What it means
F07993 is raised when either the direction of the rotating field or the sign of the encoder actual value is incorrect. The manual ties the fault to motor data identification: that routine automatically changed the actual value inversion (p0410) in order to correct the control sense, and this automatic change can itself result in a change of the direction of rotation. The drive coasts down (OFF2) when the fault appears and will only run again once the fault has been cleared.
Why it appears
- The direction of the rotating field or the encoder actual value has an incorrect sign.
- Motor data identification automatically changed the actual value inversion (p0410) in order to correct the control sense, and this can result in a direction of rotation change.
What to check
- Check the direction of rotation — also for the position controller, if one is being used.
- If the direction of rotation is correct: no additional measures are required, except to set p1910 = -2 and acknowledge the fault.
- If the direction of rotation is incorrect: to change the direction of rotation, two phases must be interchanged and the motor identification routine must be repeated.
- After the motor identification routine, confirm the corrected direction of rotation with p1910 = -2 and acknowledge the fault.
Parameters the manual names
- p0410 (Encoder inversion actual value / Enc inv ActV) — the actual value inversion that motor data identification changed automatically to correct the control sense; this automatic change is what raises the fault.
- p1910 (Valve offset calibration standstill activation / Valv_off_cal act) — set to -2 to acknowledge the correctness of the direction of rotation, which the drive requires before this fault can be acknowledged.
Acknowledging and restarting
Before the fault itself can be acknowledged, the drive requires the correctness of the direction of rotation to be confirmed first: To acknowledge this fault, the correctness of the direction of rotation must first be acknowledged with p1910 = -2.
If the direction of rotation was found to be incorrect, first interchange two phases and repeat the motor identification routine, then set p1910 = -2 and acknowledge the fault. If the direction of rotation is correct, no additional measures are needed apart from setting p1910 = -2 and acknowledging the fault, after which the drive can be restarted.
The same on every family
Every manual that describes F07993 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF2 (NONE) | — | Error in the parameterization / configuration / commissioning procedure (18) | None | SINAMICS S120, S150 List Manual · p. 2912 |
The drives this code lives on
F07993 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F07993 mean on SINAMICS S120 or S150?
It means that either the direction of the rotating field or the sign of the encoder actual value is incorrect. It is typically raised because motor data identification automatically changed the actual value inversion (p0410) to correct the control sense, which can change the direction of rotation.
How do I acknowledge and clear F07993?
Check the direction of rotation first, including the position controller if one is used. Then confirm the correctness of the direction of rotation with p1910 = -2 and acknowledge the fault.
Do I have to swap motor phases for F07993?
Only if the direction of rotation is actually incorrect. In that case two phases must be interchanged and the motor identification routine must be repeated; if the direction of rotation is correct, no additional measures are required besides p1910 = -2 and acknowledging the fault.
Why does the drive refuse to acknowledge F07993?
Because the acknowledgement is gated: the correctness of the direction of rotation must first be acknowledged with p1910 = -2 before the fault itself can be acknowledged.
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