DM442 Digital Stepping Drive Manual V1.0
Tel: +000 0000-00000000 26
out of control. The optimal value depends on the system, and the default value is 3000.
Idle Current: Standstill Current when motor stop. When the motor stop time exceeds the Idle
Time, the motor coil current reduces to Idle Current (In percentage). The percentage is rated to the
Peak Current.
Idle Time: See Idle Current.
Pulse Filter Enable: Click the check box will turn on the internal pulse smoother or filter of DM442.
Directi
onDef: Direction Definition. Relate the default running direction to a HIGH level input in
DIR or Low level input in DIR. This panel is used for PUL/DIR command type only. Please note that
the default direction is also related to motor coil connections.
CommandType: Command Type of control signal, including PUL/DIR and CW/CCW. Set this
parameter according to Command Type of motion controller.
ActiveEdge: Active Edge. The user can set
the triggered edge of pulse command signal in this panel.
When the drive works in CW/CCW mode, no matter what level is at fixed level terminal, the drive can
works properly.
Anti-Resonance Introduction
Step motors are highly resonant, which results in vibration and ringing. The ringing utilizes a large
fraction of the motor's available torque ā thereby wasting performance. Furthermore, at mid-range
velocities, the reson
ance can become so severe that the motor looses synchronization and stalls. The
DM442 drive provides robust anti-resonance control to stop the vibrations and maintain equilibrium.
This feature requires that the drive be configured with respect to the total inertia in the system. If set
improperly, the effectiveness of the feature may be diminished.
The user can invoke or disable the feature by setting Amp and Phase valu
es in SystemConfig
window. Amp and Phase values all zero is to disable the feature, otherwise is to invoke the feature. It
should be enabled unless the system configuration either does not need it or cannot tolerate it. A
system with loose couplings or viscous loading generally does not need this feature. If a system has
compliant (springy) coupling and is absent appreciably viscosity, it may not respond well to the active,
DM442 Digital Stepping Drive Manual V1.0
Tel: +000 0000-00000000 27
anti-resonant loop in the drive. The anti-resonant feature is not designed to damp such a 4
th
order
system. If the application of anti-resonance results in degradation or instability, it should be disabled.
1
st
ResonanceArea: Parameters for 1
st
resonance area. It is usually between 0.6rps and 1.2rps.
Amp1 is Amplitude adjustment for 1
st
resonance area.
Phase1 is Phase adjustment for 1
st
resonance area. The user can enter a value directly in the text box
or move the slider bar back and forth to get an optimum value.
2
nd
ResonanceArea: Parameters for 2
nd
resonance area. It is usually between 1.2rps and 2.4rps.
Default Amp2 and Phase2 values are zero.
3
rd
ResonanceArea: Parameters for 3
rd
resonance area. It is usually between 2.4rps and 4.8rps.
Default Amp3 and Phase3 values are 128.
Internal Pluser( Pulse Generator)
The internal pulse generator offers a s
imple motion control for self-test and anti-resonance tuning. The
user can adjust moving velocity, configure the direction and repeats of the motion.
Bidirectional: Click the check box to make the motion be bidirectional. Otherwise the motor only run
in one direction.
Positive: It is used to change the initial direction for the motion.
Interval: Stop time before the next motion repeat. Unit: ms.
Repeats: Motion repeat times. If it
is bidirectional, one repeat is moving forward then back.
Distance: Moving distance in one direction in revolution.
Start/Stop: Start/Stop the motion.
Note
:
When you adjust the velocity by moving the slider forth and back, the motor velocity would not
change immediately as you expected. That is because the drive only read the new speed when it
changes direction. Also be careful about the initial direction and moving distance if the motor is
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