TM-9-2920-257-30&P Maintenance and Parts Manual for 200 Amp M113 Generator Download
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TM 9-2920-257-30&P 2-7. DYNAMIC BENCH TEST PROCEDURES a. Confirm results of On-Vehicle test by these bench tests if possible. When it is not possible to perform On-Vehicle tests, check generator performance quickly by referring to these bench tests. NOTE Test bench must have a 20 Hp motor or larger, capable of driving the generator to 7000 RPM, a multimeter (App D, Item 3) with 0-400 amp range, and 0-40 volt range. b. Mount generator on test bench according to the bench manufacturer's instructions. Refer to Figure 2-13 for set- up to measure voltage and amperage produced by generator. For bench tests, voltage is normal when it is within the normal range of Table 2-2, and amperage is high when it is within +/- 10 % of rated output (output 5000 RPM). c. Run the No-Load Test without electrical load, but with batteries connected. Run generator at 5000 RPM and refer to Table 2-4. Table 2-4. NO-LOAD TEST DIAGNOSIS AMPS VOLTS DIAGNOSIS TEST BENCH BATTERY DISCHARGED OF DEFECTIVE. HIGH LOW ALLOW TO CHARGE OR REPLACE. HIGH NORMAL ALLOW TIME TO STABILIZE WHILE MONITORING VOLTS. IF VOLTS RISE ABOVE NORMAL RANGE (25V- 31V), REGULATOR AND/OR FIELD COIL MUST BE REPLACED. IF AMPS FALL, CHARGING SYSTEM IS OKAY. HIGH HIGH STOP TEST. REGULATOR AND /OR FIELD COIL MUST BE REPLACED. GO TO STATIC TESTS LOW LOW GENERATOR AND/OR REGULATOR MUST BE REPAIRED OR REPLACED. LOW NORMAL REGULATOR IS GOOD, GO TO FULL-LOAD TEST. LOW HIGH STOP TEST. BENCH MALFUNCTION OR WIRING ERROR. 2-18 Change 1