What it means
F07429 is raised when the DSC (Dynamic Servo Control) function has been activated although there is no encoder for the drive. DSC needs encoder feedback to work, so the setting is contradictory: the function is switched on, but no encoder is selected. The code points to the drive's configuration, not to a hardware fault that occurred at runtime.
Why it appears
- The DSC (Dynamic Servo Control) function was activated although there is no encoder.
What to check
- Check the encoder selection configuration in p1192 and make sure it matches the encoder actually present on the drive.
- If there is no encoder and connector input p1191 (DSC position controller gain) is interconnected, then connector input p1191 must have a 0 signal.
Parameters the manual names
- p1192 (DSC encoder selection): the parameter to check and correct for this fault, so the encoder selection matches whether an encoder is actually connected.
- p1191 (CI: DSC position controller gain KPC): connector input for the DSC gain — if the drive has no encoder and this input is interconnected, it must be given a 0 signal.
Acknowledging and restarting
The drive reacts with OFF2: it coasts down and must be acknowledged before it will start. For this code the acknowledgement requires POWER ON — switch off the drive's power supply and switch it on again. Correct the encoder selection in p1192 first, because the drive will raise the code again as long as DSC stays active without an encoder.
The same on every family
Every manual that describes F07429 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF2 | IMMEDIATELY (POWER ON) | Error in the parameterization / configuration / commissioning procedure (18) | None | SINAMICS S120, S150 List Manual · p. 2812 |
The drives this code lives on
F07429 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F07429 mean on SINAMICS?
The drive reports that the DSC (Dynamic Servo Control) function has been activated although no encoder is configured for the drive. The configuration must be corrected before the drive will run.
How do I fix fault F07429?
Check the encoder selection configuration in p1192; and if there is no encoder and connector input p1191 is interconnected, make sure p1191 has a 0 signal. Then acknowledge the fault with POWER ON, i.e. switch the drive's power supply off and on again.
Which parameters are relevant for F07429?
p1192 (DSC encoder selection) is the parameter to check. p1191 (CI: DSC position controller gain KPC) matters when no encoder is present and that connector input is interconnected — it must then carry a 0 signal.
Why does F07429 come back after I reset the drive?
Because the underlying configuration is still wrong: DSC remains activated without an encoder. Correct the encoder selection in p1192 first, then acknowledge with POWER ON.
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 F07xxx group · SINAMICS manuals · Siemens manuals