Cause : Live zero error comes when programmed in parameter 6-01 Live Zero Timeout Function. The signal on 1 of the analog inputs is less than 50% of the minimum value programmed for that input.

1. Broken wiring or faulty device sending the signal can cause this condition.
2. Check connections on all the analog input terminals.
3. Control card terminals 53 and 54 for signals, terminal 55 common.
4. Check that the frequency converter programming and switch settings match the analog signal type.
5. Perform the input terminal signal test.