PC-250B Vital Code Following Relay
Contents
1. Lee J RES 12V 280HM5 MAGNET SUPPLY s CHARGER a SW 2 ori oo i SW 3 Figure 4 1 Circuit for Charging and Aging Permanent Magnets 2 Place the permanent magnet on the pole pieces so that the desired polarity of the magnet agrees with the marking on the magnet charger Switch 2 should be in the N position and Switch 1 should be closed to the position to by pass the meter SM 4570 Rev 1 February 1995 4 5 Cc al Shop Maintenance Y AnsaldoSTS 3 To charge the magnet to full strength Switch 3 should be closed for one second and then opened for one second and this procedure repeated until three closures of the switch have been made always ending with the switch 3 in the open position This procedure is called charging the magnet to full strength Magnet Aging and Calibration 1 To age or calibrate the magnet to some lower value first make sure that Switch 3 is open then with R set at maximum resistance value close Switch 1 to the position to include the meter Next close Switch 2 to the S position Now close Switch 3 only long enough to read the D C ammeter This procedure is called aging the magnet and the ammeter reading should be used as a reference for the amount of aging The strength of the permanent magnet should now be measured by the method described in paragraph a If the strength is too great the magnet should be aged at a greater value of D C2. DPDT Switch On Time Meter Simpson TS 111 ASTS USA PD 30 Code Meter Code Transmitter PC 250TR 180 Code 4 6 2 Procedure This procedure checks Pick Up Minimum Drop Away and On Time performance of the biased code following relay a Pick Up and Drop Away Checks Connect the biased relay test circuit as shown in the in Figure 4 2 and proceed as follows 1 2 3 4 5 Set M1 Current Monitor to appropriate current range Set M2 Voltage Monitor to appropriate voltage range Set switch S1 to Normal Energize power supply and set to appropriate output range Observe M1 and adjust DC power supply output control to obtain the charge current reading indicated in the charge column in Table 4 1 Note that relay energizes and remains energized as voltage is increased M1 CURRENT MONITOR 2 A M2 Si POWER VOLTAGE v Spey MONITOR NORMAL haa A gt Figure 4 2 Biased Code Following Relay Test Circuit 6 Set switch S1 to Reverse Relay should deenergize Set switch S1 to Normal Relay should again energize CF UNDER TEST Gradually adjust dc power supply output control to decrease current and obtain the Drop Away This is the point at which the front contacts open and should not be less than the value specified in Table 4 1 SM 4570 Rev 1 February 1995 al Shop Maintenance 77 AnsaldoSTS 9 10 11 12 Fu
3. N RECEPTACLE CONTACT SPRING we TA RECEPTACLE a KIA AI ka ee NAN y x CONTACT gt SPRING LOCK SIDE LOCK SIDE OLD MOUNTING BASE IMPROVED MOUNTING BASE Figure 2 2 Receptacle Contact Spring Installed SM 4570 Rev 1 February 1995 2 3 al Installation 4 AnsaldoSTS 2 4 3 Installing Wires in Receptacle Contact Springs Use the following procedure to ensure a good electrical and mechanical connection between the conductor wire and the receptacle contact spring The following table identifies the correct crimping tool to be used when installing wires in receptacle contact springs Crimpin Old Style Improved Base ping Wire Size Receptacle Receptacle Contact Tool Contact Spring Spring J397138 10 12 AWG J680181 M451142 2703 J397139 14 16 AWG J680165 Standard M451142 2702 J397188 18 20 AWG J680179 M451142 2701 Strip 3 16 in 0 187 in or 0 47 cm of insulation from the end of the wire Place the receptacle contact spring into the jaws of the proper crimping tool When using only one terminal of any wire size use the shortest terminal Partially close the crimping tool jaws against the receptacle contact spring to hold it in place Do not crush the receptacle contact spring barrel at this time Insert the stripped end of wire all the way into the receptacle contact spring barrel Squeeze the tool handles until crimping is completed and the jaws re
4. Secure the mounting base directly to the rack using the hardware furnished All wiring terminates at the rear of the mounting base to solderless terminals receptacle contact springs Mounting base details of the old style base and new style base are shown in Section 5 2 3 RELAY INDELING Relays are factory equipped with indexing pins to prevent insertion of an incorrect relay into a mounting base Each relay is accompanied by an indexing plate which is applied to the mounting base at the time of initial installation A typical plug in relay with indexing pins and base with corresponding indexing plate is shown in Figure 2 1 The following data defines the indexing that has been established for relays covered by this manual a The index code always consists of four figures such as 0001 0002 or 0101 and is used for both the relay and the indexing plate on the mounting base b The index code for each relay can be determined from the relay part number and its suffix which is marked on the name plate attached to the front of the relay The first two digits of the index code are the last two digits of the part number and the second two digits of the index code are the last two digits of the suffix The index number thus obtained should agree with the placement of the indexing pins in the numbered vertical rows on the back of the relay starting with the top pin and reading down c The index code for each mounting base is determined by the
5. oonnoonnnnnincininicocccnnncoccnnnonannnn nan rca r nono rca r nana rra rara 2 3 Figure 4 1 Circuit for Charging and Aging Permanent Magnets oocccnccccnnncocccnnococccnnononcnn nono nan ronca ncnnnnno 4 5 Figure 4 2 Biased Code Following Relay Test Circuit oooononnccnnnnicinnnncoccnnnoconnnnnncannnnnnna nc arranco narra nana 4 7 Figure 4 3 Biased Code Following Relay On Time Test Circuit oooooniccncniniccconnncocnnnnnnannnnnnnancnr nano nanrnno 4 8 Figure 4 4 Terminal Blocks Viewed form Rear of Relay oooooccoonoccccconocccccononncccnnancnncnn cnn cnnno nc nr nano rca 4 10 Figure 4 5 Test Circuit for Relay with Less Than 2 ORMS 00oocoonoccccnnocccccononcccnnnoncccnnno nan cnnno maziwa rancia 4 11 Figure 4 6 Test Circuit for Relay with Resistance Above 2 DhMS ooooccconnociccconocccccnnoncncnnnancnc nana ncnnnnno 4 11 Figure 4 7 Test Circuit for 18 5 Ohm Relay Resistance ooooccconociccnonocccccononccnnnnoncncnnno nc nccnno anemia nana 4 11 Figure 5 1 PC 250B Relay Main Assembly Parts Location ooonnnocccnniniciconncoccnonononnnononannnc nan rca rnnnn narran 5 4 Figure 5 2 Operating Unit Main Assembly Item 11 Parts Location ooooononncncnniniciconncocccnnncannnrnncarncnnnnon 5 6 Figure 5 3 Contact Assembly Parts LOCAtioN wwwwwwwmmaamwmwaawwa wanu nano nnn nono cnn narrar nana rr rn 5 8 Figure 5 4 Old Style Mounting Base for PC 250B Relay oooooccconoccccconocccccononccccnnancnccnno nan ccnno mazima rca 5 11
6. SECTION THRU SPACES 1 amp 4 7 o 3 ROR 18 SPACE 1 a E 160 space 2 Ed EY EDL 48 SPACE 3 39 SPACE 4 1 By Fzz4 H 2 Figure 5 3 Contact Assembly Parts Location 5 8 SM 4570 Rev 1 February 1995 AJ gt 4 AnsaldoSTS Parts List Table 5 5 Contact Assembly Section Parts List Contact Contact Section in Space Assembly dE 2 3 4 Ww 15 17 15 17 14 16 14 16 19 21 19 21 18 20 18 20 x 14 16 14 16 14 16 14 16 18 20 18 20 18 20 18 20 y 15 17 15 17 15 17 15 17 19 21 19 21 19 21 19 21 Z 15 17 14 16 14 16 14 16 19 21 18 20 18 20 18 20 Numbers in each square are item unmbers for applicable part numbers shown in Table 5 4 KEY TO SEQUENCE Position 1 Front Contact Post Position 2 Front Contact Spring Position 3 Back Contact Spring Position 4 Back Contact Post SM 4570 Rev 1 February 1995 5 9 w Parts List 77 AnsaldoSTS Table 5 6 Old Style Mounting Base for PC 250B Relays Parts List Part Description Number 4 J680179 Contact Receptacle Solderless 18 to 20 Wire M322965 Meter Test Plug J077931 Insulated Test Plug for opening any coil or contact circuit and for removing receptacle springs When Mounting Base complete Item 1 is ordered a muslin bag of parts 4 1 8 x 5 1 2 is included in the inner carton with t
7. and g 4 3 CHECK OUT PROCEDURE Performance Test Perform calibration on time and dynamic test in accordance with Section 4 6 4 4 REPAIRS AND REPLACEMENT Since the contacts are the major wearing parts in this relay in most cases the relay can be restored to proper operation by dressing and readjusting them 4 4 1 Recommended Tools and Test Equipment Magnet Tester N245416 Magnet Charger N249003 Gram Scale 0 30 grams Gap Gauge 0 001 0 055 in SM 4570 Rev 1 February 1995 4 3 al Shop Maintenance 77 AnsaldoSTS Spacer 0 124 in 4 4 2 Disassembly Dismantle the relay only to the degree necessary to complete repairs Refer to Section 5 for part information and location of parts In general to dismantle the plug in relay proceed with the following seguence 1 Remove relay cover seal 2 Carefully remove plastic cover 3 Remove the operating unit as reguired 4 Remove contact assembly as reguired 5 Remove contacts contact springs as reguired 6 Disassemble the operating unit as reguired 4 4 3 Reassembly Reassembly is accomplished generally in the reverse order of disassembly The following paragraphs provide additional instructions to be followed during reassembly of this relay 4 4 3 1 Contact Spring Support If the contact spring support has been removed it should be checked with a straight edge that the forward and rear hinge springs are accurately in line with each other as mounted on the contac
8. Figure 5 5 Improved Mounting Base for PC 250B RelaYS oooconoccccinnocccccononccccnnoncnccnno cnn n cano nc nr rana rca 5 13 List of Tables Table 1 1 Electrical Specifications wa Ka Kida aiaa cacevdasadevbaaecedsvanaddelaaneaedsvaaaae 1 2 Table 4 1 Electrical Adjustments and Calibration ww mmmmmanawmmanwwmwanwwmwnawwmwa auwawa niwa awi maana 4 12 Table 5 1 Parts List References for PC 250B Code Following Vital Relay wwwwwwwwmmaammmaaaa 5 1 Table 5 2 PC 250B Code Following Vital Relay Main Assembly Parts List see Figure 5 1 5 2 Table 5 3 Parts List for Operating Unit Item 11 Used on PC 250B Code Following Vital Relay see Figure 5 2 Aaaa 5 5 Table 5 4 Parts List for Contact Assembly Used on PC 250B Code Following Vital Relay ESA 521 O 5 7 Table 5 5 Contact Assembly Section Parts LiSt ooonnooconnnnccnnnnniccnnnancccnnnoncccnnnancccnn nn ncc canon nc cnn nn cccc naar 5 9 Table 5 6 Old Style Mounting Base for PC 250B Relays Parts List oonnnnccnnnnnccnnnnacocinnnaccccnnnarcccnnnncnns 5 10 Table 5 7 Improved Mounting Base N438689 003 for PC 250B Relays Parts LIist 5 12 iv SM 4570 Rev 1 February 1995 al 4 AnsaldoSTS General Information 1 GENERAL INFORMATION 1 1 Introduction This manual provides service information for the PC 250B plug in relay The PC 250B relay is a biased relay designed for use as a code following track or
9. N245416 as follows The required magnet strength is given in Table 4 1 of this manual under Magnet Grams 4 4 SM 4570 Rev 1 February 1995 D 77 AnsaldoSTS Shop Maintenance 1 The relay permanent magnet should be applied at the front of the testing device across the two vertical members or backstraps of the magnetic structure and resting also against the small stop member near the bottom of each backstrap The north pole of the magnet should be at the left side of the testing device The north pole is marked N in red ink and is that pole of the magnet which attracts the south seeking pole of a magnetic compass 2 Starting with the spring at zero on the dial and the armature resting against the left hand pole piece the dial should be moved gradually to the right The spring will be at the correct grams on the dial at the instant when the armature breaks free from the pole piece b Permanent Magnet Charging The strength of the relay magnet can be changed by using Magnet Charger Part Number N249003 If the relay permanent magnet does not meet specification the magnet should be replaced 1 Connect the magnet charger as shown in Figure 4 1 Place a stop on the adjustable resistor to make sure the resistance will not be changed accidentally The stop will ensure that current through the meter will be limited to a safe value To charge the relay permanent magnet proceed with the following steps D C AMMETER 0 20 AMPS
10. POWER TR cr CF UNDER SUPPLY gt TEST Figure 4 3 Biased Code Following Relay On Time Test Circuit SM 4570 Rev 1 February 1995 al 77 AnsaldoSTS Shop Maintenance Adjustment to meet calibration is accomplished by adjusting the upper pole pieces The ends of these pole pieces are slightly off center and as finally adjusted each pole piece should be turned down just tightly enough so that there can be no vertical play of the coil in the relay Proceed as follows Loosen pole pieces b Move upper pole pieces to the left to increase calibration values or move to the right to decrease calibration values c Move the upper pole piece together or apart to change the spread between Pick Up and Drop Away and between Full Stroke and Full Drop Away NOTE It is generally best to move only one pole piece at a time noting the effect on all calibration values The lower pole pieces must not be changed from their original setting If proper calibration cannot be obtained it might become necessary to remove the permanent magnet and change its strength If the relay has a double wound coil a check should be made that it will pick up when energy is applied to terminals B and B of Figure 4 4 observing the polarity shown For a 400 ohm second winding it will be satisfactory to apply about 10 volts 4 6 3 Operational Test After calibration the relay should be tested for on time gain or loss to mee
11. Ss TU n P zZ Washer 6 Phos Bronze Shakeproof Nut 250 Brass Hex Washer Internal Lock 8 Phos Bronze Shakeproof agnet Permanent lamp Magnet crew 8 32 x 2 1 2 Fillister Head elay Frame Screw 10 32 x 3 4 Fillister Head Screw 8 32 x 1 2 Fillister head Steel m op c A i gt zw DO SM 4570 Rev 1 February 1995 5 5 z Parts List 77 AnsaldoSTS A gg LAN ie A B JILA A S AN IA SA El Se H 2 a ai ae e PEA 7 Figure 5 2 Operating Unit Main Assembly Item 11 Parts Location 5 6 SM 4570 Rev 1 February 1995 al 4 AnsaldoSTS Parts List Table 5 4 Parts List for Contact Assembly Used on PC 250B Code Following Vital Relay see Figure 5 1 Contact Assembly peed Om Operating Reference Unit With Reference Part Number Letter W PN384785 A E G X PN289040 B C H K M P Y N289042 D Q Z N384786 F J L N Part Number aza Block Contact Mounting A 7 10 11 12 13 14 15 Description Used on Relay Reference See Figure 5 3 and Table 5 5 SM 4570 Rev 1 February 1995 Parts List 77 AnsaldoSTS FRONT BACK CONTACT SPRING CONTACT SPRING F C SPRING ee SPRING F C POST B C POST F C POST B C POST 12 SECTION THRU SPACES 2 amp 3 D
12. amperes obtained by reducing Resistor R If strength is too low then the magnet should again be charged to full strength and again aged at a lower value of D C current 4 5 Adjustments All adjusting and testing must be done with the relay in its normal upright position 4 5 1 Contact Adjustment With the permanent magnet in place energize the relay to adjust the front contacts Proceed as follows a Adjust the front contact posts so that light is just visible between the contact tips with a 0 053 inch gauge at the right hand armature stop pin With a 0 051 inch gauge the contacts should be closed b c Deenergize the relay Adjust the back contact posts using the same gauges at the left hand armature stop pin With the permanent magnet removed contacts can be adjusted by moving the bottom of the armature by hand but in this case the gauges used should be 0 050 inch and 0 048 inch 4 6 Calibration CAUTION Calibration of these relays must be made either in a test stand or on a non metallic surface When field testing with covers on do not set the relays on steel tables or house floors Relays must be supported on a non magnetic surface SM 4570 Rev 1 February 1995 NN 4 AnsaldoSTS 4 6 1 Recommended Test Equipment Shop Maintenance NOMENCLATURE PART MODEL TYPE NO Power Supply 0 40 VDC HP6205 or equivalent Digital Multimeter Two required HP3435A or equivalent
13. are silver platinum to silver platinum H V contacts are tungsten to tungsten and are marked with red contact posts H V contacts are for use in circuits above 50 volts to provide longer contact life however they cannot be employed in low voltage circuits due to the contact resistance which they develop Refer to Figure 5 3 for a pictorial representation of the contact assembly 1 3 Specifications The following paragraphs provide the electrical and mechanical specifications of the PC 250B code following relays covered in this manual SM 4570 Rev 1 February 1995 1 1 al General Information 4 AnsaldoSTS 1 3 1 Electrical Relay electrical specifications are tabulated in Table 1 1 in part number order Table 1 1 Electrical Specifications Part Number N322559 4 FB 2 FB 3 FB Contact Arrangement lt oor oo oos 19 ooro oor ooo 1418 oors 0025 ooo 102 oors 0025 ooo 102 oors 0025 ooo 102 0 3 400 ski ee ey Wa 0 3 400 0 600 0 78 0 410 0 82 0 15 200 0 825 1 07 0 565 1 13 ao os tor oss 1 Contacts Two types of contacts are available in the PC 250B Relays L V and H V The L V is silver platinum to silver platinum for use in circuits below 50 volts H V is tungsten to tungsten for use in circuits above 50 volts to provide longer contact life However the tungsten contacts cannot be employed in low voltage circui
14. line relay With no energy applied the armature is biased to close the back right hand contacts When sufficient energy of the proper polarity is applied the relay armature will move to close the front left hand contacts If improper polarity is applied the back contacts will remain closed The design of the PC 250B relay conforms to all applicable AAR specifications 1 2 Description 1 2 1 General The PC 250B relay is manufactured with various combinations of low voltage L V silver platinum and high voltage H V tungsten contacts L V contacts are indicated with green markings on the contact post members in the relay while H V contacts are indicated by red markings The relay is factory calibrated to operate across a wide environmental range All moving parts are enclosed in a sturdy transparent dust and moisture resistant cover To ensure the relay is inserted in its proper mounting base all relays have indexing pins Relays lock securely into the plug in position 1 2 2 Coils Coil resistances of PC 250B relays are depending on part number 18 5 135 225 360 or 400 ohms Refer to Section 1 3 1 to correlate part numbers to coil resistance values The resistance selected depends on the system voltage and circuitry 1 2 3 Contacts Contacts of the PC 250B relays are low voltage L V and high voltage H V L V contacts are marked with green on contact posts and are for use in circuits below 50 volts L V contacts
15. piece mounting base with hardware includes a full complement of receptacle contact springs J680195 0001 to accommodate one or two 14 16 wires mounting fasteners and tags It can however be equipped with receptacle contact springs for one or two 10 12 wires J680195 0002 or for one or two 18 20 J680195 Make certain which type of solderless receptacle contact springs accompany the mounting base before proceeding with their installation Each solderless receptacle contact spring should be inspected for physical damage before proceeding with installation The following is recommended when installing solderless receptacle contact springs a Receptacle contact springs must be inserted into the base with the lock side down or lanced tab up Refer to Figure 2 2 b Make certain that the lanced tab is slightly compressed as the receptacle contact spring is inserted along the top of the cavity The lanced tab could have been bent during handling and therefore would not provide the required contact pressure after the relay is inserted If the lanced tab does not touch pull it up slightly using fingers or a suitable tool c After insertion pull firmly on the wire to make certain the receptacle contact spring is locked in the cavity 2 2 SM 4570 Rev 1 February 1995 al 4 AnsaldoSTS Installation MOUNTING BASE FLAT PIN CONTACTS INDEXING PINS 4 sD o WA A MODULE
16. placement of the holes in the numbered vertical rows of the large white nylon indexing plate which is affixed to the front of the mounting base This indexing plate should not be removed from the mounting base unless it is damaged or the indexing is to be purposely changed to accommodate a relay of a different part number Discard the indexing plate which comes in a bag tied to the handle of all new relays unless it is needed for replacement of a damaged indexing plate or for application to a new mounting base Never drill new holes in a base indexing plate which will permit application of relays with different part numbers or change indexing pins on the back of a relay unless it is being converted to a new part number Otherwise a hazard will be created which may compromise safety circuit functions SM 4570 Rev 1 February 1995 2 1 z Installation 4 AnsaldoSTS 2 4 RECEPTACLE CONTACT SPRINGS 2 4 1 Old Style Base Only The N382814 mounting base will normally be equipped with the required quantity of J680165 solderless receptacle contact springs and will accommodate one or two 14 or 16 wires It can however be equipped with receptacle contact springs for one or two 10 or 12 wires J680181 or for one or two 18 or 20 wires J680179 Make certain which type of solderless receptacle contact springs accompany the mounting base before proceeding with their installation 2 4 2 Improved One Piece Base Only The new one
17. tip members while applying pressure by holding the contact mounting block Wipe the contacts with at least six short strokes of the tool Immediately after the washing the contacts should be wiped dry using a second clean lint free cleaning tool This dry wipe removes or loosens any residue such as dust which was left from step a Wipe the contacts with at least six short strokes of the tool Apply more distilled water to the same tool and wipe the tungsten red contacts Immediately wipe these contacts dry with the same dry cleaning tool as was previously used Immediately blow the contacts with filtered compressed air to remove any loose dust The washing and drying tools should then be washed before re use If the contact resistance is still too high burnish the contacts with metallographic paper Wot cut in strips 1 2 inch wide and repeat steps a to d to remove the dust formed If the contacts are burned or pitted and the operation per step f does not successfully reduce the contact resistance burnish the contacts in the direction of slide with burnishing tool J397187 Follow with metallographic paper and repeat steps a to d to remove the dust formed Cleaning Relay Contacts Alternate Recommended Cleaning materials A relay contact cleaning kit part number x451646 0901 is available that consists of the following three items or which may be ordered individually Burnishing Tool P R Neuses Co No 3 31
18. 2 RELAY INDELING aaah aka kaka zaa ma kaka baaa 2 1 2 4 RECEPTACLE CONTACT SPRINGS socii aiaa aaaea a a a aaa aaia 2 2 24 1 Old Style Base OMY Awa 2 2 2 4 2 Improved One Piece Base ONIY wwwwsamwmwanwwnanawwnanawwawaniwunanumunanumu na rn rra 2 2 2 4 3 Installing Wires in Receptacle Contact SPTINGS wwwsmmmmmaamwmwa muwa niwa nana ncnrnnno 2 4 2 5 RELAY INSERTION ous acid dens cad aa kaakaa kalibu kam Sa makaka dade 2 4 3 FILED MAINTENANCE oinccccsciieieead santas canisencdnatenarsandsvacanntbnis aaa anra aana aN EKA tana nndnnitesansandanacnan 3 1 Sede aa Kota Ua ia ici ista li dida idad dedito 3 1 3 2 Periodic Performance TeSt wwwwwwmwamamwwmwi wa wanunuwi mumu wuma www www wananunua auni i wakia 3 1 3 2 1 AAA een edi wd Naeeledil eect eeelnleedalteai eed 3 1 3 2 2 Service Requirements cccceeeeceecee cece ee eeeeeeeaeceeeeeeesceaeaeeeeeeeeesecsacaeeeeeeesesensacaneneees 3 1 4 SHOP MAINTENANCE ii cisscsscesccsnddsnesnuesnsecenadaanentenncnend da nina nana Rana a nacen Eo 4 1 Ad Introduction a Min dt is A KUPA ATAKE OAU A 4 1 4 2 Cleaning and Inspection 4 1 4 2 1 Cleaning Relay Contacts oooccconoccccnonocccccononcccnanancnccnnoncnc nano nc nr nano nn ka kaakaa 4 1 4 2 2 Cleaning Relay Contacts Alternate ooonnncccnnnnniccnonnnccccononnccnanancnn nano nc nr rana nn rra rca 4 2 4 3 CHECK OUT PROCEDURE Performance Test ooooooonoccccccnccccncocononcconc
19. 2 x 1 2 Fillister Head Nylok for All reference only J522042 Screw 8 32 x 7 16 Fillister Head Stainless Steel All J047714 Washer 8 Shakeproof Lock Stainless Steel All SM 4570 Rev 1 February 1995 5 3 SN Parts List 77 AnsaldoSTS BOTTOM TERMS FOR DOUBLE WOUND COIL RELAYS ONLY FOR REFERENCE ONLY FOR REF ONLY NOMENCLATURE TAG UJ75828 amp 2 4 3 16 RD 2 SELF i TAPPING SCREWS J052674 TYP Figure 5 1 PC 250B Relay Main Assembly Parts Location 5 4 SM 4570 Rev 1 February 1995 al 4 AnsaldoSTS Parts List Table 5 3 Parts List for Operating Unit Item 11 Used on PC 250B Code Following Vital Relay see Figure 5 2 Operating Unit Operating Unit Reference Part Number Reference Part Number A N382792 J N384860 B N382793 K N384861 C N384854 L N384862 D N384855 M N433303 E N384856 N N437019 F N384857 P PN382793 G N384858 Q N384855001 H N384859 Used on Operating Unit Part Number Description Reference 288999 All 382789 All 382790 All All 34751210125 All J048172 288990 289302 289005 Pin N301579 Coil Complete lt a lt O ojo m z N291576 Coil 135 Ohm Complete N304655 Coil Complete zm rielo gt 210 z A m N386143 N386144 N289053 N291576007 M187875 PN384785 PN289040 N289042 N384786 E Contact Assembly sub assembly Item No 12 detailed on Figure 5 3 Itemized in w O Ilo A
20. 44 0 825 1 07 0 565 0 40 None 13 6 1 70 2 0 750 1 07 0 395 Amps Amps 0 30 400 0 82 Amps 75 2 50 0 60 0 78 0 410 0 29 None 0 82 6 1 24 2 0 550 0 78 0 285 Amps Amps 18 5 0 09Amps 65 0 25 0 060 0 085 0 030 0 020 None 0 292 6 0 016 8 0 054 0 085 0 021 Amps Amps 135 8 12 Volts 85 0 060 0 015 0 025 0 008 0 006 510 8 0 Volts 1 13 0 Volts 3 0 012 0 030 0 005 360 14 16 Volts 75 0 045 0 010 0 017 0 005 0 004 1200 yaa 1 21 0 Volts 2 0 008 0 021 0 003 225 8 12 Volts 85 0 060 0 013 0 022 0 006 0 005 750 ie 1 16 0 Volts 2 0 010 0 026 0 0036 823 24 32 Volts 90 0 048 0 007 0 015 0 003 0 0025 3000 E 4 38 0 Volts 2 0 007 0 015 0 003 Double Wound Coil 4 12 SM 4570 Rev 1 February 1995 AJ 4 AnsaldoSTS Parts List 5 PARTS LIST The Reference column letters in Table 5 1 are keyed to the main assembly parts list given in Table 5 2 Table 5 1 Parts List References for PC 250B Code Following Vital Relay Relay Part Coil Reference Number Number of Contacts Ohms 2F amp 2B H V 1 amp 2 360 B _N922550 002 4F amp 4BL V E N322559 003 4F amp 4B L V N322559 004 4F 8 4B H V 2F amp 2B L V 3 amp 4 3F amp 3B L V 2 3 amp 4 2F amp 2B L V 3 amp 4 3F amp 3B L V 2 3 amp 4 N322559 011 1F amp 1B H V 1 0 15 400 3F amp 3B L V 2 3 amp 4 8 5 8 5 25 3F amp 3B L V 2 3 amp 4 N322559 020 SM 4570 Rev 1 Februar
21. 6 J397187 pkg of 5 Burnishing Tool P K Neuses Co No N313 Heavy Duty J397137 001 pkg of 5 Paper Strip strips cut from 67 pound white Springhill Vellum Bristol Paper J793094 pkg of 50 SM 4570 Rev 1 February 1995 NN Also recommended commercially available Emery Paper Wet or Dry 600 Grit cut in strips Freon TF Miller Stephenson MS180 NOTE When using the paper strip clean the silver platinum contacts first and then the tungsten contacts last Discard the paper strips when dirty 4 2 2 1 Contacts That Are Severely Burned a Using a 600 grit emery paper strip folded with the grit side out so that both contacts can be burnished simultaneously stroke the contacts in the direction of contact wipe b Using the burnishing tool stroke the contacts several times in the direction of contact wipe c Place the paper strip between the open contacts then close the contacts and withdraw the paper strip d Repeat step c several times if necessary e Using the Freon TF spray give the contacts a degreasing wash f Place the paper strip between the open contacts then close the contacts and withdraw the paper strip g Repeat step f several times if necessary 4 2 2 2 Contacts with Heavy Tarnish Slightly Rough or Pitted Perform the procedure in Section 4 2 2 1 Steps b to g 4 2 2 3 Contacts with Surface Film or Oxidation Not Pitted a Perform the procedure in Section 4 2 2 1 Steps f
22. a AA me 1000 Technol Drive Pittsburgh PA 15219 Y AnsaldoSTS 645 Russell Stael Batssburg SC 29006 S M 4570 PC 250B Vital Code Following Relay ASTS USA Part No Ll N322559 Installation Operation Maintenance Copyright 2012 SM 4570 Rev 1 Ansaldo STS USA Inc February 1995 al wA AnsaldoSTS Notices Proprietary Notice This document and its contents are the property of Ansaldo STS USA Inc formerly known as Union Switch amp Signal Inc and hereinafter referred to as ASTS USA This document is furnished to you on the following conditions 1 That no proprietary or intellectual property right or interest of ASTS USA is given or waived in supplying this document and its contents to you and 2 That this document and its contents are not to be used or treated in any manner inconsistent with the rights of ASTS USA or to its detriment and are not to be copied reproduced disclosed or transferred to others or improperly disposed of without the prior written consent of ASTS USA Important Notice ASTS USA constantly strives to improve our products and keep our customers apprised of changes in technology Following the recommendations contained in the attached service manual will provide our customers with optimum operational reliability The data contained herein purports solely to describe the product and does not create any warranties Within the scope of the attached manual it is impo
23. eptacle contact springs M451142 2702 for 14 to 16 wire If other wire size is needed request the proper part number as shown in Item 4 when ordering base complete i e N438689 001 except using receptacle contact springs solderless M451142 2703 PF These Items are for attaching the mounting base to the rack 5 12 SM 4570 Rev 1 February 1995 N 77 AnsaldoSTS Parts List Figure 5 5 Improved Mounting Base for PC 250B Relays SM 4570 Rev 1 February 1995 5 13 D Parts List y AnsaldoSTS N g AnsaldoSTS 5 14 SM 4570 Rev 1 February 1995 D r E AnsaldoSTS RAIL Team and Technical Support 6 RAIL TEAM AND TECHNICAL SUPPORT The Rapid Action Information Link Team RAIL Team is a group of experienced product and application engineers ready to assist you to resolve any technical issues concerning this product Contact the RAIL Team in the United States at 1 800 652 7276 or by e mail at railteam ansaldo sts us SM 4570 Rev 1 February 1995 6 1 D h RAIL Team and Technical Support Y AnsaldoSTS g AnsaldoSTS End of Manual 6 2 SM 4570 Rev 1 February 1995
24. he mounting base and instruction prints 4 1 4 20 x 1 1 4 Round Head Steel Screw 4 1 4 20 Steel Hex Nuts Required Quantity Contact receptacles solderless J680165 for 14 to 16 wire If other wire size is used request the proper part number as shown in Item No 4 when ordering base complete i e N382814 except using contact receptacles solderless J680181 Asterisk Items are for attaching the mounting base to the rack 5 10 SM 4570 Rev 1 February 1995 z 77 AnsaldoSTS Parts List N e o e ooul 000000 100000 D0000n 2000000 000000 5 16 Figure 5 4 Old Style Mounting Base for PC 250B Relay SM 4570 Rev 1 February 1995 5 11 w Parts List 77 AnsaldoSTS Table 5 7 Improved Mounting Base N438689 003 for PC 250B Relays Parts List item No Part Number Description M451142 2702 Receptacle Contact Spring Solderless for 14 to 16 Wire 4 M451142 2701 Receptacle Contact Spring Solderless for 18 to 20 Wire M451142 2703 Receptacle Contact Spring Solderless for 10 to 12 Wire vos2e67 Screw 1420x 1 1 4 Round Head e oso Plate Washer 1 4 Steel o soaeo02 Nut 174 20 Hex stee y When Mounting Base AA is ordered a bag of parts is included NOTE that contains the following 2 Tags Item 5 4 Screws Item 6 4 Lock Washers Item 7 4 Plate Washers Item 8 4 Nuts Item 9 Required quantity Rec
25. it is important that there be little or no resistance in series with the battery Voltage should be adjusted by means of a loading down rheostat or low resistance potentiometer across the battery using only as many battery cells as required 18 5 ohm relays should be tested in the circuit of Figure 4 7 obtaining both currents by adjustment of rheostat R2 SM 4570 Rev 1 February 1995 4 9 al Shop Maintenance AnsaldoSTS r UPPER BLOCK a ON DOUBLE WOUND COIL RELAYS ONLY B B LOWER BLOCK CONTACTS AS 2B 2H 2F B 1H 1F NUMBERED FROM Cc 4B 4H 4F 3B 3H 3F EE As REAR Figure 4 4 Terminal Blocks Viewed form Rear of Relay 4 7 Calibration Requirements 4 7 1 In Service Test Calibration requirements will be met when the relay adjustment values are the same as those given in Table 4 1 of this manual After any shop adjustments are made check the calibration values Section 4 6 and if they are not within the values given in Table 4 1 of this manual the relay should not be placed in service 4 7 2 Contact Resistance Resistance of front contacts should be measured with the armature in its full stroke position and resistance of back contacts should be measured with the armature fully released Cleaned contact resistances should not exceed the following values Type of Con
26. lease When using both terminals it is more convenient to attach the first wire to the longest terminal Remove the crimped receptacle contact spring from the tool and inspect the connection Make certain that the wire is flush with the crimped barrel and that there are no loose strands of wire 2 5 RELAY INSERTION Orient the relay to the mounting base with the name plate right side up then plug the relay into the base The relay should be pushed firmly against the mounting base while depressing the latch rod After the relay is completely seated in the base release the latch rod and pull on the handle to ensure that the relay has locked in place SM 4570 Rev 1 February 1995 NN 3 FILED MAINTENANCE 3 1 Introduction This section provides the necessary periodic preventive maintenance procedures which must be performed to ensure continuous proper and efficient operation of the PC 250B style relays covered in this manual Field maintenance covers periodic inspections and performance tests 3 2 Periodic Performance Test 3 2 1 Cleaning Before inspecting and testing the relay if necessary use a soft cloth to clean the exterior to remove any dirt or dust that may have collected A safe cleaning solution of alcohol and water or common laundry detergent may be used for removal of accumulated dirt grease etc 3 2 2 Service Requirements 3 2 2 1 General All vital code relays must be inspected and tested at least once every tw
27. meet calibration requirements the contacts should be cleaned in accordance with the procedure given in Section 4 2 1 1 and 4 2 1 2 Due to the possible unavailability of the sleeving 3772330 for the cleaning tool N378099 an alternate contact cleaning procedure is presented in Section 4 2 2 CAUTION If 1t is desired to use an aerosol spray for cleaning relay contacts only virgin Freon TF available from Miller Stephenson Chemical Co As MS 180 or MS 230 Contact Re Nu Freon TF is approved by ASTS USA SM 4570 Rev 1 February 1995 4 1 al Shop Maintenance 4 AnsaldoSTS 4 2 1 1 General a b Preliminary information The cleaning tool should be used to clean no more than 12 front and 12 back contacts after which they should be washed before re use The cleaning tool should be cleaned using a mild soap or detergent and water rinsing thoroughly and allowing to dry New Sleeving To apply new sleeving to the cleaning tool heat seal one end by placing in a flame and pinching quickly with pliers Stretch the sleeving over the cleaning tool and cut off excess material 1 8 beyond the end of the tool Keeping the material stretched heat seal the second end Wash the tool before using if it does not appear to be perfectly clean 4 2 1 2 Contact Cleaning Procedure a 4 2 2 Apply distilled water dispensed from a clean closed container to a clean cleaning tool and wash the silver platinum green contact
28. nnnnnnnononncnnnnnannnnenonncnnn 4 3 4 4 REPAIRS AND REPLACEMENT tissscassducectsatcsucasaaaccevsancsace kaaa huka aa aaa a aaa aaa hakikidhi 4 3 4 4 1 Recommended Tools and Test Equipment ccccceceseeeeceeceeeeeeeseenaeaeeeeeeeeenennaees 4 3 4A 2 DISASSOMDIY aa a a thee sede ean ital 4 4 4 4 3 REASSOMDIY ec ce eeeeee ee eene cece entree ee niwa ee niwa ee eet nimu ee eaaeeeeeeaaeeeeeeaaeeeseeaeeeeeeiaeeeeeenaeeeseeaas 4 4 A5 AUS MS ii dotando acabada 4 6 4 5 1 Contact AdjuStMeNt ooooonccccnnoccccnnnoccccnononcncnanoncnc nano nn nr cano rca cnn rca r rar rnn rre 4 6 4 6 Cali TO 4 6 4 6 1 Recommended Test Equipment c c ccccceceeeeeeceeceeeeeeeeeceecaeeeeeeeseseecueaeeeeeeeeenenaees 4 7 46 2 PLOCOQU O Aaaa 4 7 4 6 3 Operational Test wi ita daa 4 9 4 7 Calibration Requirement ccccccceeeeeeeeceeceeeeeeeeeceaeeeeeeesesceaeaeeeeeeesesenaeeeeeeeeesessaneeeeees 4 10 ALTA INSA TOS iii iia cai cds 4 10 4 1 2 Contact RESISTANCE ii aa teas end date a dit 4 10 SM 4570 Rev 1 February 1995 iii al e Table of Contents 4 AnsaldoSTS E PARIS LIST E E E E 5 1 6 RAIL TEAM AND TECHNICAL SUPPORT cscsesesesescscscscscsssscecscscsesesecececscscsesscscsracsctescacacacecesees 6 1 List of Figures Figure 2 1 Typical Plug In relay and Mounting Base ooocnncccoconococcconononcnnnnnoncnnnnno nc nr nnno nn nr nano rca r rana rca 2 3 Figure 2 2 Receptacle Contact Spring Installed
29. o years The tests and inspections are to include pick up current drop away current and proper code following operation and visual inspection of contacts for damage or misalignment corrosion or other contamination of parts loose parts inside of the cover broken seal and cracked or broken cover Relays not passing the above stated tests and inspections must be replaced and not returned to service until the operating characteristics and conditions are in accordance with ASTS USA specifications 3 2 2 2 In Service Test It is recommended that line relays in service be removed from service for shop repairs when the calibration values are not within the Field Limits given in Table 4 1 or the On Time values are not as specified CAUTION Calibration of these relays must be made either in a test stand or on a non ferrous surface When field testing with covers on do not set the relays on steel tables or house floors Relays must be supported on a non magnetic surface 3 2 2 3 Test Procedures Test the operating characteristics of the PC 250B style relays as described in Section 4 6 in this manual SM 4570 Rev 1 February 1995 3 1 Ni Filed Maintenance 4 AnsaldoSTS N g AnsaldoSTS 3 2 SM 4570 Rev 1 February 1995 NN 4 SHOP MAINTENANCE 4 1 Introduction This section provides the information necessary to perform shop level repairs of the PC 250B style relays covered in this manual In general rela
30. rther gradually reduce the current to obtain Full Drop Away This is the point at Which the left hand armature stop pin touches the pole piece and should not be less than the minimum value specified in Table 4 1 Reduce the current to zero and open the coil circuit for one second Gradually adjust dc power supply output control to increase current and obtain Pick Up This is the point at which the front contacts close and should not be less than value in in Table 4 1 Further gradually increase the current to obtain Full Stroke This the point at which the right hand armature stop pin touches the pole piece and should not be less than the value in Table 4 1 b On Time Test Connect test circuit as shown in Figure 4 3 and proceed as follows l 4 With the PD 30 connected as shown in Figure 4 3 between the heel and front contacts of a given contact set set the PD 30 function switch to SET 100 and adjust the ADJ control for an indication of 100 on the meter Set the PD 30 Function switch to Slow and observe the movement of the meter pointer Take the reading after the pointer settles to a somewhat steady indication The meter indication should be between 30 and 70 To check the on time period of the back contact repeat steps 1 and 2 with the PD 30 connected between the heel and back contacts Repeat steps 1 through 3 for all sets of contacts ON TIME METER a yr AB 3 or 50 OT
31. ssible to take into account every eventuality that may arise with technical equipment in service Please consult an ASTS USA local sales representative in the event of any irregularities with our product ASTS USA expressly disclaims liability resulting from any improper handling or use of our equipment even if these instructions contain no specific indication in this respect We strongly recommend that only approved ASTS USA spare parts are used as replacements SM 4570 Rev 1 February 1995 i al Revision History 77 AnsaldoSTS Revision History 0 August 1984 Initial Release Revised Table 1 1 Section 2 4 2 step b Section 2 4 3 Section 3 2 2 Section 1 February 1399 4 6 2 step b 2 Table 4 1 Table 5 1 and Table 5 2 ji SM 4570 Rev 1 February 1995 AJ 4 AnsaldoSTS Table of Contents Table of Contents T GENERAL INFORMATION wi ia asia 1 1 11 Introduction aa 1 1 1 2 DESCHPION A AAA AAA a a ee 1 1 121 General assaiar iea aa a aa a a aa aaa e aa aaa aK E aAa aa eaaa 1 1 1 22 CO iia di aai a a 1 1 12 3 CONACS iniaiaiai a a e a Aaa aa a ia Eaa a A ATAA a a aa an aA 1 1 ya Sa aa aa AA AUA a a E a a a nace 1 1 1 3 1 Electrica AAA KA idad 1 2 1 3 2 Mechanical ccccccccceceeecceeceeeeeeeeecacaeceeeeesescaaeaeeeeeeesescaaeaeeeeeeesecencaeeeeeeeeesecsesieeeeess 1 2 2 INSTALLATION cirrosis a ra 2 1 Pa PO EL e AAA AA AAA AA AA AA ET 2 1 2 2 MOUNTING BASS AUAWA AA AAA ato 2 1 2 3
32. t block With the spring support reassembled each contact spring should have an initial pressure of 13 to 15 grams against its stop as measured at the center of the contact tip The armature in this relay has a slight bend and should be mounted so that the bottom of the armature is off set toward the front contact side of the assembly With the permanent magnet removed and with all front and back contact posts clear of the spring tips the left side of the armature should stand 3 64 inch from the side of the hole at the bottom of the coil spool The lower left hand pole piece should be adjusted to just touch against the armature stop pin The lower right hand pole piece should be adjusted to just make against a 0 124 inch spacer at the right hand armature stop pin Securely tighten both lower pole pieces The upper left and right pole pieces can be set to be about 3 16 inch clear of the contact spring support and armature respectively This is a preliminary adjustment of upper pole pieces which will be established in calibrating the relay 4 4 3 2 Permanent Magnet The permanent magnet must be applied with its side marked N at the left side of the relay otherwise the relay will not pick up when the indicated polarity is applied to its coil If the magnet is handled carefully it should not be necessary to change its strength a Permanent Magnet Strength Test Measure the strength of the relay permanent magnet using Magnet Tester Part Number
33. t the values given in Table 4 1 The circuit used will be Figure 4 5 Figure 4 6 or Figure 4 7 depending upon the relay resistance On time gain or loss is the difference between the percent on time of the code transmitter contact and that of a front contact of the relay under test It is permissible to readjust the upper pole pieces to obtain correct dynamic operation but in this case the relay calibration must be rechecked to agree with the values given in Table 4 1 When the relay has tungsten contacts it may be found necessary to clean very carefully the contact at which on time is being measured The method for measuring on time is described in Section 4 6 2b of this manual If the resistance of the relay is below 2 ohms it should be tested in the circuit of Figure 4 5 With steady energy applied and switch 1 closed left adjust resistor R1 to obtain the relay current given in Table 4 1 under Max Loss On 180 code the on time loss should not exceed the value given With steady energy applied and switch 1 closed right adjust R1 to the relay current given under Max Gain On 180 code the on time gain should not exceed the value given If the resistance of the relay is above 2 ohms except 18 5 ohm relays it should be tested in the circuit of Figure 4 6 Using the value of snub resistor given in Table 4 1 it should be checked that the on time gain and loss are within the limits given at the test voltages specified For this circuit
34. tacts Ohms Silver Platinum 0 05 Max Tungsten 0 5 Max Contact surfaces should not be disturbed unless there is evidence of severe pitting from excessive loading or an accidental short through the contacts When contacts must be dressed 600 grit emery paper should be used and this should be followed by the use of the burnishing tool and paper strip 4 10 SM 4570 Rev 1 February 1995 al 77 AnsaldoSTS Shop Maintenance 180 CODE TRANSMITTER APPROX MUST HAVE LOW VOLTAGE CONTACTS 0 5 OHM e dera 0 40 oe OHM OHM O Pal approx STEADY ENERGY 1 SWITCH 2 0 VOLTS LEFT RIGHT 0 40 OHM A RELAY UNDER TEST ON TIME METER Y Figure 4 5 Test Circuit for Relay with Less Than 2 Ohms SNUB RESISTOR Figure 4 6 Test Circuit for Relay with Resistance Above 2 Ohms APPROX Ll 20 OHMS 7 0 OHMS 4C5 0010 00 Figure 4 7 Test Circuit for 18 5 Ohm Relay Resistance SM 4570 Rev 1 February 1995 4 11 a Shop Maintenance 77 AnsaldoSTS Table 4 1 Electrical Adjustments and Calibration Shop Adjustment Limits Amps On Time Gain or Loss Filed limits Amps Magnet Relay Recommended ms Mini Maximum MinimumlMinimum Maximum Loss Maximum Gain Pick Up Minimum Ohms Working 10 Charge UN Full Drop Full Drop Sia 7 7 Minimum Maximum Drop P Stroke Away Away At h At h Away 0 15 400 1 13 Amps 90 3
35. ts due to the contact resistance which they develop m TP TIT PT lt lt lt lt lt lt lt lt lt lt re ee aa WA wai a E a lt lt lt lt aoa m ia ami ai o wa E ali E a EEES a A a E aa a E ES ele le peels lt lt lt lt IT eee le lt lt lt lt lt lt lt 1 3 2 Mechanical The following mechanical specifications are common to all PC 250B relays covered in this manual Dimensions Height 7 1 16 17 93 cm Width 4 15 16 12 54 cm Depth 8 3 8 21 2 cm Temperature 40 F 40 C to 185 F 85 C 1 2 SM 4570 Rev 1 February 1995 NN 4 AnsaldoSTS General Information Indexing Relay part number determines indexing plate required Refer to Section 2 3 Weight 9 3 8 Lbs Mounting Base N382814 Old Style 37 oz N438689 003 New Style 18 oz Mounting Base Dimensions Height 7 15 16 20 16 cm Width 4 15 16 12 54 cm Depth Old Style Base 2 7 16 6 19 cm Depth New Style Base 1 25 32 4 5 cm SM 4570 Rev 1 February 1995 1 3 aA gt General Information AnsaldoSTS N g AnsaldoSTS 1 4 SM 4570 Rev 1 February 1995 al 4 AnsaldoSTS Installation 2 INSTALLATION 2 1 General Relays plug directly into a mounting base which is secured to a rack The only installation instructions required are for the mounting base 2 2 Mounting Base
36. y 1995 5 1 w Parts List 77 AnsaldoSTS Table 5 2 PC 250B Code Following Vital Relay Main Assembly Parts List see Figure 5 1 Used on Relay Part Number Description Reference 7 Pin Roll Stainless Steel PM382797 Contact Block 10 w zo BETS om m gt tla gt gt ez A Operating Unit Sub Assembly Item No 12 Detailed On Figure 5 2 Itemized On Separate Parts Listing J522153 Screw 10 32 x 3 4 Fillister Head Nylok for All reference only J047081 Gasket Rubber J776598 Cover Molded Relay z J5072950119 Screw 8 32 x 7 16 Long Fillister Head A043013 Wire Seal 22 AWG 2 Ply J079351 Security Seal Gray S003665 N384860 Operating Unit 0 3 400 Ohms gt l gt i Hi po m JE TU 13 14 gt gt gt gt 5 2 SM 4570 Rev 1 February 1995 al 4 AnsaldoSTS Parts List Used on Relay Part Number Description Reference 19 J7763040001 Cover Molded Relay C D E H N P through N Q 2 gt m J4751210125 Washer 10 Stainless Steel Shakeproof J5072960129 Screw 10 32 x 3 8 Phillips Head 27 gt gt gt gt gt N3497115917 Parts Bag with Indexing Plate N3497115920 Parts Bag with Indexing Plate NOTE Item 31 consists of the following 2 Machine Screw 6 32 x 1 1 4 Round Head J525099 1 Nomenclature Tag J075828 2 Type F Self Tapping Screw 4 40 x 3 16 Round Head J525024 1 Inst Tag S003863 J522149 Screw 18 3
37. ys arriving at the shop for repair have been checked in the field and have been found to perform unacceptably or have been physically damaged 4 2 Cleaning and Inspection Before inspecting the relay and initiating repairs use a soft cloth to clean the exterior carefully to remove any dirt or dust that may have collected A safe cleaning solution of alcohol and water may be used for removal of accumulated dirt grease etc Inspect the relay exterior for signs of physical damage such as cracked or broken cover cracked or damaged housing and damaged and or missing contact block terminals and indexing pins If severe damage is found a careful inspection of the interior components should be made for obvious physical damage Remove the cover and clean the surface between the armature and the pole faces especially the stop pin area using a lint free cloth and alcohol Proceed with relay contact cleaning using the following recommended cleaning materials Recommended Cleaning Materials Order Reference Cleaning Tool N378099 Extra sleeving for recovering three metal strips J772330 4 0 Metallographic paper sheet 9 x 14 J035215 Burnishing tool J397187 Lead pencil soft non oil content Distilled Water 4 2 1 Cleaning Relay Contacts This section covers recommended methods for the preparation and cleaning of relay contacts After contacts have been dressed and or after adjustments have been made to
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