What it means
The HF Damping Module raises F37002 when the damping voltage reaches an inadmissibly high value. The fault value stored with the code records how high the damping voltage was at the moment of the fault; the live quantity can be watched in r5171, the HF damping voltage actual value, while working through the remedy.
Why it appears
- A motor harmonic with a high amplitude has coincided with the resonance frequency of the output filter.
- The current controller excites the resonance of the output filter excessively.
What to check
- Reduce the motor power in the proximity of the frequency at which the fault is generated.
- Check the current controller and adapt it if required.
- If required, use another motor.
Reading the message value
- The drive writes the damping voltage present at the moment of the fault into the message value: read r0949, interpreting the value as a decimal number — it is stated in mV.
- The value is not decoded bit by bit; the complete number is the damping voltage itself.
- The manual cross-references r5171 (HF damping voltage actual value) for observing this quantity directly.
Parameters the manual names
- r0949 — fault value: read it as a decimal number here to see the damping voltage in mV that was present when F37002 occurred.
- r5171 — CO: HF damping voltage actual value (HF U_damp ActV): displays the damping voltage the code complains about, so it can be followed while applying the remedy.
Acknowledging and restarting
With F37002 the drive coasts down immediately (OFF2). Acknowledge the fault immediately — once the cause has been removed — before starting the drive again.
The same on every family
Every manual that describes F37002 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF2 | IMMEDIATELY | General drive fault (19) | None | SINAMICS S120, S150 List Manual · p. 3260 |
The drives this code lives on
F37002 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F37002 mean on a SINAMICS S120 or S150?
It means the HF Damping Module has measured an inadmissibly high damping voltage. Typically a strong motor harmonic coincided with the resonance of the output filter, or the current controller over-excited that resonance.
How do I fix fault F37002?
Reduce the motor power near the fault-generating frequency, check the current controller and adapt it if required, and if required use another motor. The drive coasts down, so acknowledge the fault immediately before restarting.
Where can I see the damping voltage that triggered F37002?
In r0949, interpreted as a decimal number: it holds the damping voltage in mV at the moment of the fault. The live HF damping voltage actual value is shown in r5171.
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