Electronic Gear - YASKAWA SGMJV User Manual

4.4.3 Electronic Gear

The electronic gear enables the workpiece travel distance per reference unit input from the host controller. The
minimum unit of the position data moving a load is called a reference unit.
The section indicates the difference between using and not using an electronic gear when a
workpiece is moved 10 mm in the following configuration.
Encoder resolution (20 bit) 1048576
When the Electronic Gear is Not Used:
Calculate the revolutions.
1 revolution is 6 mm. Therefore, 10 ÷ 6 = 10/6 revolutions.
Calculate the required reference units.
1048576 reference units is 1 revolution. Therefore, 10/6 × 1048576 = 1747626.66 reference units.
Input 1747627 references as reference units.
Reference units must be calculated per reference. → complicated
When the Electronic Gear is Used:
The reference unit is 1 μm. Therefore, to move the workpiece 10 mm (10000 μm),
1 reference unit = 1 μm, so 10000
Input 10000 reference units.
Calculation of reference units per reference is not required. → simplified
(1) Electronic Gear Ratio
Set the electronic gear ratio using Pn20E and Pn210.
Electronic Gear Ratio (Numerator)
Pn20E
Setting Range
1 to 1073741824
Electronic Gear Ratio (Denominator)
Pn210
Setting Range
1 to 1073741824
If the gear ratio of the servomotor and the load shaft is given as n/m where m is the rotation of the servomotor
and n is the rotation of the load shaft,
Electronic gear ratio:
Workpiece
÷ 1 = 10000 reference units.
Setting Unit
1
Setting Unit
1
B Pn20E
Encoder resolution
= =
A Pn210
Travel distance per load
shaft revolution (reference units)
Ball screw pitch: 6 mm
Position
Factory Setting When Enabled
4 After restart
Position
Factory Setting When Enabled
1 After restart
m
×
n
4.4 Trial Operation
Classification
Setup
4
Classification
Setup
4-25