What it means
F07405 is raised when kinetic buffering does not succeed: during kinetic buffering the speed fell below the minimum speed and the line supply did not return. The speed threshold compared here belongs to the Vdc_min controller — p1257, or p1297 for vector drives with U/f control. Depending on the drive configuration, the same condition can also be output as an alarm (A) or with no reaction (N).
Why it appears
- During kinetic buffering, the speed dropped below the minimum speed threshold — p1257, or p1297 for vector drives with U/f control — and the line supply did not come back.
What to check
- Check the speed threshold set for the Vdc_min controller (kinetic buffering) in p1257.
- For vector drives with U/f control, check the corresponding threshold in p1297.
Parameters the manual names
- p1257 — Vdc_min controller speed threshold (Vdc_min n_thr): the threshold setting to check when F07405 trips.
- p1297 — Vdc_min controller speed threshold (U/f) (Vdc_min n_thr): the equivalent threshold on vector drives with U/f control; check this setting for F07405 when U/f control is used.
Acknowledging and restarting
The drive coasts down and must be acknowledged before it will start again. Once the threshold settings (p1257, p1297) have been checked and the cause remedied, the fault can be acknowledged immediately.
What differs between the drive families
Straight from the manuals' own fields — F07405 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF2 (IASC/DCBRK, NONE, OFF1, OFF3, STOP2) | IMMEDIATELY | Application/technological function faulted (17) | None | SINAMICS S120, S150 List Manual · p. 2801 |
| G130, G150 | OFF2 (IASC/DCBRK, NONE, OFF1, OFF3, STOP2) | IMMEDIATELY | Application/technological function faulted (17) | None | SINAMICS G130, G150 List Manual · p. 1546 |
| G120 | OFF2 (IASC/DCBRK, NONE, OFF1, OFF3, STOP2) | IMMEDIATELY | Application/technological function faulted (17) | — | SINAMICS G120 · p. 877 |
The drives this code lives on
F07405 is described for G120, G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F07405 mean on a SINAMICS drive?
During kinetic buffering the speed fell below the minimum speed threshold — p1257, or p1297 for vector drives with U/f control — and the line supply did not return.
How do I clear fault F07405?
Check the speed threshold of the Vdc_min controller (kinetic buffering) in p1257 and, for vector drives with U/f control, in p1297. Once the cause is remedied, the fault can be acknowledged immediately.
Can F07405 also appear as an alarm?
Yes. Depending on the drive configuration, the same condition can also be output as an alarm (A) or with no reaction (N).
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