What it means
A31407 reports that Encoder 1 has reached one of its function limits; the manual recommends a service. Which of the encoder's functions is at its limit is coded in the alarm value (see the message value below). Depending on how the drive is configured, the same condition can also be issued as a fault (F) or as a message without any drive reaction (N).
Why it appears
- The encoder has reached one of its function limits — a service is recommended. Both manuals describe this cause identically for Encoder 1.
What to check
- Perform the recommended service on the encoder.
- To see how much reserve the encoder still has, enter its component number in p4650 and read the actual functional reserve in r4651.
- Replace the encoder if necessary.
Reading the message value
- The drive stores the message value as the alarm value in r2124; interpret it as a decimal number.
- 1 — Incremental signals
- 3 — Absolute track
- 4 — Code connection
Parameters the manual names
- r2124 — alarm value of this message; read it as a decimal number to identify which function limit the encoder has reached.
- p4650 — enter the component number of the encoder whose functional reserve you want to display.
- r4651 — displays the actual functional reserve of the encoder selected in p4650, so you can judge whether service or replacement is due.
Acknowledging and restarting
As an alarm, A31407 requires no acknowledgment. If the drive is configured to raise the same condition as a fault (F), the fault must be acknowledged immediately before the drive can be restarted; the no-reaction variant (N) likewise needs no acknowledgment. The underlying condition itself is remedied by performing the service and, if necessary, replacing the encoder.
The same on every family
Every manual that describes A31407 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. 3048 |
| G130, G150 | NONE | NONE | Actual position/speed value incorrect or not available (11) | Encoder 1 | SINAMICS G130, G150 List Manual · p. 1734 |
The drives this code lives on
A31407 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 A31407 mean on a SINAMICS drive?
Encoder 1 has reached one of its function limits, and the manual recommends a service. The alarm value shows whether the incremental signals, the absolute track or the code connection is affected.
How can I see which encoder function limit has been reached?
Read the alarm value in r2124 and interpret it as a decimal number: 1 means the incremental signals, 3 the absolute track and 4 the code connection.
How do I check how much functional reserve the encoder still has?
Enter the component number of the encoder in p4650 and read the actual functional reserve in r4651.
Does A31407 have to be acknowledged?
Not as an alarm — it requires no acknowledgment. If the drive raises the same condition as a fault, it must be acknowledged immediately before restarting; the no-reaction variant (N) needs no acknowledgment either.
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