Mitsubishi Electric MR-J4W2, Instruction Manual, Page: 301 / 542

14. USING A LINEAR SERVO MOTOR
14 - 6
(3) Settings of the linear encoder direction and the linear servo motor direction
Set the first digit of [Pr. PC27] (Encoder pulse count polarity selection) so that the positive direction of
the linear servo motor matches with the increasing direction of the linear encoder feedback.
[Pr. PC27]
Encoder pulse count polarity selection
0: Linear servo motor positive direction and linear encoder increasing direction
1: Linear servo motor positive direction and linear encoder decreasing direction
(a) Parameter setting method
1) Confirm the positive direction of the linear servo motor. [Pr. PA14] determines the relation of the
travel direction of the linear servo motor under commands as shown below.
[Pr. PA14] setting
Travel direction of linear servo motor
Address increasing
command
Address decreasing
command
0 Positive direction Negative direction
1 Negative direction Positive direction
The positive/negative directions of the linear servo motor are as follows.
Secondary
side
Primary side
Positive
direction
Negative
direction
LM-H3 series
Negative direction
Positive
direction
Secondary side
Primary
side
LM-U2 series
Negative
direction
Positive
direction
Table
Primary
side
Secondary
side
LM-K2 series
2) Confirm the increasing direction of the linear encoder.
3) If the positive direction of the linear servo motor matches with the increasing direction of the
linear encoder, set [Pr. PC27] to "_ _ _ 0". If the positive direction of the linear servo motor does
not match with the increasing direction of the linear encoder, set [Pr. PC27] to "_ _ _ 1".
(b) Confirmation method
Confirm the positive direction of the linear servo motor and the increasing direction of the linear
encoder in the following procedure.
1) In servo-off status, move the linear servo motor in the positive direction manually.
2) Confirm the motor speed (in the positive and negative directions) at that time with MR
Configurator2.