Using The Sv_On (Servo On) Command To Perform Polarity Detection; Detection - YASKAWA SGD7S Product Manual

Preparations
Always check the following before you execute polarity detection.
• Not using a polarity sensor must be specified (Pn080 = n.1).
• The servo must be OFF.
• The main circuit power supply must be ON.
• There must be no hard wire base block (HWBB).
• There must be no alarms except for an A.C22 alarm (Phase Information Disagreement).
• 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.
5.10.2 Using the SV_ON (Servo ON) Command to Perform
Polarity Detection
You can use the SV_ON (Servo ON) command to perform polarity detection only with an incre-
mental linear encoder.
Polarity detection will be performed when you turn the control power supply to the SERVO-
PACK OFF and then ON again, and then send the SV_ON (Servo ON) command. As soon as
polarity detection is completed, the /S-RDY (Servo Ready) signal will turn ON.
Polarity detection will start simultaneously with execution of the SV_ON (Servo ON) command.
As soon as polarity detection is completed, the /S-RDY will turn ON and the servo will remain
ON.
SV_ON (Servo ON) command
/S-RDY (Servo Ready) signal
Motor power status

5.10.2 Using the SV_ON (Servo ON) Command to Perform Polarity Detection

OFF
OFF
Polarity detection in progress
 Status display: P-dt
Power not supplied.
Power supplied.
ON
ON
Completion of polarity detection
 Normal operation is enabled.
5.10 Polarity Detection
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