TP-5737 5/01 59Section 7 Component Testing and Adjustment
High output voltage is
detected
Turn safeguard circuit breaker to
the OFF position. Does output
voltage remain high?
Remove G and F+ (red)
leads from the SCR
assembly. Does output
voltage remain high?
Turn the safeguard circuit
breaker to the ON position. Is
sensing voltage (190--277
volts) at leads V7 and V8
available at the regulator?
Check for open wiring between
the stator and the voltage
regulator
Replace the
SCR assembly
If no voltage is detected,
replace the photo
transistor board
Test the stator
windings
Replace
the
voltage
regulator
If the sensing voltage
is low, check the
voltage on all phases.
Is voltage balanced on
all windings?
If the sensing
voltage is high,
replace the
voltage regulator
YesNo
Yes
No
No
Yes
Yes
No
Figure 7 -2 Troubleshooting Generator, High Output Voltage
Accidental starting.
Can cause severe injury or death.
Disconnect the battery cables before
working on the generator set.
Remove the negative (--) lead first
when disconnecting the battery.
Reconnect the negative (--) lead last
when reconnecting the battery.
WARNING
Disabling the generator set. Accidental starting can
cause severe injury or death. Before working on the
generator set or connected equipment, disable the generator
set as follows: (1) Move the generator set master switch to the
OFF position. (2) Disconnect the power to the battery charger.
(3) Remove the battery cables, negative (--) lead first.
Reconnect the negative (--) lead last when reconnecting the
battery. Follow these precautions to prevent starting of the
generator set by an automatic transfer switch, remote
start/stop switch, or engine start command from a remote
computer.
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