What it means
For encoder 3, the drive monitors the position by comparing the position derived from the Hall signals with the position derived from track C/D and the A/B tracks (manual title: Encoder 3: Position difference hall sensor/track C/D and A/B too large). The fault is initiated when the error of track C/D is greater than ±15° mechanical or ±60° electrical, or when the error of the Hall signals is greater than ±60° electrical. For scale: one period of track C/D corresponds to 360° mechanical, and one period of the Hall signal corresponds to 360° electrical.
The same condition can also be output without any reaction or as an alarm, depending on the drive's configuration. In particular, After the fine synchronization using one reference mark or 2 reference marks for distance-coded encoders, this fault is no longer initiated, but instead, Alarm A33429.
Why it appears
- The error of track C/D is greater than ±15° mechanical or ±60° electrical.
- The error of the Hall signals is greater than ±60° electrical.
- The monitoring responds, for example, when Hall sensors are connected as an equivalent for the C/D tracks with the incorrect rotational sense.
- The monitoring also responds when the supply values are not accurate enough.
What to check
- Check whether track C or track D is not connected.
- Correct the direction of rotation of the Hall sensor if it is connected as an equivalent for track C/D.
- Check that the encoder cables are routed in compliance with EMC.
- Check the adjustment of the Hall sensor.
Reading the message value
- Track C/D: measured deviation as a mechanical angle (16 bits with sign, 182 dec corresponds to 1°); interpret the fault value in r0949 as decimal.
- Hall signals: measured deviation as an electrical angle (16 bits with sign, 182 dec corresponds to 1°); interpret the fault value in r0949 as decimal.
Parameters the manual names
- r0949 — holds the fault value of this fault; read it as a decimal number to obtain the measured deviation: as a mechanical angle for track C/D, as an electrical angle for the Hall signals, with 182 dec corresponding to 1°.
Acknowledging and restarting
After the cause has been eliminated, acknowledge the fault; the drive accepts the acknowledgement only while the pulses are inhibited, i.e. while the drive is not enabled. The drive can then be restarted. Note that once fine synchronization with one reference mark (or 2 reference marks for distance-coded encoders) has been carried out, the drive no longer trips this fault and signals Alarm A33429 instead.
What differs between the drive families
Straight from the manuals' own fields — F33129 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. 3142 |
| 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. 1817 |
The drives this code lives on
F33129 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 F33129 mean on SINAMICS drives?
The position of encoder 3 from the Hall signals deviates too far from the position of track C/D and A/B: more than ±15° mechanical or ±60° electrical on track C/D, or more than ±60° electrical on the Hall signals.
How do I read the fault value of F33129?
In r0949, interpreted as a decimal number. 182 dec corresponds to 1°, read as a mechanical angle for track C/D and as an electrical angle for the Hall signals.
Why does A33429 appear instead of F33129?
After the fine synchronization using one reference mark — or 2 reference marks for distance-coded encoders — the drive no longer initiates this fault and signals Alarm A33429 instead.
How do I clear F33129 and restart the drive?
Remove the cause (track C or D not connected, wrong rotational sense of an equivalent Hall sensor, EMC routing of the encoder cables, Hall sensor adjustment), then acknowledge the fault with the pulses inhibited and restart the drive.
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