Estun ETS-101010APC-CAN - Page 69

ETS Series AC Servo User's Manual
- 68 -
5
Calculate the electronic gear ratio.
Use the electronic gear ratio equation to calculate the ratio (B/A).
6
Set parameters.
Set parameters using the calculated values.
(4)Electronic Gear Ratio Setting Examples
The following examples show electronic gear ratio settings for different load configurations.
Step
Operation
Load Configuration
Ball Screw
Disc Table
Belt and Pulley
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
1
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
2
Encoder
17-bit:32768P/R
17-bit:32768P/R
17-bit:32768P/R
3
Determine the
reference unit
used
1 reference unit:
0.001mm(1μm)
1 reference unit:0.1°
1 reference unit:0.01mm
4
Calculate the
travel distance
per load shaft
revolution
6mm/0.001mm=6000
360°/0.1°=3600
314mm/0.01mm=31400
5
Calculate the
electronic gear
ratio
1
1
6000
432768



A
B
1
3
3600
432768



A
B
1
2
31400
432768



A
B
6
Set parameters
Pn201
131072
Pn201
393216
Pn201
262144
Pn202
6000
Pn202
3600
Pn202
31400
7
Final result
Pn201
32768
Pn201
32768
Pn201
32768
Pn202
1500
Pn202
300
Pn202
3925
·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.