What it means
F37040 reports that the 24 V power supply of the HF Damping Module has failed: the voltage undershot the undervoltage threshold for longer than 3 ms. The drive switches off in response, and the component only comes back after the fault has been acknowledged with a POWER ON. The voltage that was present at the moment of the fault is stored in r0949.
Why it appears
- Failure of the 24 V power supply for the HF Damping Module.
- The undervoltage threshold was undershot for longer than 3 ms.
What to check
- Check the 24 V DC voltage supply of the HF Damping Module.
Reading the message value
- The fault value is stored in r0949 and is to be interpreted as a decimal number.
- The value shows the 24 V voltage in steps of 0.1 V.
Parameters the manual names
- r0949 — fault value: read it as a decimal number to see the 24 V voltage that was present when the fault was raised, given in units of 0.1 V.
Acknowledging and restarting
Once the 24 V supply has been checked, carry out a POWER ON for the HF Damping Module — switch the component off and on again. This POWER ON is the acknowledgement of the fault.
The same on every family
Every manual that describes F37040 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF2 | IMMEDIATELY (POWER ON) | Supply voltage fault (undervoltage) (3) | None | SINAMICS S120, S150 List Manual · p. 3264 |
The drives this code lives on
F37040 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F37040 mean?
It means the 24 V power supply of the HF Damping Module failed: the voltage undershot the undervoltage threshold for longer than 3 ms.
How do I clear fault F37040?
Check the 24 V DC voltage supply of the HF Damping Module and, once it is restored, carry out a POWER ON (switch-off/switch-on) for the component.
What does the fault value of F37040 tell me?
In r0949, interpreted as a decimal number, the drive stores the 24 V voltage in units of 0.1 V.
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