b. With regulator. Once the regulator has been properly installed it may
be connected to the test stand.
Connect the cables and leads to the generator as shown in
(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 (-)
(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
(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.
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).
DC voltmeter should indicate 28 volts.
DC ammeter field current (2) should not read over 1 ampere.
OS 010, 4-P15