Yaskawa SGDB - Manual (Page 93)

3.2 Setting Parameters According to Host Controller
81
6. Set the electronic gear ratio in the parameters below.
Reduce the electronic gear ratio

B
A

to their lowest terms so that both A and B are an
integer smaller than 65535, then set A and B in the following parameters.

B
A
 Cn-24 RATB Electronic gear ratio (numerator)
Cn-25 RATA Electronic gear ratio (denominator)
This is all that is required to set the electronic gear.
Cn-24
RATB
Electronic Gear Ratio
(Numerator)
Unit:
None
Setting
Range: 1
to 65535
Factory
Setting: 4
For Position
Control Only
Cn-25
RATA
Electronic Gear Ratio
(Denominator)
Unit:
None
Setting
Range: 1
to 65535
Factory
Setting: 1
For Position
Control Only
Set the electronic gear ratio according to machine
specifications.
Electronic gear ratio

B
A

= Cn-24
Cn-25
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 parameter settings must meet the following condition:
0.01 ≤
 B
A

≤ 100
3
Input
reference
pulse
SGDB
SERVOPACK
SGMj
servomotor
Electro-
nic gear