What it means
A07541 is raised when the selected drive data set changeover together with the assigned motor changeover is not possible and is therefore not carried out. The manuals describe the alarm identically for SINAMICS G130, G150, S120 and S150, and they name one condition that blocks the changeover: for a synchronous motor, the motor contactor may only be switched at actual speeds below the speed at the start of field weakening (r0063 < p0348). If the changeover is commanded while the actual speed is not below this threshold, the drive rejects the changeover and shows A07541.
Why it appears
- The selected drive data set changeover and the assigned motor changeover are not possible, so the drive does not carry them out.
- For synchronous motors, the motor contactor may only be switched at actual speeds below the speed at the start of field weakening (r0063 < p0348).
What to check
- Read the smoothed actual velocity in r0063 and compare it with the speed at the start of field weakening in p0348.
- Reduce the speed to below the speed at the start of field weakening, so that r0063 < p0348.
Parameters the manual names
- r0063 (CO: actual velocity, smoothed) — read this value to check whether the actual speed is already below the threshold the changeover needs.
- p0348 — the speed at the start of field weakening; it is the value the actual speed r0063 has to fall below before the motor contactor of a synchronous motor may be switched.
Acknowledging and restarting
The alarm does not have to be acknowledged and does not trip the drive. The rejected changeover is simply not carried out, so the drive stays with the data sets that were active. Reduce the speed to below the field-weakening entry speed (r0063 < p0348); the changeover can then be issued again.
The same on every family
Every manual that describes A07541 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Application/technological function faulted (17) | None | SINAMICS S120, S150 List Manual · p. 2841 |
| G130, G150 | NONE | NONE | Application/technological function faulted (17) | None | SINAMICS G130, G150 List Manual · p. 1576 |
The drives this code lives on
A07541 is described for G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does SINAMICS alarm A07541 mean?
It means the selected drive data set changeover and the assigned motor changeover are not possible and are not carried out. For a synchronous motor, the motor contactor may only be switched while the actual speed is below the speed at the start of field weakening (r0063 < p0348).
How do I fix alarm A07541?
Reduce the speed to below the speed at the start of field weakening, so that the smoothed actual velocity r0063 is less than p0348. The changeover can then be issued again.
Does A07541 have to be acknowledged?
No. The alarm requires no acknowledgement and does not trip the drive; the attempted changeover is simply not carried out.
Which SINAMICS drives report A07541?
The alarm is described for SINAMICS G130, G150, S120 and S150, with the same meaning and the same remedy on all of them.
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 A07xxx group · SINAMICS manuals · Siemens manuals