What it means
Alarm A49926 reports that a protective breaker for the synchronizing voltage has tripped. The signal reaches the Control Unit via the signal source of binector input p6577[13]. Depending on how the drive is configured, the same condition can also be issued as a fault rather than as an alarm.
Why it appears
- The protective breaker for the synchronizing voltage has tripped.
What to check
- Check the synchronizing voltage.
Parameters the manual names
- p6577 — BI: circuit monitoring functions signal source. The message is output via the signal source of binector input p6577[13] of the Control Unit, so this parameter points to the signal source behind the trip.
Acknowledging and restarting
As an alarm, A49926 needs no acknowledgement. If the drive's configuration issues the same condition as a fault instead, it must be acknowledged immediately, and the drive's response then depends on the drive object — from no automatic response to OFF1, OFF2 or OFF3.
The same on every family
Every manual that describes A49926 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. 3294 |
The drives this code lives on
A49926 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A49926 mean on a SINAMICS drive?
A protective breaker for the synchronizing voltage has tripped. The Control Unit receives the message via the signal source of binector input p6577[13].
How do I clear A49926?
Check the synchronizing voltage — the remedy names no other action. As an alarm the message needs no acknowledgement; if your configuration issues it as a fault, acknowledge immediately.
Does A49926 switch the drive off?
As an alarm, no — the drive takes no automatic action and no acknowledgement is needed. When the same condition is issued as a fault, the response depends on the drive object and ranges from no automatic response to OFF1, OFF2 or OFF3.
What is p6577 used for with A49926?
p6577 is the binector input (BI) signal source for the circuit monitoring functions. Index [13] of this signal source is where the Control Unit outputs the A49926 message.
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