What it means
The analog sensor evaluated as Encoder 1 has delivered a position value that lies outside the permissible range of -0.5 ... +0.5. The alarm value in r2124, interpreted as a decimal number, identifies which source produced the out-of-range value: the LVDT sensor or the encoder characteristic. The manuals for all affected families describe this code identically. Depending on the drive configuration, the same condition can also be present without a drive reaction (N).
Why it appears
- The position value of the analog sensor at Encoder 1 has exceeded the permissible range of -0.5 ... +0.5.
What to check
- Read the alarm value in r2124 as a decimal number to determine whether the out-of-range position value came from the LVDT sensor (alarm value 1) or from the encoder characteristic (alarm value 2).
- For alarm value 1: check the LVDT ratio (p4678).
- For alarm value 1: check the reference signal connection at track B.
- For alarm value 2: check the coefficients of the characteristic (p4663 ... p4666).
Reading the message value
- The drive stores the alarm value in r2124; interpret it as a decimal number.
- 1: Position value from the LVDT sensor.
- 2: Position value from the encoder characteristic.
Parameters the manual names
- r2124 — alarm value: read it as a decimal number to see whether the out-of-range position value came from the LVDT sensor (1) or from the encoder characteristic (2).
- p4678 — analog sensor LVDT ratio: check this ratio when the alarm value is 1.
- p4663 ... p4666 — coefficients of the encoder characteristic (K0 ... K3): check these coefficients when the alarm value is 2.
Acknowledging and restarting
This alarm requires no acknowledgment and triggers no drive reaction. It ends once the analog sensor's position value is back within the permissible range of -0.5 ... +0.5.
The same on every family
Every manual that describes A31463 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. 1743 |
The drives this code lives on
A31463 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 A31463 mean?
The position value of the analog sensor at Encoder 1 has exceeded the permissible range of -0.5 ... +0.5.
How do I find out which source triggered A31463?
Read the alarm value in r2124 as a decimal number: 1 means the position value came from the LVDT sensor, 2 means it came from the encoder characteristic.
Does A31463 require an acknowledgment or stop the drive?
No. The alarm triggers no drive reaction and needs no acknowledgment; it ends when the position value is back within the permissible range.
Which parameters are checked for A31463?
For alarm value 1 check the LVDT ratio p4678 and the reference signal connection at track B; for alarm value 2 check the characteristic coefficients p4663 ... p4666.
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