VOLTAGE REGULATOR MODULE (A1)
TESTING AND ADJUSTING
VOLTAGE REGULATOR MODULE (A1)
One of the components used in the voltage
regulator assembly on the SR 4 Generator is the
regulator module (A1). It is a completely sealed unit.
Failure of the regulator is usually. caused by failure of
other components in the circuits of the voltage regulator
assembly.
A regulator module (A1) with a defect can cause
any of the following conditions:
No AC voltage
AC voltage too low
AC voltage too high
Lack of AC voltage stability
NOTE: Do not install a new regulator module (A1)
until you have thoroughly tested all of the other
components and circuits in the voltage regulator
assembly.
Tests can be made on the regulator module
when the engine is running or is stopped. To test the
regulator when the engine is running, install a single-
pole, single-throw (SPST) switch in series with wire (24).
This switch must have the ability to automatically turn off
when it is released. Screw terminals must be on the
switch.
NOTE: Remove wire (24) from terminal (24). Connect
switch to wire (24). Install another wire between the
other side of the switch and terminal (24).
Start the engine and run it at 1200 to 1250 rpm.
Close the switch for a moment and read the value of the
line voltage. If the generated voltage is approximately
the same percent of rated voltage as the low idle rpm is
of rated rpm, the regulator is working correctly.
SPTS SWITCH INSTALLED IN SERIES IN WIRE (24).
Example: If an electric set is rated for 240 volts
at 1800 rpm (60 hertz), it will generate 160 volts at 1200
rpm (40 hertz).
Run the engine at high idle rpm and close the
switch for a moment. Read the line voltage while the
switch is closed. If the line voltage is approximately the
same as rated voltage, the regulator module is working
correctly. If the failure condition does not change, the
regulator module can have a defect.
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