8490

Category: Alarm

Cause

1. Supply voltage exceeds the specified range
2. Insufficient external regenerative resistance or regenerative resistor capacity, or continuous regenerative operation
3. Continuous negative load causes continuous regenerative operation
4. The capacity set in parameter Pn600 is lower than the external regenerative resistor capacity
5. Excessive external regenerative resistance
6. Servo unit fault

Corrective action

1. Measure the supply voltage and set it within specification. 2. Reconfirm operating conditions or capacity, change the regenerative resistance and regenerative resistor capacity, and readjust operating conditions.
2. Confirm the load applied to the running servo motor; reconsider the system, including the servo, mechanism, and operating conditions.
3. Check the regenerative resistor connection and Pn600 value; correct parameter Pn600.
4. Confirm whether the regenerative resistance is correct; change to the correct resistance and capacity.
5. The servo unit may be faulty. Replace the servo unit.