What it means
The drive checks the incremental position of Encoder 2 every time the zero pulse is passed. A32431 is raised when this check detects that the deviation from the expected position is too large. Depending on the drive configuration, the same condition can also be output as a fault or with no reaction (N).
Why it appears
- The incremental position of Encoder 2 deviates too much from the expected position when the zero pulse is passed.
- With equidistant zero marks, the first zero mark passed supplies the reference point for all subsequent checks; each further zero mark must then lie at n times the distance referred to the first zero mark. If the zero marks no longer keep these distances, the drive detects the deviation.
- With distance-coded zero marks, the first zero mark pair supplies the reference point for all subsequent checks; each further zero mark pair must keep the expected distance to the first zero mark pair.
What to check
- Check that the encoder cables are routed in compliance with EMC.
- Check the plug connections.
- Replace the encoder or the encoder cable.
- Clean the coding disk or remove strong magnetic fields.
Reading the message value
- The message value carries the alarm value of this message; it is stored in r2124.
- Interpret the alarm value as a decimal number: it is the deviation in quadrants, where 1 pulse corresponds to 4 quadrants.
Parameters the manual names
- r2124 — read the alarm value of A32431 here as a decimal number; it shows the position deviation in quadrants (1 pulse = 4 quadrants).
Acknowledging and restarting
A32431 as an alarm does not require an acknowledgement. If the drive configuration outputs the same condition as a fault, it must be acknowledged immediately before the drive can be restarted.
The same on every family
Every manual that describes A32431 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Actual position/speed value incorrect or not available (11) | Encoder 2 | SINAMICS S120, S150 List Manual · p. 3109 |
| G130, G150 | NONE | NONE | Actual position/speed value incorrect or not available (11) | Encoder 2 | SINAMICS G130, G150 List Manual · p. 1786 |
The drives this code lives on
A32431 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 alarm A32431 on a SINAMICS drive mean?
Encoder 2 has detected a too large deviation in the incremental position when the zero pulse was passed. The first zero mark passed is the reference point for all further checks, and every following zero mark must appear at the expected distance.
How do I fix alarm A32431?
Check that the encoder cables are routed in compliance with EMC and check the plug connections. If the deviation persists, replace the encoder or encoder cable, clean the coding disk or remove strong magnetic fields.
How large is the deviation of A32431 and where do I read it?
The alarm value in r2124, interpreted as a decimal number, states the deviation in quadrants. One pulse corresponds to 4 quadrants.
Does A32431 have to be acknowledged?
No, as an alarm it requires no acknowledgement. If the drive configuration outputs the same condition as a fault, it must be acknowledged immediately before the drive can be restarted.
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 A32xxx group · SINAMICS manuals · Siemens manuals