What it means
F37850 is raised when the HF Damping Module reports an internal software error. The manual stops at this statement: it does not break the error down into causes inside the module, and the fault value belonging to the message — stored in r0949 and interpreted as a decimal number — is expressly reserved for internal Siemens troubleshooting rather than decoded for on-site use. The code is described for SINAMICS S120 and S150.
Why it appears
- An internal software error has occurred in the HF Damping Module.
What to check
- Replace the HF Damping Module.
- If required, upgrade the firmware in the HF Damping Module.
- Contact Technical Support.
Reading the message value
- The drive writes the fault value belonging to this message to r0949; interpret the value as a decimal number.
- The manual gives no decoding for this value: it is intended only for internal Siemens troubleshooting, so it provides no pointer for on-site diagnosis.
Parameters the manual names
- r0949 — fault value of the message; read it as a decimal number. For F37850 the manual assigns the content to internal Siemens troubleshooting only.
Acknowledging and restarting
A simple acknowledgment does not clear this fault: the drive's power supply must be switched off and on again before the message can be acknowledged. If the drive raises F37850 again after powering up, work through the remedy above — firmware upgrade of the HF Damping Module if required, replacement of the module — or contact Technical Support.
The same on every family
Every manual that describes F37850 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF1 (NONE, OFF2, OFF3) | POWER ON | Hardware/software error (1) | None | SINAMICS S120, S150 List Manual · p. 3272 |
The drives this code lives on
F37850 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does SINAMICS fault F37850 mean?
It means an internal software error has occurred in the HF Damping Module. The manual does not break the error down further; the fault value in r0949 is reserved for internal Siemens troubleshooting.
How do I clear fault F37850?
Switch the drive's power supply off and on again — this fault can only be acknowledged after power-on. If it comes back, upgrade the firmware in the HF Damping Module if required, replace the module, or contact Technical Support.
Can I evaluate the r0949 fault value of F37850 myself?
No. The manual states that the value, interpreted as a decimal number, is only for internal Siemens troubleshooting and gives no decoding for it.
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 F37xxx group · SINAMICS manuals · Siemens manuals