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14. USING A LINEAR SERVO MOTOR
(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.
(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.
The positive/negative directions of the linear servo motor are as follows.
Negative
direction
Positive
direction
Primary side
LM-H3 and LM-F 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.
[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
[Pr. PA14] setting
0
1
Secondary side
Secondary
side
LM-U2 series
Travel direction of linear servo motor
Address increasing
command
Positive direction
Negative direction
Primary
side
Positive
direction
Negative direction
14 - 8
Address decreasing
command
Negative direction
Positive direction
Negative
direction
Positive
direction
Table
Primary
side
LM-K2 series
Secondary
side
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