ProNet Plus Series AC Servo User's Manual
(3)Procedure for Setting the Electronic Gear Ratio
Use the following procedure to set the electronic gear ratio.
Check machine specifications.
Check the deceleration ratio, ball screw pitch and pulley
diameter.
Check the number of encoder
pulses.
Check the number of encoder pulses 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.s
Calculate the electronic gear ratio.
Use the electronic gear ratio equation to calculate the ratio (B/A).
Set parameters using the calculated values.
(4)Electronic Gear Ratio Setting Examples
The following examples show electronic gear ratio settings for different load configurations.
17-bit encoder
Ball screw pitch：6mm
Reference unit：0.001mm
Load shaft
Reference unit：0.1º
Load shaft
17-bit encoder
Deceleration ratio:
3：1
Reference unit：0.01mm
Load shaft
Deceleration ratio:
2：1
17-bit encoder
Pulley diameter:
F 100mm
Check machine
specifications.
Ball screw pitch:6mm
Deceleration ratio:1/1
Rotation angle per
revolution:360°
Deceleration ratio:3/1
Pulley diameter:100 mm
(pulley circumference:314 mm)
Deceleration ratio:2/1
Determine the
reference unit
used
1 reference unit:
0.001mm(1μm)
Calculate the
travel distance
per load shaft
revolution
Calculate the
electronic gear
ratio
·Reduce the fraction (both numerator and denominator) if the calculated result will not be within the setting range.
·For example, reduce the above numerators and denominators by four or other numbers to obtain the final results in step
7 and complete the settings.
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