Mitsubishi Electric MELSERVO-J4 series Instruction Manual page 404

14. USING A LINEAR SERVO MOTOR
3) When [Pr. PC27] is set to "_ _ _ 0" and the positive direction of the linear servo motor matches
with the increasing direction of the linear encoder, if the linear servo motor operates in the
positive direction, the motor speed will be a positive value. If the positive direction of the linear
servo motor does not match with 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 with 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.
(4) Linear encoder resolution setting
Set the ratio of the electronic gear to the linear encoder resolution with [Pr. PL02 Linear encoder
resolution - Numerator] and [Pr. PL03 Linear encoder resolution - Denominator].
(a) Parameter setting
Set the values that apply to the following equation.
[Pr. PL02 Linear encoder resolution - Numerator]
[Pr. PL03 Linear encoder resolution - Denominator]
(b) Parameter setting example
When the linear encoder resolution is 0.5 µm
[Pr. PL02]
= Linear encoder resolution = 0.5 µm =
[Pr. PL03]
The following shows the simplified chart for the setting values of [Pr. PL02] and [Pr. PL03].
Setting
value
POINT
To enable the parameter value, cycle the power after setting.
0.01
[Pr. PL02] 1
[Pr. PL03] 100
POINT
If an incorrect value is set for [Pr. PL02] or [Pr. PL03], the linear servo motor
may not operate properly, or [AL. 27] or [AL. 42] may occur at the positioning
operation or the magnetic pole detection.
= Linear encoder resolution [µm]
1
2
Linear encoder resolution [µm]
0.02 0.05 0.1
1 1 1
50 20 10
14 - 9
0.2 0.5 1.0
1 1 1
5 2 1
2.0
2
1