Power Tech Generators PTS-30 Operator's Manual page 160

Athlon generators are provided with excitation control systems. Four automatic voltage regulator (AVR)
systems are available across the range of generator models and sizes. The following will assist the user
in determining any faults. Follow the guide for the proper AVR in question.
SYMPTOMS
Generator produces no voltage
Generator produces unstable voltage
Generator produces high voltage
Generator produces low voltage at no load
Generator produces low voltage with load
applied
SOLUTIONS
Check speed with tachometer
Check residual voltage and flash the field
as necessary –– see section 5.3
Verify generator connections
Check diodes
Test and adjust or replace AVR
Check speed with tachometer.
Verify generator connections
Replace defective or worn rheostat
Test and adjust or replace AVR
Check speed with tachometer
Verify generator connections
Check load PF. Leading PF can cause
voltage to climb.
Test and adjust or replace AVR
Check speed with tachometer
Verify generator connections
Check diodes
Test and adjust or replace AVR
Check speed with tachometer
Check diodes
Test and adjust or replace AVR
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