What it means
A07454 is raised when the position actual value preprocessing (LR) does not have a valid encoder available. The preprocessing can only work if an encoder is assigned to it and that encoder points to an encoder data set (EDS) that actually contains encoder data. If one of these links is missing or empty, the drive signals this alarm.
Why it appears
- No encoder is assigned to the position actual value preprocessing (p2502 = 0).
- An encoder is assigned, but no encoder data set: p0187 = 99 or p0188 = 99 or p0189 = 99.
- An encoder and an encoder data set are assigned, but the encoder data set contains no encoder data (p0400 = 0) or invalid data — the manual names p0408 = 0 as an example.
What to check
- Check the drive data sets and the encoder assignment of the position actual value preprocessing: p2502 = 0 means that no encoder is assigned.
- Check the encoder data set numbers p0187 (encoder 1), p0188 (encoder 2) and p0189 (encoder 3); the value 99 means that the encoder in question has no encoder data set assigned.
- Check the content of the assigned encoder data sets: p0400 = 0 means that the data set holds no encoder data at all, and values such as the rotary encoder pulse number p0408 = 0 count as invalid data.
Parameters the manual names
- p2502 — LR encoder assignment: check here whether an encoder is assigned to the position actual value preprocessing; p2502 = 0 is the first possible cause of this alarm.
- p0187 — encoder 1 encoder data set number: the value 99 means that encoder 1 has no encoder data set.
- p0188 — encoder 2 encoder data set number: the value 99 means that encoder 2 has no encoder data set.
- p0189 — encoder 3 encoder data set number: the value 99 means that encoder 3 has no encoder data set.
- p0400 — encoder type selection: the value 0 means that the assigned encoder data set does not contain any encoder data.
- p0408 — rotary encoder pulse number: named in the manual as an example of invalid encoder data when it is 0.
Acknowledging and restarting
This alarm does not have to be acknowledged. Correct the drive data sets, the encoder data sets and the encoder assignment so that the position actual value preprocessing again has a valid encoder; once the configuration is valid, the alarm goes away by itself.
The same on every family
Every manual that describes A07454 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Error in the parameterization / configuration / commissioning procedure (18) | None | SINAMICS S120, S150 List Manual · p. 2820 |
| G130, G150 | NONE | NONE | Error in the parameterization / configuration / commissioning procedure (18) | None | SINAMICS G130, G150 List Manual · p. 1557 |
The drives this code lives on
A07454 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 A07454 mean on a SINAMICS drive?
The position actual value preprocessing (LR) has no valid encoder: either no encoder is assigned (p2502 = 0), the assigned encoder has no encoder data set (p0187 = 99, p0188 = 99 or p0189 = 99), or the encoder data set contains no encoder data (p0400 = 0) or invalid data such as p0408 = 0.
How do I fix A07454?
Check the drive data sets, the encoder data sets and the encoder assignment using p2502, p0187, p0188, p0189, p0400 and p0408. Once the position actual value preprocessing again has a valid encoder, the alarm disappears.
Does A07454 have to be acknowledged?
No. It is an alarm without an acknowledgment requirement; correcting the encoder assignment and the encoder data sets removes it by itself.
Why does A07454 appear although an encoder is assigned?
Because the encoder data set behind it is empty or invalid: p0400 = 0 means the data set contains no encoder data, and the manual gives p0408 = 0 (rotary encoder pulse number) as an example of invalid data.
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