Atlas Copco QAS 500 - Page 87

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Solving problems
The troubleshooting table below shows how to solve problems causing controller alarms. It uses three common problems as an example.
Alarm display Symptom Possible cause Corrective action
High coolant temperature Sensor broken Replace sensor.
Not enough coolant Fill coolant till appropriate level.
Check for leaks.
Obstructed airflow Check air inlets / outlet.
Clean radiator.
Bad connection Check wiring.
Low battery voltage Battery drained Charge battery.
Install battery charger (depending on situation).
Charging alternator broken Measure battery voltage during running.
Replace charging alternator if battery voltage is not OK.
Battery broken Replace battery.
Bad connection Check wiring.
Low oil pressure Not enough oil Fill oil till appropriate level.
Check for leaks.
Sensor broken Replace sensor.
Oil sump broken Check or contact Atlas Copco.
Bad connection Check wiring.