Figure 5-21. Over/under Voltage Device, Test Setup

Figure 5-20. Under and Overfrequency Devices, 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 (d) Open switch S1. Adjust frequency generator for 60 Hz output. (e) 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. (f) Turn adjustment screw clockwise to raise trip point. (2) REPLACEMENT. Remove relay (9, figure 5- 19) by disconnecting and tagging wires and removing four screws (1). b. Overfrequency relay 81GO (8, figure 5-19). (1) Test the overfrequency relay by connecting as shown in figure 5-20. (a) Close switch S1. (b) Adjust variable frequency generator for 50.0 Hz output. (c) 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. (d) Open switch S1. (e) 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 should indicate infinite ohms. (f) Turn adjustment screw clockwise to raise trip point. (2) REPLACEMENT. Remove relay (8, figure 5- 19) by disconnecting and tagging wires and removing four screws (1). c. Over/under voltage relay 27/59G (7, figure 5- 19). Figure 5-21. Over/under Voltage Device, Test Setup 5-26

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