Checks And Trouble Shooting; Alternator Trouble Shooting; Corrective Action - Atlas Copco Qas 58Jd Manuel D'instructions

CHECKS AND TROUBLE SHOOTING

Never perform a test run with connected power cables. Never touch an electrical connector without a voltage check.
When a failure occurs, always report what you experience before, during and after the failure. Information with regard to the load
(type, size, power factor, etc.) vibrations, exhaust gas color, insulation check, odors, output voltage, leaks, damaged parts, ambient
temperatures, daily and normal maintenance and altitude might be helpful to quickly locate the problem. Also report any information
regarding the humidity and location of the generator. Refer to the engine manual for troubleshooting engine problems.

ALTERNATOR TROUBLE SHOOTING

Symptom POSSIBLE CAUSE
Alternator doe not excite. Blown Fuse.
Insufficient Voltage.
No residual Voltage.
After being excited, alternator Connections are interrupted.
does not excite.
Low voltage at no load. Voltage potentiometer out of setting.
Intervention of protection.
Winding Failure.
High voltage at no load. Voltage potentiometer out of setting.
Failed regulator.
Lower than rated voltage at Voltage potentiometer out of setting.
load.
Intervention by protection.
Failed regulator.
Higher than rated voltage. Voltage potentiometer out of setting.
Failed regulator.
Unstable voltage. Speed variation in engine.
Regulator out of setting.
1310 3011 32

CORRECTIVE ACTION

Replace Fuse.
Increase speed by 15%.
For an instant apply on the + and – terminals of the electronic regulator a 12 V battery
voltage with a 30 ? resistor in series respecting the polarities.
Check connection cables per drawings.
Reset Voltage.
Check RPM.
Check Windings.
Reset Voltage.
Substitute regulator.
Reset voltage potentiometer.
Current too high, power factor lower than 0.8, speed lower than 4% of rated speed.
Substitute regulator.
Reset Voltage.
Substitute regulator.
Check engine rotation.
Regulate the stability of regulator by acting on "STABILITY" potentiometer.
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