SHAFT-REAR 5511120 - Caterpillar

If all the above checks pass there is no problem with the current sense part of the scaling network.6.22.2.3: Test 3-Check The Wiring To The Governor Mounting PanelLocomotives Without Dynamic Brakes Check continuity between TB399-R10 and TB391-L10.Check continuity between TB399-R9 and TB391-L9.Check continuity of the jumper between TB399-R4 and TB399-R8If any connections are not 0 ohms, refer to the locomotive schematics to troubleshoot the locomotive wiring.Locomotives With Dynamic Brakes Check continuity between TB399-R10 and TB391-L10.Check continuity between TB399-R9 and TB391-L9.Check the dynamic brake interlock relay that connects TB399-R4 and TB399-R8.If any connections are not 0 ohms, refer to the locomotive schematics to troubleshoot the locomotive wiring.6.22.2.4: Test 4-Check Governor Mounting PanelRemove the locomotive system wire to TB391-L10.Measure the impedance between TB391-L10 and TB391-L9. If this is 64K ohms 10 percent, there is not a problem with the locomotive governor panel. If this is not 64K ohms 10 percent, there is a problem with the locomotive governor panel, proceed to "6.22.2.5: Test 5-Troubleshooting Governor Mounting Panel".6.22.2.5: Test 5-Troubleshooting Governor Mounting PanelDisconnect the J1 connector from the main electronic governor box and measure the continuity between TB391-L10 to J1/10 and between TB391-L9 to J1/9.If one or both of these connections has no continuity, refer to "4.12: Installation Diagrams (diagram 22)" to troubleshoot the panel wiring.Check the impedance between TB391-L10 and TB391-L9. It should be an open circuit (> 2M ohms). If it is not an open circuit refer to "4.12: Installation Diagrams (diagram 22)" to troubleshoot the panel wiring.If the above two checks show the panel wiring to be defective, replace the main electronic governor box according to "8.2: Main Governor Box".6.23: Incorrect Scaling Of Motor Current Sense
Probable Cause
* Incorrect Transductor Excitation* Defective Transductor* Defective Input Module* Defective Wheelslip ModuleIntroduction
This troubleshooting procedure essentially interprets the results obtained from performing the procedures outlined in "8.20: Motor Current Sense Scale Factor". The procedure assumes that the procedures outlined have already been performed and an incorrect scale factor has been confirmed.Check For Correct Transductor Excitation
With reference to "4.12: Installation Diagrams (diagrams 11 thru 15)" and the locomotive prints check the excitation voltage to the transductors with the engine running in each notch.Refer to the appropriate service information from the auxiliary generator manufacturers to determine normal operation.Transductor Check
Perform the procedure outlined in "8.20.3: Transductor Check".If OK proceed to "6.23.5: Input Module Check".If not OK, check the wiring to the apparently defective transductor and repair if necessary. If the wiring is OK replace defective transductor.Input Module Check
Perform the procedure outlined in "8.20.4: Input Module Test".If OK proceed to "6.23.6: Wheelslip Module Check".If not OK, check the wiring to the apparently defective input module and repair if necessary. If the wiring is OK replace defective input module according to "8.13: Wheelslip Module".Wheelslip Module Check
Perform the procedure outlined in "8.20.5: Wheelslip Module Current Scaling Check".If OK there has been an error in conducting the procedures up to this point. Start back at the beginning of "6.23: Incorrect Scaling Of Motor Current Sense".If not OK, replace