What it means
F30850 reports that an internal software error has occurred in the power unit. The G115D manual lists the same condition as a software fault in the Power Module. The message is accompanied by a fault value that the drive writes to r0949; that value is reserved for internal Siemens diagnostics and yields no on-site diagnosis.
Why it appears
- The software inside the power unit has run into an internal error — this is the only cause the manuals name for this fault.
What to check
- Replace the power unit.
- If required, upgrade the firmware in the power unit.
- If the fault cannot be cleared this way, contact Technical Support.
For the G120C the instruction manual condenses the remedy to two options: replace the converter, or contact technical support.
Reading the message value
- The drive stores the fault value in r0949, to be read as a decimal number.
- About this value the manual states:
Only for internal Siemens troubleshooting.
No decoding is given, so it does not point to any component or check.
Parameters the manual names
- r0949 — fault value: for F30850 the drive writes the error here in decimal form; the manual reserves it for internal Siemens diagnosis, so there is nothing for the technician to evaluate on site.
Acknowledging and restarting
This fault can only be acknowledged by switching the drive's power supply off and on again (POWER ON). Once the supply has been cycled, the drive can be restarted.
What differs between the drive families
Straight from the manuals' own fields — F30850 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | Infeed: OFF1 (NONE, OFF2) Servo: OFF1 (NONE, OFF2, OFF3) Vector: OFF1 (NONE, OFF2, OFF3) Hla: OFF1 (NONE, OFF2, OFF3) | POWER ON | Hardware/software error (1) | Power Module | SINAMICS S120, S150 List Manual · p. 3018 |
| G130, G150 | Vector: OFF1 (NONE, OFF2, OFF3) Infeed: OFF1 (NONE, OFF2) | POWER ON | Hardware/software error (1) | Power Module | SINAMICS G130, G150 List Manual · p. 1709 |
| G120 | OFF1 (NONE, OFF2, OFF3) | POWER ON | Hardware/software error (1) | — | SINAMICS G120 · p. 932 |
| G120XA | OFF1 (NONE, OFF2, OFF3) | POWER ON | — | — | SINAMICS G120XA PN converter · p. 1166 |
| G120C | — | — | — | — | SINAMICS G120C Converters · p. 387 |
| G115D | — | — | — | — | SINAMICS G115D distributed drive · p. 396 |
The drives this code lives on
F30850 is described for G115D, G120, G120C, G120XA, G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does F30850 mean on a SINAMICS drive?
It reports an internal software error inside the power unit. The only cause named in the manuals is this software error; no wiring, motor or parameter cause is given.
How do I acknowledge and clear F30850?
Only with a POWER ON acknowledgement: switch the drive's power supply off and on again. After the power cycle the drive can be restarted.
What is the fix for F30850?
Replace the power unit and, if required, upgrade its firmware; if that does not clear the fault, contact Technical Support. For the G120C the manual simply says to replace the converter or contact technical support.
What does the fault value of F30850 in r0949 tell me?
Nothing actionable on site: it is a decimal value that the manual reserves for internal Siemens troubleshooting, and no decoding is provided.
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