Mitsubishi MR-J4-10A Instruction Manual page 520

15. USING A LINEAR SERVO MOTOR
(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
15.3.2 Magnetic pole detection
Before the positioning operation of the linear servo motor, make sure to perform the magnetic pole detection.
When [Pr. PL01] is set to the initial value, perform the magnetic pole detection only at the first servo-on after
the power is turned on.
The magnetic pole detection includes the following two methods. Each method has advantages and
disadvantages. Select a magnetic pole detection method suitable for your usage.
The position detection method is selected the initial value.
Magnetic pole detection
Position detection method
Minute position detection method
POINT
To enable the parameter values, 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.
1. The magnetic pole detection has a
2. The adjustment procedure at the
1. The travel distance at the
2. Even for equipment with small
= Linear encoder resolution [µm]
1
2
Linear encoder resolution [µm]
0.02 0.05 0.1
1 1 1
50 20 10
Advantage
high degree of accuracy.
magnetic pole detection is simple.
magnetic pole detection is short.
friction, the magnetic pole
detection is available.
15 - 9
0.2 0.5 1.0
1 1 1
5 2 1
Disadvantage
1. The travel distance at the
magnetic pole detection is long.
2. For equipment with small friction,
the initial magnetic pole detection
error may occur.
1. The adjustment procedure at the
magnetic pole detection is
complex.
2. If a disturbance occurs during the
magnetic pole detection, [AL. 27
Initial magnetic pole detection
error] may occur.
2.0
2
1