What it means
F31813 reports that the logic unit of the DRIVE-CLiQ encoder evaluated as encoder 1 has failed. For the G130/G150 the same condition is worded as the DRIVE-CLiQ encoder fault word supplying fault bits that have been set. The drive stores which of the two reported ALU conditions raised the fault in the fault value r0949, which is interpreted binary.
Why it appears
- The logic unit of the DRIVE-CLiQ encoder has failed.
- On the G130/G150 the cause is described as: the DRIVE-CLiQ encoder fault word supplies fault bits that have been set.
What to check
- Read the fault value in r0949 in binary form to see which of the two bits is set.
- Inhibit the power unit's pulses, acknowledge the fault and restart the drive.
- Replace the encoder; for the S120/S150 the wording is
When the error reoccurs, replace the encoder.
Reading the message value
- The drive places the fault cause in r0949; the message value carries it as a binary figure (%1 bin).
- Bit 0: ALU watchdog has responded.
- Bit 1: ALU has detected a sign-of-life error.
Parameters the manual names
- r0949 — fault value: read it in binary form to identify whether bit 0 (ALU watchdog) or bit 1 (ALU sign-of-life error) raised F31813.
Acknowledging and restarting
F31813 is acknowledged with pulse inhibit: the power unit's pulses must be inhibited before the fault can be acknowledged. Once acknowledged, the drive can be restarted. Should the encoder's logic unit fail again, the fault returns and the encoder must be replaced.
What differs between the drive families
Straight from the manuals' own fields — F31813 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | Infeed: NONE Servo: ENCODER (IASC/DCBRK, NONE) Vector: ENCODER (IASC/DCBRK, NONE) Hla: ENCODER (NONE) | PULSE INHIBIT | Hardware/software error (1) | Sensor Module Encoder 1 | SINAMICS S120, S150 List Manual · p. 3065 |
| G130, G150 | Vector: ENCODER (IASC/DCBRK, NONE) Infeed: NONE | PULSE INHIBIT | Hardware/software error (1) | Sensor Module Encoder 1 | SINAMICS G130, G150 List Manual · p. 1750 |
The drives this code lives on
F31813 is described for G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F31813 mean on a SINAMICS drive?
It means the logic unit (ALU) of the DRIVE-CLiQ encoder connected as encoder 1 has failed; the encoder's fault word reports set fault bits.
How do I interpret the fault value of F31813?
r0949 holds the fault cause in binary form: bit 0 set means the ALU watchdog has responded, bit 1 set means the ALU has detected a sign-of-life error.
How do I clear F31813?
Inhibit the pulses, acknowledge the fault and restart the drive; replace the encoder if the error reoccurs.
Codes next to this one
Source
Written from Siemens' own List Manuals and operating instructions; every number, designation and parameter on this page is checked against them before publication.
All SINAMICS codes: fault and alarm codes · the F31xxx group · SINAMICS manuals · Siemens manuals