200 AMP BENCH TESTS

TM 9-2920-257-30&P

E - 4 . 200 AMP BENCH TESTS

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.

Install three belts (UMC part no.

5. Place generator in bracket.

Lock

Check belt tension and alinement.

3L350) between pulleys.

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

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.

Note: on -4 test stand

11. Turn FIELD CIRCUIT switch to REGULATOR.

DC voltmeter to RECT/GEN.

12. Turn MASTER LOAD DISCONNECT switch ON.

1 3 . Press START button.

14. Increase test stand speed to 2000 RPM.

If necessary, adjust

15. Check output voltage for 28 + 1 volts.

rheostat voltage to obtain 28 + 1 volts.

16. Reading DC RANGE ammeter, a d d incremental loads up to 200

AMPS.

Adjust rheostat as needed to maintain voltage.

cannot be obtained at all load

17. If 200 AMPS at 2000 RPM

settings, generator is defective.

Repeat until all

18. Turn rheostat until 24 VDC is obtained.

Turn off applied loads one at a time,

applied loads are removed.

readjusting rheostat to 24 VDC each time a load is removed.

1 9 . Reduce test stand speed to 1000 RPM.

E-5