PN-159B Biased D.C. Car Carried Plug-In Relay
Contents
1. MET 2EA M347526 SPACER 0548X48X120 STEEL SHT 1EA J487090 PIN ROLL 3 32DX1 1 8 4 EA M437208 SHIM 001 STOCK 2 EA M373632001 ARM OPERATING 1EA M376608001 SHIM 2EA J792756 INSERT 6 32 SLF CL SS 4 EA 5 2 J4751210107 WASHER SST LOCK NO 6 4 EA SM 4551 W Rev 2 May 2011 ay AnsaldoSTS Parts Lists of 65 8 A 00 6 amp G19 2 G Figure 5 1 PN 159B Relay Parts Detail Sheet 1 SM 4551 W Rev 2 May 2011 5 3 AN 77 AnsaldoSTS Parts Lists 0000006000 0000000000 L l i 2 Figure 5 2 PN 159B Relay Parts Detail Sheet 2 SM 4551 W Rev 2 May 2011 5 4 AN Parts Lists 77 AnsaldoSTS Figure 5 3 PN 159B Relay Exploded View 5 5 SM 4551 W Rev 2 May 2011 a Parts Lists 4 AnsaldoSTS 5 2 Relay Mounting Base N451376 0303 Table 5 2 lists the parts for the new style solderless PN 159B Relay Mounting Base Refer to Figure 5 4 Table 5 2 Mounting Base for Car Carried Relays ITEM PART NUMBER DESCRIPTION J780055 BASE MOUNTING MOLDED J792848 STRIKE RELAY J480280 NUT SPEED PUSH ON M451 1422703 SPRING CONTACT J5001360120 SCR SST 4 20 x 1 14 J4751210111 WASHER SST LOCK NO 1 4 J4751210112 WASJER SST PLATE NO J4802110108 NUT 4 20 SST HEX J075951 TAG RELAY IDENTIFICATION O CO N O o1 A2. SAFSET 00135210 SCREW 6 32X1 2 FIL HD M432380 INDICATOR ARM POS PN436768 MAGNET PERM M321853 STRAP MAGNET STEEL J4751210127 WSHR SST 170 ID FLT J052242 SCREW 6 32X3 8 FIL HD J561111 HANDLE PULL ALUMINUM J4751210125 WSHR SST 10 SHAK PF J5072960129 SCR SST 10 32X3 8 PH M196812 WASHER N436791 COIL ENCAPSULATED PN159B J051070 SCREW 6 32X3 8 FL HD BRASS M310328 SPRING GUIDE SCREW J5000970112 SCREW 1 4 20X3 4 HEX HD SS J4751210107 WASHER SST LOCK NO 6 M451 1088001 SM 4551 W Rev 2 May 2011 PLATE NAME 5 1 Parts Lists Table 5 1 AM 4 AnsaldoSTS PN 159B Relay N436788 Parts List continued ITEM PART NUMBER DESCRIPTION J480014 NUT 1 4 28 HEX BRASS 1 EA J047081 GASKET RUBBER 1EA J776596 COVER MOLDED RELAY 1EA J5072950119 SCREW 8 32 X 7 16 L FIL HEAD 2EA A043013 WIRE SEAL 22 AWG 2 PLY 0 500 FT J079351 SEAL SECURITY GRAY 1EA M436772 CONTACT SPRING STEEL COIL 2EA M253273 NUT LOCK 1 EA J463078 BOLT 8 32X1 1 4 STEEL 1 EA M327179 SCREW 1 4 HEX HD BRONZE RD 1 EA M376608 SHIM BRONZE PHOS STP 4EA J5072980121 SCR SST 6 32X1 HEX 2EA M349785 SPRING 26 PHOS BRONZE RD 1EA J525024 SCREW 4 40 X 3 16 PAN HD SS 2EA J792919 BOLT LOCK MONEL
3. o 5 6 SM 4551 W Rev 2 May 2011 RM AnsaldoSTS Parts Lists Sin E E L A qur 9 IDOSO e Q Q APPLY RECP SPRINGS LOCKING SIDE DOWN Figure 5 4 PN 159B Relay Mounting Base SM 4551 W Rev 2 May 2011 5 7 Parts Lists 5 3 Relay Mounting Base N436797 Table 5 3 lists the parts for the original style PN 159B Relay Mounting Base 5 8 Table 5 3 PN 159B Mounting Base Original AM 4 AnsaldoSTS PART NUMBER DESCRIPTION QTY M436796 BASE J078458 CLPING PL PN 150 J078459 BLOCK MOLDED CLMPNG J522090 SCREW 6 32X5 8 FIL HD STEEL S000007 SHEET INSTR FORM7 J078399 BAG PLASTIC 60F 0406 J075828 TAG VINYLITE J052674 SCREW 4X3 16 RD HD J047711 WASHER CORK GR240 FINE J680165 SPR CONTACT RCPT J052667 SCREW 1 4 20X1 1 4 RD J047775 WASHER 1 4 STEEL LOCK MED J047501 WASHER 1 4 STEEL PLATE J048002 NUT 1 4 20 UNC 2B HVY SM 4551 W Rev 2 May 2011 74 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 4551 W Rev 2 May 2011 6 1 RA
4. relay value e Pick Up value increases to more than 110 of the new relay value 4 3 Contact Opening Verification With the armature against the permanent magnet extension the front contacts must have at least 0 050 opening With the back contacts just closed there should be a 0 020 minimum front contact opening With the relay upright the armature should be moved to a position such that each heel spring is transferring between top and bottom of its slot in the driver In this position both front and back contacts should be standing open at least 0 005 4 4 Permanent Magnet Hold Down Force With the relay in the normal upright position and de energized a force measured with gage Pc UN105440 of at least 320 grams applied at the bottom of the centermost contact driver should be required to cause the armature to move away from the permanent magnet This check should be made before and after the relay has been calibrated and after energizing with the charge value using normal polarity of energization Because of the allowable variation in the stiffness of the material from which the contact springs are made the hold down force may vary between relays that have the same strength magnets For this reason on relays that have 380 grams or more hold down force using nominal spacers replace one of the phosphor bronze screws shiny nickel plating that holds the magnet assembly to the pole piece with a dull tin plated steel screw UJ463078 which
5. will shunt some of the magnetic flux Bending the adjustable shunt away from the magnet slightly will raise the hold down force if necessary SM 4551 W Rev 2 May 2011 4 1 a Relay Service Tests 4 AnsaldoSTS 4 5 Contact Resistance Resistance of front contacts should be measured with the relay energized and the armature against the stop pin that of back contacts with the armature in the de energized position Cleaned contact resistances must not exceed the values given in Table 4 1 Table 4 1 Contact Resistance Specifications CONTACT TYPE FRONT CONTACT Q BACK CONTACT 0 Silver to Silver 0 18 Impregnated Carbon 4 2 SM 4551 W Rev 2 May 2011 4 AnsaldoSTS 5 PARTS LISTS 5 1 PN 159B Relay M436788 Table 5 1 lists the parts for the PN 159B Relay Refer to Figure 5 1 and Figure 5 2 Table 5 1 PN 159B N436788 Parts List Parts Lists PART NUMBER DESCRIPTION QTY M436776 RELAY FRAME M263916 GUIDE SPRING M275388 NUT 006X5 16 STEEL LOCK J487087 PIN SPRING SLOTTED 3 32 X3 8 420SS M436770 BLOCK SUPPORT M436764 POLE PIECE J052066 SCREW 8 32X5 8 FL HD M436771 PLATE 1 8X1 2 BRASS N436786001 ARMATURE S003665 TAG N438633 CONTACT BLOCK N3306817800 BAG PARTS J5072980120 SCR SST 6 32X3 4 FH M436773 ARMATURE BRACKET PN 159B M341 808 PIVOT 1 4 STEEL RD J050731 SCREW 8 32X5 16
6. AN BER 1000 Technology Drive Pittsburgh PA 15219 AnsaldoSTS 645 Russell Street Batesburg SC 29006 SM 4551 W PN 159B Biased D C Car Carried Plug In Relay For 24V Systems ASTS USA Part No N436788 Installation Operation Troubleshooting Copyright 2011 SM 4551 W Rev 2 Ansaldo STS USA Inc May 2011 EM 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 at
7. F 6B LV Contacts Full Back Maximum Pick Up tos Charge Prop Away V contact and V Winding V Pressure Drop Away v Minimum 9 0 11 0 5 5 min 15 0 17 0 tare tate fae reci NNN 3 2 SM 4551 W Rev 2 May 2011 REY 4 AnsaldoSTS Relay Service Tests 4 RELAY SERVICE TESTS 4 1 Periodic Performance Test All vital relays must be inspected and tested at least once every four 4 years The tests and inspections are to include pick up current drop away current timing of slow operating and timing relays 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 All vital relays installed in locomotive or car carried equipment are to be removed from service and adjusted repaired and tested at least once every six 6 years Relays not passing the tests and inspections must be removed and not returned to service until the operating characteristics and conditions are in accordance with ASTS USA specifications 4 2 Readjustment Values It is recommended that relays in service be readjusted when one or more of the following conditions occur using as reference the calibration values for new relays given in Table 3 1 e Drop Away value falls below 90 of the new relay value e Drop Away with Full Back Contact Compression armature resting against permanent magnet value falls below 33 of the new
8. IL Team and Technical Support AnsaldoSTS EN y AnsaldoSTS End of Manual 6 2 SM 4551 W Rev 2 May 2011
9. aeceeneeceeeesaeeseaeeeeeeesaas 4 2 SM 4551 W Rev 2 May 2011 N 1 GENERAL INFORMATION This specification contains information for the adjustment calibration and testing of the PN 159B D C Plug In Relay Except for the center pivoted armature and the use of hold down coil springs with modified pole piece structure this relay is the same as the PN 150B relay Service Manual 4551 The contacts 6F 6B are low voltage silver to silver impregnated carbon fronts and silver to silver backs This relay was designed for car carried vital applications It is biased and has a balanced armature Table 1 2 contains a summary of adjustments Table 3 1 contains calibration values 1 1 Safety Summary Read and thoroughly understand this manual before attempting any of the procedures listed Pay particular attention to CAUTION and These headings may appear throughout this manual Caution statements indicate conditions that could cause damage to equipment Warning statements indicate conditions that could cause physical harm serious injury or loss of life Always observe standard precautions familiar to trained electrical technicians Always adhere to all safety regulations stipulated by the railroad 1 2 Abbreviations and Acronyms The following are abbreviations and acronyms used in this manual along with their associated meanings ASTS USA Ansaldo STS USA Inc formerly known as Union Switch amp Signal Inc VDC Volts Direct C
10. he armature fully released when each driver is pulled toward the front of the relay all slots will remain properly engaged Proper engagement means that at least 1 2 of each narrow slot engages the heel spring and that the wider slot engages at least the thick section near the end of the bracket finger But the driver must be free enough in all armature positions that there can be no binding with respect to bracket or springs 2 2 SM 4551 W Rev 2 May 2011 a AnsaldoSTS Adjustment and Replacement Procedures ADJUSTABLE COIL SPRING EE MAGNET EXTENSION SETT HIT nnammmnnr TU Peo oy uo ADJUSTABLE SHUNT STRAP iba 7 RENE my CONTACT BLOCK ARMATURE ASSEMBLY POLE FACE Figure 2 1 Permanent Magnet Assembly Details SM 4551 W Rev 2 May 2011 2 3 AN Adjustment and Replacement Procedures AnsaldoSTS Sy 7 AnsaldoSTS 2 4 SM 4551 W Rev 2 May 2011 If AnsaldoSTS Relay Calibration 3 RELAY CALIBRATION After the relays have been inspected and adjusted they should be calibrated to meet the values given in Table 3 1 Before calibrating the relay should be energized at the charge value and no higher the energization being pole changed several times allowing the current to build up to full value in each direction 3 1 Polarity Verify relay polarity with the following steps 1 With the negative power lead connected to the or A coil terminal the
11. ins should strike the pole faces as nearly flat as possible Safety stop pins must not touch the pole faces 2 2 Permanent Magnets 2 2 1 General These magnets are of a special alloy that permits retention of proper strength indefinitely if not abused When not in place on relays magnet assemblies should be kept separately with the screws tight which hold the shunt and extension to the magnet These screws should never be loosened sufficiently to let the shunt be separated from the magnet even when on the relay as this would weaken the magnet considerably Should a magnet become weakened we suggest that it be re turned to our factory for recharging due to the special equipment required to charge the magnet fully and then age it to its best working strength The polarity of the magnets should be such that the top end farthest from the two notched holes will attract the end of a compass needle which points toward geographic south 2 2 2 Magnet Assembly The magnet assembly should be applied to the pole piece as shown in Fig 1 making sure that the shunt between the magnet and the magnet extension is touching the pole piece Tighten the two long screws holding the magnet assembly to the pole piece sufficiently to straighten the curved strap against the magnet Bend the nut locks securely up against the sides of the screw heads 2 2 3 Magnet Adjustment The permanent magnet extension should be adjusted so that it just touches the two pins on
12. ontacts This value should be within the values specified in Table 3 1 SM 4551 W Rev 2 May 2011 3 1 A Relay Calibration 4 AnsaldoSTS The full drop away back contacts fully compressed armature resting on the permanent magnet extension must be not less than the minimum drop away in Table 3 1 Shims 0 001 can be used at one or both ends of the backstrap to meet the drop away limits 3 3 Pick Up Immediately after the drop away value has been measured the current should be reduced to zero the circuit opened for one second then the current again applied in the same direction gradually increasing it until the armature moves away from the permanent magnet with a very definite sudden motion This value should not be more than 95 of the actual pick up value measured on the tested 6 point relay The current should be further increased until the armature picks up to close the front contacts and the armature stop pins close against the pole piece This value should not be more than that specified for maximum Pick Up and Working in Table 3 1 The pick up value can be varied by adjusting the hold down coil spring CAUTION Electrical timing characteristics of the relay are changed if the relay hold down bolts are excessively tightened In all systems where the PN 159B relay is used the bolts R451299 0102 must be tightened with a torque wrench to 25 in Ibs 5 in Ibs Table 3 1 Calibration Values For Relays with 6
13. positive power lead connected to the or B coil terminal and the relay energized at the Charge value the armature should not pick up With the relay energized at the reverse polarity so that the positive power lead is connected to the or A coil terminal the relay should pick up The or A coil terminal is the left hand coil terminal on the relay as viewed from the front of the relay 0 B B O 8 Figure 3 1 Mounting Base Connections Coils A A or B B 2 With the negative power lead connected to the A coil terminal the positive power lead connected to the B coil terminal and with applicable jumpers as illustrated in Figure 3 2 and the relay energized at the charge value the armature should not pick up With the polarity of energization reversed so that the positive power lead is connected to the A coil terminal the relay should pick up The FA coil terminal is the upper left hand coil terminal on the relay as viewed from the front of the relay O O B B O Figure 3 2 Mounting Base Connections Series or Multiple Coils l gt gt O 3 2 Drop Away The relay should be given a charge of four times the pick up value and the current then gradually reduced until the armature drops away opening all front c
14. sseeeen ener entente nnne tnr sette enne n nnn sn tren enne 5 1 5 2 Relay Mounting Base N451376 0303 rrrnnnnnnvrnnnnnnvrnnnnnnvrnnnrnnrrnnnennrrnnnersrrnnnersrrnnnersrrnnsennrrnnen 5 6 5 3 Relay Mounting Base N436797 rata e ceara aANT enki AEEA 5 8 6 RAIL TEAM AND TECHNICAL SUPPORT rarrrnnnvnnnnvnnnnvnnnnavnnnnnnnnnnnnnnvnnnvnnnnnnnnnnnvnnnvsnnnnnnnnnennnnnnenenr 6 1 SM 4551 W Rev 2 May 2011 ili A Table of Contents AnsaldoSTS Figure 1 1 Figure 2 1 Figure 3 1 Figure 3 2 Figure 5 1 Figure 5 2 Figure 5 3 Figure 5 4 Table 1 1 Table 1 2 Table 4 1 List of Figures Overall Dimensions of the PN 159B Relay aa 1 3 Permanent Magnet Assembly Details 2 3 Mounting Base Connections Coils A A or B B see 3 1 Mounting Base Connections Series or Multiple Coils ee 3 1 PN 159B Relay Parts Detail Sheet 1 sse 5 3 PN 159B Relay Parts Detail Sheet 2 sss 5 4 PN 159B Relay Exploded View sssssssssssssssssseseeeeenennnnerer eren 5 5 PN 159B Relay Mounting Base sss 5 7 List of Tables Relay SpecificationS mrrrnannvnnonnvnnnrrrnnnrnnnnnvnnennennnrnnannvnnnnnennnr ane tnn entretenir snnt nennen 1 2 Mechanical Adjustment Specifications sse 1 2 Contact Resistance Specifications cccccccccceceeeeeeeeeceeeeeceeeeea
15. stati ester patei ul uu ipa uo E cu re ua aee ds 2 1 2 2 1 Generale tet nr Db xag OO PN ETN 2 1 2 2 2 Magnet Assemibly tenes LU e tta eee alice das so e eee o eS 2 1 2223 Magnet Acjustment ssen reete e ctetuer Ferte ur ER ELE nue 2 1 2 3 Contact Block Replacement 1 eet tl eee sano Pe eed Lea eta p Leak aoa 2 1 2 4 Front and Back Contact Adjustment reatar nennen nnne 2 2 2 5 Contact Drivers Heel Spring Adjustment 2 2 XMoidpxde B hoeugeee 3 1 Sd LOCI AL PEPO 3 1 3 2 Di elo varmet udekket a bat 3 1 33 PO U se ns despera dos ngo o esp ando redes rg toevoegen ea 3 2 4 RELAY SERVICE TESTS eite tec a tha io en eoe aka Re ad ram tak BERE va xe reda Pa RES 4 1 4 1 Periodic Performance Test mm narnnnnnnvnnnnnnnvnnnnnnnvnnnnnnnvnnnnnnvnnnnnnnnnnnnnnnnnennnnnneennnnnneennnnnneennnnene 4 1 4 2 Readjustment Values eeessesssiseeseseeeeeeeeen nennen entrent nnn n tenens entren nn nre nnnes 4 1 4 3 Contact Opening Verification ruonvrnrnrvrrnnrrnnnnvnnenrvnnnrrnnn uvenn nnnrnrrennr nen neret enses 4 1 4 4 Permanent Magnet Hold Down Force eee aereas 4 1 4 5 Contact HesistafiCO tro een etre erede oo eeu as eene Deed c En eua La tate tae iu enu va de 4 2 CHEM UJ KE anga iios 5 1 5 1 PN 159B Relay M436788 ssssssssssssse
16. t With the armature stop pin picked up against the Front Open Spacer called for in Table 1 2 each front contact shall be barely open With the Front Closed Spacer all front contacts must be making at least one button With the armature stop pin picked up against the Back Open Spacer called for in Table 1 2 each back contact shall be barely open With the Back Closed Spacer all back contacts must be making at least one button With the relay at full stroke all front contact buttons must be making With the relay at full drop away all back contact buttons must be making As viewed from the side contacts must make and compress with the point of contact between limits of 1 3 and 2 3 of the diameter of the button 2 5 Contact Drivers Heel Spring Adjustment NOTE Section 2 5 and Figure 2 1 apply only to the older stick driver style of PN 159B relay With the relay upright and the armature stop pin picked up against the Heel Contact Spacer called for in Table 1 2 adjust the heel springs until each driver will fall into engagement at all slots when moved rearward onto its heel springs and the driver bracket Adjust by bending the fingers of the driver bracket and if necessary by slight bending at the reduced section of each heel spring During this adjustment the front and back contacts must be open Install the driver retaining clips The driver bracket must be adjusted with respect to the armature so that with t
17. tached manual it is impossible 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 4551 W Rev 2 May 2011 A Revision History 77 AnsaldoSTS Revision History DATE NATURE OF REVISION 0 December 1973 Revised to incorporate ECO CRS 01380 EELO and various other updates May 2011 Added Section 4 1 ii SM 4551 W Rev 2 May 2011 AnsaldoSTS Table of Contents Table of Contents 1 GENERAL INFORMATION esr eS eo peinetapenirenena anni lnsecenteeedsond en seaeceecessneiesecesdsnetduetenstaersnbiiast 1 1 lilio Safety SUM UM Ary xi ir ae leap aiaa oia da ro EEB arao Ea kae Satoo elna Ta Saa sas Edao meme da daada 1 1 1 2 Abbreviations and Acronyms 0 ec cceeeeeeeeeeneeeeeeeneeeeeeaaeeeeeeaaeeeeeeaaeeesesaaeeeeeeaaeeeseeaaeeeseeaeeeeneaas 1 1 RES EM o ej 67 0 REED DOO 1 2 2 ADJUSTMENT AND REPLACEMENT PROCEDURES esee 2 1 2 1 Armature Air Gap Adjustment sssssssssssssssesseseeee ener en nennen nennen nennen nes 2 1 2 2 Permanent Magnets teste iile te
18. the bottom of the armature with the nominal spacer specified in Table 1 2 inserted between the main armature stop pin and the upper pole face armature stroke If necessary in order to obtain contact openings this spacer may be varied within the limits given in Table 1 2 With the armature released both back stop pins should make contact with the permanent magnet extension face and neither should project over the magnet extension In this position the air gap at the permanent magnet pole face should average 0 004 inch parallel and must not be less than 0 003 inch at any point This is the physical air gap from plated pole face to plated armature 2 3 Contact Block Replacement If the contact block is to be replaced by another remove the old block then use a small punch to remove the small dowel pins Attach the new block with the four screws Run a 42 drill 0935 dia through the dowel pin holes into the contact block for a total depth of 9 16 1 32 0 Carefully install the dowel pins tapping in until they are flush with the surface If it is necessary to install a used contact block from another relay remove only one of the dowel pins from the aluminum frame Carefully press the block on the remaining pin and fasten in place with the screws One dowel pin will adequately hold the block in place SM 4551 W Rev 2 May 2011 2 1 a I Adjustment and Replacement Procedures AnsaldoSTS 2 4 Front and Back Contact Adjustmen
19. urrent SM 4551 W Rev 2 May 2011 1 1 I General Information AnsaldoSTS 1 3 Specifications The operating specifications for the N436788 PN 159B Relay are shown in Table 1 1 Table 1 1 Relay Specifications COIL 400 400 Q CONTACTS 6 FB Dependent FRONT CONTACTS Silver Impregnated Carbon HEEL CONTACTS Silver BACK CONTACTS Silver SYSTEM OPERATING 24 VDC VOLTAGE The mechanical specifications for the N436788 PN 159B Relay are shown in Table 1 2 and illustrated in Figure 1 1 Table 1 2 Mechanical Adjustment Specifications ARMATURE ARMATURE ADJUSTING SPACER MINUMUM AIR GAP Heel Front Front Back Back BON Contact Open Closed Open Closed 0 023 in 0 170 in 0 085 in 0 065 in 0 058 in 0 113 in 0 120 in 320 grams 1 2 SM 4551 W Rev 2 May 2011 Ny AnsaldoSTS General Information 8 7 32 2876543210 06000000000 0000000000 0000006000 0000000000 7 1 16 4E1 0008 00 Figure 1 1 Overall Dimensions of the PN 159B Relay SM 4551 W Rev 2 May 2011 1 3 oh General Information AnsaldoSTS ANY 4 AnsaldoSTS 1 4 SM 4551 W Rev 2 May 2011 a 4 AnsaldoSTS Adjustment and Replacement Procedures 2 ADJUSTMENT AND REPLACEMENT PROCEDURES 2 1 Armature Air Gap Adjustment The armature air gap at the center of each armature tip is set at the factory to 0 023 The air gaps along the rest of the tips should not vary more than 30 002 from this value The stop p
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