What it means
F07406 reports that the maximum buffer time of the Vdc-min controller (kinetic buffering) has been exceeded without the line supply having returned. The time threshold for this buffering is set in p1255, and in p1295 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 automatic reaction (N) instead of a fault.
Why it appears
- The maximum buffer time for the Vdc-min controller (kinetic buffering) has been exceeded without the line supply having returned. The buffer time applies as set in p1255, and as p1295 on vector drives with U/f control.
What to check
- Check the time threshold set for the Vdc-min controller (kinetic buffering): p1255, the Vdc_min controller time threshold.
- On vector drives with U/f control, also check p1295, the Vdc_min controller time threshold (U/f).
Parameters the manual names
- p1255 (Vdc_min controller time threshold, Vdc_min t_thr) — the maximum buffer time whose setting is checked when this fault occurs.
- p1295 (Vdc_min controller time threshold (U/f), Vdc_min t_thr) — the corresponding maximum buffer time checked on vector drives with U/f control.
Acknowledging and restarting
Acknowledge the fault immediately, for example at the operator panel or in the commissioning tool; the drive will not restart until the fault has been acknowledged. Where the drive is configured to output the condition only as an alarm (A) or with no reaction (N), neither a stop nor an acknowledgement is required.
What differs between the drive families
Straight from the manuals' own fields — F07406 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF3 (IASC/DCBRK, NONE, OFF1, OFF2, STOP2) | IMMEDIATELY | Application/technological function faulted (17) | None | SINAMICS S120, S150 List Manual · p. 2801 |
| G130, G150 | OFF3 (IASC/DCBRK, NONE, OFF1, OFF2, STOP2) | IMMEDIATELY | Application/technological function faulted (17) | None | SINAMICS G130, G150 List Manual · p. 1546 |
| G120 | OFF3 (IASC/DCBRK, NONE, OFF1, OFF2, STOP2) | IMMEDIATELY | Application/technological function faulted (17) | — | SINAMICS G120 · p. 877 |
The drives this code lives on
F07406 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 SINAMICS fault F07406 mean?
It means the maximum buffer time of the Vdc-min controller (kinetic buffering) has been exceeded without the line supply having returned. The buffer time is set in p1255, or in p1295 for vector drives with U/f control.
How do I fix fault F07406?
Check the time threshold for the Vdc-min controller (kinetic buffering) in p1255 and, on vector drives with U/f control, in p1295, then acknowledge the fault immediately.
Can F07406 appear as a warning instead of a fault?
Yes. Depending on the drive configuration, the same condition can also be output as an alarm (A) or with no reaction (N); in those variants no stop is triggered and no acknowledgement is required.
Which parameters belong to fault F07406?
p1255, the Vdc_min controller time threshold, and p1295, the same time threshold for vector drives with U/f control.
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