What it means
F06908 means that the braking module has shut down because of overtemperature at the temperature sensor of the braking resistor. The condition is only reported as this fault once the sensor has been detecting the overtemperature for longer than 60 s.
Why it appears
- Overtemperature at the temperature sensor of the braking resistor was detected there for longer than 60 s, and the braking module shut itself down as a result.
What to check
- Lower the temperature at the temperature sensor of the braking resistor.
- Check the connection of that temperature sensor.
Parameters the manual names
- r3688 — BO 'Braking Module internal overtemperature shutdown': the signal the manual points to directly under this fault; it reports the braking module overtemperature shutdown condition that F06908 signals.
Acknowledging and restarting
The drive coasts down on this fault and will not start again until the fault has been acknowledged. Bring the temperature at the sensor back down and check the sensor connection first, then acknowledge the fault and restart the drive.
The same on every family
Every manual that describes F06908 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| G130, G150 | OFF2 (OFF1) | IMMEDIATELY | Braking Module faulted (14) | None | SINAMICS G130, G150 List Manual · p. 1532 |
| S120, S150 | OFF2 (OFF1) | IMMEDIATELY | Braking Module faulted (14) | None | SINAMICS S120, S150 List Manual · p. 2775 |
The drives this code lives on
F06908 is described for G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F06908 mean on a SINAMICS drive?
The braking module has shut down because the temperature sensor of the braking resistor reported overtemperature, and the sensor had been detecting it for longer than 60 s.
How do I clear fault F06908?
Reduce the temperature at the sensor and check the temperature sensor connection; after that the fault can be acknowledged and the drive started again.
Why does F06908 appear only after some time?
The fault is only raised when the sensor has been detecting the overtemperature for longer than 60 s.
Which parameter belongs to fault F06908?
r3688, the BO 'Braking Module internal overtemperature shutdown', which the manual references directly under this fault.
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 F06xxx group · SINAMICS manuals · Siemens manuals