Setting The Electronic Gear - YASKAWA SGDH User Manual

8 Operation

8.6.2 Setting the Electronic Gear

8.6.2 Setting the Electronic Gear
(1) Number of Encoder Pulses
SGM H-
Motor Model
Encoder Specifications
A
B
C
1
2
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
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
13653 pulses are input as reference pulses.
The equation must be calculated at the
host controller.
(Servomotor serial number)
Encoder Type No. of Encoder Pulses
13 bits
Incremental
16 bits
encoder
17 bits
16 bits
Absolute
encoder
17 bits
Workpiece
Ball screw pitch: 6 mm (0.24 in)
2048
16384
32768
16384
32768
When the Electronic Gear Is Used
No. of encoder pulses: 2048
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.
8-50
Workpiece
Reference unit: 1 µm
:
Ball screw pitch: 6 mm (0.24 in)