What it means
F31950 is raised when an internal software error occurs in Sensor Module Encoder 1. The manuals for the S120/S150 and the G130/G150 describe this fault identically for Sensor Module Encoder 1, and beyond the fault value itself they publish no further detail about how the internal error arises.
Why it appears
- An internal software error has occurred in Sensor Module Encoder 1.
What to check
- If necessary, upgrade the firmware in the Sensor Module to a later version.
- If the fault is not cleared this way, contact Technical Support.
Reading the message value
- The drive stores the fault value in r0949; interpret the value as a decimal number.
- The fault value contains information regarding the fault source. The manual publishes no decoding and states that the value is used only for internal Siemens troubleshooting.
Parameters the manual names
- r0949 — fault value: this is where the drive stores the decimal fault value naming the fault source for F31950; no evaluation of it outside Siemens troubleshooting is documented.
Acknowledging and restarting
The drive responds to this fault with an OFF2. Acknowledgement is by POWER ON only: switch the power supply off and on again before the drive will restart. If the fault reappears after the power cycle, upgrade the Sensor Module firmware to a later version if necessary and contact Technical Support.
The same on every family
Every manual that describes F31950 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | ENCODER (OFF2) | POWER ON | Hardware/software error (1) | Sensor Module Encoder 1 | SINAMICS S120, S150 List Manual · p. 3081 |
| G130, G150 | ENCODER (OFF2) | POWER ON | Hardware/software error (1) | Sensor Module Encoder 1 | SINAMICS G130, G150 List Manual · p. 1763 |
The drives this code lives on
F31950 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 F31950 mean?
It reports an internal software error in Sensor Module Encoder 1. The manuals for the S120/S150 and the G130/G150 describe the fault identically.
How do I clear fault F31950?
It is acknowledged by switching the power supply off and on again (POWER ON). If the fault returns, upgrade the firmware in the Sensor Module to a later version if necessary and contact Technical Support.
What does the fault value of F31950 in r0949 mean?
The drive writes a decimal value to r0949 that contains information regarding the fault source. The manual gives no decoding, because this value is only for internal Siemens troubleshooting.
Does F31950 also occur on the G130 or G150?
Yes — the G130/G150 and S120/S150 list manuals both describe this fault for Sensor Module Encoder 1 with the same remedy.
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