Siemens alarm F31121: Encoder 1: Coarse position error
SINAMICS S120 encoder fault (Sensor Module / DRIVE-CLiQ encoder) · SINAMICS S120
What it means
During actual-value acquisition the module detected an error implying that the coarse (absolute per-revolution/absolute-scale) position is unreliable. There is no user-side adjustment: the manual's remedy is to replace the DRIVE-CLiQ motor or the associated Sensor Module. Expect this together with other encoder diagnostics if the scanning unit is failing.
Likely causes
- internal failure of the coarse-position evaluation in the sensor
- DRIVE-CLiQ motor encoder electronics defective
- Sensor Module actual-value sensing hardware fault
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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6SL3362-0AG00-0AA1 SME20 Sensor Module
sensor-module · Common cause
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Send us alarm F31121 with your machine details — typical RFQ turnaround is 24–48h.