What it means
F37311 reports that the heat sink of the HF Choke Module — the reactor module — has exceeded the permissible temperature limit. The drive trips into a coasted, pulse-blocked state and stays locked out until the fault has been acknowledged. The code is described for SINAMICS S120 and S150.
Why it appears
- Insufficient cooling, for example a failed fan.
- Overload of the module.
- Ambient temperature too high.
What to check
- Check whether the fan is running.
- Check the fan elements.
- Check that the ambient temperature is within the permissible range.
- Check the motor load.
Reading the message value
- The message value is the fault value, stored in r0949. Read it as a decimal number: it is the heat sink temperature in steps of 0.01 °C.
Parameters the manual names
- r0949 (fault value) — read it after the trip to see the heat sink temperature that raised F37311; interpret the value as a decimal, in 0.01 °C steps.
Acknowledging and restarting
Acknowledge the fault in the usual way. The drive only accepts the acknowledgement once the heat sink has cooled down: the fault can only be acknowledged after the alarm threshold for alarm A05000 has been undershot. Until that point the drive remains locked out in the pulse-blocked state of the fault reaction.
The same on every family
Every manual that describes F37311 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. 3267 |
The drives this code lives on
F37311 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F37311 mean on a SINAMICS S120 or S150?
It reports that the heat sink of the HF Choke Module (the reactor module) has exceeded the permissible temperature limit. The fault value in r0949 shows the temperature in 0.01 °C steps.
Why will F37311 not acknowledge?
The drive only accepts the acknowledgement once the heat sink has cooled below the alarm threshold of alarm A05000. Let the module cool, clear the cause, then acknowledge.
What should I check first when F37311 appears?
Start with the cooling: check whether the fan is running and check the fan elements. Then verify that the ambient temperature is in the permissible range and check the motor load for overload.
How do I read the temperature that caused F37311?
Read the fault value in r0949 and interpret it as a decimal number; the value is 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