508Fault · Encoder / feedbackUsually repairable
SIMODRIVE 611U 508: Zero Mark Monitoring, Motor Measuring System
What 508 means
The measured rotor position changes between two zero marks, which means encoder pulses are being lost.
Symptoms
Fault while running, often at higher speed or when the cable flexes.
Is it repairable?
Yes: encoder and cable repair.
Common causes
- Intermittent encoder cable or connector
- Poor shielding
- Dirty or failing encoder
Safe checks
- 1Check the cable and connectors, especially in cable tracks
- 2Make sure the shield is clamped at the drive
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
- 028Actual current sensing during power-up
- 504Measuring circuit error, motor measuring system
- 505Measuring circuit error, motor measuring system absolute track