What it means
F37004 is raised when the drive measures a heat sink temperature in the HF Damping Module that has exceeded the permissible limit value. The drive then switches off at once by coasting down (OFF2) and will only restart after the fault has been acknowledged. Because the fault is tied to the actual temperature, acknowledgement stays blocked until the heat sink has cooled down — see the notice under Restart.
Why it appears
- The permissible limit value of the heat sink temperature in the HF Damping Module was exceeded.
- Insufficient cooling, for example a fan failure.
- Overload.
- Ambient temperature too high.
What to check
- Check whether the fan is running.
- Check the fan elements.
- Check whether the ambient temperature is in the permissible range.
Reading the message value
The message value %1 carries the temperature that tripped the fault. The manual decodes it as:
- Fault value (r0949, interpret decimal): temperature in 0.01 °C.
Read r0949 as a decimal number; it is scaled in steps of 0.01 °C.
Parameters the manual names
- r0949 — fault value; for F37004 it holds the heat sink temperature of the HF Damping Module, to be interpreted as a decimal value in 0.01 °C.
Acknowledging and restarting
The drive coasts down when F37004 trips, so the fault must be acknowledged before the drive can run again. Acknowledging while the module is still hot will not work: This fault can only be acknowledged after the alarm threshold for alarm A05000 has been undershot.
Let the heat sink cool until the alarm threshold of A05000 is undershot, then acknowledge the fault and restart the drive.
The same on every family
Every manual that describes F37004 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF2 | IMMEDIATELY | Power electronics faulted (5) | None | SINAMICS S120, S150 List Manual · p. 3261 |
The drives this code lives on
F37004 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F37004 mean on a SINAMICS drive?
It reports that the heat sink temperature inside the HF Damping Module has exceeded the permissible limit value. The drive coasts down (OFF2) and stays off until the fault is acknowledged.
How do I clear fault F37004?
Let the heat sink cool first: the fault can only be acknowledged after the alarm threshold for alarm A05000 has been undershot. Once it has, acknowledge the fault and restart the drive.
What causes F37004?
Typical causes are insufficient cooling or a fan failure, an overload, or an ambient temperature that is too high.
Where can I see the temperature that triggered F37004?
Read the fault value in r0949, interpreting it as a decimal number. It gives the heat sink temperature in steps of 0.01 °C.
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