8493

Category: Alarm

Cause

1. For an AC200V servo unit, AC supply voltage is 120V or below; for an AC400V servo unit, AC supply voltage is 220V or below
2. Supply voltage drops during operation
3. Momentary power failure
4. Servo unit fuse blown
5. Servo unit fault

Corrective action

1. Measure the supply voltage and adjust it to the normal range.
2. Measure the supply voltage and increase power supply capacity.
3. Measure the supply voltage; if the momentary power failure hold time (Pn509) has been changed, set it to a smaller value.
4. Replace the servo unit and connect a reactor before using the servo unit again.
5. The servo unit may be faulty. Replace the servo unit.