8240

Category: Alarm

Cause

1. STO is active
2. Abnormal STO power supply
3. STO failure

Corrective action

1. Check whether the STO function has been activated. Normal use requires no action. After the STO terminal is restored, use the fault reset function to clear the fault.
2. Check whether the STO power supply is normal. Measure whether the 24V STO supply is stable, and secure any loose or disconnected wiring.
3. If the fault still occurs after confirming the above 2 points, replace the drive.