TP-5737 5/0160 Section 7 Component Testing and Adjustment
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
Moving rotor.
WARNING
Disconnecting the electrical load. Hazardous voltage can
cause severe injury or death. Disconnect the generator set
from the l oad by opening the line circuit breaker or by
disconnecting the generator set output leads from the transfer
switch and heavily taping the ends of the leads. High voltage
transferred to the load during testing may cause personal
injury and equipment damage. Do not use the safeguard
circuit breaker in place of the line circuit breaker. The
safeguard circuit breaker does not disconnect the generator
set from the load.
Follow all safety precautions located in the front of this
manual and the additional precautions found within the
text. Figure 7-3 lists the various generator output
conditions and component tests. Refer to Figure 7-4,
AC Voltage Control for assistance in troubleshooting.
7.2 Generator Testing
This section covers generator testing for the following
generator conditions:
D No output on any phase
D Overvoltage
D Fluctuating voltage
7.2.1 No Output On Any Phase
No Output On Any Phase Test Procedure
1. Check the safeguard breaker, if equipped. If the
safeguard breaker is open, close the breaker and,
with the set running, check the AC voltmeter for AC
output voltage.
2. If AC output is not present, then:
a. Check wire 1B from the safeguard breaker and
wire 7N (ground) to the voltage regulator.
b. Check for voltage to the safeguard breaker, if
equipped.
3. If all items in step 2 are functioning, proceed to
Section 7.3, LED Circuit Board Test, and
Section 7.5, Automatic Voltage Regulator (AVR)
Operation and Adjustment.
4. If tests indicate LED and AVR are functioning
correctly, proceed with the test of the photo
transistor board and SCR assembly (see
Section 7.4). Otherwise, continue with the AVR
test.
5. If the photo transistor board test indicates the
board is functioning correctly, proceed to the
exciter armature test as described later in
Section 7.8.
6. If the exciter armature test indicates the armature is
functioning correctly, proceed to the generator field
test as described later in Section 7.7.
7. If the generator field test indicates the field is
functioning correctly, replace the SCR assembly or
the photo transistor board as described later in
Section 7.4.
Components and Circuits to Test Under Certain Generator Output Conditions
Generator
Output
Condition
LED
Board
Photo
Transistor
Board
Automatic
Voltage
Regulator (AVR)
SCR
Assembly
Safeguard
Breaker
Exciter
Armature
Generator
Field
Generator
Stator
Voltage
Adjustment
Pot
No
Output
D D D D D D D D D*
Over
Voltage
D[ D D
Fluctuating
Voltage
D D D D D D D
* No output voltage if voltage adjustment potentiometer circuit is open or shorted to ground.
[ Overvoltage may occur if an outside light source is present when the LED board and cover are removed.
Figure 7 -3 Troubleshooting Guide
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