What it means
F37045 reports a power supply fault in the HF Damping Module: the voltage monitor on the module has signalled an undervoltage fault. The code is described for the S120 and S150. While the fault is active the drive coasts down, and it can only be restarted once the fault has been acknowledged by switching the component off and on again.
Why it appears
- A power supply fault exists in the HF Damping Module.
- The module's voltage monitor signals an undervoltage fault on the module.
What to check
- Check the 24 V DC voltage supply of the HF Damping Module.
- Carry out a POWER ON for the component — switch it off and then on again.
- Replace the module if the fault persists.
Reading the message value
- The fault value is stored in r0949 and is interpreted as a decimal number.
- For this fault the value is the 24 V voltage, stated in units of 0.1 V.
Parameters the manual names
- r0949 — fault value: read the stored 24 V voltage here (decimal interpretation) to see the undervoltage the module's voltage monitor detected.
Acknowledging and restarting
The fault is acknowledged with a POWER ON: switch the HF Damping Module off and back on again. If the undervoltage is still present after switching on, the fault returns — replace the module in that case.
The same on every family
Every manual that describes F37045 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. 3265 |
The drives this code lives on
F37045 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F37045 mean on a SINAMICS S120 or S150?
It means the voltage monitor in the HF Damping Module has signalled an undervoltage fault on the module, i.e. a power supply fault. The drive coasts down while the fault is active.
How do I clear F37045?
Check the 24 V DC voltage supply of the HF Damping Module, then carry out a POWER ON — switch the component off and on again. Replace the module if the fault comes back.
Where can I read the fault value of F37045?
In r0949, interpreted as a decimal number. It holds 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