Troubleshooting GP Repair
wc_tx000548gb.fm 86
6.13 Low Voltage at Receptacles—Flowchart 2A
wc_gr003112
Checking brushes
Check condition of brushes and holder.
Are
brushes OK?
Ye s
No
Replace
the brushes.
Checking excitation winding
Check resistance of excitation winding.
Replace
the stator.
Low Voltage at Receptacles
Checking main and rotor windings
Measure the resistance values of the
main windings by measuring across
R & Y (main 2); B & G (main 1).
If you have recently worked on the
generator, be sure the wiring at the
generator terminal strip is correct.
Is the
correct value
measured for main
winding 1?
Replace
the stator.
Ye s
No
Is the
correct value
measured for main
winding 2?
Replace
the stator.
Ye s
No
Is
correct resistance
measured?
No
Ye s
Check resistance of rotor winding.
Is
correct resistance
measured?
No
Ye s
Replace
the rotor.
Checking AVR's sensing wires
Check continuity of sensing wires.
Do
the wires have
continuity?
No
Ye s
Repair or
replace the
wiring.
Replace
the AVR.