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Mitsubishi Electric MELSERVO-J5 User Manual page 458

Ac servo system
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Setting the polarity of the load-side encoder [G] [WG]
Precautions
• Do not set the incorrect direction in [Pr. PC27.0 Encoder pulse count polarity selection].
If the correct direction is not set, the encoder will not operate correctly, possibly causing a collision that results in an accident
or damage to other devices.
• [Pr. PC27.0 Encoder pulse count polarity selection] is not related to [Pr. PA14 Travel direction selection].
Set this parameter according to the relationship between the servo motor and the linear encoder /rotary encoder.
• Do not set the incorrect direction in [Pr. PC27.0 Encoder pulse count polarity selection].
During the positioning operation, [AL. 042 Fully closed loop control error] may occur.
■Servo parameter
Set the polarity of the load-side encoder that is connected to the CN2L connector so that the CCW direction of the servo motor
matches the increasing direction of the load-side encoder feedback.
• [Pr. PC27.0_Encoder pulse count polarity selection]
0: Load-side encoder pulse increasing direction in the servo motor CCW
1: Load-side encoder pulse decreasing direction in the servo motor CCW
Servo motor
Linear encoder
■Checking the feedback direction of the load-side encoder
Refer to the following for checking the feedback direction of the load-side encoder.
Page 461 Checking position data of the load-side encoder
12 USING A FULLY CLOSED LOOP SYSTEM
456
12.4 Startup
Servo motor CCW direction
Address increasing direction of linear encoder

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