TM-9-2920-257-30-P
GENERATOR, ALTERNATING CURRENT, 200 AMPERES
TECHNICAL MANUAL; DIRECT SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS
MAY 1987
TM-9-2920-257-30-P - Page 25 of 111
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
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