8491

Category: Alarm

Cause

1. Excessive internal servo unit supply voltage; open regenerative resistor circuit
2. DC power is supplied while AC power input is configured
3. AC power is supplied while DC power input is configured. 4. The regenerative resistor capacity (Pn600) is set to a value other than 0, but there is no external regenerative resistor
4. The B2-B3 power terminal jumper has come off on a servo unit of a capacity other than those above
5. Servo unit fault

Corrective action

1. Measure the regenerative resistance using a measuring instrument. When using the servo unit built-in regenerative resistor, replace the servo unit. When using an external regenerative resistor, replace the regenerative resistor.
2. Confirm whether the supply is DC; match the power supply setting to the supply used.
3. Confirm whether the supply is AC; match the power supply setting to the supply used.
4. Check the external regenerative resistor connection and Pn600 value. Connect an external regenerative resistor, or set Pn600 to 0 when an external regenerative resistor is not needed.
5. Check the power terminal jumper wiring and connect the jumper correctly.
6. The servo unit may be faulty. Replace the servo unit.