What it means
A07891 is an alarm from the drive's load monitoring. It is raised when the load monitoring is configured for a pump or a fan (p2193 = 4 or 5) and the function detects that the pump or fan is blocked. The manual adds a second possibility for the same message: the blocking torque threshold p2168 may simply be set too low for the application, for example with heavy duty starting.
Why it appears
- The load monitoring is configured for a pump or fan (p2193 = 4 or 5) and has detected that the pump or fan is blocked.
- The blocking torque threshold p2168 is set too low for the application — for example with heavy duty starting.
What to check
- Check whether the pump or fan is blocked, and if it is blocked, resolve the problem.
- Check that the fan can move freely, and if necessary resolve the problem.
- Adapt the parameterization to the load (p2165, p2168).
Parameters the manual names
- p2193 (load monitoring configuration): selects the monitored load type; this alarm belongs to the pump/fan configuration, i.e. p2193 = 4 or 5.
- p2168 (load monitoring stall monitoring torque threshold): the blocking torque threshold; if it is set too low for the load, adapt it to the application.
- p2165 (load monitoring stall monitoring upper threshold): the upper threshold of the stall monitoring; adapt it to the load together with p2168.
- p2181 (load monitoring response): the response of the load-monitoring function; the manual names it for this alarm together with p2165, p2168 and p2193.
Acknowledging and restarting
No acknowledgement is required for this alarm. Resolve the underlying condition: free the blocked pump or fan so that it can move freely again, and adapt p2165 and p2168 to the load if the threshold settings do not match the application.
What differs between the drive families
Straight from the manuals' own fields — A07891 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| G120 | NONE | NONE | Motor overload (8) | — | SINAMICS G120 · p. 884 |
| G120XA | — | NONE | — | — | SINAMICS G120XA PN converter · p. 1135 |
The drives this code lives on
A07891 is described for G120, G120XA. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A07891 mean on a SINAMICS converter?
The load monitoring, configured for a pump or fan with p2193 = 4 or 5, has detected that the pump or fan is blocked. A blocking torque threshold p2168 that is set too low is another possible trigger.
How do I clear alarm A07891?
No acknowledgement is required. Remove the blockage so the pump or fan can move freely again, and adapt p2165 and p2168 to the load if the thresholds are set too low.
Why does A07891 appear even though the pump is not blocked?
The manual names a blocking torque threshold p2168 set too low as a possible cause, for example with heavy duty starting. Adapting p2165 and p2168 to the load is part of the remedy.
Which parameters belong to alarm A07891?
p2193 (load monitoring configuration), p2168 (load monitoring stall monitoring torque threshold), p2165 (load monitoring stall monitoring upper threshold) and p2181 (load monitoring response).
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