Estun pronet series, User Manual

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ProNet Series AC Servo User's Manual
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(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
：
0.01mm
Load shaft
Deceleration ratio:
2
：
1
17-bit encoder
Pulley diameter:
F 100mm
1
Check machine
specifications. Ball screw pitch:mm
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(1
μ m)
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
4 32768
×
×
=
A
B
1
3
3600
4 32768
×
×
=
A
B
1
2
31400
4 32768
×
×
=
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.
(5)Electronic Gear Ratio Equation
： Deceleration ratio
Reference pulse
) / (
P mm
l
Δ
B
A
+
—
Speed
loop
×4
n
Pitch ＝ P （ mm/rev ）
m
Servomotor
P
G
(P/rev))
: ) / (
P mm
l
Δ
Reference unit
Encoder pulses
P （ mm/rev ）： Ball screw pitch
n
m
m P
A
B p n
G
× × = ×
Δ
×
4 ) (
l
n
m
P
P
p n
m P
A
B
G G ×
Δ
×
=
×
Δ × × ×
=
l
l
4 4
) (
Set A and B with the following parameters ：
A B
：
Pn202
：
Pn201
P
G
(P/rev)) ：
Position
loop