Replacement - TM-5-6115-593-34

Figure 15-11. Underfrequency and Overfrequency-Relay, Test Setup

TM-5-6115-593-34 Generator Set Diesel Engine Driven Tactical Skid Mtd. 600 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 (4) Open switch S1. (5) Set frequency generator output to 60. 0 Hz and connect ohmmeter between terminals 5 and 6; ohmmeter should indicate continuity. Increase frequency generator output to 61. 8 Hz; relay should trip at 61. 8 Hz (61. 3 to 62. 3) and ohmmeter indicate infinite ohms. (6) Turn adjustment screw clockwise to raise trip point. b. Replacement. The overfrequency relay (9) is removed and replaced as follows: (1) Disconnect and tag wires connected to the overfrequency terminal board. (2) Remove four screws and washers. Remove device from panel (7). (3) Replace relay (9) by attaching to panel (7) with four screws and washers. Connect wires and remove tags. 15-19. TIME DELAY RELAY. The time delay relay (19, figure 15-9) is a "delay on drop-out" type relay, set for 1. 5-15 seconds delay. The relay is adjustable within the range specified in the tabulated data in Chapter 1 of the Operator and Organizational Maintenance manual. Timing is adjusted with the calibrated dial on the relay. Test and replace relay as follows: a. Test. (1) Connect the time delay relay as shown in figure 15-12. (2) Momentarily close switch S1. Lamp DS1 will light and remain lit for 1. 5-15 seconds. (3) Turn calibrated dial clockwise to increase timing. b. Replacement. Remove and replace time delay relay (19) as follows: (1) Disconnect and tag wires connected to the time delay relay. (2) Remove four screws and washers. Remove relay from panel (7). (3) Replace relay (19) by attaching to panel (7) with four screws and washers. Connect wires and remove tags. 15-20. RELAYS (BR1-BR4, MR1-MR4, RR). BR1-BR4, MR1-MR4 (14, figure 15-9) and RR (20) relays are mounted on panel (7). a. Test. (1) Connect a 120V AC power source to relay coil as shown in figure 15-13. (2) Check that normally open contacts close and normally closed contacts open relay coil is energized, by verifying ohmmeter indication of 'zero' with contacts closed and 'infinity' with contacts open. b. Replacement. Relays (14 and 20, figure 15-9) are removed and replaced as follows: (1) Disconnect and tag wires connected to relays. (2) Remove two screws and two washers for each relay, remove relay from panel (7). (3) Replace relay (14 or 20) by attaching the panel (7) with two screws and washers. Connect wires and remove tags. 15-21. RELAYS (LR1-LR4, LRTD1-LRTD4). Relays LR1- LR4 (15, figure 15-9) and LRTD1-LRTD4 (13) are mounted on relay panel (7). a. Test. (1) Connect a 24V DC power supply across coil of relay as shown in figure 15-14. (2) Check that normally open contacts close and normally closed contacts open 15-17

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