Test 5 - Field Flash Alternator - DeWalt DXGN4500 Manual

Section 1 Capacitive Discharge (Brushless)
NOTE: Only one outlet on each receptacle needs to be
tested.
Results
If any other reading than continuity was measured,
1.
further troubleshooting needs to be done to
determine if it is the receptacle or the wiring.
If receptacles test good, refer to flow chart.
2.
0.01 Ohms
Figure 1-6. Checking Continuity of Receptacles
Test 5 – Field Flash Alternator
General Theory
The alternator utilizes residual magnetism within the
windings to charge the capacitor. If the generator has not
CRIMP ON STANDARD
FEMALE BLADE
CONNECTORS
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.
6
12 AWG
4 ft.
Figure 1-7. Construction of Energizing Cord
PLUG ENERGIZING CORD
INTO AC OUTLET
CAPICITOR REMAINS CONNECTED
TO GENERATOR
Figure 1-8. Connecting Energizing Cord
been started for a long period of time, the residual
magnetism could be lost within the rotor. Field flashing
the rotor while connected in parallel with the capacitor will
force a charge of electricity through the excitation
winding. The voltage that is induced into the rotor will
charge the rotor with enough residual magnetism it will
charge the capacitor during normal operation.
Electrocution. Potentially lethal voltages are present
in this equipment. Render the equipment safe before
attempting repairs or maintenance. Failure to do so
will result in death or serious injury.
Procedure
Construct an energizing cord similar to
1.
and connect as shown in
Set START-RUN-STOP switch to OFF.
2.
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.
MOMENTARY PUSHBUTTON ON/OFF SWITCH
SINGLE POLE SWITCH ON LIVE SIDE
DO NOT SUBSTITUTE ANY OTHER DEVICE
DEPRESS SWITCH FOR
ONE SECOND
DANGER
Figure 1-8.
12 AWG
MALE PLUG
CAPACITOR
Diagnostic Repair Manual
(000343)
Figure 1-7
STANDARD
003923
003924