What it means
F37043 reports an overvoltage on the 24 V power supply of the HF Damping Module. The drive raises the fault when that supply exceeds the 31.5 V threshold for longer than 3 ms, so the fault points directly at the 24 V feed of the module.
Why it appears
- The 24 V power supply of the HF Damping Module is delivering an overvoltage — the supply rose above the 31.5 V threshold for more than 3 ms.
What to check
- Check the 24 V DC voltage supply that feeds the HF Damping Module.
Acknowledging and restarting
While the fault is active the drive switches itself off and the motor coasts down. The acknowledgment for this fault requires POWER ON: switch the drive's power supply off and back on. Once the 24 V supply has been checked and the drive is powered up again, the fault is acknowledged and the drive can be restarted.
The same on every family
Every manual that describes F37043 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF2 | POWER ON | Supply voltage fault (overvoltage) (3) | None | SINAMICS S120, S150 List Manual · p. 3265 |
The drives this code lives on
F37043 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F37043 mean on SINAMICS S120/S150?
It reports an overvoltage on the 24 V power supply of the HF Damping Module: the supply exceeded 31.5 V for more than 3 ms.
How do I fix F37043?
Check the 24 V DC voltage supply of the HF Damping Module, then acknowledge the fault by powering the drive off and back on.
Why can't I acknowledge F37043 directly from the operator panel?
This fault requires POWER ON for acknowledgment, so the drive's power supply must be switched off and back on before the fault clears.
At what voltage does F37043 trigger?
When the 24 V supply of the HF Damping Module rises above the 31.5 V threshold for longer than 3 ms.
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