Cause : Speed controller monitoring (active in operating states of – –, I, II)

The monitor responds when the difference between the connectors selected in P590 and P591 (factory setting: Setpoint/actual value difference of speed controller) exceeds the limit set in parameter P388 for longer than the time set in parameter P390.

Possible fault causes
• Open control loop
• Controller not optimized
• P590 or P591 is not correctly parameterized