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 TM 9-2320-280-24P
CAUTION
If either of leads 2 or 3, which sense generator output voltage, is broken or
disconnected, the no load generator output voltage will immediately rise to
greater than 2 times the normal voltage. The overvoltage module accessory
protects equipment from this high voltage.
NOTE
The generator will sustain a short circuit current of 2.5 to 3 times rated
current for approximately 10 seconds without damage to the generator. In
order to prevent damage to the generator from short circuit current for longer
periods, a protection circuit is included in the AVR. This circuit senses
excess voltage (over 60 volts) across the dc exciter terminals X and XX.
When the voltage exceeds 60 volts, a timing circuit is activated. In
approximately 10 seconds after it is activated, the protection circuit de-
energizes the dc exciter, collapsing generator output. The protection circuit
will not reset until after the engine has stopped (approximately 10 seconds).
ASSEMBLY
a. Replace the rectifier assembly.
(1)
Position the positive and negative rectifier assembly plates (1, Figure 4-4) o the molded base (6) and install
n
washers and nuts.
(2)
Install the varistor (5) and connect the terminal lead. Torque the terminal lead to 36-42 in-lb (4.8 N m).
(3)
Install the positive and negative diodes (2, 4). Refer to paragraph 3-13.
(4)
Refer to tags and connect rotor wiring to their terminals on the rectifier assembly. Remove tags.
b. Install the bearing and bearing cartridge.
NOTE
The bearing will be easier to install in the cartridge if the cartridge is heated. Heat the cartridge in an
oven at 212 (100 ) for one hour.
F
C
WARNING
Use insulated gloves to handle the cartridge.
4-21
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