F31885Fault · Encoder 1Usually repairable
SINAMICS S120 F31885: Encoder 1 DRIVE-CLiQ (CU) Cyclic Data Transfer Error
Also shown as: Can be set as N, A
What F31885 means
Cyclic data from encoder 1 over DRIVE-CLiQ was lost or corrupted between the Control Unit and the encoder module.
Symptoms
Random trips, often when cables flex as the machine moves.
Is it repairable?
Yes: SMI encoder modules and Sensor Modules are repairable.
Common causes
- Damaged DRIVE-CLiQ cable or connector
- Poor shielding or electrical noise
- Failed Sensor Module or motor encoder (SMI)
- Unstable 24 V supply
Safe checks
- 1Inspect and reseat DRIVE-CLiQ connectors
- 2Check cable routing away from power cables
- 3Check the 24 V supply under load
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 SINAMICS S120/S150 List Manual.
Related SINAMICS S120 faults
- F07011Motor overtemperature
- F07900Motor blocked/speed controller at its limit
- F30001Overcurrent
- F30002DC link voltage overvoltage
- F30003DC link voltage undervoltage
- F30004Overtemperature heat sink AC inverter