EEr-Trip (External error, short-circuit braking requested by controller)

What does 91 mean?

This fault indicates an external error that has triggered a request for short-circuit braking from the controller (KSDs). This means a fault condition outside the drive itself has been detected by the controller, leading it to initiate an emergency stop, highlighting a safety or process-critical issue that requires external investigation.

• External controller command for short-circuit braking.
• Signal loss from an external safety device.
• Faulty wiring in the external control interface.
• Over-speed condition detected by external unit.

Click steps to track your progress.

1. 1

   Review the controller's diagnostic messages for the specific external error triggering this fault.

2. 2

   Verify the status of safety inputs and other external signals connected to the controller or associated with the machine.

3. 3

   Isolate external devices connected to the controller one by one to identify the source of the external error.