020Fault · Control moduleUsually repairable
SIMODRIVE 611U 020: NMI Due To Cycle Failure
What 020 means
The control module's basic cycle failed, either from electrical noise or a hardware fault.
Symptoms
Random trips, sometimes when nearby equipment switches.
Is it repairable?
Yes: 611U control modules are repaired at component level and tested on a drive.
Common causes
- Poor grounding or shielding
- Loose plug-in connections
- Control module hardware fault
Safe checks
- 1Check plug-in connections, cabinet grounding and noise suppression on contactors and brakes. If it continues on a clean installation, the module is faulty
Drives hold dangerous voltage after power-off. Checks should only be done by qualified personnel, with power isolated and the DC link discharged.
Reviewed by AutomIQ repair technicians. Code and name from the SIMODRIVE 611 universal Function Manual.
Related SIMODRIVE 611U faults
- 003NMI due to watchdog
- 006Checksum test error
- 028Actual current sensing during power-up
- 504Measuring circuit error, motor measuring system
- 505Measuring circuit error, motor measuring system absolute track
- 507Synchronization error, rotor position