Command Descriptions
93
drive software clamps the maximum allowable velocity command to the value set by
DMVLIM
. Bit 18 stays
latched until a
DCLRLR,
RESET
or
DRESET
is issued.
Changes to the
DMVLIM
command are not allowed while motion is in progress.
NOTE
: The Gem6K requires values in rotary units. Motion Planner does these conversions for you when
you use the Setup Wizard. If you do not use the Setup Wizard, you must convert your linear units to rotary
units. See the
DMEPIT
command for information on conversion.
Working with servo gains
.
•
Servo tuning process: refer to the
Hardware Installation Guide
.
•
Check the values of all active gains (
DMVLIM
is one of many servo gains): use
TGAIN
.
•
Creating and invoking gain sets: see
SGSET
,
SGENB
,
TGAIN
,
TSGSET
.
DNOTAD
Notch Filter A Depth
Type
Tuning
Syntax
<a_><!>DNOTAD<i>
Units
n/a
Range
0.0000 - 1.0000
Default
0.0000 (depth is zero)
Response
DNOTAD:
*DNOTAD.5
See Also
DMODE, DNOTAF, DNOTAQ, DNOTBD, DNOTBF, DNOTBQ, DNOTLD, DNOTLG,
DPBW, TGAIN, TSGSET
Product Rev
GT6K n/a
GV6K 6.0
(applicable only to
servo axes)
The
DNOTAD
command sets the depth for the commanded torque/force notch filter A. Setting this to 0
disables the filter. This command is useful in adjusting the maximum allowable attenuation and phase shift
through the filter. The deeper the notch depth, the more attenuation and phase shift. In general, the notch
depth is increased until the resonance is diminished. Increasing the depth further might increase the phase
shift to an unacceptable level and decrease the overall system performance.
There are two cascaded notch filters labeled “A” and “B”. Both filters operate in exactly the same way. The
diagram below shows the topology of these filters.
Velocity
Limit
Check
NOTCH
Filter A
NOTCH Filter
Command
Input Torque
Torque Command
(from Position Controller)
NOTCH Filter
Command
Output Torque
Lag/Lead
Filter
NOTCH
Filter B
Torque
Limit
Check
Actual
Torque
Command
The graphs below illustrate the transfer function for the magnitude and phase of the notch filter command
output torque/force vs. the notch filter command input torque/force. In this example, the notch depths are
set to .3, .6, and .9 (
DNOTAD.3
,
DNOTAD.6
,
DNOTAD.9
). The notch center frequency is set to 200 Hz
(
DNOTAF200
) and the “Q” is set to 1 (
DNOTAQ1
).
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