Digital Stepper Drive Hardware Installation Manual
Auto Tuning by SW4
To get the optimized performance, switch SW4 two times in one second to identify the motor parameter after power-up if it is the first
time installation. The motor parameter is identified and the drive’s current loop parameters are calculated automatically when SW4 is
activated. The motor shaft will have a little vibration during auto-configuration. If the user changes the motor or the power supply, don’t
forget to activate SW4 once again. Sometimes the result of the auto-configuration is not good. This will happen to the stepper motor
with large inductance or resistance. The user needs to tune the current loop parameter manually. Please refer to the software manual of
the DM drive.
Auto tuning:
Switch SW4 two times in one second.
Microstep Resolution Selection
The stepper motor moves one step when one pulse is applied to the stepper drive. If microstep is 1, the step angle is a full step which is
1.8 degree for 2-phase stepper motor and 1.2 degree for 3-hpase stepper motor. Microstep can be taken as the divisions of one full step.
For example, stepper motor moves half of the full step when the microstep is 2. For 2-phase stepper motor and drive, we have the
following formula to calculate the microstep resolution, or pulse counts of one motor shaft revolution:
MicrostepsolutionMicrostep 200Re
The motor speed can be calculated as follows:
solutionMicrostep
FrequencyInputPulse
RPSSpeedMotor
Re
)(
When selecting the drive’s microstep resolution for the system:
Consider the MAX speed needed, MAX input frequency of driver and MAX output frequency of the controller.
1600 pulses/revolution (8 Microstep) is suitable for most application.
>1600 pulses/revolution only increase smoothness but not resolution.
For digital driver, Microstep resolution is not important.
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