Installation manual

PROBLEM
No AC voltage output at no load.
Residual volta~e produced at no load
15- 20 volts A .
Low AC voltage output at no load
60-100 VAC.
High AC output voltage
150 VAC or higher.
BE TROUBLESHOOTING
NOTE: AC GENERATOR TROUBLESHOOTING MUST
BE PERFORMED WITH ENGINE OPERATING AT 60 HERTZ
PROBABLE CAUSE
1. Short or open in the
4. Open in exciter
main stator winding. stator winding.
2. Shorted pozi-resistor
on exciter rotor.
5. Open in rotating
freld winding.
3. Four or more shorted or
open diodes on exciter rotor.
1. Faulty voltage regulator.
2. Short or open to wiring
to voltage regulator.
3. Shorted or open main
stator auxiliary winding.
1. Reset voltage potentiometer. 4. Faulty voltage regulator.
2. Open or shorted diodes in
exciter rotor 1 to 3 diodes.
5. Short in exciter stator winding.
3. Open or shorted exciter
rotor winding.
. 6. Short In rotating field winding.
1.
Reset voltage potentiometer.
2. Faulty voltage regulator.
Unstable voltage output. Engine Speed Steady
1. Adjust voltage regulator. · 2. Faulty voltage regulator.
AC voltage drop under load 1. Diode(s) on exciter rotor.
60 - 1 00 volts AC.
breaking down when load is
applied (inductive) 1-3 diodes.
Engines & Generators
48