YASKAWA E-7S SERVOPACK SGD7S Product Manual page 200

5.16 Setting the Origin of the Absolute Linear Encoder
5.16.3 Operating Procedure
7.
Turn the power supply to the SERVOPACK OFF and ON again.
8.
If you use a Linear Servomotor that does not have a polarity sensor, perform polarity
detection.
Refer to the following section for details on the polarity detection.
This concludes the procedure to set the origin of the absolute linear encoder.
5-52
5.9 Polarity Detection on page 5-24