What it means
On track A/B of Encoder 1, pulses have been lost or too many have been counted. The rotor position adaptation is presently correcting these pulses, so the alarm reports a correction that is under way; the drive itself takes no automatic action. The alarm value in r2124 shows how far the counted position deviated from the zero mark at the last measurement. Depending on the drive configuration, the same condition can also be issued as a fault (F) or without reaction (N).
Why it appears
- Pulses on track A/B have been lost or too many have been counted.
- The pulses concerned are presently being corrected by the rotor position adaptation.
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.
- Check the encoder limit frequency.
- Adapt the parameter for the distance between zero marks (p0424, p0425).
Reading the message value
- The alarm value is stored in r2124 and is interpreted as a decimal number.
- It contains the last measured deviation of the zero mark in increments.
- 4 increments correspond to 1 encoder pulse.
- The sign designates the direction of motion when detecting the zero mark distance.
Parameters the manual names
- r2124 — alarm value: read here, interpreted as a decimal number, as the last measured zero mark deviation in increments.
- p0424 — encoder linear zero mark distance (Enc lin ZM_dist): adapt this distance between zero marks for a linear encoder as part of the remedy.
- p0425 — encoder rotary zero mark distance (Enc rot dist ZM): adapt this distance between zero marks for a rotary encoder as part of the remedy.
Acknowledging and restarting
No acknowledgement is required: as an alarm, A31432 does not stop the drive, and the rotor position adaptation corrects the deviation while operation continues. If the drive configuration raises the same condition as a fault (F) instead, the fault must be acknowledged immediately before the drive can resume, and the response then depends on the drive object. Issued without reaction (N), no acknowledgement is needed either.
The same on every family
Every manual that describes A31432 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. 3055 |
| G130, G150 | NONE | NONE | Actual position/speed value incorrect or not available (11) | Encoder 1 | SINAMICS G130, G150 List Manual · p. 1740 |
The drives this code lives on
A31432 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 SINAMICS alarm A31432 mean?
Pulses have been lost or too many have been counted on track A/B of Encoder 1, and the rotor position adaptation is presently correcting the resulting deviation. The alarm value in r2124 shows the last measured zero mark deviation in increments.
Does A31432 have to be acknowledged?
No. As an alarm it requires no acknowledgement and the drive keeps operating. Only if the drive configuration raises the same condition as a fault must it be acknowledged immediately.
How do I fix alarm A31432?
Check that the encoder cables are routed in compliance with EMC, check the plug connections, replace the encoder or encoder cable, check the encoder limit frequency, and adapt the zero mark distance parameters p0424 and p0425.
What is the alarm value of A31432?
It is stored in r2124 and is interpreted as a decimal number: the last measured deviation of the zero mark in increments, where 4 increments equal 1 encoder pulse. The sign designates the direction of motion when detecting the zero mark distance.
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