What it means
A31461 is an alarm from the analog sensor evaluation of Encoder 1, channel B: the drive measures an input voltage at the analog sensor that lies outside the permissible limits. Depending on the drive's configuration, the same condition can also be signaled with no reaction (N). The alarm itself triggers no protective action and does not need to be acknowledged; instead, the drive stores an alarm value in r2124 that names the violated limit.
Why it appears
- The input voltage of the analog sensor at encoder 1 is outside the permissible limits.
- Which of the limits was exceeded is stored as the alarm value in r2124, to be interpreted as a decimal number (see below).
What to check
- Read the alarm value in r2124 (as a decimal number) to determine which case applies.
- Alarm value 1 — input voltage outside the detectable measuring range: check the output voltage of the analog sensor.
- Alarm value 2 — input voltage outside the selected measuring range: check the voltage setting for each encoder period (p4675).
- Alarm value 3 — the absolute value of the input voltage has exceeded the range limit: check the range limit setting and increase it if necessary (p4676).
Reading the message value
- The drive stores an alarm value in r2124; interpret it as a decimal number.
- 1: input voltage outside the detectable measuring range.
- 2: input voltage outside the selected measuring range (p4675).
- 3: the absolute value of the input voltage has exceeded the range limit (p4676).
Parameters the manual names
- r2124 — alarm value: read it as a decimal number; it tells you which limit channel B has violated (1, 2 or 3).
- p4675 — voltage per encoder period of analog sensor channel B: check this selected measuring-range setting when the alarm value is 2.
- p4676 — range limit threshold of the analog sensor: check this setting and increase it if necessary when the alarm value is 3.
Acknowledging and restarting
No acknowledgement is required for this alarm, neither in the alarm form nor when the condition is signaled with no reaction (N). Remedy the cause as described above; after that, no further action is needed on the drive.
The same on every family
Every manual that describes A31461 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. 3057 |
| G130, G150 | NONE | NONE | Actual position/speed value incorrect or not available (11) | Encoder 1 | SINAMICS G130, G150 List Manual · p. 1742 |
The drives this code lives on
A31461 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 A31461 mean?
The input voltage of the analog sensor on encoder 1, channel B, is outside the permissible limits. The alarm value in r2124 shows which measuring-range limit was exceeded.
How do I fix alarm A31461?
It depends on the alarm value in r2124: for 1 check the output voltage of the analog sensor, for 2 check the voltage setting per encoder period (p4675), for 3 check and if necessary increase the range limit (p4676).
Does A31461 stop the drive?
No. The drive raises this alarm without any protective reaction, and no acknowledgement is required; the same condition may also be configured to appear with no reaction (N).
Where can I see why A31461 was raised?
Read r2124 as a decimal number: 1 means the voltage is outside the detectable measuring range, 2 outside the selected range (p4675), and 3 that its absolute value exceeded the range limit (p4676).
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