Setting The Electronic Gear; Operating Using Position Control - YASKAWA E-II Series User Manual

8.6.2 Setting the Electronic Gear

(1) Number of Encoder Pulses
SGMVH-
Motor Model
Encoder Specifications
C
2
3
Note: For details on reading servomotor model numbers, refer to 2.1 Servomotor Model Designations.
The number of bits representing the resolution of the applicable encoder is not the same as the number of encoder signal
INFO
pulses (phases A and B). The number of bits representing the resolution is equal to the number of encoder pulses × 4 (mul-
tiplier).
(2) Electronic Gear
The electronic gear enables the workpiece travel distance per input reference pulse from the host controller to be
set to any value. One reference pulse from the host controller, i.e., the minimum position data unit, is called a ref-
erence unit.
When the Electronic Gear
Is Not Used
No. of encoder pulses: 2048 P/Rev
To move a workpiece 10 mm:
1 revolution is 6 mm. Therefore,
10 ÷ 6 = 1.6666 revolutions
2048 × 4 pulses is 1 revolution. Therefore,
1.6666 × 2048 × 4 = 13653 pulses
13653 pulses are input as reference pulses.
The equation must be calculated at the
host controller.
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(Servomotor model)
No. of Encoder Pulses
Encoder Type
(P/Rev)
Incremental
17 bits
encoder
17 bits
Absolute
encoder
20 bits
Workpiece
Ball screw pitch: 6 mm
No. of encoder pulses: 2048 P/Rev

8.6 Operating Using Position Control

32768
32768
262144
When the Electronic Gear Is Used
Workpiece
Ball screw pitch: 6 mm
To move a workpiece 10 mm using reference units:
The reference unit is 1 μm. Therefore,
To move the workpiece 10 mm (10000 μm),
1 pulse = 1 μ m, so
10000/1=10000 pulses.
Input 10000 pulses per 10 m m of workpiece
movement.
Reference unit: 1 μm
:
8
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