Tuning - HELIX DM422 User Manual

Read RAM: Read parameter settings from the driver's RAM to the ProTuner.
Write RAM: Write parameter settings from the ProTuenr to the driver's RAM.
Write EEprom: Write parameter settings from the ProTuenr to the driver's EEprom.
Reset Driver: Reset all parameter to default value.
Load configurations from a file
Save configuration to a file
Close this window.
Figure 22: Parameters configuration window

Tuning

The user can choose one or two drop-down menu(s) by clicking Tuning, including CurrentLoop and
SystemConfig.
CurrentLoop: In Current Tuning window, the user can tune the Kp (Proportional Gain) and
l
Ki (Integral Gain) of driver's current loop to optimize responses with different motors.
Start/Restart a Step Response test to get an optimum response.
Kp: Proportional Gain. Proportional Gain determines the response of the driver to current setting
command. Low Proportional Gain provides a stable system (doesn't oscillate), has low stiffness, and
large current error, causing poor performances in tracking current setting command in each step like
Figure 23. Too large Proportional Gain values will cause oscillations and unstable systems.
Toll Free 1-855-435-4958
DM422 Digital Stepping Drive Manual V1.0
22
Web Site: www.helixlinear.com
Figure 23: Current Tuning window
Ki: Integral Gain. Integral Gain helps the driver to overcome static current errors. A low or zero
value for the Integral Gain may have current errors at rest. Increasing the Integral Gain can reduce the
error. If the Integral Gain is too large, the systems may "hunt" (oscillate) about the desired position.
Start button: The user can start a Step Response test by clicking this button. Start/Restart a Step
Response test to get an optimum response like Figure 23, and remember to save the settings to the
driver by clicking Write EEprom in parameters configuration window when finish tuning .
Auto button: Click this button to auto-configure Kp and Ki for the connected motor. It has the same
effect as changing SW4 two times in one second.
Figure 24: Kp=356, Ki=15 (poor performances)
Toll Free 1-855-435-4958
DM422 Digital Stepping Drive Manual V1.0
23
Web Site: www.helixlinear.com