Figure 8-11. Overload Relay Test Set-Up

Figure 8-10. Reverse Power Relay Test Set-Up

Figure 8-12. Underfrequency Relay Test Set-Up

TM-5-6115-545-34 Generator Set Diesel Engine Driven Tactical Skid Mtd. 30 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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REF DES DESCRIPTION DS1 , DS2 R1, R2, R3 S1 Tl, T2, T3 Figure 8-11. Overload (a) Connect an external switch across terminals and 8. Close switch. (b) Adjust the frequency to 50 Hz and the input voltage to 120 volts. Relay contacts should pick up; lamp DSl should light and DS2 should ex- tinguish. (c) Lower frequency slowly until relay con- tacts drop out (lights transfer). Contacts should drop out at 46 + 1 Hz. — (d) Raise frequency slowly until contacts pick up (DS1 should light and DS2 should extinguish). Contacts should pick up at 45 to 49 Hz. (e) Raise voltage to 132 volts and check for drop out lights transfer). Drop out should occur within + 1 Hz of drop out at 120 volts. (f) Lower voltage to 108 volts. Drop out (lights transfer) should occur within ± 1 Hz of drop out at 120 volts. INDICATOR LIGHT RESISTOR, FIXED SWITCH, DC POWER 3 PHASE VARIAC ME 6115-545-34/8-11 C1 Relay Test Set-Up (g) Open switch between terminals 7 and 8, and adjust input frequency to 60 Hz. Repeat steps (b) through (f). Drop out should occur at 55 ± 1 Hz; pick up at 58 + 1 Hz. (3) To test the undervoltage relay, see figure 8-13 and refer to paragraph 8-7c (4), but adjust frequency for 50/60 Hz operation. (4) To test the permissive parallel relay, perform the procedure in paragraph 8-7c (6), but adjust frequency for 50/60 Hz operation. (4a) To test the resistor assembly (A6), refer to figure 1-7 and proceed as follows: (a) Check the resistance of R4 between points 1 and 2 on terminal board TB1 06. Resistance should be 250 ohms. (b) Check the resistance of R5 between points 3 and 4 on terminal board TB106. Resistance should be 250 ohms. Change 1 8-17

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