User`s manual
5.4 Settings According to Device Characteristics
5-13
5
Parameter Setting and Functions
5.4 Settings According to Device Characteristics
This section describes the procedure for setting parameters according to the dimensions and performance of
the equipment used.
5.4.1 Setting Reference Units
Reference units are the position and distance units that are used between the host controller and INDEXER
Module. A reference unit is the minimum unit for positioning. The electronic gear ratio converts encoder pulse
units into reference units.
(1) Setting Reference Units
Determine the reference unit to be used.
<Example>
• 0.01 mm, 0.001 mm, 0.1°, or 0.01 inch.
A reference input of one pulse moves the table by one reference unit.
• When the reference unit is 1
μm
If a reference of 50000 pulses is input, the table moves 50 mm (50000 × 1
μm).
(2) Setting Electronic Gear Ratio
After deciding the reference unit, set the electronic gear ratio.
For details on the setting method, refer to the following manuals.
•
Σ
-V Series User's Manual Design and Maintenance Rotational Motor/Command Option Attachable Type
(SIEP S800000 60)
•
Σ
-V Series User's Manual Design and Maintenance Linear Motor/Command Option Attachable Type
(SIEP S800000 66)
10 mm
1
=
10000 reference units
One revolution is 6 mm. Therefore,
10 ÷ 6 = 1.6666 revolutions.
1048576 pulses make one revolution.
Therefore,
1.6666 × 1048576 = 1746928 pulses.
1746928 pulses are input as references.
The equation must be calculated at the host
controller.
When the Electronic Gear
Function is Not Used
Workpiece
Ball screw pitch:
6 mm
Encoder resolution:
1048576
To move a workpiece 10 mm:
When the Electronic Gear
Function is Used
Workpiece
Ball screw pitch:
6 mm
No. of encoder
pulses: 2048
To move a workpiece 10 mm:
To move table in 0.001-mm unit
Reference unit: 0.001 mm
Determine the reference unit according to
equipment specifications and positioning accuracy.
Electronic gear ratio setting range: 1 ≤ Electronic gear ratio (B/A) ≤ 4000
If a value smaller than 1 is set, the motor may not rotate at its maximum speed.
And if a value larger than 4000 is set, a “parameter setting error (A.040) alarm” occurs.