Figure 8-13. Undervoltage Relay Test Set-Up

Figure 8-12. Underfrequency Relay Test Set-Up

Figure 8-13A. DC Relay Assembly (A5) Test Setup

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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ME 6115-545-34/8-13 Cl Figure 8-13. Undervoltage Relay Test Set-Up (c) In one step, reduce voltage to 99 volts. (a) Connect 120 VAC, 400 hertz supply DSl and DS2 shall transfer states within 4 to 8 seconds. (d) Increase voltage slowly to l13 volts. Lamps DSl and DS2 shall transfer states. (e) In one step, lower voltage to 48 volts. Transfer of states of DSl and DS2 shall be instant- aneouss. (f) Reduce frequency to 50 Hz and repeat the procedures in paragraphs (a) through (f) with the same results. — (5) TO test the DC relay assembly (A5), connect the dc relay assembly in a test circuit as illustrated in figure 8-13A and proceed as follows: across terminals 18 and 22 of dc relay assembly and close Sl switch. Measure resistance between ter- minals 7 and 8 and 19 and 20. Measured resistance should be 2500 ohms for both measurements. If this reading is not obtained check for defective resistors R3, R7, R8, defective rectifier CR4 or defective relay K7. (b) Remove power from assembly and measure resistance between terminals 19 and 20, and 7 and 8 of dc relay assembly. Resistance should be 7500 ohms for both measurements. If this reading is not obtained check for defective relay K7. (c) Check continuity. between terminals 11 and 10 and 21 and 23. (Ohmmeter + lead placed on terminals 11 and 21). There should be continuity. If there is no continuity check for defective diode CR3 or CR6. Change 1 8-18A

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