Yaskawa MP2000 Series I/O Module User Manual - Manual (Page 118)

4.5 Electronic Gear Function
4.5.2 Settings
118
Œ When reference unit is 1 μm:
When 50,000 reference pulses are input, the workpiece will be moved by 50,000 × 1 μm = 50 mm.
4. Find the load travel distance for each rotation of the load axis using the reference unit and set this dis-
tance to the counter fixed parameter No. 10 (Travel Distance per Machine Rotation).
• Calculation Examples
• For a ball screw pitch of 5 mm and a reference unit of 0.001 mm:
(Reference unit)
5.
Set the Encoder Gear Ratio and the Machine Gear Ratio in the counter fixed parameters No. 11 and
No.12.
When the encoder axis has rotated m times and the mechanical configuration allows the load axis to rotate n
times, set the following values:
No. 11 (Encoder Gear Ratio) = m rotations
No. 12 (Machine Gear Ratio) = n rotations
Setting range: 1 to 65,535 [rotations]
For the configuration shown in the diagram:
Gear ratio = n/m = (3/7) × (4/9) = 4/21
Therefore, set the following values:
No.11 (Encoder Gear Ratio) = 4 (rotations)
No.12 (Machine Gear Ratio) = 21 (rotations)
Ball screw Rotary table Belt + pulley
Load travel distance per load axis rotation
Reference unit
Load travel distance per rotation
of load axis (reference unit)
=
EXAMPLE
5
0.001
------------- 5000 =
P
One
rotation
P
Reference unit
=
Load axis
P: Pitch
360°
Reference unit
Load axis
One
rotation = Reference unit
Load axis
D: Pulley diameter
D
π D
=
π D One
rotation
エンコーダ軸
m 回転
7回転
3回転
9回転
4回転
負荷軸 n 回転 Encoder axis
m rotations
7 rotations
4 rotations
9 rotations
3 rotations
Load axis n rotations