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

Figure 15-10. Under/Over Voltage 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 Figure 15-11. Underfrequency and Overfrequency-Relay, Test Setup (5) Decrease frequency generator frequency to 58. 2 Hz. With ohmmeter connected between terminals 5 and 6, relay should trip at 58. 2 Hz (57. 7 to 58. 7 Hz), at which time ohmmeter will no longer show continuity. (6) Turn adjustment screw clockwise to raise trip point. b. Replacement. The underfrequency relay (10, figure 15-9) is removed and replaced a follows: (1) Disconnect and tag wires connected to the underfrequency terminal board. (2) Remove four screws and washers. Remove device (10) from panel (7). (3) Replace underfrequency relay (10) by attaching to panel (7) with four screws and washers. Connect wires and remove tags. 15-18. OVERFREQUENCY RELAY. The overfrequency relay (9,. figure 15-9) is adjustable within the range specified in the tabulated data in Chapter 1 of the Operator and Organizational Maintenance manual. Trip setting is adjusted with the adjustment screw on the device. Test the device as follows: a. Test. (1) Connect overfrequency relay as shown in figure 15-11. (2) Adjust variable frequency generator for 50. 0 Hz output. Close switch SI. (3) With ohmmeter connected between terminals 5 and 7, adjust frequency generator to 51. 5 Hz (51 to 52). At this point, relay should trip. Ohmmeter will no longer show continuity. 15-16

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