CNC Setup Utility Manual
P/N 70000490C - Machine Constants
All rights reserved. Subject to change without notice.
10-December-04
2-41
Table 2-2, Machine Constants Setup
(Continued)
Machine Constant
Parameter
Function Settings
MC_2927:
Spindle Pos. Control
Output Limit (rpm)
Limits the spindle-axis output of the
positional controller and the standard
speed value.
Range (0.00–10000.00)
0.00 (rev/min) [Default]
MC_2928:
Spindle Velocity
FeedFwd. Gain
Spindle-axis velocity feed forward gain.
No
[Default]
Yes
MC_2929:
Spindle Acceleration
FeedFwd. Gain
(.1mAs
2
/rev)
Spindle-axis acceleration feed forward
gain. In practice, this value is 2 to 3
times the motor inertia.
Range (0.0–10000.00)
0.0 (0.1mAs
2
/rev) [Default]
MC_2930:
Spindle Coulomb
Friction FeedFwd.
Gain (mA)
Spindle-axis torque compensation gain
for friction at low rotational speed.
Produces an offset according to
direction of travel.
Range (-10000.0–10000.0)
0.00 (mA) [Default]
MC_2931:
Spindle Torque Offset
(mA)
Spindle-axis constant torque to offset
the compensation (for example, for
gravitational force in a vertical axis).
Range (-10000.00–10000.00)
0.00 (mA) [Default]
MC_2932:
Spindle Friction
FeedFwd. Timecons
(.1ms)
Spindle-axis delay of the friction
compensation to prevent
overcompensating when changes in
direction occur at high speeds.
Typical value: 150 (0.1 msec).
Range (0.00–10000.00)
0.00 (0.1 ms) [Default]
MC_2933:
Spindle Damping
FeedFwd. at Nnom
(mA)
Spindle-axis damping compensation at
standard speeds. Used for heavy
machines.
Range (-10000.00–10000.00)
0.00 (mA) [Default]
MC_2934:
Spindle Torque LP
Filter Timecons (.1ms)
Spindle-axis torque lowpass filter time
constant is used when there is
insufficient dumping of the axis.
Standard value is zero.
Realistic input values 3–20 (0.1msec)
Range (0.00–10000.00)
0.00 (0.1ms) [Default]
MC_2935:
Spindle Torque Notch
Filter Freq. (.1Hz)
Vibrations can occur on critical axes
and at the spindle in a frequency range,
which cannot be compensated either
with the differential factor (MC_2925) or
with the MC_2934.
Range (0.00–10000.00)
0.00 (0.1Hz) [Default]
MC_2936:
Spindle Torque Notch
Filter Damp. (.1dB)
Spindle-axis damping values of the
torque band-stop filter.
Damping should not be set
unnecessarily high which would restrict
the operation of the control loop.
Realistic input values are 30–90
(0.1dB).
Range (0.00–10000.00)
0.00 (0.1dB) [Default]
