OPERATION AFTER REPAIR
TESTING AND ADJUSTING
PROCEDURE FOR FIRST OPERATION AFTER REPAIR
Do not run the electric set at rated rpm
immediately after repair. The following procedure can
prevent new failures if the CAUSE of the first failure
condition was not correctly found.
1.
Disconnect wires (10 and 19) from regulator
assembly (A1). Cover the terminal of wires (10
and 19) with insulation tape.
2.
Start the engine and run it at 1200 to 1250 rpm.
The residual magnetism in the exciter field (L3)
and the rotating field (L5) will give approximately
3 to 4 volts as measured at terminals (20) and
(22). If the controlled rectifier has a short circuit,
the generator will give a higher output voltage.
Install a new controlled rectifier (CR9).
3.
Stop the engine and connect wires (10 and 19)
to spade terminals (10 and 9) of regulator
assembly (A1).
4.
Start the engine and run it at 1200 to 1250 rpm.
The output voltage will be approximately 67 to
70 percent of the generator rated voltage. If the
output voltage is too high (much higher than 70
percent of rated voltage), the failure is probably
in the regulator module (A1).
5.
With the engine running at a low idle rpm and
the
generator
giving
a
constant
voltage
(approximately 60 to 70 percent of rated
voltage), move the governor control to let the
engine come up gradually to rated rpm. Make
an adjustment to the voltage level control (R2)
until the generator is at rated voltage. The
generator is now ready to use.
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