YASKAWA SGM H Series User Manual page 458

(3) Related Parameters
Pn202 Electronic Gear Ratio (Numerator)
Setting Range
1 to 65535
Pn203 Electronic Gear Ratio (Denominator)
Setting Range
1 to 65535
If the deceleration ratio of the servomotor and the load shaft is given as n/m where m is the rotation of the servomotor and
n is the rotation of the load shaft,
B
Electronic gear ratio:
A
* If the ratio is outside the setting range, reduce the fraction (both numerator and denominator) until you obtain integers
within the range. Be careful not to change the electronic gear ratio (B/A).
IMPORTANT
Electronic gear ratio setting range: 0.01
If the electronic gear ratio is outside this range, the SERVOPACK will not operate properly. In this case, modify the load
configuration or reference unit.
(4) Procedure for Setting the Electronic Gear Ratio
Use the following procedure to set the electronic gear ratio.
Step Operation
1
Check machine specifications.
2
Check the number of encoder pulses.
3
Determine the reference unit used.
4
Calculate the travel distance per load shaft
revolution.
5
Calculate the electronic gear ratio.
6
Set parameters.
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Setting Unit
−
Setting Unit
−
Pn202
No. of encoder pulses × 4
= =
Pn203
Travel distance per load
shaft revolution (reference units)
≤
Electronic gear ratio (B/A)
Check the deceleration ratio, ball screw pitch, and pulley diameter.
Check the number of encoder pulses for the servomotor used.
Determine the reference unit from the host controller, considering the
machine specifications and positioning accuracy.
Calculate the number of reference units necessary to turn the load
shaft one revolution based on the previously determined reference
units.
Use the electronic gear ratio equation to calculate the ratio (B/A).
Set parameters using the calculated values.
8.6 Operating Using Position Control
Position
Factory Setting
4
Position
Factory Setting
1
m
×
n
≤
100
Description
Setting Validation
After restart
Setting Validation
After restart
8
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