GOVERNOR CONTROL UNIT

Figure 4-43. DC Circuit Breaker, Removal and Installation

TM-9-6115-464-12 Wrench Impact Hydraulic Model MV-12-140T Manual
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ARMY TM 9-6115-464-12 AIR FORCE TO 35C2-3-445-1 NAVY NAVFAC P-8-624-12 4-68 GOVERNOR CONTROL UNIT (Precise Sets Only). Inspect governor control unit for cracks, dents, inse- cure connectors, insecure mounting, and evidence of shorting or other damage. 4-69 INTERCONNECTIN G WIRING HARNSSES. a. Removal. Remove wiring harness terminals, wires, and connectors as required for access to other components and to replace damaged parts. b. Cleaning and Inspection. (1) Clean wiring harness with filtered compressed air and an electrician’s brush or wipe with a clean, lint-free cloth lightly moistened with an approved solvent. (2) Visually inspect connector for corrosion, cracks, and bent or broken pins. (3) Check electrical leads for burned, bent, corroded, or missing terminals. (4) Check insulation for burns, chafing, and deterioration. c. Testing. Test continuity of individual wires with a multimeter using figures FO-1 and FO-2. Do not use acid core solder on electrical wiring. Equipment damage could result if caution is not observed. d. Repair. Replace wires, terminals, and connectors by unsoldering connections, installing replacement parts and soldering connections. NOTE If more than 30 percent of the wires are damaged, replace the wiring harness and forward it to higher level maintenance for rebuilding. e. Installation. Install connectors, wires, wiring harness terminals after damaged parts are replaced. Section XV. UNIT MAINTENANCE OF THE GENERATOR ELECTRICAL SYSTEM 4-70 GENERAL. The generator set shall be shut down prior to performing maintenance on the generator electrical system. Serious injury or death by electrocution may result from failure to observe this warning. a. One lead of each of the two coils of each generator phase (15 KW, 50/60 Hz Precise and Utility Sets) is connected directly to the voltage reconnection board. The remaining two leads of each phase make two passes through the windows of a three-window current transformer which serves as a current pickup for generator exciter voltage regulation. A second three-window current transformer serves as a sensor for control cubicle instruments. The leads make four passes through the windows of this transformer. Two leads of one of the phases makes two passes through a single-window crosscurrent transformer which senses current for reactive power measurement. Local voltage sensing and adjustment are accomplished across a single coil of the remaining phase. (See FO-1.) NOTE On 15 KW, 400 Hz Precise Sets, two leads of one of the phases, instead of being connected directly to the voltage reconnection board, are routed to pass through the window of the cross-current transformer. b. The voltage reconnection board consists of a stationary terminal board and a movable Iink-type board. This arrangement provides a means of connecting the two coils of each phase in series or parallel to provide 120/208 or 240/416 Vac generator output. Simultaneously, the voltage reconnection board provides reconnection of any other circuits necessary to convert the generator set from 120/208 Vac to 240/416 Vac operation. 4-107

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