What it means
A07576 reports that the drive is running without encoder feedback because a fault is active: the signal 'encoderless operation active due to a fault' is set (r1407.13 = 1). This state is not a separate malfunction. Because the motor encoder fault response in p0491 is set to ENCODER, an active fault makes the drive continue to operate encoderless, and this alarm marks that state.
Why it appears
- Encoderless operation is active because a fault is present (r1407.13 = 1).
- The drive behaves this way because the behavior for faults has been set to the ENCODER fault response in p0491: while the fault is active, the drive keeps running without encoder feedback.
What to check
- Remove the cause of the possible encoder fault.
- Carry out a POWER ON (switch-off/switch-on) for all components.
Parameters the manual names
- p0491 (Motor encoder fault response): the setting behind this alarm — it is set to ENCODER, so an active fault results in encoderless operation. It is the parameter to look at to understand why A07576 is being raised.
Acknowledging and restarting
This alarm needs no acknowledgement, and the drive takes no automatic reaction to it. To end the encoderless operation, remove the cause of the encoder fault and then carry out a POWER ON (switch-off/switch-on) for all components.
The same on every family
Every manual that describes A07576 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Actual position/speed value incorrect or not available (11) | None | SINAMICS S120, S150 List Manual · p. 2850 |
| G130, G150 | NONE | NONE | Actual position/speed value incorrect or not available (11) | None | SINAMICS G130, G150 List Manual · p. 1584 |
The drives this code lives on
A07576 is described for G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A07576 mean?
It reports that encoderless operation is active because a fault is present (r1407.13 = 1). The drive keeps running without encoder feedback while the fault is active.
How do I clear A07576?
Remove the cause of the possible encoder fault, then carry out a POWER ON (switch-off/switch-on) for all components.
Does A07576 stop the drive or need an acknowledgement?
No. The alarm causes no automatic reaction and no acknowledgement is required. The encoderless operation ends when the cause of the encoder fault has been removed and the POWER ON has been carried out.
Which parameter is behind A07576?
p0491, the motor encoder fault response. It is set to ENCODER, which is why an active fault results in encoderless operation.
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