
3. α SERIES PARAMETER ADJUSTMENT B-65150E/04
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3.4.4 High-Speed Positioning Adjustment Procedure
(1) Overview
This section describes the adjustment procedure for high-speed
positioning required with a punch press and PC board drilling machine.
(2)
Adjustment procedure
Make a high-speed positioning adjustment while viewing the VCMD
(servo error amount) and TCMD. Set a measurement range as
described below.
• VCMD: Adjust the VCMD magnification, measurement voltage
level (when an analog check board is used), and
measurement range (when the servo adjustment
software is used) to allow viewing to a requested
positioning precision. In the example below, a
requested precision of 10 µm is assumed.
• TCMD: Make an adjustment to view a specified maximum
current value. If an adjustment is made to reduce
positioning time, TCMD saturation may occur. Make
an adjustment so that the TCMD lies within a specified
maximum current.
<1> I-P control setting
Select I-P control for velocity loop control. In general, PI control
reduces start-up time for a command, but requires a longer setting
time, so that PI control is not suitable for high-speed positioning.
On the other hand, I-P control reduces time required to reach a
target position, so that I-P control is generally used for high-speed
positioning adjustment.
Fig. 3.4.4 (a) When PI control is used Fig. 3.4.4 (b) When I-P control is used
TCMD
VCMD
20
µ
m
270 ms
Specified maximum
300 ms
TCMD
VCMD