What it means
F31812 is raised for Encoder 1 on the Sensor Module when the encoder does not support what is asked of it — the manual titles the condition Encoder 1: Requested cycle or RX-/TX timing not supported
. Either a cycle requested from the Control Unit or the requested RX and TX timing is not supported by the encoder, and the drive stores the details of the rejected request as a decimal fault value in r0949. Depending on the drive's configuration, the same condition can also be issued as an alarm (A) or with no reaction (N).
Why it appears
- The encoder does not support a cycle that was requested from the Control Unit.
- The encoder does not support the requested RX/TX timing.
What to check
- Carry out a POWER ON — switch the components off and switch them on again, and do this for all components.
Reading the message value
The drive enters the fault value into r0949; interpret it as a decimal number:
- 0: Application cycle is not supported.
- 1: DRIVE-CLiQ cycle is not supported.
- 2: Distance between RX and TX instants in time too low.
- 3: TX instant in time too early.
Parameters the manual names
- r0949 — read the fault value here, interpreted as a decimal number, to see which requested cycle or which RX/TX timing instant the encoder rejected.
Acknowledging and restarting
The drive trips and the fault must be acknowledged immediately before it will run again. The manual's remedy is the switch-off/switch-on described above, carried out for all components, so the acknowledgement is followed by powering the components down and up again. When the drive is configured to output this condition as an alarm (A) or with no reaction (N), no reaction takes place and no acknowledgement is required (NONE).
The same on every family
Every manual that describes F31812 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF2 | IMMEDIATELY | Error in the parameterization / configuration / commissioning procedure (18) | Sensor Module Encoder 1 | SINAMICS S120, S150 List Manual · p. 3065 |
| G130, G150 | OFF2 | IMMEDIATELY | Error in the parameterization / configuration / commissioning procedure (18) | Sensor Module Encoder 1 | SINAMICS G130, G150 List Manual · p. 1749 |
The drives this code lives on
F31812 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 fault F31812 mean on a SINAMICS drive?
Encoder 1 on the Sensor Module does not support a cycle or the RX/TX timing that was requested from the Control Unit. The decimal fault value in r0949 shows which case applies.
How is F31812 cleared?
Acknowledge it immediately and carry out a POWER ON, switching all components off and back on again. If the condition is configured as an alarm or notification, neither reaction nor acknowledgement applies.
What do fault values 2 and 3 of F31812 mean?
Value 2 means the distance between the RX and TX instants in time is too low. Value 3 means the TX instant in time is too early.
Can F31812 also appear as an alarm?
Yes. Depending on the drive's configuration, the same condition can also be issued as an alarm (A) or with no reaction (N); in those cases no reaction is triggered.
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