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 93 of 111
TM 9-2920-257-30&P
E-4 .
200 AMP BENCH TESTS
a. Generator test
CAUTION
Follow steps as written or voltage spikes may
damage test equipment or pop circuit breaker.
1. Place test stand controls and switches in base settings (para
E-3) .
2. Install bracket (fig. F-6) on test stand .
3. Install pulley (UMC part no. 89335) on test stand.
4. Install pulley assembly 12314043 (3020-01-146-8942) on
generator .
5. Place generator in bracket.
Install three belts (UMC part no.
3L350) between pulleys.
Check belt tension and alinement.
Lock
generator in bracket with chain vise.
6. Verify bus bars are installed from B+ to G+ and B- to G-.
7. Connect generator to test stand cables (see figures F-7 through
F-12) .
8. Adjust rheostat (fig. F-4) maximum resistance.
9. Verify main circuit breaker on test stand is ON.
10. Turn BATTERY CIRCUIT SELECTOR to 24 VOLTS.
11. Turn FIELD CIRCUIT switch to REGULATOR.
Note: on -4 test stand
DC voltmeter to RECT/GEN.
12. Turn MASTER LOAD DISCONNECT switch ON.
13. Press START button.
14. Increase test stand speed to 2000 RPM.
15. Check output voltage for 28 + 1 volts.
If necessary, adjus t
rheostat voltage to obtain 28 + 1 volts.
16. Reading DC RANGE ammeter,
add incremental loads up to 200
AMPS.
Adjust rheostat as needed to maintain voltage.
17. If 200 AMPS at 2000 RPM
cannot be obtained at all load
settings, generator is defective .
18. Turn rheostat until 24 VDC is obtained.
Repeat until al l
applied loads are removed.
Turn off applied loads one at a time,
readjusting rheostat to 24 VDC each
time a load is removed .
19. Reduce test stand speed to 1000 RPM.
E-5
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