Estun ETS Series - Page 68

ETS Series AC Servo User's Manual
- 67 -
Pn202
16 Bit Electronic Gear Ratio (Denominator)
Setting Range
Setting Unit
Factory Setting
Setting Validation
1～65535
—
1
After restart
Pn705
32 Bit Electronic Gear Ratio (Numerator,H)
Setting Range
Setting Unit
Factory Setting
Setting Validation
1～9999
10000
0
After restart
Pn706
32 Bit Electronic Gear Ratio (Numerator,L)
Setting Range
Setting Unit
Factory Setting
Setting Validation
1～9999
1
1
After restart
Pn707
32 Bit Electronic Gear Ratio (Denominator,H)
Setting Range
Setting Unit
Factory Setting
Setting Validation
1～9999
10000
0
After restart
Pn708
32 Bit Electronic Gear Ratio (Denominator,L)
Setting Range
Setting Unit
Factory Setting
Setting Validation
1～9999
1
1
After restart
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.
Electronic gear ratio:
202
201
Pn
Pn
A
B

n
m
unitsreferencerevolutionshaft
loadpercedisTravel
pulsesencoderofNo



)(
tan
4.
·When 32 bit electronic gear function is enabled,
70810000707
70610000705
PnPn
PnPn
A
B



.
·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≤electronic gear ratio(B/A)≤ 100
·If the electronic gear ratio is outside this range, the servo drive will not operate properly. In this case, modify the load
configuration or reference unit.
(3)Procedure for Setting the Electronic Gear Ratio
Use the following procedure to set the electronic gear ratio.
Step
Operation
Description
1
Check machine specifications.
Check the deceleration ratio, ball screw pitch and pulley
diameter.
2
Check the number of encoder
pulses.
Check the number of encoder pulses 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.s