Motion Parameters; Reference Unit; Electronic Gear - YASKAWA SVC User Manual

5.1

Motion Parameters

Set the following eight motion parameters according to the machine's specifications to ensure
correct motion control.

• Reference Unit

• Electronic Gear

• Axis Selection
• Position Reference
• Speed Reference
• Acceleration/Deceleration Settings
• Acceleration/Deceleration Filter Settings
• Linear Scale Pitch/Rated Speed (when using a linear motor)
This section describes settings for the eight items listed above.
5.1.1

Reference Unit

The motion control reference unit can be set to pulses, millimeters, degrees, inches, or
micrometers. The reference unit is set in fixed parameter No. 4 (Reference Unit Selection). The
minimum reference unit is determined by the setting in fixed parameter No. 5 (Number of Digits
Below Decimal Point).
Fixed parameter No. 5
(Number of Digits
Below Decimal Point)
0: 0 digits
1: 1 digit
2: 2 digits
3: 3 digits
4: 4 digits
5: 5 digits
5.1.2 Electronic Gear
The amount of change in the mechanical system (i.e., the travel distance) for the input of 1 ref-
erence unit is called the output unit. The electronic gear converts positions or speeds from ref-
erence units to output units for the mechanical system without going through an input
mechanism, such as a gear.
If the mechanical configuration is such that rotating the Servomotor axis m times results in
rotating the load axis n times, this electronic gear can be used to make the output units equiv-
alent to the reference units.
The electronic gear is set with the following fixed parameters.
• No. 6 (Travel Distance per Machine Rotation)
• No. 8 (Servomotor Gear Ratio Term)
• No. 9 (Machine Gear Ratio Term)
The electronic gear cannot be used if fixed parameter No. 4 (Reference Unit Selection) is set to 0
(Pulses).
Important
Fixed parameter No. 4 (Reference Unit Selection)
0: pulse 1: mm
1 pulse 1 mm
1 pulse 0.1 mm
1 pulse 0.01 mm
1 pulse 0.001 mm
1 pulse 0.0001 mm
0.00001 mm 0.00001 deg 0.00001 inch 0.00001 μm
1 pulse
2: deg 3: inch
1 deg 1 inch
0.1 deg 0.1 inch
0.01 deg 0.01 inch
0.001 deg 0.001 inch
0.0001 deg 0.0001 inch

5.1 Motion Parameters

5.1.1 Reference Unit
4: μm
1 μm
0.1 μm
0.01 μm
0.001 μm
0.0001 μm
5
5-3