Siemens SINAMICS S120 Function Manual page 257

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For encoders, which provide an absolute position (r0404.1 = 1), determining the commutation

angle offset can be deactivated (p1990 = 0).

Pole position identification is only possible at standstill.

If the control mode is only changed over to operation with encoder (p1300 = 21) after the

automatic calculation (p3900 = 3 or p0340 = 3), then pole position identification must be

manually set (p1982 = 1); this assumes that an encoder that requires pole position identification

has been selected (e.g. an incremental encoder with zero mark). This is indicated by fault

Pole position correction when rotating (fine calibration of the encoder)

The accuracy of the determined commutation angle offset (p0431) can be increased using the

encoder fine calibration.

● The motor can be rotated without load.

To perform the pole position correction when rotating, proceed as follows:

1. Activate the encoder fine calibration (p1905 = 90).

Alarm A07976 with alarm value 1 is displayed.

2. Set the pulse enable and accelerate the motor (n > 40% rated speed)

3. Wait for the end of the measurement (alarm A07976 with alarm value 4, takes approximately

1 minute) and then switch off the drive.

The measurement is restarted if, during the measurement, an excessively low current flows

(alarm A07976 with alarm value 12) - or if the speed is too low (alarm A07976 with alarm

value 10), then the measurement is restarted.

4. After the pulse inhibit, the value is calculated and saved to parameter p0431 - assuming that

it had been successfully completed (alarm A07976 with alarm value 5).

0 is automatically written to p1905, and alarm A07976 disappears.

Drive functions

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

Vector control

6.14 Pole position identification