What it means
The manuals print this alarm as Sync-line-drive: Target frequency not permissible
. It belongs to the line-drive synchronization function and reports that the target frequency for the synchronization lies outside the permissible value range: it is either greater than the effective positive speed limit (r1084) or less than the effective negative speed limit (r1087). The alarm triggers no reaction and requires no acknowledgment; the condition no longer applies once the target frequency fulfills the conditions for line-drive synchronization.
Why it appears
- The target frequency is outside the permissible value range: it is greater than the positive speed limit f_max (r1084) or less than the negative speed limit f_min (r1087).
What to check
- Read the alarm value in r2124 as a decimal number: 1084 means the target frequency is above the positive speed limit, 1087 means it is below the negative speed limit.
- Look at the effective limits that apply to the drive: r1084 (positive) and r1087 (negative).
- Compare the target frequency used for the line-drive synchronization with the limit named by the alarm value.
- Correct the target frequency so that it is neither greater than the positive limit (r1084) nor less than the negative limit (r1087) — so that it fulfills the conditions for the target frequency for line-drive synchronization.
Reading the message value
- The alarm value is held in r2124 and must be interpreted as a decimal number.
- The message value of the alarm refers to a parameter (the manual shows
Parameter: %1
). - 1084: Target frequency greater than the positive speed limit, f_sync > f_max (r1084).
- 1087: Target frequency less than the negative speed limit, f_sync < f_min (r1087).
Parameters the manual names
- r2124 (alarm value): holds the number that identifies which condition raised the alarm; read it as a decimal — 1084 or 1087.
- r1084 (CO: Speed limit positive effective, n_limit pos eff): the effective positive speed limit; a target frequency above it gives the alarm value 1084.
- r1087 (CO: Speed limit negative effective, n_limit neg eff): the effective negative speed limit; a target frequency below it gives the alarm value 1087.
Acknowledging and restarting
Nothing has to be acknowledged for this alarm. The target frequency for line-drive synchronization must fulfill the permissible conditions: not greater than the positive speed limit (r1084) and not less than the negative speed limit (r1087).
What differs between the drive families
Straight from the manuals' own fields — A07941 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| G130, G150 | NONE | NONE | Application/technological function faulted (17) | None | SINAMICS G130, G150 List Manual · p. 1616 |
| S120, S150 | — | — | Application/technological function faulted (17) | None | SINAMICS S120, S150 List Manual · p. 2888 |
The drives this code lives on
A07941 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 alarm A07941 mean on a SINAMICS drive?
It reports that the target frequency for line-drive synchronization lies outside the permissible value range — above the effective positive speed limit (r1084) or below the effective negative speed limit (r1087).
How do I clear alarm A07941?
Read the alarm value in r2124 as a decimal number to see which limit is violated (1084 or 1087), then correct the target frequency so that it fulfills the conditions for line-drive synchronization. No acknowledgment is required.
Where is the alarm value of A07941 stored?
In r2124, interpreted as a decimal number: 1084 means the target frequency exceeds the positive limit f_max (r1084), 1087 means it is below the negative limit f_min (r1087).
Does alarm A07941 trip the drive?
No — the alarm triggers no reaction and needs no acknowledgment; it only reports that the target frequency is outside the effective speed limits.
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