SECTION II. UNITED 500-AMPERE MODEL GASR-500 TEST STAND

TM 9-2920-258-30&P

SECTION II

UNITED 500-AMPERE MODEL GASR-500 TEST STAND

D-1

General

The procedure in this section is performed to determine whether the Alternator is functioning in accordance

with manufacturer's specifications for ampere and voltage output when operated under normal conditions.

This procedure is for use with a United 500-ampere Model GASR-500 test stand. For further information refer

to TM 9-4910-663-12.

D-2

Testing Procedure Without 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.

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 Millivoltmeter 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 Tachometer select switch in the DIRECT DRIVE position.

G AC ammeter range switch at X 5.

H AC ammeter select switch in the T1 position.

AC voltmeter range switch at X 2.

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

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

L Generator field in the INT GND position.

M Polarity reversing switch in the NEG GND position.

N Field circuit in the OFF position.

O Fine control switch (0-5) in the OFF position.

P Field current increase (0-5) counterclockwise.

D-8