Section IV. LOAD MEASURING UNIT

Figure 8-19. Excitation Assembly System Test Set-Up

Figure 8-20. Load Measuring Unit Disassembly

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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TM 5-6115-545-34 (2) Adjust Set Point (R212) control to obtain rated (2) Perform checks in accordance with paragraph 16-11. voltage at generator output terminals. e. Equipment Test. If the excitation assembly has been b. Stability. Adjust R207 for optimum stability. replaced, repaired or adjusted refer to Chapter 16, Section II and — conduct the following tests. c. Gain. Adjust R211 for 14K ohms nominal. (1) Regulation range test. Refer to paragraph 16-14. d. Parallel Adjustment Procedures - Reactive Load Sharing. (2) Frequency and voltage regulation, stability and transient response test, short term. Refer to paragraph 16-15. (1) Connect an external load bank capable of loading the generator set to full load at 0.8 power factor. Section IV. LOAD MEASURING UNIT 8-15. Scope. This section contains repair instructions for the load measuring unit. 8-16. Removal. See figure 8-1 and remove the load measuring unit (7) as follows: a. Unscrew electrical connector. b. Remove screws (5) which secure load measuring unit (7) bottom of relay table (52). 8-17. Disassembly, NOTE Tag all electrical leads removed during disassembly for positive identification during reassembly. See figure 8-20 to disassemble the load measuring unit. 8-18. Testing. a. Connect load measuring unit in test circuit as illus- trated in figure 8-21. b. With 120 volts on M3, no load on load bank (Rd), and 0 volts indicated on voltmeter (M1), voltmeter (M2) shall in- dicate 0 to 0.4 Vdc. Resistor RI (17, fig. 8-20), internal to load measuring unit, may be adjusted to obtain this reading. c. With load on Rd, and 5.6 volts ac indicated on Ml, voltmeter M2 shall indicate 9.4 to 9.8 Vdc. d. Select intermediate loads of Rd, and observe that the — voltage relationships indicated by Ml and M2 are identical to the relationships indicated by the graph in figure 8-22. Adjust R1 to obtain this relationship. e. Replace a defective load measuring unit, if voltage relationships do not match the graph. 8-19. Repair, Reassembly and Installation. a. Repair. Replace load measuring unit that does not meet testing requirements. b. Reassembly. See figure 8-20 and reassemble the load — measuring unit. c. Installation. See figure 8-1 and install the load meas- uring unit (7) on relay table (52) with screws (5). 8-28 Change 8

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