What it means
A49921 reports that the protective breaker in the main circuit for the redundant feed to the power supply has tripped. The message is output via the signal source of binector input p6577[2] of the Control Unit. Depending on the drive configuration, the same condition can also be issued as a fault (F) rather than as an alarm.
Why it appears
- The protective breaker in the main circuit of the redundant feed to the power supply has tripped.
What to check
- Check the redundant main circuit.
Parameters the manual names
- p6577 (BI: Circuit monitoring functions signal source) — signal source of the circuit monitoring functions; A49921 is output via the signal source of binector input p6577[2] of the Control Unit.
Acknowledging and restarting
As an alarm, A49921 needs no acknowledgement and triggers no automatic drive reaction. If the drive configuration issues the same condition as fault F, the manual gives OFF1 as the reaction for the infeed, for the servo and vector drive objects and for HLA, with NONE, OFF1_DELAYED, OFF2 and OFF3 named as the alternative reactions for these drive objects. The remedy is the same in both cases: check the redundant main circuit.
The same on every family
Every manual that describes A49921 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. 3292 |
The drives this code lives on
A49921 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A49921 mean on a SINAMICS drive?
The protective breaker in the main circuit for the redundant feed to the power supply has tripped. The message is output via the signal source of binector input p6577[2] of the Control Unit.
Does A49921 need to be acknowledged?
No — as an alarm it needs no acknowledgement and triggers no automatic drive reaction. If the condition is issued as fault F instead, the manual gives OFF1 as the reaction for the infeed, servo and vector drive objects and for HLA.
How do I clear A49921?
The remedy is to check the redundant main circuit, in which the protective breaker for the redundant feed to the power supply has tripped.
Which parameter is associated with A49921?
p6577, the binector input for the circuit monitoring functions signal source — the message is issued via the signal source of p6577[2] of the Control Unit.
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