Yaskawa SGDH Linear Sigma Series - Manual (Page 293)

9.8 Operating Using Position Control
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9
9.8.2 Setting the Electronic Gear
(1) Scale Feedback Resolution
The scale feedback resolution from the SERVOPACK is 1/256 of the scale pitch (Pn280).
(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.
Scale Pitch Pulse Resolution
40 μm 0.156 μm
20 μm 0.078 μm
4 μm 0.016 μm
When the Electronic Gear
is Not Used When the Electronic Gear
is Used
To move a workpiece 10 mm (0.39 in.)
The scale pitch is 20 μm. Therefore,
10 ˜1000¸20˜256=128000 pulses
128000 pulses are input as reference
pulses.
The equation must be calculated at
the host controller.
To move a workpiece 10 mm using reference units
1 reference unit is 1 μm.
To move a workpiece 10 mm (10000 μm),
1 pulse = 1 μm,
10000/1=10000 pulses.
Input 10000 pulses as reference input.
Linear scale Linear scale
Reference unit㧦1 µm