e. Before continuing with the tests, position the field current control
(41) maximum clockwise and the DC ammeter selector (1) to the 150-ampere range.
f.
The line switch (LOAD RELAY) test is as follows:
(1) Temporarily move the regulator lead from the ignition switch to
terminal J1 on the DC power supply.
(2) Place the DC voltmeter selector switch to V or DC-supply.
(3) Turn the DC power supply control fully CCW.
(4) Place DC power supply switch to the ON position.
(5) Turn the test stand main power switch ON.
(6) While observing the DC voltmeter, turn the DC power supply control
slowly clockwise and listen for a "click" from the regulator. The "click"
indicates the closing of the relay.
(7) The relay should close between 15 and 20 volts. If the relay does
not close within these limits, the regulator is considered to be unserviceable.
(8) To discontinue the test, turn the DC power supply fully CCW.
(a) Turn DC power supply switch OFF.
(b) Turn DC voltmeter selector (1) to the RECT/GEN position.
(c) Return the ignition lead to the ignition terminal.
g.
The voltage regulation test is as follows:
Note. -
Read and study the outlined procedures very carefully before proceeding
with the actual tests and adjustments.
CAUTION: During the testing, do not allow the generator voltage to exceed 32 volts
as this could damage the rectifier, and, unless specifically stated, the
battery must be connected in the circuit at all times.
(1) Start the test stand. Turn battery selector and ignition switches
to the ON positions; increase the test stand speed to 2,000 RPM while observing
voltmeter.
CAUTION: Be sure the voltage does not exceed 32 volts at any time during testing.
If the voltage does exceed 32 volts, attempt to obtain a low voltage of
less than 32 volts by using the voltage adjustment on the regulator.
(2) If a stable voltage of 27.5 to 28.5 volts cannot be obtained, the
regulator is unserviceable and should be discarded as directed by the appropriate
technical publication. If the voltage is obtained, proceed to the next step.
(3) Turn the master load (load disconnect) switch to the ON position.
(4) While observing the voltmeter reading, place 25-, 50-,
OS 010, 4-P18
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