OPX300K2 2/18
17
Trouble Shooting
PROBLEM
POSSIBLE CAUSE
RECOMMENDATION(S)
Only a FEW VOLTS
Loss of residual magnetism of the exiter field
• Flash field.
of output
Disconnection or short circuit of windings
• Check the insulation of all windings
and check the resistance value.
Defective AVR
• Check the AVR.
Defective rotating rectifier assembly
• Replace diode elements.
Voltage is LOW
Incorrect wiring (GEN, AVR)
• Check the winding connection.
Low speed
• Check the engine.
Overload
• Reduce the load.
Defective AVR
• Check the AVR.
Voltage DIPS
Starting of big motor or spot welding machine
• About 15% voltage dip is no problem.
when on load
Defective diode on rotating rectifier
• Change diode.
[F(+) – F(-) terminal voltage will show a
very high value when a diode is defective]
Voltage is HIGH
Incorrect wiring (GEN, AVR)
• Check the AVR.
Too high speed
• Check the engine.
Defective AVR
• Check the AVR.
Voltage FLUCTUATES
Wiring leads are loose
• Tighten leads.
Irregular speed of engine
• Check the engine.
Poor AVR adjustment
• Check the AVR.
External noise
• Check the filter.
Abnormal SOUND
Foundation uneven
• Check ground level.
or VIBRATION
Poor mounting
• Check the mounting section.
Misaligned coupling
• Check the coupling section.
Defective bearing
• Replace the bearing.
