mode Pressurization This configuration uses two nozzles and a manually operated valve The small and the bigger nozzle are mounted in parallel and the valve is used to shut the bigger nozzle off S
19. delines and NEC 500 516 For Class Groups B C amp D Conduit Seals are required within 18 If the FS850U is mounted inside the enclosure this con Caution duit seals are also required 3 3 2 Operation only with nozzle without solenoid valve The inlet nozzle has to be mounted into a drilling into the pressurized housing using a counter nut with a protective gas supply adapter It is not allowed to mount the nozzle on a bushing inside the pressurized enclosure enclosure skin amp g Drilling 0 66 16 8 counter nut 1 18 30 jd o nozzle eg N LR pipe connection 8x 1 mm Figure 3 Mounting the nozzle into the housing inch mm Please see table in section 6 1 2 to choose the adapted nozzle diameter to your system G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 3 Installation Page 13 3 3 3 Solenoid valves Mounting position of solenoid valve is free It can be mounted inside or outside the cabinet For mounting hints see additional manufacturer s guide of solenoid valve O The solenoid valve is not part of the UL Classification Note 3 3 4 Operator panel BT851 The operator panel BT851 0 can be integrated directly into the enclosures outer skin The BT851 5 has a separate housing for mounting on a plate or wall For location and drill sizes see Figure 16 Dimensions and templat
20. e Equipment such as motors or transformers that may be overloaded shall be provided with de vices to detect any increase in temperature of the equipment beyond its design limits and shall de energize the equipment automatically For ventilated equipment the flow of protective gas shall provide sufficient cooling even during overload conditions or the equipment subject to overloading shall be provided with devices to de G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 3 Installation Page 12 tect any increase in temperature beyond its design limits and to de energize that equipment automatically 3 3 Mounting 3 3 1 Control unit FS850U The control unit FS850U can be placed directly inside hazardous area The location inside or outside the enclosure as well as the position is variable and can be fitted to customers specific requirements If possible arrange the in and outlet of the control unit on a horizontal axis See also Figure 15 in the Appendix The control unit can be fitted to the cabinet or to a mounting plate using the 4 integrated rear sided fixing points In most applications the FS850U is fixed using the 1 inch screw connection of inlet or outlet O The solenoid inlet valve s or inlet nozzle should be mounted as l far away from the control unit FS850U as possible to achieve safe purging E g diagonal arrangement see Figure 15 Note Watch local safety gui
21. ensation So skip this item by pressing the Up key O O sin z The structure menu is now finished The main menu automatically con m tinues with the pre selected parameters St g Start the parameter category by pressing the Enter key Ki The first menu item Purging volume appears C 5 lt e Press the Enter key to enter the desired volume of 2500 l To enter 2500 use the input sequence as follows Ve Confirm the input by pressing the Enter key e sl M FI P The minimum flow while purging can be increased for special applica In Fir tions In the sample the default value should be kept The desired minimum pressure of 0 3 inH2O 80 Pa is already ad M In Pres justed ex works Continue skipping this menu item by pressing the Up key or indicate it by pressing the Enter key M P Now enter the desired value for the maximum pressure Modify the aX rres present parameter as shown above G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 4 Operation Page 25 4 inH2O The desired maximum pressure is 4 inH2O 1000 Pa The desired set point pressure during purging process of 4 inH2O is R Pre Pu already adjusted ex works Continue passing this menu item by press ing the Up key The desired set point pressure during normal operation must be ad Ra ted Pre justed Modify the presen
22. es of BT851 in annex 3 3 5 Protective gas supply The costumer has to supply restricted or regulated pre pressure to the inlet nozzle Please see table in section 6 1 2 to choose the adapted nozzle diameter pre pressure to your system G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 3 Installation Page 14 3 4 Connecting and Commissioning After mounting the FS850U connect the power supply lines the valve lines and other non intrin sically safe lines to the terminals 11 24 into the explosion proof enclosure of the control unit FS850U HIGH VOLTAGE Beware of high voltages and currents when handling this device or power lines Electric shocks can injure or kill Warning Ensure your installation is compliant to the following NEC 500 516 certification and description documents of FS850U Do not exceed terminal safety limits of each terminal Caution See limits in technical details or declarations of confor mity FOR CLASS I GROUPS B C amp D CONDUIT SEALS ARE REQUIRED WITHIN 18 Caution 1 44 Control unit WEI u BT851 2 12 FS850U Hl 23 Digital valve 1 Standard valve 3 ie Ex em ib IIC T6 22 Digital valve 2 _ additional valve by Alarm contact continous flow 2 1 Bypass key switch 2 2 20 P rtional val for pressure or flo
23. ety standards The electrical data on the type plate and if applicable the special conditions of the test certifi cate of UL of the FS850U have to be observed For outdoor installation it is recommended to pro trol system against direct climatic influence e temperature is 140 F 60 C at T4 if not stipulat hazardous area and refer to UL certificate the explosion protected distribution and con ith a protective roof The maximum ambient therwise please note temperature classes of Terminal compartment in explosion proof housing YEx d When closing the explosion proof housing plea nsure that all gaskets of the housing remain effective and that all threads are in proper Z Keep the explosion proof box of the system always completely closed during normal operation and secure the top cover against loosening Unused entries at the explosion proof housing have to be closed with adequate and certified blind plugs which are secured against self loosening and turning Maintenance Work The gaskets of all parts of the housings have to be checked for damages and replaced if re quired Terminals have to be tightened correctly Possible changes in colour point to increased temperature Cable glands stopping plugs and flanges have to be tested for tightness and se cure fitting Intrinsically Safe Circuits Installation instructions in the testing certificates of intrinsically safe apparatus have to be ob served The
24. fety and offers an improved operator access when the FS850U control unit is mounted inside the cabinet The operator panel BT851 indicates operation and malfunction status as plain text via LC display Four front sided push buttons offer total command of the FS850U unit Status momentary pres sure flow rate as well as remaining purge volume time are available The connection to the con trol unit is based on serial communication using only 3 wires max distance 20m G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 3 Installation Page 11 3 Installing the unit Getting started This chapter contains important steps for mounting connecting and starting 3 1 Classification The UL has classified the FS850U for use in Class I Division I Groups BCD and it is a Type X system through NFPA 496 3 2 General requirements according to NFPA 496 3 2 1 Enclosure The protected enclosure including windows shall be constructed of material that is not likely to be damaged under the conditions to which it may be subjected Precautions shall be taken to protect the enclosure from excessive pressure of the protective gas supply In Division and Zone locations where the conduit or raceway entry into a pressurized enclo sure is not pressurized as part of the protective system an explosion proof conduit seal shall be installed as close as practicable to but not more than 450mm 18 in from
25. g languages e German English French Dutch Spanish Structure The purge system structure can be selected as follows Operation mode leakage compensation or continuous flow Valve type digital or proportional solenoid valve Purge method ntegrating or time based Optional pressure monitor DW812 installed Yes or No G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 4 Operation Page 21 Parameters This category contains the necessary parameters depending on the de fined structure above Examples for parameters are e Purging volume time Minimum flow while purging process Minimum pressure Maximum pressure Signal pressure Codes The control unit has 3 different code words e M Code to enter main menu e By Code to activate Bypass e E A Code to switch encapsulated components on or off O The FS850U enters stand by mode while running menu II structure That means the solenoid valve is closed and the encapsulated components are switched off Note 4 5 2 Description of the menu items The display of the control unit contains 8 digits All names of structures and parameters will be shown in clear text or abbreviations The table below shows some explanation of the menu items The table can be used as a refer ence guide for programming the FS850U correctly See also corresponding flow charts in section 5 Hierarchy 1 Level 2 Level 3 Level Description Explanation Selecting valve
26. ing Ta 50 C T6 Ta 60 C T4 4 Control equipment must not use or generate more than 250 V rms or dc with respect to earth FS850U x x x Zertifiziertes Qualit ts Managementsystem p nach WEN iso gf G nnheimer Elektronic GmbH http www goennheimer de Email info goennheimer de Figure 20 Control drawing F850U 901 G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Dr Julius Leber Stra e 2 67433 Neustadt Weinstra e Postfach 10 05 07 67405 Neustadt phone 49 6321 49919 0 fax 49 6321 49919 41 Rev A 11 2006 Email info goennheimer de F850U 6 Annex Page 37 6 8 List of Parameters FS850U Production no Solenoid valve BT851 Yes No Inputs Description cmm Value state Language ZZ language Structure Valve nM valve type used with this purging system Va a we P valve D Valve Ces box additional Use of an additional DW 812 Ze box Purging Time based purging method ca Integ N or integration purging Integra DEE N ee N Q Q method Integ Y Operational Continuous flow C flow Y or P mode CH compensation C flow C C Flow Y h C Flow N m Q Parameters Purge time Pur Pur Time Purge volume Pur vol Vol Minimum flow rate during purg S ing procedure Min Fl P Minimum flow rate during nor s mal operation by op mode M in Fl O continuous flow Set point flow rate by operation
27. king solenoid valve SVP technique 2 2 2 1 Automatic mode Pressurization digital solenoid valve technique While purging the SVD is activated and a large amount of purge medium flows into the enclosure through a nozzle with a large cross section After purging the control unit turns off the SVD The leakage compensation is done by a bypass choke with a very small adjustable cross section diameter 12 mil 0 3 mm up to 40 mil 1 mm inside the valve The protective medium flowing into the enclosure is adequate to maintain a pressure of at least 0 3 inH2O 80 Pa The pressure is monitored by the control unit FS850U by a proportional working pressure sensor The maxi mum and minimum pressure of the enclosure is programmable within the configuration menu Tl If leakage losses grow up e g by aging of cabinet s seals and cannot be compensated by the bypass the enclosure is shut down Note The FS850S works in automatic mode with time based purging method as well as with integrating purging method These methods are illustrated in section 2 2 3 2 2 2 2 Pressure control mode Pressurization proportional solenoid valve technique The internal proportional working pressure sensors also allow the use of a proportional solenoid inlet valve This valve is used as the actuator of a digital working FS850U PID control loop for the inner pressure of the cabinet The benefits of pressure feedback control are 1 Dramatica
28. lly decreased consumption of purge gas 2 Increased availability of the application based on constant pressure inside Ex p housing higher leakages e g by aging of gaskets etc will be compensated gt Adaptive compensation of leakage losses of the Ex p encapsulation 3 Minimization of streaming noise 4 Easy adjustment of pressure levels to specifications of Ex certificate Further advantages are 1 Exact regulation of pressure also during purging phase 2 By defined pressure inside cabinet pressure sensible parts like foil keyboards windows etc will not be damaged G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de 2 Introduction Pressurized enclosure system F850U Page 8 F850U Increased system availability by PID controlled cabinet pressure Pressure sensitive parts e g windows front foils will be saved Note 2 2 3 Integrating versus time based purging method For purging in automatic mode see section 2 2 2 1 a conventional time based as well as an improved integrating purging method integration of real flow are available Using the conventional method the purge quantity is based on the product of a monitored minimum flow rate at the enclosure outlet and time The flow rate depends on the size of the valve s nozzle diameter 40 mil 1 mm 240 mil 6 mm and supply pressure This has to be calculated using a formula or a pressure nozzle diagram The c
29. ng on the FS850U to reset all parameters to default values in table 3 5 Note The Reset can not be made using the BT851 G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 3 Installation 3 6 Automatic Purging process The control unit FS850U starts the purging process immediately after start up if the minimum pressure of 0 3 inH2O 80 Pa can be built up inside Ex p cabinet Page 17 Minimum pressure and minimum flow rate will be monitored simultaneously to ensure a safe purging process If the purging flow rate drops below its minimum e g temporary interrupt of air supply or tempo rary shut of the outlet the purging process will be interrupted and the control unit continues purging after the disturbance is removed If purging pressure exceeds the min or max limits the purging process will be terminated and the control unit will restart with a new purging process automatically after achieving purging conditions The table below shows the minimum flow rate in accordance of the used orifice plate Orifice plate in control unit 0 16 inch 4 mm 0 24 inch 6 mm 0 39 inch 10 mm 0 55 inch 14 mm 2 0 71 inch 18 mm Monitored minimum flow rate 0 1 liters sec 0 2 liters sec 0 4 liters sec 0 9 liters sec 1 3 liters sec 3 7 Maintenance Depending on the cleanness of the used purging gas the pneumatic inlet and ou
30. ns trennen 20 E ee le IIe EE 20 4 6 X Alarm and malfunction indications ener sienten trenes rss nnns en nnne 25 S F OM CHAR O PEE 26 P ANNER EES EA BET leese E EE A 31 6 1 1 Size of orifice Plate EE 31 6 1 2 Table Resulting Flow rates by Nozzle and pre pressure enne 31 631 3 Tables Plate orifice Selection sisi ocn rc tete tei ete lee tr 31 6 2 Technical EE UE 32 6 3 intrinsically safe TEE 32 6 4 Block diagrams e e e t ei eei e le Re edle leas ck ever eoo ed Cede EE Een Rn 33 06 5 BImenslors iit ete ec e tee n tectis cote te deal ide M eu tee beue rue DR no ue Re toe 34 6 6 Sh toff schemaliCu EE 35 6 7 Oontrol el Te DEE 36 6 9 List o Paramelters e etae eter ebd eee C ede d i ee cedet aside d aD naa clerus 37 G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U Device overview Table of contents Page 3 1 Intrinsically safe connector BT851 2 Intrinsically safe connector Peripherals 3 Housing Intrinsically safe control unit pneumatic devices 4 Connector reference pressure environment 5 Purge gas outlet 6 LC Display 7 Purge gas inlet 8 Push buttons 9 Explosion proof housing Clamping power section 10 Earth connection 11 Solenoid valve fuse 12a Terminals 11 18 12b Terminals 19 24 13 Thread
31. o for purging the valve is opened by the operator a huge stream of air is flowing through the cabinet and purges it After the programmed amount of air has passed the cabinet and the control unit has enabled the output contacts the operator can close the valve So only a small stream of air is en tering the cabinet trough the small nozzle to maintain the required overpressure The advantage of this method is that after purging the airflow is limited by the small nozzle and the use of purge medium over time is much lower than it would be without valve see 2 2 1 1 G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 2 Introduction Pressurized enclosure system F850U Page 7 2 2 2 F850U operation using a solenoid valve This configuration is nearly the same as the one in section 2 2 1 2 only the manually operated valve is replaced by a solenoid valve operated by the control unit So the change between small and big nozzle is done automatically The advantage of this is the operator free operation of the system After power up the control unit will purge the cabinet close the solenoid valve afterwards and maintain the overpressure in the cabinet through the small nozzle After purging the control unit FS850U holds the pressure inside the enclosure at a minimum of 0 3 inH2O 80 Pa Two different solenoid vale techniques are available digital working solenoid valve SVD technique or proportional wor
32. onventional purging method using a digital valve has a considerable disadvantage During purging phase and also while normal operation a constant rate of protective gas is needed For getting system availability the inflow rate has to be selected bigger than the leakage losses of the enclosure Q Inflow volume leakage losses of cabinet gt preselected minimum flow rate Wastage of protection gas will pollute environment and cause high costs dur ing application s life time A1 A2 considered purge gas volume with z integrating purge method D A2 unconsidered purge d gas volume wastage Minimum A1 considered purge gas flow volume at conventional time based purging QN E BEZ Eid QM E P P Prepressure at valve min max Figure 1 Wastage of protective gas by detection of flow threshold and fixed purging time 2 Using the improved integrating purging method the FS850U unit measures the real flow rate at the enclosure outlet and integrates the signal to get the real purged volume Addi tionally a minimum flow rate is monitored to ensure a safe purging phase If the flow rate sinks below the minimum the integration will be stopped and continues automatically by rising above the minimum G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 2 Introduction Pressurized enclosure system F850U Page 9 Q Increased inflow volume into
33. s inch NPT for cable gland conduit G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U Safety Guidelines Page 4 1 General The symbols WARNING CAUTION NOTE This symbol warns of a serious hazard Failure to observe this warning may result in injury death or the destruction of property Warning This symbol warns of a possible failure Failure to observe this caution may result in the total failure of the device the system or even the whole application to which it is connected Caution 1 This symbol highlights important information Note 1 1 General safety guidelines To ensure safe and reliable operation the notes and warnings contained in this manual must be observed Caution this device uses mains voltage Failure to observe these warnings may result in serious personal injury or damage to property Warning The commissioning of this device may only be carried out by technically qualified personnel who must observe local safety regulations Attention Follow regulations for handling and installation of explosion proof devices in hazardous areas G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 2 Introduction Pressurized enclosure system F850U Page 5 1 2 Safety Guidelines for explosion proofed devices Application and Standards This instruction manual applies to explosion protected control systems of type of protec
34. s specifies weather Structure Va lve S P Va lve a proportional solenoid valve or a digital solenoid valve is con D Va lve nected Integrates an additional pressure DW Ext Y monitor DW812 to the purging sys tem DW 812 Yes DW 812 No DW Ext N No additional pressure monitor is used Integra Integ Y Integ N Continuous Flow Yes Cont Flow C Flow Y Activates the operation mode con tinuous flow Continuous Flow No Flow N Activates the operation mode leak Integration Purging method No Selects time based purging method Integrating purging method Yes Chooses integrating purging age compensation BE Et Purge time Enter a fixed purge Param Pur Time time in h min sec The purge time only appears if the time based method G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 4 Operation Page 22 purging method is chosen Purge volume Enter a fixed vol ume in litres The purge volume only appears if integration purging method is chosen e g 5 x cabinet volume Minimum flow rate during purging phase Minimum flow rate during normal operation only at continuous flow Flow rate set point t operation mode continuous flow this flow rate will be regulated while normal operation Minimum pressure inside enclo sure Only values above 2 0 3 inH2O can be entered Maximum pressure inside enclo sure Maximum pressure
35. t parameter to 0 8 inH2O 200 Pa as shown above The parameter setting is completed now The main menu continuous e O d es automatically with the sub menu codes Modify M Code to 0001 as shown above Please note the M Code M Code cannot be set to 0000 Set the on off code to switch the encapsulated devices on or off to On Off C 000 This code is disabled from now on Modify bypass code to 0002 as shown above Code The main menu settings are now completed End gt After pressing the Enter key the purging system is ready for opera tion 4 6 Alarm and malfunction indications The external alarm occurred i e the If the external alarm loop is not external alarm loop is broken or acti used disable the external alarm vated by an additional safety device loop by a shorting bridge Error message Cause Remedy E E EEPROM Read Error Restart the FS850U If the error Ore Stored configuration data is incom emains the unit has to be plete or corrupt checked by manufacturer G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 5 Flow charts Page 26 5 Flow charts 4 A Y Seck za End bach P Operation 4 Y Codes E d Sub B gt menu Xe Codes E 4 A Param m a Sub i Se Ss gt menu wo 4 A
36. ted to the separate inputs of the FS850U The pressure monitor will be installed like a control unit as a purge medium drain on the second cabinet For this the DW812 has to be connected to the intrinsically safe plug connector 2 of the control unit FS850U see chapter 3 4 1 and has to be initialized into it s configuration menu See the schematics in Figure 2 0111213 F2 M monitored Loi flow rate 1 2 Caption Connection table Ne d FS850U and DW812 a FS850U DW812 we Ex i Plug2 terminals FS850U 2 1 3 Fi 2 2 0 monitored flow rate Prop Veurge 5 Valve1 valve V 21 22 19 20 Purge 1 e Solenoid valve 2 Solenoid valvel 1 Ex p cabinet 2 Ex p cabinet 1 Figure 2 Monitoring of two Ex p cabinets The purging time respectively purging volume of both enclosures can be calculated and entered separately By reason of principle the integrating purging method as well as the PID controlled cabinet pressure cannot be used at the cabinet monitored by the DW812 2 3 2 Operator panel BT851 For the control unit FS850U an optional operator panel for remote control and visualization is available The panel is based on the explosion protection class intrinsically sa
37. the cabinet automatically leads to a shortening l of time for purging when using the integrating purge method Not This fast and efficient purge method enables shortest start up times ote 2 2 4 Pressurization using Continuous flow All modes above support also the operation mode continuous flow This operation mode is used for so called containment systems where flammable gases or liquids will be emitted into the inner of the cabinet during normal operation e g at analysers After the purging phase a continuous PID controlled flow rate will be kept during normal opera tion This continuous flow rate is used for thinning flammable gases or vapours below their lower explosion concentration In Continuous flow operation mode an adjustable minimum flow rate additional F850U parame ter will be monitored by purging and in normal operation G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 2 Introduction Pressurized enclosure system F850U Page 10 2 3 Peripherals 2 3 1 Additional Pressure monitor DW812 Separate monitoring of two cabinets using an additional pressure monitor DW812 The FS850U is able to monitor two different cabinets separately and simultaneously This appli cation can be used e g at analyzers using two different purge mediums The first enclosure is monitored by the FS850U itself the second enclosure is monitored by the pressure monitor DW812 connec
38. tion types below This apparatus is only to be used as defined and meets requirements of NEC500 516 It can be used in hazardous locations which are hazardous due to gases and vapours according to the explosion group and temperature class as stipulated on the type label When installing and operating the explosion protected device as well as its periphery the respective nationally valid regulations and requirements have to be observed General Instructions Work on electrical installations and apparatus in operation is generally forbidden in hazardous lo cations with the exception of intrinsically safe circuits In special cases work can be done on non intrinsically safe circuits on the condition that during the duration of such work no explosive at mosphere exists Only explosion protected certified measuring instruments may be used to en sure that the apparatus is voltage free Girounding and short circuiting may only be carried out if there is no explosion hazard at the grounding or short circuit connection The control unit has to have a back up fuse as stipulated The mains connection must have a suf ficient short circuit current to ensure safe breaking of the fuse To achieve an impeccable and safety device operation please take care for adept transportation storage and mounting as well as accurate service and maintenance Operation of this device should only be implemented by authorised persons and in strict accordance with local saf
39. tlet parts of the FS850U as well as the solenoid valve and optional DW812 have to be checked regularly for pol lution by e g oil dust etc or corrosion to ensure a safe work of the application 3 8 Repairs Warning omer G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Repairs or maintenance at the FS850U or its peripheral parts may only be done by G nnheimer Elektronic Email info goennheimer de F850U 4 Operation 4 Operation Page 18 The user can interact with the FS850U purge control unit via the four front sided push buttons and LC display respectively by using the external operator panel BT851 4 1 Display The built in display indicates menus operation modes present pressure or flow rate data as well as malfunction 4 2 Keyboard The four front sided keys have different functions depending on the present mode of operation Key Mode Function On Off normal operation Toggles the cabinet s electronic devices on and off if fA purging system state is ready bel Shift right running menu Shift cursor one position to right button BYPASS normal operation Activates Bypass Up button Only for maintenance of the cabinet Only allowed if no hazardous atmosphere is present Warning running menu Get menu next item INFO P Q T normal operation Changes information shown on the display present pres sure flow rate remaining purge time respectively purge Y
40. u Structure E Figure 9 Flow chart structure category G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 WI o Endof N menu v Language NL SE Page 28 Email info goennheimer de F850U Operation mode leakage compensation zu selected Enter minimum flow during operation mode A 4 Operation mode continous flow selected Purge method medium integration selected Enter minimum flow during purge mode Time based purge method selected gt D A Pur Time Pur Vol Enter Enter purge time purge volume Y time based Purge method Y Purge method medium integration selected N selected wen SE P NC x Endof Sub N f menu N menu gt Structur Parameter j d E CONO A G nnheimer Elektronic GmbH 5 Flow charts Page 29 Enter Signal pressure A Enter rated pressure during operation mode T Y Enter rated pressure during purge mode Enter rated pressure during purge mode Operation mode continous flow and A Y P Valves selected else P Valves selected else Enter Setpoint pressure monitor maximun T v
41. volume and present state of the purging system Down button running menu Get previous menu item MENU normal operation Enter or leave menu Enter bution running menu Initiates and confirms parameter input G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 4 Operation Page 19 4 3 How to enter and leave the bypass mode Warning By CODE 0002 E D G C D Olo ke Leaving of bypass m Only for maintenance of the cabinet Set bypass only if no hazardous atmosphere is present inside or around the cabinet The bypass mode is denied if it is possible that an explosive atmos phere can arise inside the Ex p cabinet e g at containments sys tems It is possible to enter bypass mode in each operation sate of the control unit The origin state is normal operation Press Up button Enter the bypass code using the up down and shift right button The ex works bypass code is 0002 Confirm the right bypass code using the ENTER key The bypass mode is now active If the control unit is set to automatic on the display toggles between by pass and On and the relay contacts Terminals 11 12 and 13 14 are closed ode is done by the same procedure Alternative to the use of the push buttons the bypass mode can be called by using a key switch between intrinsically G nnheimer Elektronic GmbH safe connector 2
42. w Ee 54 S CC nee 777 rate regulation Z Valve fuse control circuits terminal 1 10 t intrinsically safe y y d 15161718 11121314 main working current circuit voltage Figure 4 Block diagram FS850U Q If an external key switch is used for enabling the bypass function it can be helpful to set the bypass code at the FS850U to 9999 to prevent a secondary bypass function by bypass code from the control unit The external key switch for the bypass function has to be connected to termi Note nals 2 1 and 2 2 of the FS850U G nnheimer Elektronic GmbH phone 49 6321 49919 0 fax 41 Email info goennheimer de F850U 3 Installation Page 15 O It is possible to switch on and off the internal devices of the cabinet using the On Off key at the FS850U control unit or at the BT851 operator panel If this function should not be used it is possible to short cut terminals 2 1 and 2 3 of the FS850U to enable an automatic power on after purging phase In this case the On Off buttons at the control unit FS850U and BT851 are Note disabled 3 4 1 Intrinsically safe connectors of FS850U fa aX 2 4 Wa LS Sch o 0 Figure 5 Intrinsically safe connectors of FS850U socket on FS850U FS850U BT 851 Description Terminals exclusively for connecting the operating panel BT 851 NC signal for all Inputs below Input for external bypass key switch Input for external On Off switch Input for external al
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