CCr (System failure)

What does 0071 mean?

A system failure has occurred, likely due to strong interference injection on control cables or ground/earth loops in the wiring. This indicates an electrical noise or grounding issue affecting the controller's stability.

• Electromagnetic interference (EMI) ingress through control cables routed too close to power cables or unshielded.
• Ground loop currents flowing through control circuit ground connections due to multiple grounding points at different potentials.
• Insufficient or faulty common mode filtering on the drive's control power supply.
• Internal hardware fault within the drive's control board due to power fluctuations or component degradation.
• Inadequate grounding of the drive chassis or the control cabinet, leading to poor noise dissipation.

Click steps to track your progress.

1. 1

   1. Power down the drive, re-route control cables away from power cables (minimum 10cm separation) and ensure shielding is properly terminated at one end to chassis ground.

2. 2

   2. Verify all grounding connections for the drive and control system are robust and follow a single-point grounding scheme if possible.

3. 3

   3. Check the incoming control voltage at the drive's control power terminals for stability using a multimeter, looking for sags or spikes.

4. 4

   4. Measure the resistance between the drive chassis and the main control cabinet ground to ensure a low impedance path (ideally < 0.1 Ohm).

5. 5

   5. Isolate external control signals by temporarily disconnecting them one by one to identify a potential source of interference.