Test 5 - Field Flash Alternator - Generac Power Systems XT-EFI Series Manual

Section 1 AC Diagnostic Tests
Test 5 – Field Flash Alternator
(Configuration "A" Only)
General Theory
The alternator utilizes residual magnetism within the
windings to charge the capacitor. If the generator has not
been started for a long period of time, residual
magnetism could be lost within the rotor. Field flashing
the capacitor will restore voltage into the capacitor.
IMPORTANT NOTE: The capacitor may need to be
discharged before testing. A capacitor can be discharged by
crossing the terminals with a metal insulated screw driver.
IMPORTANT NOTE: Use proper protective equipment
when dealing with a capacitor that has exploded.
Procedure
Construct an energizing cord similar to
1.
and connect as shown in Figure 28.
Set START-RUN-STOP switch to OFF.
2.
CRIMP ON STANDARD
FEMALE BLADE
CONNECTORS
PLUG ENERGIZING CORD
INTO AC OUTLET
Danger: The capacitor may need to be
discharged before testing. A capacitor can
be discharged by crossing the terminals
with a metal insulated screw driver.
Danger: Use proper protective equipment
when dealing with a capacitor that has
exploded.
12
Figure 3-6
MOMENTARY PUSHBUTTON ON/OFF SWITCH
SINGLE POLE SWITCH ON LIVE SIDE
12 AWG
4 ft.
DO NOT SUBSTITUTE ANY OTHER DEVICE
Figure 3-6. Construction of Energizing Cord
DEPRESS SWITCH FOR
ONE SECOND
CAPICITOR REMAINS CONNECTED
TO GENERATOR
Figure 3-7. Connecting Energizing Cord
IMPORTANT NOTE: Do NOT energize the capacitor for
more than 1 second at a time.
Momentarily turn on energizing cord (one second).
3.
Disconnect energizing cord from capacitor.
4.
Carefully re-connect the DPE winding leads to the
5.
capacitor.
If the field flash was successful, the generator
6.
should produce approximately 240 VAC at the
main circuit breaker of the generator when the
generator is started and running.
IMPORTANT NOTE: Do not field flash alternator more
than two times in sequence. If the unit has not produced
power after two attempts, other issues exist and need to
be addressed.
Results
Generator produces approximately 240 VAC, stop
1.
testing.
Generator does not produce 240 VAC, refer to
2.
Troubleshooting Flowcharts.
CAPACITOR
12 AWG
STANDARD
MALE PLUG
003923
003924
Diagnostic Repair Manual