Encoder Adjustment In Operation - Siemens Sinamics s120 Commissioning Manual

Commissioning
3.16 Commissioning permanent-magnet synchronous motors
3.16.1

Encoder adjustment in operation

This function can only be used for permanent-magnet synchronous motors operating in the
"vector control" mode. You can use this function to readjust encoders that have been
replaced in operation. The encoders can be adjusted within a motor line-up. The adjustment
is also possible when coupled to the load.
Adjusting a new encoder
1. After mounting the encoder, set p1990 = 3 to select a new adjustment.
– The encoder adjustment is automatically selected when switching on the next time.
2. Enable the pulses.
– The pole position identification determines the offset.
– If the zero mark position of the encoder is not known you are prompted to specify a
3. In this case, specify a setpoint.
– The drive then starts with the specified setpoint.
– The zero mark position of the encoder is determined.
– The pulse inhibit is set.
– The commutation angle offset is determined from the offset and position of the zero
– The commutation angle offset is written automatically to parameter p0431.
– p1990 = 0 is set automatically at the end of the adjustment and the result saved to the
The encoder module checks the consistency of the encoder pulses and zero mark. With this
technique, you can achieve an accuracy of approx. ±15° electrical. This accuracy is sufficient
for starting with maximum 95% rated torque. A fine calibration/adjustment is required for
higher starting torques.
If, after two motor revolutions, a zero mark has not been detected, the drive switches off with
fault F07970.
230
setpoint to start the drive.
mark.
RAM.
STARTER Commissioning Manual
Commissioning Manual, (IH1), 07/2016, 6SL3097-4AF00-0BP5