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Xenus XSL User Guide
Quick Setup with CME 2
Copley Controls Corp.
117
5.13.2.2
Set up a trapezoidal profile by setting the trajectory limits and distance. See table:
Trajectory Limits Tab
Maximum Velocity
Maximum
Acceleration
Maximum
Deceleration
Set values typical of those expected to be used in the application.
Profile Tab
Distance
Set the move distance to produce a complete trajectory profile. Be sure that this
distance does not exceed mechanical limits of the system.
Move Relative
Type Trap
5.13.2.3
Adjust position proportional gain (
Pp
) to minimize following error. Note that too much
position loop proportional gain (
Pp
) might cause oscillation.
1
On the
Gains
tab, set velocity feed forward (
Vff)
and acceleration feed forward
(
Aff)
to zero.
2
On the
Profile
tab, click
Start
. On the
Gains
tab, adjust position loop proportional
gain (
Pp
) until best result is obtained.
3
Click
Start
after each adjustment to test the new value on a new profile move.
NOTE: If a following error occurs, open the CME 2
Control Panel
(
) and click
Clear
Faults
.
5.13.2.4
Adjust velocity feed forward (Vff):
Velocity feed forward (
Vff)
reduces following error in the constant velocity portion of the
profile. Often, a velocity feed forward (
Vff)
value of 16384 (100%) provides best results.
1
Click in the
Vff
field and adjust the value.
2
Click
Start
after each adjustment to test the new value on a new profile move.
5.13.2.5
Adjust acceleration feed forward (Aff):
Acceleration feed forward (
Aff
) reduces following error during profile acceleration and
deceleration.
1
Click in the
Aff
field and adjust the value.
2
Click
Start
after each adjustment to test the new value on a new profile move.
NOTES:
1
If, after tuning the position loop, the motor makes a low frequency audible noise
while enabled but not moving, the velocity loop gains (Vp and Vi) may be lowered
to reduce the noise. If the gain values are set too low, the response to
instantaneous rates of change might be reduced (i.e., slow correction to
disturbances or transients).
2
If the amplifier is set up to run in position mode under analog input command, and
the analog command signal produces too much noise at the motor after tuning, the
Velocity Loop Command Filter may be used to reduce the noise further. See
Velocity Loop Filters (p. 167).
5.13.2.6
Tune to multiple sets of profiles representing typical moves that might be executed in
the application. Starting with
Set up a trapezoidal profile
, repeat the process as
needed.
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