Using Electronic Gear; Setting The Electronic Gear; Check The Machine Specifications - YASKAWA SGM series User Manual

3.2.5 Using Electronic Gear

For position control (SGDA-jjjP) only.
1) Outline
SGDA- P
The electronic gear function enables the motor travel distance per input reference pulse
Positions
to be set to any value. It allows the host controller to perform control without having to
consider the machine gear ratio and the number of encoder pulses.
When Electronic Gear Function
is Not Used
Number of
encoder
pulses: 2,048
To move a workpiece 10 mm,
One revolution is equivalent to 6 mm, so
2048 x 4 (pulses) is equivalent to one revolution, so
A total of 13653 pulses must be input as a reference.
the host controller needs to make this calculation.

2) Setting the Electronic Gear

Calculate the electronic gear ratio (B/A) according to the procedure below and set the
value in Cn-24 and Cn-25.
a) Check the machine specifications.
Items related to electronic gear:
− Gear ratio
− Ball screw pitch
− Pulley diameter
b) Check the number of encoder pulses for the SGM Servomotor.
SGM-jjj31j
SGM-jjjW1j
Workpiece
Ball screw
pitch: 6 mm
10 6 = 1.6666 (revolutions)
1.6666 x 2,048 x 4 = 13,653 (pulses)
Motor Type Encoder Type
Incremental encoder
Absolute encoder
3.2 Setting User Constants According to Host Controller
When Electronic Gear Func-
tion is Used
Number of
encoder
pulses: 2,048
Machine conditions and reference unit
must be defined for the electronic gear
function beforehand.
To move a workpiece 10 mm:
Reference unit is 1 μm, so
10 mm 1 μm = 10,000 pulses
Number of Encoder
Pulses Per Revolution
2048
1024
Same as user constant Cn-11 settings.
Reference
Workpiece
unit: 1 μm
Ball screw
pitch: 6 mm
Ball screw pitch
Gear ratio
79
3