What it means
Alarm A49922 reports that a protective breaker in the 24 V circuit has tripped. The Control Unit receives the condition through the signal source of binector input p6577[3]; the manual therefore cross-references p6577 (circuit monitoring functions signal source). Depending on how the drive is configured, the same protective-breaker condition is also issued as a fault (F) instead of an alarm.
Why it appears
- A protective breaker in the 24 V circuit has tripped; the condition is fed to the Control Unit via the signal source interconnected at binector input p6577[3].
What to check
- Check the 24 V circuit in which the protective breaker has tripped — this is the remedy the manual gives for the message.
- Check the signal source interconnected at p6577[3] (circuit monitoring functions signal source), since the Control Unit outputs this message from that binector input.
Parameters the manual names
- p6577 — BI: Circuit monitoring functions signal source: the signal source via which the Control Unit outputs this message; for this code the manual points to index [3] of the binector input.
Acknowledging and restarting
While the condition is present as alarm A49922, no acknowledgement is required. If the drive configuration raises the same condition as a fault (F) instead, the manual lists OFF1 as the reaction upon F for the affected drive objects and requires the fault to be acknowledged IMMEDIATELY; once the 24 V circuit is intact again and the fault has been acknowledged, the drive objects can be started again.
The same on every family
Every manual that describes A49922 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | General drive fault (19) | None | SINAMICS S120, S150 List Manual · p. 3293 |
The drives this code lives on
A49922 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does SINAMICS alarm A49922 mean?
It reports that a protective breaker in the 24 V circuit has tripped. The message is output via the signal source of binector input p6577[3] of the Control Unit.
How is alarm A49922 reset or acknowledged?
As an alarm it needs no acknowledgement. If the drive configuration issues the same condition as a fault (F), it must be acknowledged IMMEDIATELY.
What should I check when A49922 appears?
Check the 24 V circuit whose protective breaker has tripped, and verify the signal source interconnected at p6577[3] (circuit monitoring functions signal source).
Does A49922 stop the drive?
The alarm itself does not switch the drive objects off. When the condition is raised as a fault, the manual lists OFF1 as the reaction upon F, so the affected drive objects are stopped and run again only after the IMMEDIATELY acknowledgement.
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 A49xxx group · SINAMICS manuals · Siemens manuals