Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 474

Setting of linear encoder direction and 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 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
■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 follows.
[Pr. PA14] setting
0
1
The positive/negative directions of the linear servo motor are as follows.
Negative
direction
Positive
direction
LM-H3/LM-F series
2.
Confirm the increasing direction of the linear encoder.
3.
If the positive direction of the linear servo motor matches the increasing direction of the linear encoder, set [Pr. PC27] to
"_ _ _ 0". If the positive direction of the linear servo motor does not match the increasing direction of the linear encoder,
set [Pr. PC27] to "_ _ _ 1".
■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.
3.
A positive value is displayed for the motor speed when (1) [Pr. PC27] is set to "_ _ _ 0", (2) the positive direction of the
linear servo motor matches the increasing direction of the linear encoder, and (3) the linear servo motor is operated in
the positive direction. If the positive direction of the linear servo motor does not match the increasing direction of the
linear encoder, the motor speed will be a negative value. When [Pr. PC27] is set to "_ _ _ 1" and the positive direction of
the linear servo motor matches the increasing direction of the linear encoder, if the linear servo motor operates in the
positive direction, the motor speed will be a negative value.
14 USING A LINEAR SERVO MOTOR
472
14.3 Operation and functions
Travel direction of linear servo motor
Address increasing command
Positive direction
Negative direction
Secondary
side
Secondary side
Primary side
Primary
side
Positive
direction
Negative direction
LM-U2 series
Address decreasing command
Negative direction
Positive direction
Negative
direction
Positive
direction
Table
Primary
side
LM-K2 series
Secondary
side