CNC Setup Utility Manual
P/N 70000490C - Machine Constants
2-76 All rights reserved. Subject to change without notice.
10-December-04
Setting Default Rapid Rate
Reference machine constant parameters:
MC_2053: X Default Rapid Rate
MC_2153: Y Default Rapid Rate
MC_2253: Z Default Rapid Rate
MC_2353: U Default Rapid Rate
Default Rapid Rate sets the speed at which an axis operates in Rapid
Mode. This applies to programmed blocks or MDI commands. Jog
moves in rapid (that is, from a manual panel) can have a different rapid
rate. The machine builder sets the maximum rapid rate according to the
physical constraints of the machine. These factors include:
• Available motor torque
• Available servo drive output
• Ballscrew pitch
• Mass to be moved
• Any mechanical advantage gained by pulleys or gears
To override the default rapid rate, adjust the
FEEDRATE OVERRIDE switch.
This switch varies the rapid speed from 0 to 100% and does not affect the
maximum rapid rate set.
Spindle Parameters
Refer to MC_2900–MC_2999, Spindle-axis Setup Parameters. Use
these machine constants to configure spindle settings and gear ranges.
Reference machine constant parameter:
MC_2960: Spindle output.
Spindle output refers to the type of DC drive output provided by the
control, as required for the spindle drive in use.
Unipolar – Output varies linearly, depending on the spindle speed the
user selects. The range is 0 to +10VDC. Direction must be selected by
other means such as reversing contactors.
Bipolar – Output ranges from –10 to +10VDC. A voltage of
0 VDC represents a commanded 0-revolutions/minute (RPM) spindle
speed.
The system outputs a negative DC voltage for Spindle Reverse (M4)
commands and a positive DC voltage for Spindle Forward (M3)
commands. The DC voltage is linear with respect to the RPM of the
spindle speed command. Consequently, required voltage (0 VDC to ±10
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