Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 544

■Parameter setting method
• Selection of the encoder pulse count polarity
This parameter is used to set the load-side encoder polarity to be connected to CN2L connector in order to match the CCW
direction of servo motor and the increasing direction of load-side encoder feedback. Set this as necessary.
[Pr. PC27]
0 0 0
Encoder pulse count polarity selection
0: Encoder pulse increasing direction in the servo motor CCW or positive direction
1: Encoder pulse decreasing direction in the servo motor CCW or positive direction
Servo motor
Linear encoder
• A/B/Z-phase input interface encoder Z-phase connection judgment function
This function can trigger an alarm by detecting non-signal for Z phase.
The Z-phase connection judgment function is enabled by default. To disable the Z-phase connection judgment function, set
[Pr. PC27].
[Pr. PC27]
0 0 0
Selection of A/B/Z-phase input interface encoder Z-phase connection judgement function
0: Enabled
1: Disabled
■How to confirm the scale measurement encoder feedback direction
You can confirm the directions of the cumulative feedback pulses of servo motor encoder and the load-side cumulative
feedback pulses are matched by moving the device (scale measurement encoder) manually in the servo-off status. If
mismatched, reverse the polarity.
Confirmation of scale measurement encoder position data
Check the scale measurement encoder mounting and parameter settings for any problems.
Operate the device (scale measurement encoder) to check the data of the scale measurement encoder is renewed correctly.
If the data is not renewed correctly, check the scale measurement encoder mounting, wiring, and parameter settings. Change
the scale polarity as necessary.
17 APPLICATION OF FUNCTIONS
542
17.1 Scale measurement function
Servo motor CCW direction
Address increasing direction of linear encoder