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5.2 Settings According to Host Controller
5 -27
5.2.5 Using the Electronic Gear Function
The electronic gear function enables the Servomotor travel distance per input reference pulse to
be set to any value. It allows the host controller generating pulses to be used for control without
having to consider the equipment gear ratio or the number of encoder pulses.
When the Electronic Gear
Function is Not Used
When the Electronic Gear
Function is Used
Ball screw pitch:
6 mm
(0.24 in)
Workpiece
No. of encoder pulses:
2048
Equipment conditions and reference
units must be defined for the electronic
gear function beforehand.
To move a workpiece 10 mm (0.39 in):
Reference unit is 1
m
m. Therefore,
Reference unit:
1
m
m
To move a workpiece 10 mm (0.39 in):
1 revolution is 6 mm. Therefore,
10
-
6 = 1.6666 revolutions
2048
´
4 pulses is 1 revolution. Therefore,
1.6666
´
2048
´
4 = 13653 pulses
13563 pulses are input as references.
The equation must be calculated at the
host controller.
No. of encoder pulses:
2048
10 mm
1
=
10000 pulses
Workpiece
Ball screw pitch:
6 mm
(0.24 in)
J
J
Setting the Electronic Gear
Calculate the electronic gear ratio (B/A) using the followingprocedure, andset thevaluesinuser
constants Pn202 and 203.
1.
Check equipment specifications.
Items related to the electronic gear:
·
Deceleration ratio
·
Ball screw pitch
·
Pulley diameter
Ball screw pitch
Deceleration ratio
2.
Check the number of encoder pulses for the SGM
j
H Servomotor.
Servomotor Model and
Encoder Specifications
Encoder Type
Number of Encoder
Pulses Per Revolution
(P/R)
A
Incremental encoder
13-bit
2048
B
16-bit
16384
C
17-bit
32768
1
Absolute encoder
16-bit
16384
2
17-bit
32768
5
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