MAINTENANCE OF WIRING HARNESSES

TM-9-6115-604-12 Generator Set Diesel Engine Driven Tactical Skid Rtd. 60 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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ARMY TM 9-6115-604-12 NAVY NAVFAC P-8-633-12 (3) Reactive Gable Assembly. This cable assembly is used to interconnect the generator set to another generator set for isochronous paralleling. The two element cable interconnects generator set paralleling current transformers CT114 and voltage regulators VR101. The cables are 100 feet (30 meters) long and connect to the REACTIVE LOAD receptacles J21, J22, or J23 (3, figure 2-17) on the right side of the generator set. (4) Governor Circuit Cable Assembly. This cable is used to interconnect generator set governor control circuits for isochronous paralleling. The two element shielded cable interconnects generator set load sharing panels A104. The cable is 100 feet (30 meters) long and connects to GOVERNOR CONT receptaclesJ18, J19, orJ20 (Figure 2-17) on the right she of the generator set. (5) Station Power Cable Assembly. The station power (utility power) cable assembly is used to connect the generator set to an external single phase, 240 V ac power, or 380 V ac power source. The 100 foot (30 meter) cable is connected to UTILITY POWER receptacle J101 (Figure 1-4) on the right side at the generator set to bring in power to connection board assembly TB103. TB103 is set to connect the power to generator set 120 V ac circuits directly, or through utility station power transformer T103, depending on whether the utility power is 240 V ac or 380 V ac, respectively. Cable ends at the opposite end of the station power cable assembly allow for connection to three chase or single phase power. 4-35. MAINTENANCE OF WIRING HARNESSES. Wiring harnesses are used for electrical connections, in the generator set. To avoid death or injury to personnel, no electrical component will be worked on while energized. Verify that the load cables are disconnected and "parked" and that MAIN DISCONNECT switch S120 is set to OPEN. Ensure equipment is 'tagged out" in accordance with Chapter 1, Section III, of this manual and equipment is NOT energized. Residual voltage is present at the generator leads with regulator turned off, reaching SEVERAL HUNDRED VOLTS on the generator set. Proper Insulation and isolation of metering equipment must be observed when testing this generator. USE PROPER TEST EQUIPMENT TO CHECK FOR VOLTAGE before proceeding with work. a. Remove. (1) Remove all hangers, clamps, and ties attaching the harness to be replaced on the generator set. (2) Tag and disconnect all wires terminating In lugs from their mountings by removing nuts and washers attached to their lugs (3) Where wires are soldered to a connector, the connector is considered part of the harness and is replaced with the harness. Remove screws, nuts, and washers, as necessary, to remove multiple connectors. (4) Remove harness from generator set by withdrawing wires past any obstruction until wires are free of the generator set b. Test. (1) Note carefully any malfunction of the generator set traceable to components that are electrically connected to the harness being tested. (2) Where there is indication that a given harness is causing a malfunction, test the wires relating to the malfunctioning circuit both for continuity and internal shorts. Check all suspect wires for continuity to grocers. See to the applicable wiring diagram FO-4 through FO-12. 4-95

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