EM Series Drive Hardware Installation Manual
12
HWMN-EM-R20111018
Auto Configuration
If a non-Leadshine stepper motor is used in your system, switch SW3 (EM402) or SW4 (others) two times in one second to activate
Auto-configuration for optimized performance if it is first time installation. Make sure the motor selection switch is set to one of the
custom motor position. During Auto-configuration, motor parameters are identified and the EM drive’s current loop parameters are
calculated automatically. The motor shaft will vibrate a little during the process of Auto-configuration which takes about 1 to 3 seconds.
Every time motor or supply voltage is changed, Auto-configuration should be performed once again. Sometimes the result of the
Auto-configuration is not very good. This happens when the stepper motor has large inductance or resistance. In such situation a further
tuning of current loop via the RS232 communication port is required. Please refer to the EM drive’s software operational manual for
more information.
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:
Microstep
solution
Microstep
×
=
200
Re
The motor speed can be calculated as follows:
solution
Microstep
Frequency
Input
Pulse
RPS
Speed
Motor
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.
SW3 SW3 SW3
SW4 SW4 SW4
Summary of Contents for EM Series
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