YASKAWA SVC - Page 84

3.4 Motion Parameter Details
3.4.1 Fixed Parameter Details
3-31
3
Parameters for Motion Control
Reference Unit Selection
 Reference Unit Selection
Set the reference unit.
The reference unit is determined by this parameter and fixed parameter No. 5 (Number of Digits
Below Decimal Point). Refer to the following section for details on reference units.
5.1.1 Reference Unit on page 5-3
0: Pulses
1: mm
2: Degrees
3: Inches
4: mm
Setting Precautions
• For linear motors, you can use 0 (pulses), 1 (mm), and 4 (μm). If 2 (degrees) or 3 (inches) is
selected, the selected unit is converted to mm.
• If 0 (pulse) is selected, the electronic gear ratio that is set in fixed parameter No. 8 (Servomo-
tor Gear Ratio Term) and fixed parameter No. 9 (Machine Gear Ratio Term) is disabled.
 Number of Digits Below Decimal Point
Set the number of digits below the decimal point for reference units.
The minimum reference unit is determined by this parameter and fixed parameter No. 4 (Refer-
ence Unit Selection). Refer to the following section for details on reference units.
5.1.1 Reference Unit on page 5-3
Setting Precautions
This parameter is not used if fixed parameter No. 4 (Reference Unit Selection) is set to 0
(Pulses).
 Travel Distance per Machine Rotation (Rotary Motor)
Specify the amount of travel in the load in reference units for each turn of the machine.
Refer to the following section for details.
5.1.2 Electronic Gear on page 5-3
 Linear Scale Pitch (Linear Motor)
Set the linear scale pitch that is used for linear motor position detection.
Setting Precautions
If fixed parameter No. 4 (Reference Unit Selection) is set to 0 (Pulses), set the scale pitch in μm
or nm.
No. Name Setting Range Setting Unit Default
4 Reference Unit Selection 0 to 4 − 0
No. Name Setting Range Setting Unit Default
5
Number of Digits Below Deci-
mal Point
0 to 5 − 3
When Reference Unit Selection is set to mm and Number of Digits Below Decimal Point is set
to 3, a reference value of 1 means 0.001 mm.
No. Name Setting Range Setting Unit Default
6
Travel Distance per Machine
Rotation
1 to 2
31
−1
Reference units 10,000
No. Name Setting Range Setting Unit Default
6 Linear Scale Pitch
1 to 2
31
−1
Reference units 10,000
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Example
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