Test Stand Shutdown - TM-9-2920-258-30-P0060

TM 9-2920-258-30&P

10 Using a multimeter, place the red lead on terminal "ac" and ground the black lead. Check for 12-

16 volts AC.

11 If the Alternator meets the above requirements, it is serviceable.

Test Stand Shutdown

1 Turn the field current (0-30 amps) counterclockwise.

2 Turn the battery select switch to the OFF position.

3 Turn the master load switch to the OFF position.

4 Turn the speed control clockwise and reduce speed to 1000 rpm.

5 Depress the STOP button.

6 Return ail switches to the base setting.

D-3

Testing Procedure With Regulator

Refer to TM 9-4910-663-12 for test stand general preparation and operation procedures. Use the following

information for testing procedures specific to the 180 ampere Alternator (ref Figure D-4).

Preparation

1 Connect the test cable to the Alternator.

2 Mount the Alternator on the test stand.

3 Set the controls and switches of the test stand to the base setting. The base setting is as follows:

A DC bad ammeter range switch at X 10.

B DC field ammeter range switch at X 6.

C Millivottmeter range switch at X 10.

D DC voltmeter range switch at X 5.

E DC voltmeter select switch in the RECT/GEN position. (NOTE: Select switch position for test

stand model 7458-4 set to EXT.)

F AC ammeter range switch at X 5.

G AC ammeter select switch in the T1 position.

H AC voltmeter range switch at X 2.

I AC voltmeter select switch in the T1-T2 position.

J External field exciter switch (AC system) in the OFF position.

K Generator field in the INT GND position.

L Polarity reversing switch in the NEG GND position.

D-12