What it means
A31412 is raised when Encoder 1 signals an internal alarm via the serial protocol: the encoder itself reports the problem, and the drive receives a set error bit in that protocol. The manuals phrase this either as an internal alarm signalled by the encoder or as an error bit set in the serial protocol — both describe the same condition. Depending on the drive's configuration, the same condition can also be output as a fault (F) or as a message without reaction (N) instead of an alarm. The alarm value in r2124 shows which bit the encoder set.
Why it appears
- The encoder signals an internal alarm via the serial protocol: the alarm originates in the encoder itself, which sends a set error bit to the drive.
- The set bit is either the fault bit or the alarm bit in the position protocol; the alarm value in r2124 tells which of the two it is.
What to check
- Carry out a POWER ON (switch-off/switch-on) for all components.
- Check that the encoder cables are routed in compliance with EMC.
- Check the plug connections.
- Replace the encoder.
Reading the message value
- The message value contains the alarm value, which the drive stores in r2124; interpret binary.
- Bit 0: Fault bit in the position protocol.
- Bit 1: Alarm bit in the position protocol.
Parameters the manual names
- r2124 — alarm value: read it for this alarm and interpret binary to see whether Bit 0 (fault bit in the position protocol) or Bit 1 (alarm bit in the position protocol) is set.
Acknowledging and restarting
As an alarm, A31412 does not have to be acknowledged; no manual acknowledgement is required. If the drive's configuration outputs the same condition as a fault, the fault is acknowledged immediately once the cause has been removed. The remedy in both cases is a POWER ON (switch-off/switch-on) of all components before the drive runs again.
The same on every family
Every manual that describes A31412 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 1 | SINAMICS S120, S150 List Manual · p. 3050 |
| G130, G150 | NONE | NONE | Actual position/speed value incorrect or not available (11) | Encoder 1 | SINAMICS G130, G150 List Manual · p. 1736 |
The drives this code lives on
A31412 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 A31412 mean on a SINAMICS drive?
It means Encoder 1 has signalled an internal alarm via the serial protocol — the encoder itself sends a set error bit to the drive. The alarm value in r2124 shows whether the fault bit (Bit 0) or the alarm bit (Bit 1) in the position protocol is set.
How do I clear A31412?
Carry out a POWER ON (switch-off/switch-on) for all components, check that the encoder cables are routed in compliance with EMC, and check the plug connections. If the alarm persists, replace the encoder.
Does A31412 have to be acknowledged?
No — as an alarm it does not have to be acknowledged. If the drive is configured to output the same condition as a fault instead, the fault is acknowledged immediately.
What is r2124 for A31412?
r2124 holds the alarm value and must be interpreted binary. Bit 0 means the fault bit in the position protocol is set, Bit 1 means the alarm bit is set.
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 A31xxx group · SINAMICS manuals · Siemens manuals