What it means
A07920 — Drive: Torque/speed too low is generated by the drive's load monitoring: the monitored torque or speed stays below the value the monitoring expects. What is compared depends on the load monitoring configuration in p2193. With p2193 = 1 the torque is checked against the torque/speed envelope characteristic; with p2193 = 2 the speed signal of the external encoder (refer to p3230) is checked against the smoothed actual speed r2169. The manuals print this cause with different depth for the individual drive objects — from the envelope deviation alone up to the additional encoder-based comparison.
Why it appears
- With p2193 = 1: the torque deviates from the torque/speed envelope characteristic — it is too low.
- With p2193 = 2: the speed signal from the external encoder (refer to p3230) deviates from the speed r2169 — it is too low.
What to check
- Check the connection between the motor and the load.
- Adapt the parameterization so that it corresponds to the driven load; the manual cross-references the load monitoring response p2181 for this alarm.
Parameters the manual names
- p2193 — load monitoring configuration: decides which comparison triggers this alarm, p2193 = 1 the torque envelope, p2193 = 2 the encoder speed against r2169.
- p3230 — CI: load monitoring speed actual value: the signal reference for the speed the monitoring evaluates; the encoder-based cause points directly to this parameter.
- r2169 — CO: actual speed smoothed signals: the drive-internal actual speed with which the external encoder speed is compared when p2193 = 2.
- p2181 — load monitoring response: the response of the load monitoring; the manual names it as a cross-reference to work through when adapting the parameterization.
Acknowledging and restarting
No acknowledgement is required for this alarm, and the drive itself does not intervene. The reset consists of removing the condition: a sound connection between motor and load and a load monitoring parameterization that matches the driven load.
What differs between the drive families
Straight from the manuals' own fields — A07920 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| G120 | NONE | NONE | Application/technological function faulted (17) | — | SINAMICS G120 · p. 887 |
| G120XA | — | NONE | — | — | SINAMICS G120XA PN converter · p. 1138 |
| S120, S150 | NONE | NONE | Application/technological function faulted (17) | Motor | SINAMICS S120, S150 List Manual · p. 2882 |
| G130, G150 | NONE | NONE | Application/technological function faulted (17) | Motor | SINAMICS G130, G150 List Manual · p. 1611 |
| G115D | — | — | — | — | SINAMICS G115D distributed drive · p. 394 |
| G120C | — | — | — | — | SINAMICS G120C Converters · p. 385 |
The drives this code lives on
A07920 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 A07920 mean on a SINAMICS drive?
The load monitoring reports a torque or speed that is too low. With p2193 = 1 the torque lies below the torque/speed envelope characteristic; with p2193 = 2 the external encoder speed lies below the smoothed actual speed r2169.
How do I acknowledge A07920?
No acknowledgement is required and the drive takes no protective action. Remove the cause — check the connection between motor and load and adapt the load monitoring parameterization to the actual load.
Why does my drive report torque/speed too low?
Because the monitored torque or the encoder speed stays below the expected envelope. The manual's remedy points to the motor–load connection or to a parameterization that does not correspond to the load.
Which parameters belong to alarm A07920?
p2193 selects the monitoring mode and p2181 defines its response. With p2193 = 2, p3230 carries the external encoder speed that is compared with r2169.
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