028Fault · Power sectionUsually repairable
SIMODRIVE 611U 028: Actual Current Sensing During Power-Up
What 028 means
At power-up the drive expected zero current but measured current, so the current-sensing hardware is suspect.
Symptoms
Fault every time the drive powers up, before the motor turns.
Is it repairable?
Yes: current-sensing faults in the power section and control module are repairable.
Common causes
- Faulty current sensors or measuring circuit in the power section
- Poorly seated control module
- Control module fault
Safe checks
- 1With power off, reseat the control module in the power section and check its connectors. If the fault stays, the power section or control module needs repair
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
- 020NMI due to cycle failure
- 504Measuring circuit error, motor measuring system
- 505Measuring circuit error, motor measuring system absolute track
- 507Synchronization error, rotor position