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1. O tS Minutes o e 20 Minutes e e FOR TDEL CODE bold italics O O O Seconds Disabled e Sed O 2 Seconds e O O SSeconds e Seconds O 120Seconss _ 3005 b There may be an active retransfer inhibit If a retransfer inhibit is enabled the load transfer will not take place until the Override pushbutton on the control panel is pressed the retransfer inhibit input is disabled or the generator fails NOTE If a retransfer inhibit is present the transfer switch is miswired This fea ture is not to be used with the RSS transfer switch On the controller the transfer inhibit P4 5 and retransfer inhibit P4 6 should not be wired c Although it is not offered with this transfer switch a phase check may be enabled When the phase check function is enabled the utility does not assume the load until both sources are within acceptable limits of the phase check sensor If the Utility Power Available LED is not lit a Check the control setting to verify that the utility undervoltage dropout point is set low er than the pickup set point Check to see if the Utility Power Available LED is flashing If the Generator Power Connected LED is flashing a The control was unsuccessful in its attempts to open the Generator side of the transfer switch After fiv
2. 4 8 Circuit Breaker Replacement Procedure 4 9 Signal Transformer Replacement Procedure 4 10 5 PAHISINEORMATION 5 1 6 WIRING DIAGRAMS n 8 6 1 Safety Precautions This manual includes the following symbols to indi cate potentially dangerous conditions Read the manual carefully and know when these conditions exist Then take the necessary steps to protect per sonnel and the equipment This symbol warns of immediate hazards that will result in severe personal injury or death This symbol refers to a hazard or unsafe practice that can result in severe per sonal injury or death This symbol refers to a hazard or unsafe practice that can result in personal inju ry or product or property damage ELECTRICAL SHOCK CAN CAUSE SEVERE PERSONAL INJURY OR DEATH High voltage in transfer switch components pres ents serious shock hazards that can result in severe personal injury or death Read and follow these suggestions Keep the transfer switch cabinet closed and locked Make sure only authorized personnel have the cabi net keys Due to the serious shock hazard from high voltages within the cabinet all service and adjustments to the transfer switch must be performed only by an electrician or authorized service representative UTILITY TO GENERATOR APPLICATIONS If the cabinet must be opened for any rea
3. eee 2 3 Return to Programmed Transition 2 3 Elevator Post Transfer Delay 2 3 Accessing the Front Panel Configuration Editor 2 4 Modifying the 6012 dm dM e 2 4 Preliminary Troubleshooting 5 2 7 Power Outage 5 But Generator Does Not Start 2 7 Generator Starts During Normal Power Service 2 7 Generator Does Not Exercise 2 8 After a Power Failure the Generator Starts But Does Not Assume the Load 2 9 After Power Returns the Transfer Switch Does Not Return To Normal 5 NER UU 2 10 Generator Continues to Run After Retransfer of Load to Normal Power 2 10 oystem Does Not Test With Load 2 11 oystem Does Not Exercise With Load 2 12 Battery Charger Fails To 2 12 Battery Loses 2 13 Battery Loses Change 2 m ehe Ded Qe ER Rc rate tus 2 13 Table of Contents continued SECTION TITLE PAGE Detailed Troubleshooting Procedures 2 13 About 2 13
4. 1 8 2819 1875 13SN39 E 9 64 o 481 8 94 2 e m j m gt 4 O 4 79 SLOVLNOD N0I123NNOD QVO AuVI TI XV HOLIMS 8 Vd 1 N 81 VI 39 A43111V8 ONISN3S 3NIT OL uoo NO VNHON OL 435010 HOLIMS 345 1 11 437198313 34 NMOHS S321A3Q 11 1102 801 8340 SLV 4313119438 390198 A9N3943N3 OL Q03123NNOO 51 SLY N3HM SN3dO TWWYON OL GILOINNOD 51 SLY N3HM SN3dO HOLIMS YJiSNVYL 21 LVWOLAY HOLIMS AuVI TIXOV NOILISOd HOLIMS AYVITIXAY NOILISOd IWWYON AV13U A29N39U3N3 15012 AV13U IWNYON 3501 n gt Co 95 Ww w S310N N aN VN 2 182 05 15 SLY 158 MSV 114405 ALI TI Lf 6 2 c US c 30 133HS SNIHIA H3TIOHLNOO HLIA HOLIMS HSASNVUL 559 1 9 400 0 806 069 13 18 2 _0 9 20405099 ES 51 8 23 YOLVYINIS Od HOLIMS 6 3 2 30 L 133HS H3TIOHLNOO LNOHLIM HOLIMS H33JSNVHUL SSH 2 9 4 400 0 9H 10 45 G6 0 9 5501133 103 4401 N 81 23 ONIQNOG 5 ae S S d N I N 114408 4 23 U S gy 114408 v3 ae meer O oo VN
5. Check for proper utility power between transfer switch power terminals NA and NB Voltage must be higher than the utility volt age sensor pickup point Check power circuit wiring between the transfer switch and the upstream circuit breaker If the circuit breaker is tripped rest the upstream circuit breaker Wait until the time delay up to 30 minutes has expired or press the Override push button on the control panel or ground the Override input If present remove the P4 6 and ground wire or press the Override pushbutton Check phase rotation Check frequency differences between the two sources Frequency differences must be 1 Hz or less TABLE 2 7 UTILITY POWER IS RESTORED BUT THE SWITCH DOES NOT TRANSFER TO THE UTILITY CONT AC power within the cabinet presents a shock hazard that can cause severe personal injury or death Use extreme caution to avoid touching electrical contacts with body tools jewelry hair clothes etc Prior to working with live circuits remove all sources of AC power The following procedures are to be performed only by technically trained and experienced personnel Improper operation of the generator presents a hazard that can cause severe personal injury or death Observe all safety precautions in your generator manuals Possible Cause Corrective Action Indicator Generator Con nected LED is flashing The control was unsuccessful in its attempts to open th
6. Always disconnect a battery charger from its AC source before discon necting the battery cables Otherwise dis connecting the cables can result in voltage spikes high enough to damage the DC con trol circuits b If there is an external battery charger dis connect the battery charger from its AC power source Ignition of explosive battery gases can cause severe personal injury Do not smoke or cause any spark arc or flame while servicing batteries Accidental starting of the gen erator can cause severe personal injury or death due to electrocution or contact with moving parts Disconnect the starting bat tery cables before performing service Bat teries emit hydrogen a highly explosive gas Thoroughly ventilate the battery compartment before removing battery cables Remove the negative cable 5 first to reduce the risk of arcing c Disconnect the generator starting battery negative lead first If the cabinet must be opened for any reason remove AC power to the au tomatic transfer switch If the instructions require otherwise use extreme caution due to the danger of shock hazard d Remove AC power to the automatic transfer switch Remove the transfer switch cabinet door panel Remove the hardware securing the bus bars to the circuit breaker Remove the two 8 32 screws securing the cir cuit breaker to the circuit breaker bracket Remove the circuit breaker Use the two
7. WK ae eee A Jg 111110 80188319 2 4 182 82 1 310 a 7282 81110 LON OQ 6989 002 SSY 8989 00 559 OWA 072 01 dN JOVI TOA W WIXVN WSINVHO3A 0111504 OML 3081 3SVHd 319NIS OL 435012 HOLIMS 433JSNYVUL HLIM 0321983 3 30 NMOHS 513134 TV 1 SALON 7 6 4u3uv3u8 110813 128398343 283 11 8 YIMVIYG 1112810 11111118 1102 40198140 51 J 831111214 390188 185 4g01V43N39 01 GILIANNOD 51 51 N3HM N3dO cS A111110 01 Q31293NNOD 51 51 N3HM 340 15 YINYOISNVYL NMOQ 4315 11 HOLIMS 4315 1 OILVWOLAY SLY HOLIMS 111 NOIIISOd YOLVYINID MSO HOLIMS Auvi TIXOV NOTLISOd ALITILA MSV AVi3H M 42018 2 1 ZR 34745 28 45 38 45 YOLVYINID NOILISOd HOLIMS ALI TILA 111504 HOLIMS 1081302 HOLIMS 8315 2 35 35 ALITILA 35435 ALI 1I 1f 6 4 30 LASHS H3TIOHLNOO LNOHLIM S3HOLIMS H34SNVH SSH 72 9 1002 0 5 1381860 cjOcUuS 9698 0689 ON ES MS 7 781 1 1 aN S1V 51 NS INYHOJN 19115 2 20 20 25294 2 98 019 71 13 X 1 IX IL 83 S1V V1 S1V IV S1V oV S1V 6 5 ONAN CUMMINS GENERATOR SET SERIES GGDB ALL SPEC S ENGINE CONTROL PANEL SIZE WIRES AS FOLLOWS 2 NOR
8. Modified 6 2007 FIGURE 6 8 INTERCONNECTION WIRING DIAGRAM WITHOUT CONTROLLER FOR GENERATOR SERIES GSAA 6 11 THIS PAGE LEFT INTENTIONALLY BLANK 2008 Cummins Inc All rights reserved Cummins Onan Cummins Power Generation 1400 73rd Ave NE Minneapolis MN 55432 USA Phone 1 763 574 5000 Toll free 1 800 888 6626 Fax 1 763 574 5298 Email www cumminsonan com contact www cumminsonan com Cummins Onan the logo and Performance you rely on are trademarks of Cummins Inc 2007 Cummins Power Generation Inc All rights reserved
9. Service Manual Cummins Onan Performance you rely on Transfer Switch RSS100 and RSS200 English 1 2008 962 0522 Issue 1 2008 Cummins Inc All rights reserved Table of Contents SECTION TITLE PAGE SAFETY 2 1 INTRODUCTION 1 1 on 1 1 1 2 1 2 7 am 1 2 34 1 3 Transfer Switches With a Controller 1 3 Transfer Switches Without a Controller 1 4 ow o Service SEEDS 1 5 2 TROUBLESHOOTING TRANSFER SWITCHES WITH A 2 1 Contrelsiganel L ElSndicators 2 1 Control Panel Functions That Should Not be Adjusted 2 3 Time Delay Program Transition 2 3 2 3 External Exercise On Off 2 3 System Nominal Voltage 2 3 System Nominal Frequency 50 60 HZ 2 3 single Phase
10. 1 Remove all sources of power from the transfer switch in the following order a Move the operation selector switch on the generator to Stop Off Always disconnect a battery charger from its AC source before discon necting the battery cables Otherwise dis connecting the cables can result in voltage spikes high enough to damage the DC con trol circuits b If there is an external battery charger dis connect the battery charger from its AC power source Ignition of explosive battery gases can cause severe personal injury Do not smoke or cause any spark arc or flame while servicing batteries Accidental starting of the gen erator can cause severe personal injury or death due to electrocution or contact with moving parts Disconnect the starting bat tery cables before performing service Bat teries emit hydrogen a highly explosive gas Thoroughly ventilate the battery compartment before removing battery cables Remove the negative cable s first to reduce the risk of arcing c Disconnect the generator starting battery negative lead first If the cabinet must be opened for any reason remove AC power to the au tomatic transfer switch If the instructions require otherwise use extreme caution due to the danger of shock hazard d Remove AC power to the automatic transfer switch 2 10 11 Remove the transfer switch cabinet door panel Disconnect the AC power cord from the batte
11. 2 13 M 2 15 Utility to Generator Sequence of Events 2 15 Generator to Utility Sequence of Events 2 17 Troubleshooting With Symptoms 2 19 arsar 0 2 19 06 k 2 20 ee 7 22500 000 2 23 Miscellaneous Troubleshooting Issues 2 26 3 TROUBLESHOOTING TRANSFER SWITCHES WITHOUT A CONTROLLER untere MET SIE 3 1 Sequemee of 3 1 Utility to Generator Sequence of Events 3 1 Generator to Utility Sequence of Events 3 3 Troubleshooting With Symptoms 3 3 Transfer Switch Operation 3 3 3 3 4 TRONS PER 4 1 Switch Assembly Removal and Replacement Procedure 4 1 Limit Switch Replacement Procedure 4 5 Control Replacement Procedure 4 6 Battery Charger Replacement Procedure 4 7 Control Relay Replacement Procedure
12. 8 32 screws removed in step 4 to install the new circuit breaker Use the hardware removed in step 3 to reinstall the bus bars Tighten the bolts to 80 in Ibs 9 Nem Restore power a Reconnect the generator starting battery negative lead first b If there is an external battery charger recon nect the battery charger to its AC power source c Restore AC power to the automatic transfer switch d Move the operation selector switch on the generator to the Remote or Auto position FIGURE 4 8 CIRCUIT BREAKER SIGNAL TRANSFORMER REPLACEMENT PROCEDURE This procedure is only for RSS transfer switches without a controller The transfer switch presents a shock hazard that can cause severe personal injury or death Before beginning installation remove all sources of AC power If a generator provides emergency power move the generator operation selector switch to Stop disconnect AC line power disconnect the battery charger from its AC power source and disconnect the starting battery negative lead first 1 Remove all sources of power from the transfer switch in the following order a Move the operation selector switch on the generator to Stop Off Always disconnect a battery charger from its AC source before discon necting the battery cables Otherwise dis connecting the cables can result in voltage spikes high enough to damage the DC con trol circuits b If there is an exter
13. TB4 5 signaling the transfer switch has dis connected from the Utility then the BSW limit switch provides a ground signal to TB4 6 signaling that the transfer switch has con nected to the Generator The generator re ceives a signal to indicate the switch position on the generator side 5 The load is transferred to the generator FIGURE 3 1 RSS TRANSFER SWITCH WITHOUT A CONTROLLER ONE BREAKER WITH DOOR PANELS REMOVED YOLVYANAD JHL ALNILN 45 1 5 ALNILN dO 5501 72 6 1002 01 SNO1123NNO2 4 01 N 81 V1 45 9698 0689 ON N pe ER 114405 i mo 8 _ O 0 OO 939V3H8 4111110 3013 3 39 182 1 3108 d 39Vd 33S JHL SH34SNVH L HOLIMS STIVA 8 ALMILA ALETILLO AHL OL 1 SI HOLIMS 4 5 SN3ddVH ATIVNHON 803 483 41110 LON OQ 6989 002 SSY 8989 001 554 OWA 072 OL df JOVLIOA WOWIXVN NSINYHO3N NOILISOd OML 30841 3SVHd 319115 2 OL 435019 HILIMS 5 HLIM Q371983N3 3Q0 NMOHS 48 533134 11V A4311V8 310N 13 3 81113813 AON39U3N3 282 1105415 ALI TILA 182 1102 401
14. d Remove AC power to the automatic transfer switch Remove the transfer switch cabinet door panel Spread the relay clips apart and remove the relay s from the relay base s Install the new relay s on the relay base s making sure the screw head on the bottom of the relay matches up with the hole in the relay base Make sure the relay clips are securing the relay s to the base s Restore power a Reconnect the generator starting battery negative lead first b If there is an external battery charger recon nect the battery charger to its AC power source c Restore AC power to the automatic transfer switch d Move the operation selector switch on the generator to the Remote or Auto position FIGURE 4 7 CONTROL RELAY INSTALLATION CIRCUIT BREAKER REPLACEMENT PROCEDURE This procedure is only for RSS transfer switches without a controller The transfer switch presents a shock hazard that can cause severe personal injury or death Before beginning installation remove all sources of AC power If a generator provides emergency power move the generator operation selector switch to Stop disconnect AC line power disconnect the battery charger from its AC power source and disconnect the starting battery negative lead first 1 Remove all sources of power from the transfer switch in the following order a Move the operation selector switch on the generator to Stop Off
15. from its AC power source and disconnect the starting battery negative lead first 1 Remove all sources of power from the transfer switch in the following order a Move the operation selector switch on the generator to Stop Off Always disconnect a battery charger from its AC source before discon necting the battery cables Otherwise dis connecting the cables can result in voltage spikes high enough to damage the DC con trol circuits b If there is an external battery charger dis connect the battery charger from its AC power source Ignition of explosive battery gases can cause severe personal injury Do not smoke or cause any spark arc or flame while servicing batteries Accidental starting of the gen erator can cause severe personal injury or death due to electrocution or contact with moving parts Disconnect the starting bat tery cables before performing service Bat teries emit hydrogen a highly explosive gas Thoroughly ventilate the battery compartment before removing battery 10 11 cables Remove the negative cable 5 first to reduce the risk of arcing c Disconnect the generator starting battery negative lead first If the cabinet must be opened for any reason remove AC power to the au tomatic transfer switch If the instructions require otherwise use extreme caution due to the danger of shock hazard d Remove all AC power to the automatic transfer switch Fo
16. Diagram 0630 3395 Interconnection Diagram 0630 3518 Outline Drawing 0500 4824 Suitable for use as service equipment UTILITY source only An additional disconnect must be readily avaiable for the alternate source unless the alternate source is an accessible generator and can be readily shut down Use Copper Or Aluminum Wire For Power Connections Use 60 C Rated Wire 14 AWG Use 75 C Rated Wire 1 0 AWG And Larger Control circuit wiring must be installed in conduit Do not install in conduit with AC power wiring Suitable only for use with Cummins generator model GSAA This transfer switch is rated for use on a circuit capable of delivering not more than 10 000 rms symmetrical amperes 240 volts maximum Continuous load current to exceed 80 percent of switch rating FIGURE 1 7 RSS200 WITHOUT CONTROL DISPLAY NAMEPLATE ONE CIRCUIT BREAKER HOW TO OBTAIN SERVICE SCREW TO BE REMOVED When the transfer switch requires servicing con tact your nearest Cummins Power Generation dis tributor Factory trained Parts and Service repre sentatives are ready to handle all your service needs To contact your local Cummins Power Generation CONTROLLER CPG distributor in the United States or Canada call 1 800 888 6626 this automated service uti lizes touch tone phones only By selecting Option 1 press 1 you will be automatically connected to the distributor nearest you If you are unab
17. Events Troubleshooting With Symptoms Utility Power Failure Utility Power Is Restored Miscellaneous Troubleshooting Issues 2 13 AC power within the cabinet pres ents a shock hazard that can cause severe per sonal injury or death Use extreme caution to avoid touching electrical contacts with body tools jewelry hair clothes etc The following procedures are to be performed only by techni cally trained and experienced personnel About Customer Inputs In applications with remote customer inputs the generator may start unexpectedly as a result of these inputs These symptoms may appear to be caused by the transfer switch control Verify that the remote input is not causing the symptom or isolate the control from these inputs before troubleshooting the control Control Panel LED Indicators The control panel located on the transfer switch en closure door contains six LED indicators The indi cators provide some information about the current control status and may be helpful in troubleshooting the transfer switch See Figure 2 1 Table 2 1 and Table 2 4 TABLE 2 4 CONTROL PANEL CONNECTIONS FUNCTION TYPE COMMENTS L3 Generator CONNECTOR P4 L1 Generator L3 Utility L2 Utility L1 Utility Voltage Sensor Inputs 75 480 Volts AC Functional Earth Ground Common for remote inputs Remote Override Connect to 4 1 to activate Remote Test Connect to 4 1 to activate External Exerciser Clock Connect to 4 1
18. IHL OL MOVE 5 45 1 HOLIMS SNun 138 ALMILN HOLVH3N39 OL Q3193NNOO SI HOLIMS 5 SN3ddVH ATIVNHON 95538 803 OWA Orc OL df 39V1 10A WOWIXVN WSINYHO3N NOILISOd 3081 3SVHd 319NIS 2 111110 01 435013 HOLIMS YJJSNYYL HLIM 0321993 3 30 NMOHS 34V 321 A3Q I 310N pna 4398uVH2 11 8 4u34v348 1105815 ALITILA 182 1102 40148140 51 2 131311938 390198 182 YOLVYANGD OL Q3123NNOD 51 SLV 4 65 OL Q3123NNO2Q 51 51 N3HM 4 15 YANYOISNVYL NMOQ 4315 11 HOLIMS 8315 81 OILVWOLAV 51 HOLIMS LIWII NOILISOd YOLVYINID MSE HOLIMS LINIT 10111504 MSV AVi3H IY 45018 781 2 3945 juVdS 3uVdS QqaZzi9H3N3 QN3931 NOI LISOd HOLIMS 1081302 HOLIMS 8315 1584259 ALI TI 1l 35435 ALI TI 1l YOLVYANID NOILISOd HOLIMS 3 4 TABLE 3 1 TROUBLESHOOTING THE TRANSFER SWITCH AC power within the cabinet door presents a shock hazard that can cause severe per sonal injury or death Use extreme caution to avoid touching electrical contacts with body tools jewelry hair clothes etc Prior to working with live circuits remove all sources of AC power The following procedures are to be performed only by technically trained and experienced personnel Improper operation of the generator presents a h
19. ONYV 1NV1002 IVNOI 140 212 vivo 13N 1041809 01140 19171 9NIMOVd 9311 1 3015 13411084 51 VO vOYY 9220 LuVd V31 34 9 10 19 31 NV 9 01 803 03215 34V 50731 S 29 1831 X8OML3N 1 1140 E Fe 09 q c 6L 8 1 5 md 14915 310133 et m Ed EH 3 NENNEN 91 01 8 03503 VK JNO 1333 NT SONVISTO CONV 3215 3818 111601 8 93503 8801104 SV 5381 IZIS v cu O30NVUIS 38 15085 ET OMY ZI SI 181 NO 3215 381M Sa EUIS 321134 3148 V2 OL 039NVHO 38 2 gt m 101 111085 ISNA ONINIM XJONI3N HLIM 1100802 5 SER 1 V NI NAY SI u3MOd 13531198 7081802 jl s pep AES 1 19 02 OLIVdIN 803 03811038 SI EE 1304 MOT 1041802 139839 NO S3OVSS3N WHY TV YINOLSNI 01502 1714510 OL 43840912402 38 AVN ISN T HG 318 8091 JN02 43401502 33V 1 181 OL SNOIIO3NNOO ERO MEN 5110 a 12 E SAV13U 114110 1 01140 0014 QNVNAO2S JMOd 10411039 6 8 ONAN
20. but do not include a controller transfer switches see Figure 1 2 e Section 1 describes the basic operation ofa e Section 4 provides information on servicing transfer switch and provides information on the transfer switch model identification and how to obtain ser vice Section 5 includes parts information Section 2 provides information on how to e Section 6 includes transfer switch wiring dia troubleshoot transfer switches that include a grams controller see Figure 1 1 FIGURE 1 2 RSS TRANSFER SWITCH WITHOUT CONTROLLER ONE BREAKER WITH DOOR PANELS REMOVED FIGURE 1 1 RSS TRANSFER SWITCH WITH CONTROLLER WITH DOOR PANEL REMOVED Copyright 2007 Cummins Power Generation All rights reserved Cummins Onan and PowerCommand are registered trademarks of Cummins Inc 1 1 INTRODUCTION This is an open transition transfer switch With an open transition switch there is never a time when both sources are supplying power to the load This manual includes information on the following types of RSS transfer switch installations RSS with Controller The RSS transfer switch with an Automatic Transfer Switch ATS control includes an operator panel lo cated behind the hinged panel in the upper left hand corner on the front of the enclosure Access to the control can be obtained by re moving the controller cover screw The door panel must be removed to gain access to transfer switch components RSS wit
21. expires press the pushbutton If the switch does not transfer after pressing c Although it is not offered with this transfer the Override pushbutton a time delay ele vator TDEL may not have expired due to a misconfiguration The TDEL can be set up to 300 seconds Change the TDEL to 0 sec onds switch a phase check may be enabled When the phase check function is enabled the generator does not assume the load un til both sources are within acceptable limits of the phase check sensor System Does Not Exercise With Load The default setting for the RSS transfer switch is to exercise without load This procedure only applies if you expect the unit to exercise with load AC power within the cabinet pres ents a shock hazard that can cause severe per sonal injury or death Whenever the cabinet panel is removed use extreme caution to avoid touching electrical contacts with body tools jewelry clothes hair etc 1 Check the control setting to verify that the Exer cise With Without Load function has been set to With Load 2 If the control has been set to Exercise With Load a The transfer time delay may not have ex pired The TDNE can be set for up to 300 seconds If you do not wish to wait until the time delay expires press the Override pushbutton If the switch does not transfer after pressing the Override pushbutton a time delay ele vator TDEL may not have expired due to a misconfigurati
22. not take place until the Override push button on the control panel is pressed or the transfer inhibit input is disabled NOTE transfer inhibit is present the trans fer switch is miswired This feature is not to be used with the RSS transfer switch On the controller the transfer inhibit P4 5 and retransfer inhibit P4 6 should not be wired 2 Check to see if the Utility Power Available LED is flashing If the Utility Power Connected LED is flash ing a The control was unsuccessful in its attempts to open the Utility side of the transfer switch After five attempts to move the transfer switch the Utility Connected LED flashes indicating that it failed to open For information on how to correct this prob lem refer to page 2 22 After Power Returns the Transfer Switch Does Not Return To Normal Position 1 Check to see if the Utility Power Available LED is lit If the Utility Power Available LED is lit a The retransfer time delay period may not have expired The TDEN can be set for up to 30 minutes If you do not wish to wait until the time delay expires press the Override pushbutton If the switch does not transfer after pressing the Override pushbutton a time delay ele vator TDEL may not have expired due to a misconfiguration The TDEL can be set up to 300 seconds Change the TDEL 10 0 sec onds FOR TDEN CODE bold italics O O O 0 Minutes Disabled _ OO e Mme O
23. of these functions are set at the factory and should not be adjusted If some of these functions are modified the transfer switch may not operate correctly Incorrect settings can result in the transfer switch failing to operate correctly Only authorized trained personnel should make changes to the control function settings Con trol functions marked grey in Table 2 2 are made at the factory and should not require any addi tional adjustments Time Delay Program Transition The Time Delay Program Transition TDPT feature is designed to have a transfer switch pause in the Neutral position not connected to either power source for an adjustable period of time whenever there is a transfer from one power source to anoth er When the TDPT is set to more than zero the transfer switch opens the normally closed side waits for the time delay to expire and then closes the normally open side of the transfer switch Since the RSS transfer switch does not include a Neutral position adjusting this value will have no effect on 15 operation Time Delay Elevator Signal The Time Delay Elevator TDEL Pre transfer fea ture is designed for use only with elevator control systems This function should never be used in home installations If a TDEL is set and the control is in an active Test or Exercise sequence the control adds the additional time delay prior to completing the transfer If there is an active TDEL pressing the Override will h
24. personal injury or death Use extreme caution to avoid touching electrical contacts with body tools jewelry hair clothes etc Prior to working with live circuits remove all sources of AC power The following procedures are to be performed only by technically trained and experienced personnel Improper operation of the generator presents a hazard that can cause severe personal injury or death Observe all safety precautions in your generator manuals Indicator Utility Power Available LED is off Utility Power Available LED is on age sensor inputs There may be improper utility voltage be tween the transfer switch power terminals A time delay emergency to normal TDEN may be timing There may be an active retransfer inhibit input resulting from a connected ground at 4 6 The retransfer inhibit feature is not offered with the RSS transfer switch Although it is not offered with this transfer switch a Phase Check may be enabled and the sources are not in phase 2 23 Possible Cause Corrective Action There may be improper voltage at the volt 1 Check for proper utility voltage between P3 5 and P3 9 line to line of the control ler connector Voltage must be higher than the utility voltage sensor pickup point a Check voltage sensing wiring between the control and the transfer switch b Make sure the utility voltage sensing pickup setting and dropout setting aren t both set at 9096
25. position input P4 7 to see if limit switch ASW opens If ASW doesn t open the control de energizes K2 waits 10 seconds and tries again If ASW doesn t open after the fifth try the Utility Connected LED flashes and the control quits trying If the switch mechanism is stuck or the sole noids are burnt out the switch will not transfer the load 2 22 1 2 3 Check the Close Generator circuit for a bad connection open wire or a faulty part Check K2 or the continuity through B1 and B2 of the transfer switch Press the Override pushbutton to reset the control so it will try to open the Utility side of the transfer switch Observe what happens and verify that the relay coils are energizing a If the coils are energizing Check the wiring between the relays and the transfer switch Check to see if the transfer switch is faulty b The coils are not energizing Check the wiring between the relay and the control Check to see if the K2 relay is faulty Use the manual operation handle to manually operate the transfer switch a If the switch will not allow manual opera tion it must be replaced b If the switch will allow manual operation but the solenoids are burnt out replace the transfer switch UTILITY POWER IS RESTORED TABLE 2 7 UTILITY POWER IS RESTORED BUT THE SWITCH DOES NOT TRANSFER TO THE UTILITY AC power within the cabinet presents a shock hazard that can cause severe
26. selector switch to Stop disconnect AC line power disconnect the battery charger from its AC power source and disconnect the starting battery negative lead first 1 Remove all sources of power from the transfer switch in the following order a Move the operation selector switch on the generator to Stop Off Always disconnect a battery charger from its AC source before discon necting the battery cables Otherwise dis connecting the cables can result in voltage spikes high enough to damage the DC con trol circuits b If there is an external battery charger dis connect the battery charger from its AC power source Ignition of explosive battery gases can cause severe personal injury Do not smoke or cause any spark arc or flame while servicing batteries Accidental starting of the gen erator can cause severe personal injury or death due to electrocution or contact with moving parts Disconnect the starting bat tery cables before performing service Bat teries emit hydrogen a highly explosive gas Thoroughly ventilate the battery compartment before removing battery cables Remove the negative cable s first to reduce the risk of arcing c Disconnect the generator starting battery negative lead first If the cabinet must be opened for any reason remove AC power to the au tomatic transfer switch If the instructions require otherwise use extreme caution due to the danger of shock hazard
27. set Service Manual 300 Seconds FUNCTION CODE VALUE VALUE Default in FOR TDEL CODE bold italics 0 Seconds Disabled OR oe ism O 2Seconds o Of SSeods c e Sew e Sed 300 Seconds System Does Not Test With Load The default setting for the RSS transfer switch is to test without load This procedure only applies if you expect the unit to test with load AC power within the cabinet pres ents a shock hazard that can cause severe per sonal injury or death Whenever the cabinet panel is removed use extreme caution to avoid touching electrical contacts with body tools jewelry clothes hair etc b There may be an active transfer inhibit If transfer inhibit is enabled the load transfer will not take place until the Override push button on the control panel is pressed or the transfer inhibit input is disabled 1 Check the control setting to verify that the Test With Without Load function has been set to With Load 2 Press the Test button If the switch does not Test With Load NOTE If a transfer inhibit is present the trans fer switch is miswired This feature is not to be used with the RSS transfer switch On the controller the transfer inhibit P4 5 and retransfer inhibit P4 6 should not be wired a The transfer time delay may not have ex pired The TDNE can be set for up to 300 seconds If you do not wish to wait until the time delay
28. starting battery negative lead first b If there is an external battery charger recon nect the battery charger to its AC power source c Restore AC power to the automatic transfer switch d Move the operation selector switch on the generator to the Remote or Auto position ORN 240VAC 3 i 0 Hz mA _ 25m MAXLOAD VA GRN FIGURE 4 9 SIGNAL TRANSFORMER 5 Parts Information This section includes information on replaceable controller and transfer switches that don t include a parts used with RSS transfer switches that include a controller see Figure 5 1 TRANSFER SWITCH WITH CONTROLLER TRANSFER SWITCH WITHOUT CONTROLLER FIGURE 5 1 RSS TRANSFER SWITCH TYPES 5 1 FIGURE 5 2 RSS TRANSFER SWITCH WITH A CONTROLLER 5 2 RSS Transfer Switch With A Controller REF PART QTY PART REF PART QTY PART NO NO USED DESCRIPTION NO NO USED DESCRIPTION 1 Transfer Switch Mechanism 10 323 2170 04 1 Controller Connector 9 Pin Includes Items 2 and 3 P3 306 5191 1 RSS100 11 323 1678 08 1 Controller Connector 8 Pin 306 5192 1 RSS200 P4 92 308 1235 2 Limit Switch ASW and BSW 12 323 1678 20 1 Controller Connector 9 Pin 3 319 6882 1 Terminal Cover Switch pem 5 ES A Mechanism attery Unarger e Amp 4 306 5297 1 Handle Manual Operation 14 319 6431 2 Bracket Mounting Battery 5 332 2370 2 Standoff Insulated 337_3
29. to activate Transfer Inhibit Inputs Connect to 4 1 to activate Retransfer Inhibit Connected to Utility Connect to 4 1 to activate when Normal connected to utility power Connect to 4 1 to activate Connected to Generator Connect to 4 1 to activate when Emergency connected to the generator 1 Open Normal Utility Not applicable Grounded internally to energize close 2 Close Normal Utility normal K1 relay Open Emergency Generator 4 Close Emergency Outputs Grounded internally to energize close Generator emergency 2 relay Elevator Pretransfer Not applicable EX Generator Start Relay Internal dry contact closes de energizes to start the generator Not applicable and is held open energized to stop the generator 08 Ground Input m Input 8 35 volts DC NOTE L3 Utility is not available on 2 pole transfer switches 7 Generator Start Relay These features are not offered with the RSS transfer switch SEQUENCE OF EVENTS The control executes a prescribed sequence of events for all transfer switch operations Utility to Generator Sequence of Events The following describes the sequence of events for an RSS transfer switch during a utility power fail ure this example is set higher than zero TDPT and TDEL are set to zero and phase check is not enabled The following steps describe what normally hap pens when the transfer switch is connected to the Ut
30. 100 transfer switch Frequency 60Hz and Figure 1 5 for the RSS200 transfer switch Application y lo enerator Enclosure Rating Type 3h Wiring Dagram 0630 328 Interconnection Diagram 0630 225 CUMMINS ONAN Model No R 100 6634 Modele Serial No Ser ie Current Rating 100 AMPS Voltage Rating 240 VAC IPH Poles 2 Frequency 00117 Application Utility Generator Enclosure Rating 3R Wiring Dagram 0630 328 Interconnection Diagram 0630 2232 Outline Drawing 0500 4503 Use Copper Or Aluminum Wire For Power Connections Use 60 C Rated Wire 14 To t AWG Use 75 C Rated Wire 1 0 AWG And Larger Control circuit wiring must be installed in conduit Do install in conduit with AC power wiring For Electrical Equipment Only Pour Material Electrique Seul Outline Drawing 0500 4502 Use Copper Or Aluminum Wire For Power Connections Use 60 C Rated Wire 14 To t AWG FIGURE 1 5 RSS200 WITH CONTROL DISPLAY Use 15 C Rated Wire 1 0 AWG NAMEPLATE And Larger Control circuit wiring must be installed in conduit Do not install in conduit with AC power wiring For Electrical Equipment Only Pour Material Electrique Seul FIGURE 1 4 RSS100 WITH CONTROL DISPLAY NAMEPLATE 1 3 Transfer Switches Without a Controller The nameplate for transfer switches without a con troller one circuit breaker is located inside the cab inet on the
31. 3 Reinstall the cabinet door panel s 14 Restore power CONTROLLER SWITCH MECHANISM DF WIRE CONNECTOR BUS WIRE CONNECTOR ENCLOSURE lt a BUSBAR Reconnect the generator starting battery negative lead first If there is an external battery charger recon nect the battery charger to its AC power source Restore AC power to the automatic transfer Switch Move the operation selector switch on the generator to the Remote or Auto position BATTERY CHARGER SENSING CONNECTOR QUICK CONNECT TERMINAL 3 STANDOFF NEUTRAL BAR ASSEMBLY 7 GROUND LUGS 2 FIGURE 4 1 INTERIOR COMPONENTS FOR TRANSFER SWITCH WITH CONTROLLER 4 2 BUS BARS CIRCUIT SWITCH MECHANISM BREAKER RELAY COIL K1 BATTERY CHARGER NEUTRAL BAR ASSEMBLY w GROUND LUGS FIGURE 4 2 INTERIOR COMPONENTS FOR TRANSFER SWITCH WITHOUT CONTROLLER ONE CIRCUIT BREAKER 4 3 MOUNTING HARDWARE AS S V2 m A LIMIT SWITCHES TRANSFER SWITCH FIGURE 4 3 TRANSFER SWITCH REMOVAL 4 4 LIMIT SWITCH REPLACEMENT PROCEDURE The transfer switch presents a shock hazard that can cause severe personal injury or death Before beginning installation remove all sources of AC power If a generator provides emergency power move the generat
32. 8140 51 2 831111238 390198 192 401 83839 OL 43121 02 51 SLY N3HM 4 eS OL Q3193NNO2 51 SLV N3HM N3dO 15 YINYOISNVYL NMOQ 9315 11 HOLIMS u3dSNVul OILVWOLAVY 51 HOLIMS AYVITIXAV 10111504 YOLVYINID MSE HOLIMS NOILISOd ALI TI LO MSV 45018 IWNIWYSL val 18 2 LHM Qqazi9H3N3 QN3931 2 35435 11111117 0111504 HOLIMS JSN3S 111111 E YOLVYINID NOILISOd HOLIMS 103103 HOLIMS 345 1 34 0 9 14 08 NIVW N VN 114405 3 2 Generator to Utility Sequence of Events The following steps describe what normally hap pens when the transfer switch is connected to the generator utility power returns and the switch moves from the generator to the utility see Figure 3 3 1 The utility returns 2 The generator control receives a signal from 4 1 4 2 of the step down transformer to indicate that utility power is available 3 The generator control signals the relay coil K1 energizing the relay coil which opens K1 1 K1 9 and 1 2 1 10 and closes K1 7 K1 11 and K1 8 K1 12 to move the trans fer switch from the Generator position to the Utility position The S1 auxiliary switch within the transfer switch mechanism breaks the sig nal to the ATS operator coil C 4 relay de energizes opening K1 7 K1 11 and K1 8 K1 12 and closing K1 1 K1 9 and K1 2 K1 10 to move the transfer switc
33. 9 7055 1 Door Panel Outer Mechanical 21 319 7056 1 Door Panel Inner 332 3084 7 RSS100 22 Circuit Breaker 332 3038 4 RSS200 320 2473 01 1 RSS100 8 332 3647 5 Lug Ground 320 2473 02 1 RSS200 9 338 5058 1 Harness 23 315 1731 1 Transformer 9 5 THIS PAGE LEFT INTENTIONALLY BLANK 5 6 6 Wiring Diagrams SCHEMATIC PAGE Figure 6 1 Figure 6 2 Figure 6 3 Figure 6 4 Figure 6 5 Figure 6 6 Figure 6 7 Figure 6 8 RSS Transfer Switch With Controller Wiring Diagram 855 Transfer Switch Without Controller Wiring Diagram Interconnection Wiring Diagram for GGDB All Specs Generators Interconnection Wiring Diagram for Generator Series FD FE DB GGHE and GGHF Interconnection Wiring Diagram for Generators with PowerCommand 2100 Control E Interconnection Wiring Diagram With Controller for Generator Series GSAA Interconnection Wiring Diagram for Generators with PowerCommand 1301 Control S LM T IM Interconnection Wiring Diagram Without Controller for Generator Series GSAA 6 1 6 4 6 6 6 7 c 30 L 133HS HLIA HOLIMS H33JSNVHLI 559 1 9 400 0 c 10 US N d3 144115 YOLVYINID v3 TOULNOD YOLVYIANAD 01 806 069 114415 Ad311V8 13SN39 4 4819
34. 927 1 E SERE 16 307 3076 2 Base Relay 337 3982 1 RSS200 17 307 3077 4 Bracket Relay Clip 7 MO O RR 18 332 4373 02 1 Terminal Block 6 Pole ug Mechanical Neutral an 19 098 8422 04 1 Label Terminal Block Mechanical 20 332 4144 2 End Cap Terminal Block 332 3084 9 RSS100 21 332 4145 3 End Bracket Terminal 332 3038 9 RSS200 22 300 5965 1 Control Display Line to Line 8 332 3647 2 Lug Ground Voltage Sensing 51310 9 1 Harness Includes Items 10 23 319 6881 1 Bracket Controller Mounting 11 and 12 24 098 8692 1 Label Customer Connection 338 4994 1 RSS100 25 319 6880 1 Door Panel RSS100 338 5007 1 RSS200 26 319 6894 1 Door Panel RSS200 5 3 FIGURE 5 3 RSS TRANSFER SWITCH WITHOUT A CONTROLLER 5 4 RSS Transfer Switch Without A Controller REF PART QTY PART REF PART QTY PART NO NO USED DESCRIPTION NO NO USED DESCRIPTION 1 Transfer Switch Mechanism 10 300 6588 1 Battery Charger 2 Amp Includes Items 2 and 3 11 319 6431 2 Bracket Mounting Battery 306 5191 1 RSS100 Charger 22 12 307 3146 1 Relay Control imit Switc 2 3 319 6882 1 Terminal Cover Switch 5 Clip Mechanism 15 332 4373 01 1 Terminal Block 10 Pole 22 11 Ba 16 098 8422 01 1 Label Terminal Block 6 Neutral Bus Bar 17 332 4144 2 End Cap Terminal Block 337 3942 RSS100 18 332 4145 2 End Bracket Terminal 337 3984 RSS200 19 098 8803 1 Label Customer Connection 7 Lug Mechanical Neutral and 20 31
35. AY YOLVYANAD QN35931 JHL OL Q3L93NNOO SI HOLIMS H34SNVH SN3iddVH ATIVINHON LVHM dO 6540 V 5 Au311V8 SNOTLIANNOD 4 01 OL 03123NNO2 NEUES E T TWWYON OL 131232880251 SLY N3HM 51340 IS HOLIMS 433JSNVUL OILVNOLRV SLY HOLIMS AdVI TIXQV NOILISOd 158 HOLIMS AYVITIXAY 111504 IVNHON MSV AV134 AON39U3N3 150109 AV134 IWNYON 35012 OL 035015 HOLIMS 48315 1 03719893N3 3Q0 NMOHS 321A3Q 11 N N 83 114415 14415 ALI TIU YOLVYINID V3 VN 1041800 YOLVYINIAD 01 L Mau 14941 5 19715 Ad311V8 115139 135139 2 81 28 8l 1 81 512 1 02 AUVITIXAY 11 5 O 1531 410038 EIE ONISN3S 3811 OL INIT B B 3 2 104 6 54 2 18 TROUBLESHOOTING WITH SYMPTOMS Use the troubleshooting guide to help diagnose transfer switch problems It is divided into sections based on the symptom Common problems are listed with their possible causes Refer to the cor rective action column for the appropriate test or ad justment procedure The section page number in the right column lists the location of the test or ad justment procedure in the manual Conditional schematics are used to highlight the cir cuit that is energized during the sequence of the events These conditional schematics are fo
36. As with the TDEL function listed above the Elevator Post Transfer Delay function is designed for use only with elevator control systems This function should never be used in home installations If the the Elevator Post Transfer Delay function is set to On the control adds the TDEL time delay af ter the transfer switch transfers the load to the new power source If there is an active TDEL pressing the Override will have no effect on this time delay Make sure that the the Elevator Post Transfer Delay is always set to Off ACCESSING THE FRONT PANEL CONFIGURATION EDITOR AC power within the cabinet and the rear side of the cabinet door presents a shock hazard that can cause severe personal injury or death Use extreme caution to avoid touching electrical contacts whenever the cabinet door is open Battery power DC power must be available to con figure the control panel functions AC power may be present but doesn t have to be present to configure the control panel To check for DC power open the transfer switch door and place the ATS in the Nor mal or Emergency position The Utility Power Con nected or Genset Power Connected LED should light Configuration Mode is selected by operation of a small slide switch located on the back of the control panel The switch is located near the bottom edge of the PCB see Figure 2 2 The switch is partially hid den to prevent accidental operation NOTE The Configuration Mode can
37. CUMMINS GENERATOR SET SERIES GSAA UTILITY SENSE 1 UTILITY SENSE TRANSFERSWI TCH CONTROL SEE NOTE THIS INTERCONNECTION DIAGRAM MENTIONS THE CONNECTION TO TB1 5 IN THE GENERATOR THE CONNECTION IS MARKED SWITCH POSITION UTILITY BUT IT IS CONNECTED TO REMOTE START IN NOTE SIZE WIRES AS FOLLOWS WIRE SIZE AWG DISTANCE IN FEET ONE WAY 55 25 i NORMAL EMERGENCY LEADS ARE SIZED FOR LOAD AND LENGTH JUMPER LEAD PART NO 0226 4404 04 IS PROVIDED INSIDE THE LITERATURE PACKING LOT NORMAL POWER LEFT SIDE TB REMOTE TEST POWER SWITCH POSITION GENERATOR THE TRANSFER SWITCH TB2 4 ALTHOUGH IT LOOKS LIKE THE WRONG DESCRIPTION THIS CONNECTION IS CORRECT FIGURE 6 6 INTERCONNECTION WIRING DIAGRAM WITH CONTROLLER FOR GENERATOR SERIES GSAA No 630 2252 Rev J Modified 7 2007 6 9 REMOTE START EMERGENCY POWERCOMMAND 1301 CONTROL OPTIONAL OUTPUT RELAYS 14 13 31 181 10 2 REMOTE START JI 1 1 2 SEE NOTE 4 CONFIGURABLE INPUT 12 CONFIGURABLE INPUT 21 13 CONFIGURABLE INPUT 71 14 NOTES CONNECTIONS TO TBI 10 THRU 16 ARE FOR CUSTOMER USE AND MAY BE CONFIGURED TO DISPLAY CUSTOM ALARM MESSAGES ON GENSET CONTROL LOW FUEL IS REQUIRED FOR NFPAIIO COMPLIANCE CONTACTS MUST BE GROUNDED 2 IF CONTROL BATTERY POWER IS RUN IN A COMMON CONDUIT WITH THE NETWORK WIRING FUSE SHOULD O
38. E 2 2 ADJUSTABLE TRANSFER SWITCH FUNCTIONS FUNCTION FUNCTION CODE VALUE CODE VALUE Default in bold italics Not Available m TDES Time Delay Engine Start 2 gt 2 gt 2 gt 0 Seconds Disabled 0 5 Second 1 Second 2 Seconds 3 Seconds 4 Seconds 6 Seconds 10 Seconds 0 Seconds Disabled 1 Second TDNE Time Delay Normal to Emergenc gency 2 Seconds 3 Seconds 5 Seconds 30 Seconds 120 Seconds 300 Seconds 0 Minutes Disabled 0 1 Minutes For Testing 5 Minutes 10 Minutes 15 Minutes 20 Minutes 25 Minutes 30 Minutes 0 Minutes Disabled 0 1 Minutes For Testing 5 Minutes 10 Minutes 15 Minutes 20 Minutes 25 Minutes 30 Minutes 0 Seconds Disabled 0 5 Seconds 1 Second 2 Seconds 3 Seconds 4 Seconds 6 Seconds 10 Seconds 0 Seconds Disabled 1 Second 2 Seconds 3 Seconds 5 Seconds 30 Seconds 120 Seconds 300 Seconds TDEN Time Delay Emergency to Normal TDEC Time Delay Engine Cooldown TDPT Time Delay Program Transition The RSS transfer switch does not use this function TDEE Time Delay Elevator Signal The RSS transfer switch does not use this function 2 5 TABLE 2 2 ADJUSTABLE TRANSFER SWITCH FUNCTIONS FUNCTION FUNCTION CODE VALUE CODE VALUE Default in bold italics Test With Without Load e e O O Without Load With Load External Exercise On Off Exercise With Without Load System Nominal
39. MAL EMERGENCY LEADS ARE SIZED FOR LOAD AND LENGTH SEE NOTE SEE NOTE 2 NORMAL LEFT SIDE TB REMOTE START EMERGENCY REMOTE TEST POWER SWITCH POSITION GENERATOR No 630 2252 Sh 2 of 8 Rev J Modified 7 2007 FIGURE 6 3 INTERCONNECTION WIRING DIAGRAM FOR GGDB ALL SPECS GENERATORS 6 6 ONAN CUMMINS GENERATOR SERIES FD FE DB GGHE GGHF ENGINE CONTROL PANEL TO B TERMINAL ON STARTER 3 SEE NOTE SIZE WIRES AS FOLLOWS WIRE SIZE AWG DISTANCE IN FEET ONE WAY plo ue c gu 22220204 2 NORMAL EMERGENCY LEADS ARE SIZED FOR LOAD AND LENGTH NORMAL CERTE IDE REMOTE START EMERGENCY REMOTE TEST POWER SWITCH POSITION GENERATOR No 630 2252 Sh 3 of 8 Rev J Modified 7 2007 FIGURE 6 4 INTERCONNECTION WIRING DIAGRAM FOR GENERATOR SERIES FD FE DB GGHE AND GGHF 6 7 00122024 0012 GNVINIWOOH3MOd 5NIHIM 9 9 4 2002 1 810945 cScc 0 9 ON 7 0 9 110 335 8018144319 10111504 HOLIMS 3 04 1531 310839 39843 3 14115 310138 g VLIVG IWLLIWGNS NO 01318182540 SV S JJYNOS 8 8 089 3401 1331 10113303 9014 JYWYON YOLVIONANNY 6189 008 124005 IVA OFZ MO 021 G 335 j9VX2Vd 135 39 310 335 431V3H 1318 15 YO
40. NEOUS TROUBLESHOOTING ISSUES AC power within the cabinet presents a shock hazard that can cause severe personal injury or death Use extreme caution to avoid touching electrical contacts with body tools jewelry hair clothes etc Prior to working with live circuits remove all sources of AC power The following procedures are to be performed only by technically trained and experienced personnel Improper operation of the generator presents a hazard that can cause severe personal injury or death Observe all safety precautions in your generator manuals Possible Cause Corrective Action Generator running for no apparent rea son Front panel test doesn t transfer the load Unit did not exercise The generator may not have received stop signal The selector switch on generator control panel may not be in the correct position There may be defective wiring The generator control may not be ating correctly The control is not set to Test With Load The control is set to Test With Load but one of the following has occurred a The transfer time delay may not have expired b Although it is not offered with this transfer switch a phase check may be enabled 1 The operation selector switch on the generator may not be in the correct posi tion 2 An exercise period may not be set or is set but not yet started 3 There may be generator problems 2 26 Check for
41. OLLVINSHOS 1VO9IdAL E z ADVd 8 54315 935 YOLVYANAD JHL OL 5 45 1 HOLIMS 1320 YSMOd ALMILN ALNILN QN3931 d343193NNOO SI HOLIMS H34JSNVH L JHL NSHM MM SN3ddVH ATIVIWHON LVHM dO NOlLdlHOS3Q V 445 5340 0101 431311238 390148 190 A9N39U3N3 OL 03123NNO2 SI SLY N3HM 58340 25 N a1 OL 03123NNO2 SI SLY N3HM 51340 15 HOLINS NOLLISOd VNHON OL 435012 HOLIMS 333SNVMI HLIM 0321993N3 30 NMOHS 33V 321 30 71 HOLIMS AuVITIXQV NOILISOd MSV 49738 35012 2 SFION Ed EI 3 0 41738 TYWYON 35012 LY N N 83 gN 114405 1440 YOLVYINGD V3 VN 1041802 801 41 39 01 aen 114415 1915 14311 8 13SN39 13SN39 2 2819 Qr zdi 2019 91 281 SLOVLNOO AVI TIE XRV HOLIMS 1531 310038 ONISN3S 3 11 OL 3 11 108 1 64 9 64 6 64 2 16 Generator to Utility Sequence of Events The following describes the sequence of events for an RSS transfer switch that occur after the load has been transferred to the generator and then utility power is restored In this example the TDEN is set higher than zero TDPT and TDEL are set to zero and phase check is not enabled The following steps describe what normally hap pens when the transfer switch is connected to the generator utility pow
42. PTIONAL CONTROL BE CHANGED TO 2A RATED DEVICE HEATER 3 MAXIMUM WIRE SIZE ON TBI 15 12 AWG WIRING MUST BE STRANDED 4 SIZE WIRES AS FOLLOWS WIRE SIZE AWG DISTANCE IN PEET ONE WAY C Mo 1 3 OPTIONAL COOLANT AND OR ALTERNATOR STARTER HEATERS GENSET PACKAGE 5 NORMAL EMERGENCY LEADS ARE SIZED FOR LOAD AND LENGTH OF RUN 6 JUMPER LEAD PART NO 0226 4404 04 15 PROVIDED 120 OR 240 VAC SOURCE PLUG CONNECTION INSIDE THE LITERATURE PACKING LIST AC SOURCE S AS DESCRIBED NORMAL ON SUBMITTAL DATA LEFT SIDE 3 EMERGENCY POWER JUMPER GENERATOR SEE NOTE 6 No 630 2252 Sh 8 of 8 Rev J Modified 7 2007 FIGURE 6 7 INTERCONNECTION WIRING DIAGRAM FOR GENERATORS WITH POWERCOMMAND 1301 CONTROL PCC1301 6 10 Generator Transfer Switch UTILITY SENSE 1 TB1 1 UTILITY SENSE 1 UTILITY SENSE 2 TB1 2 UTILITY SENSE 2 TRANSFERSWITCH CONTRHOL TB1 3 TRANSFER SWITCH CONTROL B 781 4 B SWITCH POSITION UTILITY 1 5 SWITCH POSITION UTILITY SWITCH POSITION GENERATORH TB1 6 SWITCH POSITION GENERATOR LOAD CONTROL 1 1 4 7 LOAD CONTROL 2 TB1 8 RS485 A TB1 9 RS485 B 1 10 B 1 11 HARNESS SUPPLIED DISPLAY WAKEUP 1 12 NOTES 1 ALL WIRING AND RELAYS ON THIS PAGE ARE CUSTOMER SUPPLIED CHANGES TO THIS DIAGRAM SHEET MUST BE TRANSFERED TO 0098 8775 LABEL 0098 8773 MUST BE UPDATED WITH 0630 3514 UPDATES No 630 3514 Sh 2 of 2 Rev B
43. Voltage Table Selection oystem Nominal Voltage Table 1 Per customer order Without Load With Load Voltage Table 1 Voltage Table 2 ak mere 120 190 208 220 230 240 O e O System Nominal Voltage Table 2 Per customer order O O O O O N 60 Hz 50 Hz Three Phase Single Phase 90 95 90 85 80 70 System Nominal Frequency 50 60 Hz Single Phase Three Phase Utility Undervoltage Pickup Utility Undervoltage Dropout Return to Programmed Transition On Off The RSS transfer switch does not use this function O gt O 5 Elevator Post Transfer Delay Off On Off The RSS transfer switch does not use this function Exercise Repeat Interval Every 7 Days Every 14 Days Every 21 Days Every 28 Days EE THESE CONTROL FUNCTIONS ARE SET AT THE FACTORY AND SHOULD NOT REQUIRE ADJUSTING 2 6 PRELIMINARY TROUBLESHOOTING PROCEDURES The following procedures describe preliminary trou bleshooting checks These checks can be used by service personnel If the trouble persists call your dealer or distributor Some transfer switch service pro cedures present hazards that can result in se vere personal injury or death Only trained and experienced service personnel with knowledge of electricity and machinery hazards should perform serv
44. a generator stop signal open contact between P5 6 and P5 7 Check to see if the generator control is set for Remote Start Check inspect or replace defective wir ing see Figure 2 4 Check the generator control for proper operation Check the control setting to verify that the Test With Without Load function has been set to With Load If the control has been set to Test With Load a The TDNE can be set for up to 300 seconds If you do not wish to wait until the time delay expires press the Override pushbutton When the phase check function is enabled the generator does not as sume the load until both sources are within acceptable limits of the phase check sensor 1 Verify that the operation selector switch on the generator control panel is set to the Remote Auto position Check the Exercise LED on the control panel to see if it is lit a If the Exercise LED is not lit no exer cise period has been set Refer to the exerciser programming procedure for information on setting an exercise If the Exercise LED is lit but not flash ing the exercise period has not yet started Exercisers do not display ex ercise start and stop times 3 Try starting the generator using its start stop Run Off controls If it does not crank check the starting batteries and cable connections If it cranks but does not start check the fuel supply 3 Troubleshooting Transfer Swit
45. al operation but the solenoids are burnt out replace the transfer switch TABLE 2 8 SWITCH TRANSFERRED TO THE UTILITY BUT THE GENERATOR CONTINUES TO RUN AC power within the cabinet presents a shock hazard that can cause severe personal injury or death Use extreme caution to avoid touching electrical contacts with body tools jewelry hair clothes etc Prior to working with live circuits remove all sources of AC power The following procedures are to be performed only by technically trained and experienced personnel Improper operation of the generator presents a hazard that can cause severe personal injury or death Observe all safety precautions in your generator manuals Possible Cause Corrective Action Generator did not Atime delay engine cooldown TDEC Wait for the time delay up to 30 min shut down after the may be timing utes to expire transfer switch has The generator may not have received a Check for a generator stop signal open transferred to the Uti stop signal contact between P5 6 and P5 7 lit d The selector switch on generator control Check to see if the generator control is panel may not be in the correct position set for Remote Start There may be defective wiring Check inspect or replace defective wi ring see Figure 2 4 The generator control may not be oper Check the generator control for proper ating correctly operation 2 25 TABLE 2 9 MISCELLANEOUS MISCELLA
46. ave no effect on this time delay Make sure that the TDEL is always set to zero seconds External Exercise On Off The RSS transfer switch includes an internal exer ciser Therefore the External Exercise On Off fea ture is set to Off No external exerciser is available to be used with this transfer switch If the controller External Exercise On Off feature is set to On the internal exerciser will not function Make sure that this function is always set to Off System Nominal Voltage The control s system nominal voltage setting is set at the factory and must never be changed System Nominal Frequency 50 60 Hz The control s system nominal frequency setting is set at the factory and must never be changed Single Phase Three Phase The control s phase setting is set at the factory and must never be changed Return to Programmed Transition On Off If set to On the Return to Programmed Transition feature allows a transfer switch to return to Pro grammed Transition in the event that the switch fails to synchronize when the switch is transferring from one power source to another Since the RSS trans fer switch does not include the synchronizing fea ture this setting must always be set to Off If the Return to Programmed Transition feature is set to On the control will activate the Time Delay Program Transition but this will have no effect on operation Elevator Post Transfer Delay On Off
47. azard that can cause severe personal injury or death Observe all safety precautions in your generator manuals Possible Cause Corrective Action The transfer switch failed to The K1 relay coil may not have re 1 Check for a relay coil signal 12 transfer to the generator ceived a 12 VDC signal from con troller K1 relay may malfunction There may be a defective wire The switch mechanism solenoid may be burnt out There may be loose or broken parts within the switch mechanism VDC between TB4 3 and TB4 4 Verify the relay coils are energizing a If the coils are energizing Check the wiring between the relays and the transfer switch B1 and B2 It should be 240 VAC Check to see if the transfer switch is faulty b The coils are not energizing Check to see if the K1 relay is faulty If faulty replace the K1 relay Check inspect or replace the de fective wire Manually operate the switch by us ing the operator handle to manually transfer the switch If the switch manually transfers the solenoids are burnt out replace the switch mechanism Manually operate the switch by us ing the operator handle to manually transfer the switch If the switch does not manually transfer replace the switch mechanism TABLE 3 1 TROUBLESHOOTING THE TRANSFER SWITCH AC power within the cabinet door presents a shock hazard that can cause severe per sonal injur
48. be entered at any time but once it is selected all automat ic operation is suspended Modifying the Configuration The control has been configured at the factory and does not require additional adjustments default 151310 CONTROL PANEL SWITCH IN AUTOMATIC MODE CONFIGURATION MODE settings are shown in bold italics in Table 2 2 How ever if it becomes necessary to adjust settings Incorrect settings can result in the transfer switch failing to operate correctly Only authorized trained personnel should make changes to the control function settings Exter nal Exercise System Nominal Voltage System Nominal Frequency and Single Phase Three Phase settings are made at the factory and should not require any additional adjustments 1 Slide the selector switch to the Configuration Mode position TDES is always the first func tion shown when entering Configuration Mode 2 Press the Test pushbutton to scroll through the various control function codes displayed with the first five LEDs see Table 2 2 The black filled circles indicate which LEDs are lit for the function and value codes listed 3 Once the desired function is selected press the Override pushbutton to change the associ ated value code displayed with the last three LEDs 4 When configuration is completed return the selector switch back to the Automatic Mode position SWITCH IN FIGURE 2 2 NORMAL CONFIGURATION MODE SELECTOR SWITCH 2 4 TABL
49. ble of automatic operation without operator intervention perform the basic function of transferring the load to the avail able power source The controller monitors each source for allowable voltage and frequency range This automatic transfer switch capable of automat ic operation without operator intervention is de signed for utility to generator applications In utility to generator applications the transfer switch per forms the following functions Senses the interruption of utility power Sends a start signal to the generator Senses the generator is available Transfers the load to the generator Senses the return of utility power Retransfers the load to the utility Sends a stop signal to the generator UTILITY NORMAL POWER OVERCURRENT PROTECTIVE DEVICE CUSTOMER SUPPLIED OVERCURRENT PROTECTIVE DEVICE CUSTOMER SUPPLIED GENERATOR EMERGENCY POWER FIGURE 1 3 LOAD TRANSFER SWITCH TYPICAL FUNCTION MODEL IDENTIFICATION Identify your model by referring to the Model and CUMMINS ONAN Serial number as shown on the nameplate The Model No RSS200 6635 nameplate also includes electrical characteristics Modele serial No Transfer Switches With a Controller Serie Current Rating 200 AMPS The nameplate for transfer switches with a control Voltage Rating 240 VAC IPh ler is located inside the cabinet on the upper right Poes 2 side see Figure 1 4 for the RSS
50. ches Without a Controller This section describes troubleshooting issues for installations that include a GSAA generator With this type of installation the RSS transfer switch does not include a controller and is suitable for use with service equipment This section also describes the sequence of events for transfer switch operations that do not include a controller SEQUENCE OF EVENTS Utility to Generator Sequence of Events The following describes the sequence of events for an RSS transfer switch during a utility power fail ure The following steps describe what normally hap pens when the transfer switch is connected to the Utility utility power fails and the switch transfers to the Generator see Figure 3 2 1 While the transfer switch is connected to the utility the utility power fails After a three sec ond delay TDES the generator control starts the generator 2 After the generator warms up five second TDNE the generator control signals the relay coil K1 energizing the relay coil which opens K1 1 K1 9 and 1 2 1 10 closes K1 7 K1 11 and K1 8 K1 12 to move the trans fer switch from the Utility position to the Gener ator position The S2 auxiliary switch within the transfer switch mechanism breaks the signal to the ATS operator coil C 3 The K1 relay de energizes by opening K1 7 K1 11 and K1 8 K1 12 closing K1 1 K1 9 and K1 2 K1 10 4 Limit switch ASW removes the ground signal
51. d that can cause severe personal injury or death Observe all safety precautions in your generator manuals Possible Cause Corrective Action Generator cranks but does There may be a generator problem Check the fuel system Refer to the gen not start erator s service manual Generator does not crank 1 Atime delay engine start TDES may be timing There may not be a generator start signal The generator may not be waiting for a remote start command There may be defective or loose wiring There may be a defective battery or cables The generator control may not be functioning correctly 2 20 1 Wait until the time delay up to 10 seconds has expired or press the Override pushbutton on the control panel or ground the Override input Check for a generator start signal closed contact either between P5 6 P5 7 TB2 2 TB2 4 Verify that the generator control is set for Remote Auto Start Check inspect or replace defective wiring see Figure 2 3 Check the wiring between the trans fer switch and the generator control Check the batteries and cable con nections Check the generator control for proper operation TABLE 2 6 GENERATOR IS RUNNING BUT THE TRANSFER SWITCH DID NOT TRANSFER TO THE GENERATOR AC power within the cabinet presents a shock hazard that can cause severe personal injury or death Use extreme caution to avoid touching electrical contac
52. e Generator side of the transfer switch After 5 attempts to move the transfer switch the Generator Connected LED flashes indicat ing that it failed to open To close Utility the control grounds P5 1 P5 3 to energize K1 for 1 second and monitors the Generator position input P4 8 to see if limit switch BSW opens If BSW doesn t open the control de energizes K1 waits 10 seconds and tries again If BSW doesn t open after the fifth try the Generator Connected LED flashes and the control quits trying If the switch mechanism is stuck or the sole noids are burnt out the switch will not transfer the load 2 24 1 Check the Open Generator circuit for a bad connection open wire or a faulty part 2 Check K1 or the continuity through A1 and A2 of the transfer switch 3 Press the Override pushbutton to reset the control so it will try to open the Generator side of the transfer switch Observe what happens and verify that the relay coils are energizing a the coils are energizing Check the wiring between the re lays and the transfer switch Check to see if the transfer switch is faulty b If coils are not energizing Check the wiring between the relay and the control Check to see if the relay is faulty Use the manual operation handle to manu ally operate the transfer switch a If the switch will not allow manual op eration it must be replaced b If the switch will allow manu
53. e attempts to move the transfer switch the Generator Connected LED flashes indicating that it failed to open For information on how to correct this prob lem refer to page 2 24 Generator Continues to Run After Retransfer of Load to Normal Power AC power within the cabinet pres ents a shock hazard that can cause severe per sonal injury or death Whenever the cabinet panel is removed use extreme caution to avoid touching electrical contacts with body tools jewelry clothes hair etc 1 The engine cooldown time delay may not have expired The TDEC can be set for up to 30 min utes FOR TDEC CODE bold italics O O 0 Minutes Disabled e OMS O e Mimues O O Minutes o e e O 25 e _ cc 2 After the TDEC expires but the start signal relay remains closed the signal can measured with voltmeter either at P5 6 and P5 7 or at FUNCTION CODE VALUE VALUE Default in TB2 2 and TB2 4 The generator is still run FOR TDNE CODE bold italics 0 Seconds Disabled e Sen 00 Of Oe e sems o SSeconds le c e _ le o 105 __ ning a Stop the generator with its Start Stop Run Off switch b Replace the controller 3 After the TDEC expires but the start signal relay remains open and the generator contin ues to run refer to the generator
54. eds to be replaced If the voltage between TB2 1 GND and TB2 3 B for RSS transfer switches with a controller or between TB4 4 GND and TB4 7 B 855 transfer switches without a controller is less than 13 5 VDC the charger is weak Check the distance between the charger and the battery to see if it is too far Wiring distances are listed in Table 2 3 If the LED is flashing the charger is defective Replace the battery charger Ignition of explosive battery gases can cause severe personal injury Do not smoke or cause any spark or flame while servicing bat teries TABLE 2 3 WIRE SPECIFICATIONS Wire Size AWG 200 Battery Loses Water The battery charger may not be turning off when the battery is charged Refer to battery manufacturer s maintenance recommendations Battery Loses Charge There may be loose battery connections Verify connections are okay If they are okay replace the battery DETAILED TROUBLESHOOTING PROCEDURES This section describes a typical transfer switch se quence of events and provides detailed trouble shooting procedures for experienced service per sonnel The troubleshooting procedures use condi tional schematics and symptoms to diagnose all possible problems Improper operation of the genera tor presents a hazard that can cause severe per sonal injury or death Observe all safety precau tions in your generator manuals TROUBLESHOOTING Sequence of
55. elay coils are energizing a If the coils are energizing Check the voltage between the relays and the transfer switch A1 and A2 It should be 240 VAC Check to see if the transfer switch is faulty b The coils are not energizing Check to see if the K1 relay is faulty f faulty replace the K1 relay Check inspect or replace the de fective wire Manually operate the switch by us ing the operator handle to manually transfer the switch If the switch manually transfers the solenoids are burnt out replace the switch mechanism Manually operate the switch by us ing the operator handle to manually transfer the switch If the switch does not manually transfer replace the switch mechanism Check the wiring connection and verify the signal Replace the limit switch 4 Transfer Switch Service This section covers the removal and replacement procedures for RSS transfer switch components SWITCH ASSEMBLY REMOVAL AND REPLACEMENT PROCEDURE For servicing purposes the transfer switch as sembly must be removed and replaced as a unit There are no serviceable components The transfer switch presents a shock hazard that can cause severe personal injury or death Before beginning installation remove all sources of AC power If a generator provides emergency power move the generator operation selector switch to Stop disconnect AC line power disconnect the battery charger
56. er returns and the switch moves from the generator to the utility see Figure 2 4 1 The utility returns The Utility Power Available LED lights 2 Atime delay emergency to normal TDEN be gins 3 After the TDEN timer expires the Open Emer gency P5 3 and Close Normal P5 2 output is grounded energizing the K1 relay coil clos ing the normally open K2 contacts K1 8 K1 12 and K1 5 K 9 to move the transfer switch to the Utility The S1 auxiliary switch within the switch mechanism breaks the signal to the ATS operator coil C Limit switch BSW removes the ground signal from P4 8 signaling the ATS has disconnected from the generator The Generator Connected LED goes out and limit switch ASW provides a ground signal to P4 7 signaling that the trans fer switch has transferred the load then the Utility Connected LED lights and the K1 relay coil is de energized opening K1 8 K1 12 and 1 5 1 9 The control starts the time delay engine cool down TDEC timer When the TDEC timer expires the P5 6 to P5 7 contact opens the generator stops running and the Generator Power Available LED goes Out 7 The load is retransferred to the utility ALFTLLO AHL OL JHL H33SNVHL SNYNLAY ALNILN 7 S9ILVW3HOS TVNOLLIINOO IVOIdAL v z 39Vd 9 54315 33S ALMILN OL MOVE 5 45 1 HOLIMS a3ZzIDH3N3 SNYNL
57. f the controller is connected to a DC power source for example the generator start bat tery but there is no AC power available the control panel Connected LED will still be lit The transfer and retransfer relays K1 and K2 are pulsed and are powered for only one sec ond or until an limit switches ASW or BSW changes state and then the power is removed the relays are de energized When a relay is being energized there is an audible click The software includes a retry function If the transfer switch fails to transfer within one sec ond power is removed and the software waits ten seconds before trying again After five at tempts the software quits trying and either the Utility Connected LED or the Generator Con nected LED flashes depending on which part of the switch circuit has failed All operations are then locked out until the software is reset by pressing the Override pushbutton on the con trol panel UTILITY POWER FAILURE TABLE 2 5 UTILITY POWER FAILS BUT THE GENERATOR DOES NOT START AC power within the cabinet door presents a shock hazard that can cause severe per sonal injury or death Use extreme caution to avoid touching electrical contacts with body tools jewelry hair clothes etc Prior to working with live circuits remove all sources of AC power The following procedures are to be performed only by technically trained and experienced personnel Improper operation of the generator presents a hazar
58. h mechanism signal to the ATS operator coil C 5 Limit switch BSW removes the ground signal 4 6 signaling the transfer switch has dis connected from the Generator then the ASW limit switch provides a ground signal to TB4 5 signaling that the transfer switch has con nected to the Utility The generator control re ceives a signal to indicate switch position on the Utility side 6 The load is transferred to the Utility 7 After a ten minute delay to let the engine cool down TDEC the generator stops TROUBLESHOOTING WITH SYMPTOMS Use the troubleshooting guide to help diagnose transfer switch problems It is divided into sections based on the symptom Common problems are listed with their possible causes Refer to the cor rective action column for the appropriate test or ad justment procedure The section page number in 3 3 the right column lists the location of the test or ad justment procedure in the manual Conditional schematics are used to highlight the cir cuit that is energized during the sequence of the events These conditional schematics are for a typi cal transfer switch with options Always refer to the schematic and wiring diagram package that was shipped with the transfer switch for specific informa tion about its configuration Make a thorough inspection of the transfer switch wiring to make sure that good wire harness and ground connections are made Correct wiring prob lems before perfor
59. he output lugs of the generator Check the control setting to verify that the system nominal voltage matches what is listed on the nameplate of the transfer switch and generator Check the control setting to verify that the system frequency matches what is listed on the nameplate of the transfer switch and generator Check the control setting to verify that the system phase setting matches what is listed on the nameplate If the Generator Power Available LED is lit a The transfer time delay may not have ex pired The TDNE can be set for up to 300 seconds If you do not wish to wait until the time delay expires press the Override pushbutton If the switch does not transfer after pressing the Override pushbutton a time delay ele vator TDEL may not have expired due to a misconfiguration The TDEL can be set up to 300 seconds Change the TDEL 10 0 sec onds FUNCTION CODE VALUE VALUE Default in FOR TDNE CODE bold italics 0 Seconds Disabled Oy Aa oO 30 Seconds 120 Seconds 25650 _ e 09 seconds __ eco e e sooSeods FUNCTION CODE VALUE VALUE Default in FOR TDEL CODE bold italics OJO O O 0Seconas Disabled iSemd 00 O sens Oe e sens O SSeods e Sens e Sed e __ There may be an active transfer inhibit transfer inhibit is enabled the load transfer will
60. hout Controller One Circuit Break er Access to the circuit breaker can be obtained by removing the outer door panel An internal panel must be removed to gain access to transfer switch components Refer to the wiring diagrams at the end of this manu al for specific information about switch configura tion Use normal and necessary safety precautions be fore starting any service procedure Identify all haz ards by referring to the Safety Precautions portion of this manual and by observing all warnings and cautions within the manual Whenever you are trou bleshooting remember that the generator set the transfer switch and the utility power source are all interdependent TRANSFER SWITCH APPLICATION Transfer switches are an essential part of a build ing s standby or emergency power system The util ity line normal power is backed up by a generator emergency power The transfer switch automati cally switches the electrical load from one source to the other The load is connected to the common of the transfer switch Figure 1 1 Under normal conditions the load is supplied with power from the utility as illus trated If utility power is interrupted the load is transferred to the generator When utility power re turns the load is retransferred to the utility The transfer and retransfer of the load are the two most basic functions of a transfer switch TRANSFER SWITCH FUNCTION Automatic transfer switches capa
61. ice Diagnosis of problems involves observing system operation If you cannot determine the problem contact Cummins Service AC power within the cabinet pres ents a shock hazard that can cause severe per sonal injury or death Whenever the cabinet door panel is removed use extreme caution to avoid touching electrical contacts with body tools jewelry clothes hair etc Several of the steps listed on the following pages clude checking on the control panel settings To check the control settings remove the transfer switch door panel unscrew the retaining screw swing the control mounting bracket to access the selector switch and slide the selector switch on the back on the control panel to the Configuration Mode position Power Outage Occurs But Generator Does Not Start AC power within the cabinet pres ents a shock hazard that can cause severe per sonal injury or death Whenever the cabinet door panel is removed use extreme caution to avoid touching electrical contacts with body tools jewelry clothes hair etc 1 Verify that the operation selector switch on the generator control panel is set to the Remote Auto position Check for fault indicators on the generator control Ignition of explosive battery gases can cause severe personal injury Do not smoke or cause any spark or flame while servicing batteries Ignition of fuel can cause se vere personal injury or death by fire or ex plosion Do not per
62. igure 4 5 Loosen and remove the two retaining clips and the control from the control mounting bracket Insert the new control in the mounting bracket Make sure the control gasket is installed be tween the control and the mounting bracket Use the two retaining clips to secure the control to the mounting bracket The clips are installed on the sides of the control see Figure 4 5 Reconnect the P3 P4 and P5 connectors to the control Make sure the P3 and P5 connec tors are in the correct slots see Figure 4 5 Reinstall the transfer switch cabinet door pa lel Restore power a Reconnect the generator starting battery negative lead first b If there is an external battery charger recon nect the battery charger to its AC power Source c Restore AC power to the automatic transfer switch d Move the operation selector switch on the generator to the Remote or Auto position 5 1310 CONTROL PANEL RETAINING CLIP FIGURE 4 5 CONTROL CONNECTORS BATTERY CHARGER REPLACEMENT PROCEDURE The transfer switch presents a shock hazard that can cause severe personal injury or death Before beginning installation remove all sources of AC power If a generator provides emergency power move the generator operation selector switch to Stop disconnect AC line power disconnect the battery charger from its AC power source and disconnect the starting battery negative lead first
63. ility utility power fails and the switch transfers to the Generator see Figure 2 3 1 While the transfer switch is connected to the utility utility power fails The Utility Connected LED remains lit but the Utility Power Available LED goes out 2 The time delay engine start TDES begins 3 When the TDES expires the internal start con tact closes P5 6 and P5 7 sending a start sig nal to the generator When the generator starts and produces pow er the Generator Power Available LED lights A time delay normal to emergency be gins After the TDNE timer expires the Open Normal P5 1 and Close Emergency P5 4 output is grounded energizing the K2 relay coil which closes the contacts K2 8 K2 12 K2 5 K2 9 to move the transfer switch from the Utility to the Generator The S2 auxiliary switch within the switch mechanism breaks the signal to the ATS operator coil C Limit switch ASW removes the ground signal from P4 7 signaling that the transfer switch has disconnected from Utility then the Utility Connected LED goes out and limit switch BSW provides a ground signal to P4 8 signaling that the transfer switch has connected to the gener ator then the Generator Connected LED lights de energizing the K2 relay by opening K2 8 K2 12 and K2 5 K2 9 The load is transferred to the generator HOIVH3N35 JHL OL ALNILN 5 1 SHf1990 ALMILN 40 5501
64. ion describes a typical transfer switch sequence of events and provides detailed troubleshooting procedures for experi UTILITY POWER AVAILABLE LED TEST PUSHBUTTON UTILITY CONNECTED LED OVERRIDE PUSHBUTTON GENERATOR SET EXERCISE enced service personnel The troubleshooting pro cedures use conditional schematics and symptoms to diagnose possible problems CONTROL PANEL LED INDICATORS The control panel contains six LED indicators that provide some information about the current control status and may be helpful in troubleshooting the transfer switch see Figure 2 1 Descriptions of these indicators are included in Table 2 1 GENERATOR POWER AVAILABLE LED GENERATOR CONNECTED LED EXERCISE LED PUSHBUTTON FIGURE 2 1 CONTROL PANEL TABLE 2 1 CONTROL PANEL LED INDICATORS demo Utility Power Available This indicator lights when the utility source voltage sensor has determined that Utility power is available and is within acceptable voltage limits Utility Connected 1 Lights constantly when the transfer switch is connected to the Utility 2 Blinks once per second when the transfer switch has failed to connect to or disconnect from the Utility when commanded 3 Is off when the transfer switch is not connected to the Utility Generator Power Available This indicator lights when the generator source voltage sensor has determined that generator power is within acceptable voltage and freque
65. le to contact a distributor using the automated service consult the Yellow Pages Typi cally our distributors are listed under Generators Electric Engines Gasoline or Engines Diesel or Recreational Vehicles Equipment Parts and Service If it is necessary to contact a distributor regarding the transfer switch always give the complete Model FIGURE 1 9 TRANSFER SWITCH WITH and Serial number This information is necessary to CONTROLLER properly identify your unit among the many types manufactured For models with a controller a model and se rial number label see Figure 1 8 is located on the back of the controller cover To view the label remove the screw securing the controller cover and open the cover see Fig ure 1 9 For models without a controller a model and serial number label is located on the inner panel To view the label remove the outer panel see Figure 1 10 Model No SCREWS TO Serial No BE REMOVED FIGURE 1 10 TRANSFER SWITCH WITHOUT FIGURE 1 8 MODEL AND SERIAL NUMBER LABEL CONTROLLER THIS PAGE LEFT INTENTIONALLY BLANK 1 6 2 Troubleshooting Transfer Switches With a Controller This section describes troubleshooting issues for installations that include a controller The first part of this section includes a description of the control LED indicators and provides preliminary troubleshooting checks for operators and service personnel The second part of this sect
66. lower left side see Figure 1 6 for the RSS100 transfer switch and Figure 1 7 for the 55200 transfer switch CUMMINS Model No 99100 08608 Modele serial No Current Rating 100 AMPS Voltage Rating 240 VAC IPH Poles 2 Frequency 60Hz Application Utility To Generator Enclosure Rating Type 3R Wiring Diagram 0630 3395 Interconnection Diagram 0630 3519 Outline Drawing 0500 4824 Suitable for use as service equipment UTILITY source only An additional disconnect must be readily avaiable for the alternate source unless the alternate source 15 an accessible generator and can be readily shut down Use Copper Or Aluminum Wire For Power Connections Use 60 C Rated Wire 14 To AWG Use 75 C Rated Wire 1 0 AWG And Larger Control circuit wiring must be installed in conduit Do not install in conduit with AC power wiring Suitable only for use with Cummins generator model GSAA This transfer switch is rated for use on a circuit capable of delivering not more than 10 000 rms symmetrical amperes 240 volts maximum Continuous load current to exceed 80 percent of switch rating FIGURE 1 6 RSS100 WITHOUT CONTROL DISPLAY NAMEPLATE ONE CIRCUIT BREAKER 1 4 CUMMINS ONAN Model No RSS200 6869 Modele Serial No serie Current Rating 200 AMPS Voltage Rating 240 VAC IPH Poles 2 Frequency 60Hz Application Utility To Generator Enclosure Rating Type 3R Wiring
67. ming any test or replacing any components Transfer Switch Operation When troubleshooting the RSS transfer switch it is important to remember the following he generator control uses limit switches ASW and BSW on either side of the transfer switch to determine if the switch has opened or closed If either the ASW or BSW limit switches are bad the generator control displays a trans fer switch signal failure his is a two position transfer switch It can be connected only to either one source There is no neutral position he control supplies a signal to energize the relay coil K1 All inputs are activated by applying a ground to the signal input The software includes a retry function If the transfer switch fails to transfer within one sec ond power is removed and the software waits ten seconds before trying again After three times the software quits trying Troubleshooting For information on the controller indicator fault sig nals refer to the GSAA generator Service Manual Table 3 1 lists troubleshooting issues for transfer switches without a controller ALNILN JHL OL HOLVH3N39 JHL H33SNVH I SNYNLIY ALMILN 6 6 38n9l3 200 01 SNOI123NNO2 0801 N 81 Y7 LUS 9698 0689 ON 13417 ONIQNOG NIV N 114415 ON 11111110 VN 98 AILITLO 182 114405 uo1vu3N39 83 V3 ADVd 3as ALMILN
68. mit any flame cigarette spark pilot light arcing equipment or oth er possible source of ignition near the fuel system 2 Start the generator using its start stop Run Off controls If it does not crank check the starting batteries If it cranks but does not start check the fuel supply 3 Check the controller for the transfer switch start signal to the generator The start signal relay remains closed while sending the signal to the generator The start signal relay can be mea sured with a voltmeter at either P5 6 and P5 7 or at TB2 2 and TB2 4 If the start signal relay contact is open reset the DC power of the con troller by disconnecting the battery Generator Starts During Normal Power Service AC power within the cabinet pres ents a shock hazard that can cause severe per sonal injury or death Whenever the cabinet panel is removed use extreme caution to avoid touching electrical contacts with body tools jewelry clothes hair etc 1 Verify that the operation selector switch on the generator control panel is set to the Remote Auto position 2 Check the Utility Power Available LED on the control panel to see if it is lit If the Utility Power Available LED is lit a Check the Active Exercise LED to see if it is in an exercise period If the Active Exercise LED is flashing an exercise is enabled the Active Exercise LED is Off no exercise period is set b Momentary voltage dips might cause vol
69. nal battery charger dis connect the battery charger from its AC power source Ignition of explosive battery gases can cause severe personal injury Do not smoke or cause any spark arc or flame while servicing batteries Accidental starting of the gen erator can cause severe personal injury or death due to electrocution or contact with moving parts Disconnect the starting bat tery cables before performing service Bat teries emit hydrogen a highly explosive gas Thoroughly ventilate the battery compartment before removing battery cables Remove the negative cable 5 first to reduce the risk of arcing c Disconnect the generator starting battery negative lead first If the cabinet must be opened for any reason remove AC power to the au tomatic transfer switch If the instructions require otherwise use extreme caution due to the danger of shock hazard d Remove AC power to the automatic transfer switch Remove the transfer switch cabinet door panel Unplug the four connectors which connect to the transformer Take note of how the trans former is installed Remove the two M3 nuts securing the trans former to the side of the cabinet Remove the transformer Use the nuts removed in step 4 to install the new transformer with the same orientation as the old one Plug the four connectors which connect to the transformer Restore power a the generator
70. ncy limits Generator Connected 1 Lights constantly when the transfer switch is connected to the Generator 2 Blinks once per second when the transfer switch has failed to connect to or disconnect from the Generator when commanded 3 15 off when the transfer switch is not connected to the Generator Exercise The following describes the Exercise LED when an exercise is enabled Lights constantly when repeat exercise periods have been set Blinks twice per second when the Set Exercise button is pressed and held to set or cancel an exercise period Blinks once per second when an exercise period is active 4 s off when no repeat exercise periods are set This indicator blinks at two times per second rate during the two seconds that the Test button is pressed to acknowledge that a test has been activated or when the remote test input is grounded The indicator lights constantly during the test and goes out once the test is termi nated or normal power has failed The indicator blinks at two times per second rate during the two seconds to ac knowledge that the Test button has been pressed to cancel a Test The light then goes out 2 2 CONTROL PANEL FUNCTIONS THAT SHOULD NOT BE ADJUSTED The control used with the RSS transfer switch is also used on other models that have additional fea tures Although Table 2 2 shows the complete list of functions that can be adjusted through the control panel please note that several
71. nger of shock hazard d Remove AC power to the automatic transfer switch Remove the transfer switch cabinet door panel Mark and disconnect all wires connected to the limit switches see Figure 4 3 Remove the faulty limit switch Install the new limit switches Use the manual operation handle see Figure 4 4 to rotate the shaft so that the limit switches are installed as shown in Figure 4 3 Restore power a Reconnect the generator starting battery negative lead first b If there is an external battery charger recon nect the battery charger to its AC power source c Restore AC power to the automatic transfer switch d Move the operation selector switch on the generator to the Remote or Auto position TRANSMISSION D TRANSFER SWITCH MANUAL SWITCH POSITION INDICATORS OPERATION HANDLE RED ON or GREEN OFF FIGURE 4 4 MANUAL OPERATION HANDLE CONTROL REPLACEMENT PROCEDURE This procedure is only for RSS transfer switches that include a controller The transfer switch presents a shock hazard that can cause severe personal injury or death Before beginning installation remove all sources of AC power If a generator provides emergency power move the generator operation selector switch to Stop disconnect AC line power disconnect the battery charger from its AC power source and disconnect the starting battery negative lead first 1 Remove all sources of power f
72. on The TDEL can be set up to 300 seconds Change the TDEL to 0 sec onds FUNCTION CODE VALUE VALUE Default in FOR TDNE CODE bold italics 0 Seconds Disabled e ism 00 Of Sens Oe e Of 5Seonds c e _ 1056 _ 300 Seconds FUNCTION CODE VALUE VALUE Default in FOR TDEL CODE bold italics 0 Seconds Disabled 550 e iS Oe O sens Oe e o o son c e Sons _ 1208 300 Seconds b There may be an active transfer inhibit transfer inhibit is enabled the load transfer will not take place until the Override push button on the control panel is pressed or the transfer inhibit input is disabled NOTE transfer inhibit is present the trans fer switch is miswired This feature is not to be used with the RSS transfer switch On the controller the transfer inhibit P4 5 and retransfer inhibit P4 6 should not be wired c Although it is not offered with this transfer switch a phase check may be enabled When the phase check function is enabled the generator does not assume the load un til both sources are within acceptable limits of the phase check sensor Battery Charger Fails To Charge 1 Check the battery charger LED light a If the LED is red the charger is still charging b If the LED is green but the battery has not charged the battery is defective and ne
73. or operation selector switch to Stop disconnect AC line power disconnect the battery charger from its AC power source and disconnect the starting battery negative lead first 1 Remove all sources of power from the transfer switch in the following order a Move the operation selector switch on the generator to Stop Off Always disconnect a battery charger from its AC source before discon necting the battery cables Otherwise dis connecting the cables can result in voltage spikes high enough to damage the DC con trol circuits b If there is an external battery charger dis connect the battery charger from its AC power source Ignition of explosive battery gases can cause severe personal injury Do not smoke or cause any spark arc or flame while servicing batteries Accidental starting of the gen erator can cause severe personal injury or death due to electrocution or contact with moving parts Disconnect the starting bat tery cables before performing service Bat teries emit hydrogen a highly explosive gas Thoroughly ventilate the battery compartment before removing battery cables Remove the negative cable 5 first to reduce the risk of arcing c Disconnect the generator starting battery negative lead first If the cabinet must be opened for any reason remove AC power to the au tomatic transfer switch If the instructions 5 require otherwise use extreme caution due to the da
74. r a typi cal transfer switch with options Always refer to the schematic and wiring diagram package that was shipped with the transfer switch for specific informa tion about its configuration Make a thorough inspection of the transfer switch wiring to make sure that good wire harness and ground connections are made Correct wiring prob lems before performing any test or replacing any components Transfer Switch Operation When troubleshooting the RSS transfer switch it is important to remember the following The control uses limit switches ASW and BSW on either side of the switch to determine if the switch has opened or closed If the ASW limit switch is bad after the load is transferred to the Utility and the Utility Connected LED is not lit after five attempts the Utility Connected LED will flash If the BSW limit switch is bad af ter the load is transferred to the generator and the Generator Connected LED is not lit after 2 19 five attempts the Generator Connected LED will flash This is a two position transfer switch It can be connected only to one source There is no neu tral position The control supplies a grounding signal to pick up the control relays K1 and K2 All inputs are activated by applying a ground to the signal input The control operates over a DC voltage range of 8 to 35 volts but the 12V control relays are used with the RSS transfer switch because of the generator start battery I
75. r transfer switches with a controller remove the transfer switch cabinet door panel For transfer switches without a controller remove the outer and inner door panels Remove all control and power wiring from the switch terminals Loosen the six 1 4 20 bolts item 1 in Figure 4 1 or 4 2 securing the mechanical lugs For transfer switches with a controller or with one circuit breaker loosen and remove the two Screws nuts and washers items 2 in Figure 4 1 or 4 2 securing the bracket at the load and emergency side bottom of the switch Loosen and remove all M6 nuts and lock wash ers item 3 in Figure 4 1 or 4 2 securing the switch to the rear wall of the cabinet Remove the switch and bottom bracket from the cabinet Mark the bus bar of each phase of the Utility Generator and Load Then remove all of the bus bars from the old switch Install the bus bars on the new switch in accor dance to the markings Use the hardware removed in step 6 to install the new switch in the cabinet Torque the M6 nuts to 35 in lbs 4 Nem and torque the 1 2 20 screws to 80 in Ibs 9 Nem For transfer switches with a controller or with one circuit breaker use the hardware removed in step 5 to install the bracket at the Load and Emergency side of the switch Torque the M6 nuts to 35 in lbs 4 Nem 12 Tighten the 1 4 20 bolts securing the me chanical lugs Torque the bolts to 80 in lbs 9 Nem 1
76. rom the transfer switch in the following order a Move the operation selector switch on the generator to Stop Off Always disconnect a battery charger from its AC source before discon necting the battery cables Otherwise dis connecting the cables can result in voltage spikes high enough to damage the DC con trol circuits b If there is an external battery charger dis connect the battery charger from its AC power source Ignition of explosive battery gases can cause severe personal injury Do not smoke or cause any spark arc or flame while servicing batteries Accidental starting of the gen erator can cause severe personal injury or death due to electrocution or contact with moving parts Disconnect the starting bat tery cables before performing service Bat teries emit hydrogen a highly explosive gas Thoroughly ventilate the battery compartment before removing battery cables Remove the negative cable s first to reduce the risk of arcing c Disconnect the generator starting battery negative lead first If the cabinet must be opened for any reason remove AC power to the au tomatic transfer switch If the instructions require otherwise use extreme caution due to the danger of shock hazard RETAINING CLIP d Remove AC power to the automatic transfer switch Remove the transfer switch cabinet door panel Unplug the P3 P4 and P5 connectors from the back of the control see F
77. ry charger Disconnect the two wires connecting the bat tery charger to TB2 transfer switches with a controller or TB 4 transfer switches without a controller Loosen and remove the hardware securing the battery charger mounting brackets Remove the brackets and the charger Use the hardware remove in step 5 to secure the mounting brackets and new changer to the inside of the transfer switch cabinet see Figure 4 1 Reconnect the two wires connecting either TB2 4 to the battery charger Reconnect the AC power cord to the battery charger Reinstall the transfer switch cabinet door panel Restore power a Reconnect the generator starting battery negative lead first b If there is an external battery charger recon nect the battery charger to its AC power source c Restore AC power to the automatic transfer switch d Move the operation selector switch on the generator to the Remote or Auto position AC POWER CORD FIGURE 4 6 BATTERY CHARGER CONTROL RELAY REPLACEMENT PROCEDURE NOTE Transfer switches with a controller include two control relays K1 and K2 Transfer switches without a controller include only one control relay K1 The transfer switch presents a shock hazard that can cause severe personal injury or death Before beginning installation remove all sources of AC power If a generator provides emergency power move the generator operation
78. son 1 Move the operation selector switch on the gen erator set to Stop 2 Disconnect the battery charger 3 Disconnect the starting batteries of the genera tor set or sets remove the ground lead first 4 Remove AC power to the automatic transfer switch If the instructions require otherwise use extreme caution due to the danger of shock hazard GENERAL PRECAUTIONS Place rubber insulative mats on dry wood platforms over metal or concrete floors when working on any electrical equipment Do not wear damp clothing particularly wet shoes or allow skin surfaces to be damp when handling any electrical equipment Jewelry is a good conductor of electricity and should be removed when working on the electrical equipment Wear safety glasses whenever servicing the trans fer switch and and do not smoke near the batteries Do not work on this equipment when mentally or physically fatigued or after consuming alcohol or any drug that makes the operation of equipment un safe A WARNING INCORRECT SERVICE OR REPLACEMENT OF PARTS CAN RESULT IN DEATH SEVERE PERSONAL INJURY AND OR EQUIPMENT DAMAGE SER VICE PERSONNEL MUST BE QUALIFIED TO PERFORM ELECTRICAL AND OR MECHANICAL SERVICE OTEC 1 THIS PAGE LEFT INTENTIONALLY BLANK 1 Introduction ABOUT THIS MANUAL Section 3 provides information on how to troubleshoot transfer switches that include a This manual contains service procedures for RSS circuit breaker
79. t age sensors to initiate generator starting Check the utility undervoltage parameter settings on the control panel Increase the TDES setting If the Utility Power Available LED is not lit a Check the control setting to verify that the system nominal voltage matches what is listed on the nameplate b Check the control setting to verify that the system frequency matches what is listed on the nameplate c Check the control setting to verify that the system phase setting matches what is listed on the nameplate d Check the control setting to verify that the utility undervoltage dropout point is set low er than the pickup set point Generator Does Not Exercise AC power within the cabinet pres ents a shock hazard that can cause severe per sonal injury or death Whenever the cabinet panel is removed use extreme caution to avoid touching electrical contacts with body tools jewelry clothes hair etc 1 Verify that the operation selector switch on the generator control panel is set to the Remote Auto position 2 Check the Exercise LED on the control panel to see if it is lit a If the Exercise LED is not lit no exercise pe riod has been set Refer to the exerciser programming procedure for information on setting an exercise b If the Exercise LED is lit but not flashing the exercise period has not yet started The start and stop times are not displayed 3 Start the generator using its start stop R
80. terminals Voltage must be higher than the generator voltage sensor pickup point Check the power circuit wiring between the transfer switch and the generator Wait until the time delay up to 300 seconds has expired or press the Override pushbut ton on the control panel or ground the Over ride input Check for ground on P4 5 If present remove the wire or press the Override pushbutton TABLE 2 6 GENERATOR IS RUNNING BUT THE TRANSFER SWITCH DID NOT TRANSFER TO THE GENERATOR AC power within the cabinet presents a shock hazard that can cause severe personal injury or death Use extreme caution to avoid touching electrical contacts with body tools jewelry hair clothes etc Prior to working with live circuits remove all sources of AC power The following procedures are to be performed only by technically trained and experienced personnel Improper operation of the generator presents a hazard that can cause severe personal injury or death Observe all safety precautions in your generator manuals Indicator Possible Cause Corrective Action Utility Con nected LED is flashing The control was unsuccessful in its attempts to open the Utility side of the transfer switch Af ter 5 attempts to move the transfer switch the Utility Connected LED flashes indicating that it failed to open To close to the generator the control grounds P5 1 P5 4 to energize K2 for 1 second and monitors the Utility
81. ts with body tools jewelry hair clothes etc Prior to working with live circuits remove all sources of AC power The following procedures are to be performed only by technically trained and experienced personnel Improper operation of the generator presents a hazard that can cause severe personal injury or death Observe all safety precautions in your generator manuals Indicator Possible Cause Corrective Action Generator 1 There may be improper voltage at the volt 1a Check for proper generator voltage between Available LED is off Generator Available LED is on age sensor inputs There may be improper voltage between the transfer switch power termi nals There may be improper voltage at the generator output terminals A time delay normal to emergency TDNE may be timing There may be an active transfer inhibit resulting from a connected ground on P4 5 The transfer inhibit feature is not of fered with the RSS transfer switch 2 21 1 and 3 of the controller connector The voltage must be higher than the genera tor voltage sensor pickup point Check voltage sensing wiring between the control and the transfer switch Check for proper generator voltage between transfer switch power terminals EA and EB line to line or between EA and EN line to neutral Voltage must be higher than the generator voltage sensor pickup point Check for proper voltage at generator output
82. un Off controls If it does not crank check the starting batteries If it cranks but does not start check the fuel supply Check the controller for the transfer switch start signal to the generator The start signal relay remains closed while sending the signal to the generator The start signal relay can be mea sured with a voltmeter at either P5 6 and P5 7 or at TB2 2 and TB2 4 If the start signal relay contact is open reset the DC power of the con troller by disconnecting the battery Ignition of explosive battery gases can cause severe personal injury Do not smoke or cause any spark or flame while servicing batteries Ignition of fuel can cause se vere personal injury or death by fire or ex plosion Do not permit any flame cigarette spark pilot light arcing switch or equip ment or other possible source of ignition near the fuel system After a Power Failure the Generator Starts But Does Not Assume the Load AC power within the cabinet pres ents a shock hazard that can cause severe per sonal injury or death Whenever the cabinet panel is removed use extreme caution to avoid touching electrical contacts with body tools jewelry clothes hair etc 1 Check to see if the Generator Power Available LED on the control panel is lit If the Generator Power Available LED is not lit a Check the output voltage of the power source either on the generator side cable lugs of the transfer switch or t
83. y or death Use extreme caution to avoid touching electrical contacts with body tools jewelry hair clothes etc Prior to working with live circuits remove all sources of AC power The following procedures are to be performed only by technically trained and experienced personnel Improper operation of the generator presents a hazard that can cause severe personal injury or death Observe all safety precautions in your generator manuals Possible Cause Corrective Action The transfer switch failed to transfer to the utility Transfer switch signal failure 1 The Utility source may not be pres ent The step down transformer is faulty 240 VAC to 18 VAC used to de tect if utility voltage is present The K1 relay coil may not have re ceived a 12 VDC signal K1 relay may malfunction There may be a defective wire The switch mechanism solenoid may be burnt out There may be loose or broken parts within the switch mechanism No feedback to indicate switch posi tion either on Utility or Generator side The ASW or BSW limit switch may be faulty 1a Check to see that the Utility service disconnect circuit breaker is in the position 1b Check for a transformer signal be tween 4 1 and 4 2 The output reading should be 18 VAC 3 Replace the transformer Check for a relay coil signal 12 VDO between TB4 3 and 4 4 Verify the r

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