Anti-Resonance Introduction - Leadshine Technology DM422 User Manual

Figure 24: Finish tuning and save setting to the driver
Notes:
However, if the user does not want to tune the current loop after changing a different stepping motor,
then Motor self-test and parameter auto-setup technology of the DM422 can replace manual tuning
the driver with ProTuner. Just changes SW4 two times in 1 second, and then the driver will
auto-identify the new motor and auto-configure related control parameters for optimum responses.
Recommend use this function after changing the driven motor.
SystemConfig:
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In SystemConfig window, the user can configure Peak Current, Microstep, Command Type, Active
Edge, and eliminate motor resonance. A built-in pulse generator can be used for test during tuning.
See Picture 25.
PeakCur: Peak Current. The value is the peak current to the selected motor and can be set from 0.1
to 3.2 A. The user can set the peak current with ProTuner or DIP switches, see more information
about setting output current of the driver in section 5 "Connecting the Motor" and section 7
"Selecting Microstep Resolution and Driver Output Current".
MicroStep: Microstep Resolution. The value is driver's microstep resolution setting and can be set
from 1 to 512. The user can set the microstep with ProTuner or DIP switches, See more information
about setting output current of the driver in section 7 "Selecting Microstep Resolution and Driver
Output Current".
StepAngle: Step Angle. The driver will auto detect the Step Angle of the driven motor.
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DM422 Digital Stepping Driver Manual V1.0
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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 driver works in CW/CCW mode, no matter what level is at fixed level terminal, the driver
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 – thereby wasting performance. Furthermore, at mid-range
velocities, the resonance can become so severe that the motor looses synchronization and stalls. The
DM422 driver provides robust anti-resonance control to stop the vibrations and maintain equilibrium.
This feature requires that the driver 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 values 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,
anti-resonant loop in the drive. The anti-resonant feature is not designed to damp such a 4
system. If the application of anti-resonance results in degradation or instability, it should be disabled.
st st
1 ResonanceArea: Parameters for 1 resonance area. Usually between 0.6rps and 1.2rps.
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Amp1 is Amplitude adjustment for 1 resonance area.
st
Phase1 is Phase adjustment for 1 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.
LowerLimit is the Lower Limit of the 1
finds it during move the slider bar of internal pulse generator.
st
UpperLimit is the Upper Limit of the 1
nd
2 ResonanceArea: Parameters for 2
Default Amp2 and Phase2 values are zero.
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DM422 Digital Stepping Driver Manual V1.0
st
resonance area, and the user can capture this value when
resonance area. Default Amp1 and Phase1 values are zero.
nd
resonance area. Usually between 1.2rps and 2.4rps.
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order