What it means
F30055 is raised when the drive detects an overcurrent condition in the braking chopper of the power unit. The drive coasts down, and the fault must be acknowledged immediately before the drive can run again.
Why it appears
- The power unit has detected an overcurrent condition in its braking chopper.
What to check
- Check whether the braking resistor has a short circuit.
- If the braking resistor is an external one, check whether it may have been dimensioned too small.
Acknowledging and restarting
Acknowledge the fault immediately. The braking chopper is only enabled again at pulse enable once the fault has been acknowledged, so after a restart it stays inactive until pulses are enabled again.
What differs between the drive families
Straight from the manuals' own fields — F30055 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF2 | IMMEDIATELY | Braking Module faulted (14) | None | SINAMICS S120, S150 List Manual · p. 2960 |
| G130, G150 | OFF2 | IMMEDIATELY | Braking Module faulted (14) | None | SINAMICS G130, G150 List Manual · p. 1668 |
| G120 | OFF2 | IMMEDIATELY | Braking Module faulted (14) | — | SINAMICS G120 · p. 916 |
The drives this code lives on
F30055 is described for G120, G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F30055 mean on a SINAMICS drive?
It means the power unit has detected an overcurrent condition in the braking chopper. The drive coasts down and the fault has to be acknowledged immediately.
How do I clear fault F30055?
Check whether the braking resistor has a short circuit and, for an external braking resistor, whether it may have been dimensioned too small. Then acknowledge the fault immediately.
Why is the braking chopper still inactive after acknowledging F30055?
The braking chopper is only enabled again at pulse enable after the fault has been acknowledged. It therefore remains inactive until pulses are enabled once more.
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 F30xxx group · SINAMICS manuals · Siemens manuals