·322·
Installation manual
CNC 8055
CNC 8055i
7.
CONCEPTS
SOFT: V02.2X
Axis setting
7.5.1 Drive adjustment
Offset (drift) adjustment
This adjustment is made on one axis at a time:
• Select the JOG mode at the CNC and press the softkey sequence: [Display] [Following error].
The CNC shows the current following Error (axis lag) of the axes.
• Adjust the offset by turning the offset potentiometer at the drive (NOT AT THE CNC) until a "0"
following error is obtained.
Maximum feedrate adjustment
The drives should be adjusted so they provide maximum axis feedrate when receiving a velocity
command of 9.5 V.
Set each axis parameter MAXVOLT (P37) = 9500 so the CNC outputs a maximum velocity command
of 9.5 V.
The maximum axis feedrate, axis parameter MAXFEED (P42), depends on the motor rpm as well
as on the gear ratio and type of ballscrew being used.
Example for the X axis:
The maximum motor rpm is 3,000 and the ballscrew pitch is 5mm/rev. Thus:
Maximum rapid traverse feedrate (G00) = ballscrew rpm. x ballscrew pitch
"MAXFEED" (P42) = 3,000 rpm. x 5 mm/rev. = 15000 mm/min.
In order to adjust the drive, axis parameter G00FEED (P38) should be set to the same value as axis
parameter MAXFEED (P42).
Also, a small CNC program must be executed that will move the axis back and forth a short distance
in order to verify that the amount of following error in both directions is the same. One such program
could be:
While the axis is moving back and forth, measure the analog command provided by the CNC to the
drive and adjust the feed potentiometer at the drive (NOT AT THE CNC) until reaching 9.5 V.
N10
N20
G00 G90 X200
X-200
(RPT N10, N20)
To Next Page
Loading...
