5.2 Settings According to Host Controller
5 -29
6.
Set the user constants.
Reduce the electronic gear ratio B
A
to the lower terms so that both A and B are integers
smaller than 65535, then set A and B in the respective user constants.
B
A
Pn202
Pn203
Electronic Gear
Ratio (Numerator)
Electronic Gear
Ratio (Denominator)
That is all that is required to set the electronic gear ratio.
Pn202
Electronic Gear Ratio
(Numerator)
Unit:
None
Setting
Range:
1 to 65535
Factory
Setting:
4
Position Control
Pn203
Electronic Gear Ratio
(Denominator)
Unit:
None
Setting
Range:
1 to 65535
Factory
Setting:
1
Position Control
Set the electronic gear ratio according to equipment specifications.
M
Reference
input pulse
SGDH Servopack
SGM
j
H Servomotor
Electronic
gear
B
A
Electronic gear ratio B
A
=
Pn202
Pn203
·
B = [(Number of encoder pulses)
´
4]
´
[motor speed]
·
A = [Reference units (travel distance per load shaft revolution)]
´
[load shaft revolution
speed]
J
J
Electronic Gear Setting Examples
The following examples show electronic gear settings for different load mechanisms.
Ball Screws
Ball screw pitch: 6mm (0.24 in)
13-bit incremental
encoder
Load shaft
Reference unit: 0.001 mm
Travel distance per load shaft revolution
=
6 mm
0.001 mm
=
6000
Electronic gear ratio B
A
=
2048
×
4
×
1
6000
×
1
=
Pn202
Pn203
Preset Val-
ues
Pn202
8192
ues
Pn203
6000
5
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