What it means
A07942 is the alarm Sync-line-drive: Setpoint frequency is completely different than the target frequency
. The drive raises it when the setpoint frequency and the target frequency of the sync-line-drive function differ considerably (f_set <> f_target). How large a difference is still tolerated is set in p3806. This is an alarm, not a fault: the drive takes no automatic action, and the message does not have to be acknowledged.
Why it appears
- The setpoint frequency and the target frequency differ considerably (f_set <> f_target).
- The deviation that can be tolerated between the setpoint and target frequencies is set in p3806; the alarm stays present as long as the actual difference lies outside this threshold.
What to check
- No remedial action is necessary.
- The alarm is withdrawn automatically as soon as the difference between the setpoint and target frequencies has come back within the deviation that can be tolerated (p3806).
Parameters the manual names
- p3806 — sync-line-drive frequency difference threshold value (Sync f_diff thr): here the deviation between the setpoint frequency and the target frequency is set that is still tolerated; this alarm clears itself once the actual difference is within this value.
Acknowledging and restarting
No acknowledgement is required. The alarm withdraws itself automatically once the difference between the setpoint frequency and the target frequency is again within the deviation set in p3806; until then the message remains displayed.
The same on every family
Every manual that describes A07942 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. 2889 |
| G130, G150 | NONE | NONE | Application/technological function faulted (17) | None | SINAMICS G130, G150 List Manual · p. 1617 |
The drives this code lives on
A07942 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 A07942 mean?
It is the alarm 'Sync-line-drive: Setpoint frequency is completely different than the target frequency': the setpoint frequency f_set and the target frequency f_target differ considerably. How large a difference is still tolerated is set in p3806.
How do I acknowledge or reset A07942?
No acknowledgement is needed. The alarm is withdrawn automatically as soon as the difference between the setpoint and target frequencies is within the deviation set in p3806.
Why does A07942 stay active on my drive?
Because the setpoint frequency is still further away from the target frequency than the threshold in p3806 permits. The message clears by itself once the difference comes back within that threshold.
Does A07942 stop the drive?
No. The drive takes no automatic action for this alarm and it does not have to be acknowledged; it only reports the frequency difference.
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