What it means
A01066 is an alarm that reports the fill level of the non-volatile buffer memory in which the drive holds parameter changes: that memory is filled to at least 70%. Besides simply filling up over time, the alarm can also appear when the buffer memory is active (p0014 = 1) and parameters are continually changed via a fieldbus system.
Why it appears
- The non-volatile buffer memory for parameter changes is filled to at least 70%.
- The alarm also occurs when the buffer memory is active (p0014 = 1) and parameters are continually changed via a fieldbus system.
What to check
- If required, deactivate and clear the buffer memory by setting p0014 = 0.
- If required, clear the buffer memory by setting p0014 = 2.
- The entries in the buffer memory are transferred into the ROM and the buffer memory is then cleared when you set p0971 = 1, or when you switch the Control Unit off and on again.
Parameters the manual names
- p0014 (Buffer memory mode) — the buffer memory switch for this alarm: 1 leaves the buffer active, which is the situation that raises A01066 while parameters are continually changed via a fieldbus system; 0 deactivates and clears the buffer; 2 clears it.
- p0971 (Save parameters / Save par) — set it to 1 to transfer the entries buffered so far into the ROM and clear the buffer memory.
Acknowledging and restarting
The alarm requires no acknowledgement. To resolve the reported condition, empty the buffer memory: set p0014 to 0 or to 2, or have the buffered entries transferred into the ROM — this happens when you set p0971 = 1 or switch the Control Unit off and on again — after which the buffer memory is cleared.
What differs between the drive families
Straight from the manuals' own fields — A01066 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| G120 | NONE | NONE | General drive fault (19) | — | SINAMICS G120 · p. 829 |
| G120XA | NONE | NONE | — | — | SINAMICS G120XA PN converter · p. 1106 |
The drives this code lives on
A01066 is described for G120, G120XA. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A01066 mean?
It reports that the non-volatile buffer memory for parameter changes is filled to at least 70%. This can also occur when the buffer memory is active (p0014 = 1) and parameters are continually changed via a fieldbus system.
How do I clear the buffer memory after A01066?
Set p0014 = 2 to clear the buffer memory, or p0014 = 0 to deactivate and clear it. Its entries are transferred into the ROM and the buffer is then cleared when you set p0971 = 1 or switch the Control Unit off and on again.
Does A01066 have to be acknowledged?
No. The alarm requires no acknowledgement; it only reports the fill level of the parameter buffer.
Why does A01066 keep coming back?
Because the buffer memory is active (p0014 = 1) while parameters are continually changed via a fieldbus system, it fills up again. If required, deactivate and clear it with p0014 = 0.
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 A01xxx group · SINAMICS manuals · Siemens manuals