CNC Setup Utility Manual
P/N 70000490C - Machine Constants
All rights reserved. Subject to change without notice.
10-December-04
2-19
Table 2-2, Machine Constants Setup
(Continued)
Machine Constant
Parameter
Function Settings
MC_2027:
X Pos. Control Output
Limit (rpm)
Limits the X-axis output of the positional
controller and the standard speed value.
Range (0.00–10000.00)
0.00 (rev/min) [Default]
MC_2028:
X Velocity FeedFwd.
Gain
X-axis velocity feed forward gain.
No
[Default]
Yes
MC_2029:
X Acceleration
FeedFwd. Gain
(.1mAs
2
/rev)
X-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_2030:
X Coulomb Friction
FeedFwd. Gain (mA)
X-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_2031:
X Torque Offset (mA)
X-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_2032:
X Friction FeedFwd.
Timecons (.1ms)
X-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_2033:
X Damping FeedFwd.
at Nnom (mA)
X-axis damping compensation at
standard speeds. Used for heavy
machines.
Range (-10000.00–10000.00)
0.00 (mA) [Default]
MC_2034:
X Torque LP Filter
Timecons (.1ms)
X-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_2035:
X 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_2025) or
with the MC_2034.
Range (0.00–10000.00)
0.00 (0.1Hz) [Default]
MC_2036:
X Torque Notch Filter
Damp. (.1dB
)
X-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]
(Continued…)
