What it means
F01257 is raised when the firmware on the Control Unit (CU) is too old for the hardware it is supposed to operate: the firmware being used does not support the connected component. Which component is unsupported — the Control Unit itself or, in one case, the Power Module — is encoded in the fault value that the drive stores in r0949. The manuals for the families that describe this code give the same cause and the same remedy, so the interpretation below applies regardless of which converter shows the fault.
Why it appears
- The Control Unit firmware is too old: the firmware being used does not support the connected component — the Control Unit itself, or for fault value 3 the Power Module.
What to check
- Read the fault value in r0949 and interpret it hexadecimal (see the decoding below) to identify the unsupported component.
- Fault value 1, 2 or 4: upgrade the firmware of the Control Unit.
- Fault value 3: upgrade the firmware of the Control Unit and replace the Power Module by a component that is supported.
Reading the message value
- The drive stores the fault value in r0949; interpret it hexadecimal as bbbbbb aa, where the low byte aa names the unsupported component.
- aa = 01 hex = 1 dec: The firmware being used does not support the Control Unit.
- aa = 02 hex = 2 dec: The firmware being used does not support the Control Unit.
- aa = 03 hex = 3 dec: The firmware being used does not support the Power Module.
- aa = 04 hex = 4 dec: The firmware being used does not support the Control Unit.
Parameters the manual names
- r0949 — fault value: read it hexadecimal; the low byte (aa) tells you which component the firmware does not support and therefore which of the remedies above applies.
Acknowledging and restarting
While F01257 is active the drive coasts down and it is acknowledged only by POWER ON: the power supply must be switched off and on again before the drive will restart. Rectify the cause first — upgrade the Control Unit firmware, and with fault value 3 also replace the Power Module by a supported component — then power the drive down and up again so that it starts with firmware matching the connected hardware.
What differs between the drive families
Straight from the manuals' own fields — F01257 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| G120 | OFF2 | POWER ON | Error in the parameterization / configuration / commissioning procedure (18) | — | SINAMICS G120 · p. 832 |
| G120XA | OFF2 | POWER ON | — | — | SINAMICS G120XA PN converter · p. 1110 |
The drives this code lives on
F01257 is described for G120, G120XA. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does SINAMICS fault F01257 mean?
The Control Unit firmware is too old: the firmware being used does not support the connected component. The fault value in r0949 shows whether the unsupported component is the Control Unit or the Power Module.
How do I fix F01257?
Upgrade the firmware of the Control Unit; this is the remedy for fault values 1, 2 and 4. For fault value 3 the manual additionally requires replacing the Power Module by a component that is supported.
What is the fault value of F01257 telling me?
r0949 holds the value in hexadecimal as bbbbbb aa, where the low byte aa identifies the unsupported component: 01, 02 and 04 stand for the Control Unit, 03 for the Power Module.
Why can I not acknowledge F01257 from the panel?
The manuals specify POWER ON as the acknowledgement for this fault, so the power supply must be switched off and on again before the drive restarts. If the outdated firmware — or, with fault value 3, the unsupported Power Module — has not been rectified first, the condition is still present after the restart.
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