What it means
A30057 is the power unit's alarm for line asymmetry: frequencies have been detected on the DC link voltage that suggest the line supply is asymmetric or that a line phase has failed. It is also possible that a motor phase has failed. If the alarm remains present, the drive outputs fault F30011 — at the latest after 5 minutes. The precise duration depends on the power unit type and the particular frequencies; for booksize and chassis power units it also depends on how long the alarm has been active.
Why it appears
- The power unit has detected frequencies on the DC link voltage that would suggest line asymmetry or failure of a line phase.
- A motor phase may also have failed.
- If there is no phase failure of the line or the motor, then line asymmetry is involved.
What to check
- Check the line phase connection.
- Check the motor feeder cable connections. If there is no phase failure of the line or the motor, the condition is line asymmetry.
- Reduce the power so that fault F30011 is not output.
Reading the message value
- The drive places an alarm value in r2124; the manual states that it is to be interpreted as a decimal number.
- No decoding is given: according to the manual, this value serves only internal Siemens troubleshooting.
Parameters the manual names
- r2124 — alarm value of this message, read as a decimal number; the manual gives no on-site decoding because it is reserved for internal Siemens troubleshooting.
Acknowledging and restarting
No acknowledgement is required for this alarm. If it remains present, the drive outputs fault F30011 at the latest after 5 minutes.
What differs between the drive families
Straight from the manuals' own fields — A30057 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Network fault (2) | Power Module | SINAMICS S120, S150 List Manual · p. 2960 |
| G130, G150 | NONE | NONE | Network fault (2) | Power Module | SINAMICS G130, G150 List Manual · p. 1668 |
| G120 | NONE | NONE | Network fault (2) | — | SINAMICS G120 · p. 916 |
| G120XA | NONE | NONE | — | — | SINAMICS G120XA PN converter · p. 1161 |
The drives this code lives on
A30057 is described for G120, G120XA, G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A30057 mean on a SINAMICS drive?
The power unit has detected frequencies on the DC link voltage that suggest line asymmetry or failure of a line phase; a failed motor phase is also possible.
Why does A30057 turn into fault F30011?
Fault F30011 is output if the alarm is present, and at the latest after 5 minutes. The precise duration depends on the power unit type and the particular frequencies, and for booksize and chassis power units also on how long the alarm has been active.
How do I clear alarm A30057?
Check the line phase connection and the motor feeder cable connections. If there is no phase failure of the line or the motor, line asymmetry is involved, and the power should be reduced to avoid fault F30011.
Does A30057 have to be acknowledged?
No acknowledgement is required, and the drive takes no automatic reaction either. The important step is to check the line and motor connections and reduce the power before fault F30011 appears.
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 A30xxx group · SINAMICS manuals · Siemens manuals