YASKAWA SGM series User Manual page 92

f) Set the electronic gear ratio in the user constants below.
Reduce the electronic gear ratio
integer smaller than 65535, then set A and B in the following user constants.
 
Cn-24 RATB Electronic gear ratio (numerator)
B
A
Cn-25 RATA Electronic gear ratio (denominator)
This is all that is required to set the electronic gear.
RATB
Cn-24 Electronic Gear Ratio
(Numerator)
RATA
Cn-25 Electronic Gear Ratio
(Denominator)
These user constants are for position control
(SGDA-jjjP) only.
Set the electronic gear ratio according to machine
specifications.

B
Electronic gear ratio
A
B = [(Number of encoder pulses) x 4] x [Motor shaft rotating speed]
A = [Reference unit (load travel distance per revolution of load shaft)] x [Load shaft
rotating speed]
Note that the user constant settings must meet the following condition:
 
B
0.01 ≤ ≤ 100
A
3.2 Setting User Constants According to Host Controller
 
B
to their lowest terms so that both A and B are an
A
Unit: Setting Factory
None Range: 1 Setting: 1
to 65535
Unit: Setting Factory
None Range: 1 Setting: 1
to 65535
Input
reference
pulse

= Cn-24
Cn-25
For Position
Control Only
For Position
Control Only
Servopack
Servomotor
Electro-
nic gear
81
3