What it means
F01255 is raised by the Control Unit when an error occurs while reading the read-only data of the EEPROM in the Option Board. The manuals for the G130, G150, S120 and S150 describe the fault identically, so the same cause and the same two remedial steps apply on each of these families.
Why it appears
- An error occurred when reading the read-only data of the EEPROM in the Option Board.
What to check
- Carry out a POWER ON — switch the drive off and then switch it on again.
- If the fault occurs again after switching on, replace the Control Unit.
Reading the message value
- The drive stores the fault value in r0949; interpret the value as a decimal number.
- According to the manual, the value is
Only for internal Siemens troubleshooting
— no decoding of the value is published for service staff.
Parameters the manual names
- r0949 (fault value) — holds the fault value belonging to F01255; read it as a decimal number, although the manual notes the value is only for internal Siemens troubleshooting.
Acknowledging and restarting
This fault is acknowledged by a POWER ON: switch the drive off and then switch it on again. If the fault is displayed again after switching on, the Control Unit must be replaced.
The same on every family
Every manual that describes F01255 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE (OFF2) | POWER ON | Hardware/software error (1) | None | SINAMICS S120, S150 List Manual · p. 2585 |
| G130, G150 | NONE (OFF2) | POWER ON | Hardware/software error (1) | None | SINAMICS G130, G150 List Manual · p. 1397 |
The drives this code lives on
F01255 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 F01255 mean on a SINAMICS drive?
It means the Control Unit detected an error while reading the read-only data of the EEPROM in the Option Board.
How do I clear fault F01255?
Carry out a POWER ON: switch the drive off and switch it on again. If the fault appears again after switching on, replace the Control Unit.
What does the fault value of F01255 in r0949 tell me?
The value in r0949 is interpreted as a decimal number, but the manual states it is only for internal Siemens troubleshooting, so no decoding is published for the technician.
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 F01xxx group · SINAMICS manuals · Siemens manuals