YASKAWA SGMJV User Manual page 147

5 Operation
5.4.3 Electronic Gear
Encoder Resolution
Encoder resolution can be checked with servomotor model designation.
SGM V
SGMPS
(2) Procedure for Setting the Electronic Gear Ratio
Set value electric gear differs depending on the machine specifications. Use the following procedure to set the
electronic gear ratio.
Step
1
2
3
4
5
6
7
5-40
Symbol
3
D
A
Symbol
2
C
Electronic gear ratio setting range: 0.001
If the electronic gear ratio is outside this range, a parameter setting error (A.040) will be
output.
Check machine specifications.
Check the gear ratio, ball screw pitch, and pulley diameter.
Check the encoder resolution.
Check the encoder resolution for the servomotor used.
Determine the reference unit used.
Determine the reference unit from the host controller, considering the
machine specifications and positioning accuracy.
Calculate the travel distance per load shaft revolution.
Calculate the number of reference units necessary to turn the load shaft one
revolution based on the previously determined reference units.
Calculate the electronic gear ratio.
Use the electronic gear ratio equation to calculate the ratio (B/A).
Set parameters.
Set parameters Pn20E and Pn210 using the calculated values.
Turn OFF the power and ON again to enable the settings.
Specification
20-bit absolute
20-bit incremental
13-bit incremental
Specification
17-bit absolute
17-bit incremental
≤
Electronic gear ratio (B/A)
Operation
Encoder Resolutions
1048576
1048576
8192
Encoder Resolutions
131072
131072
≤
4000