What it means
A07971 is an alarm that reports the automatic determination of the angular commutation offset — the encoder adjustment — is switched on. The drive object types differ slightly: on SERVO drive objects the determination is activated with p1990 = 1, on VECTOR drive objects with p1990 = 1 or 3. The automatic determination is carried out at the next switch-on command.
Depending on the drive configuration, this condition can also be output without a reaction (N). No remedy is necessary — the alarm clears itself once the determination has run.
Why it appears
- The automatic determination of the angular commutation offset (encoder adjustment) is activated: with p1990 = 1 on SERVO drive objects and with p1990 = 1 or 3 on VECTOR drive objects.
- SERVO drive objects only: if fault F07414 is present and a pole position identification technique is set in p1980, the drive activates the determination itself (p1990 = 1) — the value was not necessarily entered by you.
What to check
- Look at p1990: 1 on SERVO, or 1 or 3 on VECTOR, means the determination will run at the next switch-on command.
- If the determination is intended, give the switch-on command and let it run; the alarm is withdrawn automatically after a successful determination.
- If the determination is not intended, set p1990 = 0 — this also withdraws the alarm.
- On SERVO with fault F07414 present, check p1980: a pole position identification technique set there is what switched the determination on.
Parameters the manual names
- p1990 — Encoder adjustment determine angular commutation offset: the switch behind this alarm. 1 (SERVO) or 1 or 3 (VECTOR) activates the automatic determination; 0 withdraws the alarm without the determination running.
- p1980 — PolID technique: on SERVO with fault F07414 present, the technique set here is what makes the drive set p1990 = 1 by itself and raise this alarm.
Acknowledging and restarting
Nothing has to be acknowledged. The alarm withdraws itself after the determination has completed successfully, or immediately when p1990 is set to 0. In the variant without reaction (N) it likewise requires no acknowledgement.
The same on every family
Every manual that describes A07971 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. 2898 |
| S120, S150 | NONE | NONE | Error in the parameterization / configuration / commissioning procedure (18) | None | SINAMICS S120, S150 List Manual · p. 2898 |
| G130, G150 | NONE | NONE | Error in the parameterization / configuration / commissioning procedure (18) | None | SINAMICS G130, G150 List Manual · p. 1624 |
The drives this code lives on
A07971 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 A07971 on a SINAMICS mean?
It reports that the automatic determination of the angular commutation offset (encoder adjustment) is activated — p1990 = 1 on SERVO, p1990 = 1 or 3 on VECTOR drive objects. The determination itself runs at the next switch-on command.
How do I clear or acknowledge A07971?
No acknowledgement is needed. The alarm disappears automatically after a successful determination, or as soon as p1990 is set back to 0.
Why is A07971 active although I never set p1990?
On SERVO drive objects with fault F07414 present, the drive activates the determination itself (p1990 = 1) when a pole position identification technique is set in p1980.
Is A07971 a fault or an alarm?
It is an alarm and, depending on the drive configuration, can also be output without a reaction (N). No remedy is necessary; the message clears itself.
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