MAINTENANCE OF STARTER SLAVE RELAYS K1/K2

MAINTENANCE OF CRANK CYCLE TIMER M7 AND CRANK RELAY K3

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 c. Install. See Figure 4-26. (1) Install battery charger BC1 (5) and drip shield cover (4) over the upper vibration isolators (1), and secure with the upper hexagonal nuts (2) and lock washers (3). Install the hexagonal nuts (2), lock washers (3), and vibration isolators (1) at the base of the battery charger BC1. (2) Connect wiring as tagged in step b, above Discard tags. (3) Test new battery charger BC1 in accordance with step a, above. d. Adjust. See Figure 4-26. To adjust the battery charger BC1 float and equalizer output voltages proceed as follows: (1) Connect the negative lead of the dc voltmeter to the red slider band. Connect the positive lead to the red wires on the bottom of the resistor which is positioned vertically on the right side wall of the battery charger housing. Turn equalizer timer to the OFF position. Adjust the red slider band for a 4 V dc reading on the voltmeter. Moving the red slider band toward the green slide band will raise the taper and shutdown point. (2) Connect the negative lead of the dc voltmeter to the black wires on the top of the resistor and the positive lead to the green slider band. Turn the equalizer timer to the ON position. Adjust the green slider band until the voltmeter reads 24.5 V dc. Voltage readings across the black wires and the green slider band should be approximately 23 V dc with equalizer timer off and 24.5 V dc with the equalizer timer on. 4-21. MAINTENANCE OF STARTER SLAVE RELAYS K1/K2 . See Figure 3-3 Starter relays K1/K2 are located near the starter motors on the right side of the engine. They are used as slave relays to energize starter solenoids energize starter L3 and L4 which motors B1 and B2. To avoid death or injury to personnel, no electrical component will be worked on while energized. 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 the 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. Test. (1) Perform a functional test of the relays K1/K2 by operating the generator set. If the operational test indicates that the relays are bad, remove the relays and bench test as follows. (a) Using a power supply, apply 24 V to the coil (b) Using a multimeter set to RX1 scale, test for continuity of the contactors with 24 V applied When contactors close, multimeter should read zero. (c) Remove test equipment. Replace defective starter relays in accordance with steps b and c, below: b Remove. See Figure 3-3. (1) Disconnect battery power. (2) Tag and disconnect wiring from defective component. (3) Remove relays K1/K2 by removing screws, lock washers, and nuts. c. Replace. See Figure 3-3. (1) Install serviceable relays K1/K2 and secure with screws, lock washers, and nuts. (2) Connect wiring and perform a functional test Discard tags. (3) Reconnect battery cables. 4-74

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