With regulator

foldout 6.

(2) Switch positions. Before starting the varidrive, place the test

stand switches and selectors in the following positions:

(a) Place the DC ammeter selector (1) in the 150A position.

(b) Place the DC ammeter selector (2) in the 5A position.

(c) Place the DC voltmeter selector (5) in the 50V position.

(d) Place the DC voltmeter selector (6) in the RECT GEN position.

(e) Set field circuit switch (36) in the REGULATOR position.

(f) All load switches (34) in their OFF positions.

(g) Set the ground polarity switch (33) in the negative (-)

position.

(h) Set ignition switch (IGN) in the OFF position.

(i) Set battery selector (31) in the OFF position.

(3) Testing procedure. Start the varidrive by actuating the start

button (28) and turning the drive speed control (42) counterclockwise (CCW) until

the generator pulley is operating at 2,000 RPM.

(a) Turn the field current control (41) fully clockwise (CW).

(b) Turn the battery selector (31) to the 24V position.

(c) Set the ignition switch (IGN) to the ON position. If the LOAD

DC ammeter reads above 10 amperes, snap ON the 25A and 0-25A switches (34) of the

load bank.

(d) Turn ON the master load switch (39).

(e) The DC voltmeter should indicate 28 volts.

1. If 28 volts are not indicated, remove the drive end housing

pipe plug and adjust the variable resistor on the regulator for 28 volts.

2.

If the regulator will not adjust, then stop tests and

replace the regulator.

(f) Apply the load and increase the load current slowly to 60

amperes by adjusting the load current control (41).

1.

DC voltmeter should indicate 28 volts.

2.

DC ammeter field current (2) should not read over 1 ampere.

OS 010, 4-P15