What it means
F33112 means that Encoder 3 reports an internal error to the drive: within the serial protocol of its position telegram the encoder sets its error bit, so the position value arrives flagged as faulty by the encoder itself. The S120/S150 manual titles the message Encoder 3: Encoder signals an internal error
, the G130/G150 manual Encoder 3: Error bit set in the serial protocol
— both describe the same condition.
Depending on the drive configuration, the same condition can also be output without a reaction or as an alarm instead of as a fault.
Why it appears
- The encoder sets the error bit within the serial protocol of the position telegram and thereby signals an internal error of the encoder itself to the drive.
What to check
- Read the fault value of the message from r0949 and interpret it in binary.
- If bit 0 is set to 1 (fault bit in the position protocol) and an EnDat encoder is connected, evaluate F31111, which may provide further details on the encoder error.
Reading the message value
- The drive enters the fault value as the message value and stores it in r0949; interpret the value in binary.
- Bit 0: fault bit in the position protocol — bit 0 = 1 confirms that the encoder has set its error bit in the position protocol.
Parameters the manual names
- r0949 — read the fault value of F33112 here and interpret it in binary; for this code, bit 0 indicates the fault bit set in the position protocol.
Acknowledging and restarting
The message must be acknowledged before the drive restarts, and the drive only accepts the acknowledgment while the pulses are inhibited, i.e. once the drive has stopped pulsing. Where the condition is configured to appear without a reaction or as an alarm, no acknowledgment is required.
What differs between the drive families
Straight from the manuals' own fields — F33112 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | Servo: OFF1 (IASC/DCBRK, NONE, OFF2, OFF3) Vector: OFF1 (IASC/DCBRK, NONE, OFF2, OFF3) Hla: OFF1 (NONE, OFF2, OFF3) | PULSE INHIBIT | Actual position/speed value incorrect or not available (11) | Encoder 3 | SINAMICS S120, S150 List Manual · p. 3136 |
| G130, G150 | OFF1 (IASC/DCBRK, NONE, OFF2, OFF3) | PULSE INHIBIT | Actual position/speed value incorrect or not available (11) | Encoder 3 | SINAMICS G130, G150 List Manual · p. 1811 |
The drives this code lives on
F33112 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 F33112 on a SINAMICS mean?
Encoder 3 has set the error bit in the serial protocol of its position telegram, so the encoder itself is signaling an internal error to the drive.
How do I fix F33112?
Read the fault value in r0949 and interpret it in binary. If bit 0 = 1 and an EnDat encoder is connected, F31111 may provide further details; then acknowledge the fault once the pulses are inhibited.
Which encoder does F33112 refer to?
The message always refers to Encoder 3, the encoder assigned as encoder 3 on the drive object.
Can F33112 also appear as an alarm?
Yes — depending on the drive configuration it can also be output with no reaction or as an alarm, and in these cases no acknowledgment is required.
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 F33xxx group · SINAMICS manuals · Siemens manuals