What it means
F30051 — Power unit: Motor holding brake short circuit detected. The drive raises this fault when the power unit has detected a short-circuit at the terminals of the motor holding brake. The manuals that describe this code give the same cause and the same remedy for every converter family, so one description covers all of them.
Why it appears
- The power unit has detected a short-circuit at the terminals of the motor holding brake.
What to check
- Check the motor holding brake for a short-circuit.
- Check the connection and the cable of the motor holding brake.
Reading the message value
- The message value is the fault value stored in r0949, and it is interpreted as a decimal number.
- The manuals publish no decoding of this value: they state that it is only for internal Siemens troubleshooting.
Parameters the manual names
- r0949 — fault value; when F30051 is active the drive writes the fault value here and it must be read as a decimal. The content is not decoded for on-site use, since it is only for internal Siemens troubleshooting.
Acknowledging and restarting
After the motor holding brake and its connection and cable have been checked and the short-circuit remedied, acknowledge the fault immediately. The drive coasts down on this fault and will not start again until the acknowledgement has been carried out.
What differs between the drive families
Straight from the manuals' own fields — F30051 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF2 | IMMEDIATELY | External measured value / signal state outside the permissible range (16) | Power Module | SINAMICS S120, S150 List Manual · p. 2958 |
| G130, G150 | OFF2 | IMMEDIATELY | External measured value / signal state outside the permissible range (16) | Power Module | SINAMICS G130, G150 List Manual · p. 1667 |
| G120 | OFF2 | IMMEDIATELY | External measured value / signal state outside the permissible range (16) | — | SINAMICS G120 · p. 915 |
| G120XA | OFF2 | IMMEDIATELY | — | — | SINAMICS G120XA PN converter · p. 1161 |
The drives this code lives on
F30051 is described for G120, G120XA, G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F30051 mean on a SINAMICS drive?
It means the power unit has detected a short-circuit at the terminals of the motor holding brake. The drive coasts down and must be acknowledged before it will start again.
How do I clear fault F30051?
Check the motor holding brake for a short-circuit, then check the connection and cable of the brake. Once the short-circuit has been remedied, acknowledge the fault.
What is the fault value of F30051 in r0949?
The fault value is stored in r0949 and is read as a decimal number. The manuals do not decode it, because it is only for internal Siemens troubleshooting.
Why does the drive report F30051?
Because a short-circuit was detected at the motor holding brake terminals. The brake itself and its connection and cable are the two items the manuals name for checking.
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