What it means
A49933 reports that the protective breaker in the 230 V AC circuit of the excitation has tripped. The trip is reported to the Control Unit through the signal source of binector input p6577[17] — this is the point at which the circuit-monitoring function for this message is wired. The message is issued without a fault value. Depending on how the drive is configured, the same condition can also be raised as a fault (F49933) instead of an alarm.
Why it appears
- The protective breaker in the 230 V AC circuit of the excitation has tripped.
What to check
- Check the 230 V AC circuit of the excitation, including the protective breaker that has tripped there.
Parameters the manual names
- p6577 (BI: Circuit monitoring functions signal source, I_cct mon s_s) — the trip message for the excitation's 230 V AC circuit is fed in via p6577[17]; this is where the signal source of the circuit-monitoring function that reports the tripped protective breaker is entered.
Acknowledging and restarting
The only remedy the manual gives for this condition is to check the 230 V AC circuit of the excitation; no further restart steps are described. When the condition is present as a fault, the drive first executes the stop reaction listed for its drive object and must be acknowledged before it will start again — the acknowledgment can be made as soon as the cause has been removed.
The same on every family
Every manual that describes A49933 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | — | — | General drive fault (19) | None | SINAMICS S120, S150 List Manual · p. 3294 |
The drives this code lives on
A49933 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A49933 mean on a SINAMICS drive?
It reports that the protective breaker in the 230 V AC circuit of the excitation has tripped. The trip signal reaches the Control Unit via the signal source of binector input p6577[17].
How do I fix A49933?
Check the 230 V AC circuit of the excitation — that is the remedy the manual gives. Once the circuit is restored the condition is cleared; when it appears as a fault, the drive must be acknowledged before it will start again.
Can A49933 also appear as a fault?
Yes. Depending on the drive configuration, the same condition can also be raised as fault F49933; the reaction and acknowledgment per drive object are shown in the table on this page.
Which parameter is linked to A49933?
p6577, the signal source of the circuit-monitoring functions (BI: Circuit monitoring functions signal source). Index [17] carries the signal that outputs this 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