What it means
A07409 signals that the current limiting controller of the U/f control has become active because the set current limit was exceeded. The drive reports this as an alarm and keeps running — no automatic trip is triggered. Depending on the drive configuration, the same condition can also be output without any drive reaction at all.
Why it appears
- The set current limit was exceeded, so the current limiting controller of the U/f control was activated.
What to check
- Increase the current limit (p0640) so the limiting controller no longer engages.
- Reduce the load.
- Slow down the ramp up to the setpoint speed.
Parameters the manual names
- p0640 — current limit: raise the limit here if the drive should be allowed more current before the current limiting controller of the U/f control engages.
Acknowledging and restarting
No acknowledgement is required. The alarm is withdrawn automatically after one of the measures above takes effect — the current limit (p0640) has been raised, the load reduced, or the ramp up to the setpoint speed slowed down.
What differs between the drive families
Straight from the manuals' own fields — A07409 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| G130, G150 | NONE | NONE | Application/technological function faulted (17) | None | SINAMICS G130, G150 List Manual · p. 1546 |
| S120, S150 | NONE | — | Application/technological function faulted (17) | None | SINAMICS S120, S150 List Manual · p. 2801 |
| G120 | NONE | NONE | Application/technological function faulted (17) | — | SINAMICS G120 · p. 877 |
| G120XA | NONE | NONE | — | — | SINAMICS G120XA PN converter · p. 1128 |
| G115D | — | — | — | — | SINAMICS G115D distributed drive · p. 393 |
| G120C | — | — | — | — | SINAMICS G120C Converters · p. 384 |
The drives this code lives on
A07409 is described for G115D, G120, G120C, G120XA, G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A07409 mean on a SINAMICS drive?
The current limiting controller of the U/f control has become active because the set current limit was exceeded. The drive reports this as an alarm without tripping.
How do I clear A07409?
No acknowledgement is needed — the alarm disappears by itself once you increase the current limit (p0640), reduce the load, or slow down the ramp up to the setpoint speed.
Which parameter is behind A07409?
p0640, the current limit. Raising it gives the drive more current headroom before the current limiting controller of the U/f control activates.
Why does the drive keep running with A07409?
A07409 is an alarm, not a fault: no automatic trip is triggered, and depending on the configuration the same condition can even be output with no drive reaction at all.
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 A07xxx group · SINAMICS manuals · Siemens manuals