Yaskawa Sigma-5 User Manual: Design and Maintenance - Rotary Motors - Manual (Page 92)

4.2 Settings for Common Basic Functions
4-9
Operation
Encoder Resolution
Encoder resolution can be checked with servomotor model designation.
(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.
Electronic gear ratio setting range: 0.001 ≤ Electronic gear ratio (B/A) ≤ 4000
If the electronic gear ratio is outside this range, a parameter setting error (A.040) will be
output.
SGM V  
Symbol Specification Encoder Resolutions
Symbol Specification Encoder Resolutions
3 20-bit absolute 1048576
D 20-bit incremental 1048576
A 13-bit incremental 8192
SGMPS  
2 17-bit absolute 131072
C 17-bit incremental 131072
Step Operation
1
Check machine specifications.
Check the gear ratio, ball screw pitch, and pulley diameter.
2
Check the encoder resolution.
Check the encoder resolution for the servomotor used.
3
Determine the reference unit used.
Determine the reference unit from the host controller, considering the
machine specifications and positioning accuracy.
4
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.
5
Calculate the electronic gear ratio.
Use the electronic gear ratio equation to calculate the ratio (B/A).
6
Set parameters.
Set parameters Pn20E and Pn210 using the calculated values.
7 Turn OFF the power and ON again to enable the settings.