Mitsubishi Electric MELSEC-LD77MS2 User Manual page 165

(Example)
• When an error does not occur
In the case of AP = 4194304 [PLS], AL = 2000000 [
the value is within the range as follows.
Electronic gear
• When an error occurs
In the case of AP = 4194304 [PLS], AL = 10 [
out of the range as follows.
Electronic gear
Number of pulses per rotation (AP)
Pr.2
Set the number of pulses required for a complete rotation of the motor shaft.
If you are using the Mitsubishi servo amplifier MR-J4(W)-B/MR-JE-B/MR-J3(W)-B,
set the value given as the "resolution per servomotor rotation" in the
speed/position detector specifications.
Number of pulses per rotation (AP) = Resolution per servomotor rotation
Movement amount per rotation (AL),
Pr.3
The amount how the workpiece moves with one motor rotation is determined by
the mechanical structure.
If the worm gear lead (  m/rev) is PB and the deceleration rate is 1/n, then
Movement amount per rotation (AL) = PB  1/n
However, the maximum value that can be set for this "movement amount per
rotation (AL)" parameter is 20000000.0  m (20m). Set the "movement amount per
rotation (AL)" as shown below so that the "movement amount per rotation (AL)"
does not exceed this maximum value.
Movement amount per rotation (AL)
= PB  1/n
= Movement amount per rotation (AL)  Unit magnification (AM)
Note) The unit magnification (AM) is a value of 1, 10, 100 or 1000. If the "PB 
1/n" value exceeds 20000000.0  m (20m), adjust with the unit magnification
so that the "movement amount per rotation (AL) " does not exceed
20000000.0  m (20m).
1: Refer to Section 13.3.2 "Electronic gear function" information about electric
gear.
setting value
Pr.1
0.1 to 2000000.0 (  m)
0 : mm
1 : inch 0.00001 to 2000.00000 (inch)
2 : degree 0.00001 to 2000.00000 (degree)
3 : PLS 1 to 200000000 (PLS)
AP 4194304
= AM =
AL 2000000
AP 4194304
= AM =
AL 10
Value set with GX Works2
(unit)
5 - 25
Chapter 5 Data Used for Positioning Control
-5
 10
1 = 2.097152
-1
 10 μm], and AM = 1, the value is
1 = 419430.4
Unit magnification (AM)
Pr.4
Value set with sequence program
1 to 200000000 (  10
1 to 200000000 (  10
1 to 200000000 (  10
1 to 200000000 (PLS)
degree], and AM = 1,
(unit)
-1
 m)
-5
inch)
-5
degree)