What it means
F31152 means that the encoder evaluation of Encoder 1 has received a signal frequency on tracks A/B above its maximum input frequency. The evaluation sits on the Sensor Module Encoder 1, which is where the code is raised. The fault value stored with the code is the actual signal frequency in Hz, so the page value tells you directly how high the encoder frequency was. Depending on the drive configuration, the same condition can also be signalled as an alarm (A) or as a message without any reaction (N) instead of a tripping fault.
Why it appears
- The maximum signal frequency of the encoder evaluation has been exceeded — the encoder connected as Encoder 1 feeds a higher input frequency to the evaluation than the evaluation can process.
What to check
- Reduce the speed: the signal frequency on the encoder tracks falls with the speed, and the code is only raised once that frequency passes the maximum input frequency of the evaluation.
- If the speed required by the application cannot be reduced far enough, use an encoder with a lower pulse number and set the new pulse number in p0408.
Reading the message value
- The drive stores the fault value in r0949; interpret it as a decimal number.
- The value is the actual signal frequency (input frequency) in Hz measured by the encoder evaluation — a single decimal figure, not a bit pattern.
Parameters the manual names
- r0949 — fault value: read the stored value here as a decimal to see the actual signal frequency in Hz that raised the code.
- p0408 — rotary encoder pulse number: this is where Encoder 1's pulse number is set; the remedy is to move to an encoder whose pulse number is lower than the value entered here.
Acknowledging and restarting
The acknowledgement of this fault is linked to pulse inhibit: once the cause has been removed, acknowledge the fault — the acknowledgement takes effect when the drive's pulses are inhibited. After that the drive can be started again. When the same condition is instead configured as an alarm (A) or as a message without reaction (N), the drive neither reacts nor requires an acknowledgement.
What differs between the drive families
Straight from the manuals' own fields — F31152 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | Infeed: ENCODER (NONE, OFF1, OFF2) Servo: ENCODER (IASC/DCBRK, NONE, OFF1, OFF2, OFF3, STOP2) Vector: ENCODER (IASC/DCBRK, NONE, OFF1, OFF2, OFF3, STOP2) Hla: ENCODER (NONE, OFF1, OFF2, OFF3, STOP2) | PULSE INHIBIT | Error in the parameterization / configuration / commissioning procedure (18) | Sensor Module Encoder 1 | SINAMICS S120, S150 List Manual · p. 3044 |
| G130, G150 | Vector: ENCODER (IASC/DCBRK, NONE, OFF1, OFF2, OFF3, STOP2) Infeed: ENCODER (NONE, OFF1, OFF2) | PULSE INHIBIT | Error in the parameterization / configuration / commissioning procedure (18) | Sensor Module Encoder 1 | SINAMICS G130, G150 List Manual · p. 1731 |
The drives this code lives on
F31152 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 fault F31152 mean?
Encoder 1 has exceeded the maximum signal frequency of its evaluation: the input frequency on tracks A/B is higher than the evaluation can process. The fault value in r0949, read as a decimal, is the actual frequency in Hz.
How do I clear fault F31152?
Reduce the speed and, if that is not sufficient, use an encoder with a lower pulse number and set it in p0408. Then acknowledge the fault with the pulses inhibited.
Where can I read the frequency that triggered F31152?
In r0949, interpreted as a decimal value. It holds the actual signal frequency in Hz that the encoder evaluation measured.
Why does F31152 appear on my drive as an alarm instead of a fault?
The same condition can be issued as a fault, as an alarm (A) or without any reaction (N); the drive's configuration decides. As an alarm or message without reaction, neither a reaction nor an acknowledgement occurs.
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 F31xxx group · SINAMICS manuals · Siemens manuals