Using The Servo On Command To Perform Polarity Detection - YASKAWA SGD7S Product Manual

• The parameters must not be write prohibited. (This item applies only when using the Sig-
maWin+ or Digital Operator.)
• The test without a motor function must be disabled (Pn00C = n.0).
• There must be no overtravel.
• If the motor parameters have been written or the origin of the absolute linear encoder has
been set, the power supply to the SERVOPACK must be turned OFF and ON again after
completion of the writing or setting operation.
1. Power is supplied to the Servomotor during polarity detection. Be careful not to get an electric
shock. Also, the Moving Coil of the Linear Servomotor may greatly move during detection. Do
not approach the moving parts of the Servomotor.
Important
2. Polarity detection is affected by many factors.
For example, polarity detection may fail if the mass ratio or friction is too large or the cable ten-
sion is too strong.
5.9.2 Using the Servo ON Command to Perform Polarity
Detection
You can use the Servo ON command to perform polarity detection only with an incremental lin-
ear encoder.
Polarity detection will start simultaneously with execution of the Servo ON command. As soon
as polarity detection is completed, the /S-RDY (Servo Ready Output) signal will turn ON and
the servo will remain ON.
Servo ON command (Enable)
/S-RDY (Servo Ready Output) signal
0
Polarity detection in progress
→ Status display: P-dt
Power not supplied.
Power supplied.
Motor power status

5.9.2 Using the Servo ON Command to Perform Polarity Detection

1
OFF ON
Completion of polarity detection
→ Normal operation is enabled.
5.9 Polarity Detection
5
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