Cause : Parameter system comes when parameter load or save failed. The fault code 6581 in your ABB ACS880 drive indicates a parameter system fault, specifically a parameter load or save failure. This means the drive encountered an issue while trying to load or save parameters.

Causes of Parameter Load/Save Failure:

The 6581 fault signifies a problem during the loading or saving process of these parameters. Here are some common reasons:

1. Power Failure: A sudden power interruption during the loading or saving process can corrupt the parameter data.
2. Memory Unit Issue: The memory unit that stores the parameters might be faulty or malfunctioning.
3. Communication Error: If using an external device to load/save parameters (like a PC tool), a communication error between the drive and the device could cause the failure.
4. Corrupted Parameter File (if applicable): If you're loading parameters from an external file, the file itself might be corrupted.