Cycle-by-Cycle Current Limit Fault is one of the common faults during VFD operation. For Oulu VFD, this fault is displayed as ERR/FU40 on the control panel.

Troubleshooting and Solutions:

1. Excessive load or motor stalling:

• Reduce the load and inspect the motor and mechanical system for abnormalities.

• 2. Undersized inverter capacity:

• Replace with a VFD of a higher power rating.