What it means
F33950 is reported by the Sensor Module Encoder 3 when an internal software error occurs there. The manual describes this fault in the same words for SINAMICS S120, S150, G130 and G150, always referring to the Sensor Module Encoder 3; the error originates in the module's software itself, and no external cause is named for it.
Why it appears
- An internal software error has occurred in the Sensor Module Encoder 3.
What to check
- If necessary, upgrade the firmware in the Sensor Module to a later version.
- Contact Technical Support.
Reading the message value
- The drive stores information about the fault source of this software error in r0949.
- Interpret the value in r0949 as a decimal number.
- The manual marks this information as internal —
Only for internal Siemens troubleshooting.
No decoding that can be acted on on site is printed for this fault.
Parameters the manual names
- r0949 — the fault value of this fault: read it as a decimal number to see the information about the fault source; the manual reserves this value for internal Siemens troubleshooting.
Acknowledging and restarting
A normal acknowledge from the operator panel or the commissioning tool does not clear this fault: the drive only returns to ready state after its power supply has been switched off and switched on again (POWER ON). If F33950 reappears after the restart, upgrade the Sensor Module firmware and, if necessary, contact Technical Support.
The same on every family
Every manual that describes F33950 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF1 (OFF2) | POWER ON | Hardware/software error (1) | Sensor Module Encoder 3 | SINAMICS S120, S150 List Manual · p. 3182 |
| G130, G150 | OFF1 (OFF2) | POWER ON | Hardware/software error (1) | Sensor Module Encoder 3 | SINAMICS G130, G150 List Manual · p. 1852 |
The drives this code lives on
F33950 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 F33950 on my SINAMICS mean?
The Sensor Module Encoder 3 has detected an internal software error. The drive stores information about the fault source in r0949, which the manual says is only for internal Siemens troubleshooting.
How do I clear fault F33950?
An ordinary acknowledge is not enough — the fault is only cleared by switching the drive's power supply off and on again. If it comes back, upgrade the Sensor Module firmware to a later version and contact Technical Support.
Which SINAMICS drives can report F33950?
The code is described for the Sensor Module Encoder 3 on SINAMICS G130, G150, S120 and S150, and the manuals give the same cause and remedy for all of them.
Can I analyse the fault value of F33950 myself?
No. The value in r0949 is interpreted as a decimal number and contains information about the fault source, but the manual states it is only for internal Siemens troubleshooting.
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 F33xxx group · SINAMICS manuals · Siemens manuals