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SMD-4.2DIN ver.2

Stepper motor controller SMD-4.2DIN ver.2

Voltage 12 - 48 VDC
Max. current per phase 0.1 - 4.2 A
Microstepping 1/1 - 1/128
Control methods analog input to motor
speed or position control 0 – 5 VDC,
potentiometer, STEP/DIR,
constant speed rotation
Size 116x100x23 mm

The stepper motor controller is designed to control motors with current per phase up to 4.2 A. This model provides 4 control methods: STEP/DIR positioning, speed or position 0..5 VDC analog control, constant speed rotation. The controller provides an excellent motor dynamics and high torque performance.

technical data

Technical data

High voltage level 4 - 24 VDC
Low voltage level 0 - 1 VDC
Input STEP resistance 3 kOhm, no less
Inputs DIR and ENABLE resistance 1 kOhm, no less
Input current of control input STEP 1.4 - 4 mA
Input current of control inputs DIR и ENABLE 4 - 12 mA
Outputs «FAULT» parameters:  
Signal type opto-coupler output
Маx. voltage 48 VDC
Max. load current 50 mA
Resistance at close contact 100 Ohm, no more

Dimensions SMD-4.2DIN ver.2

Dimensions SMD-4.2DIN ver.2

Description of the stepper motor controller SMD-4.2DIN ver.2

With its advanced design, the SMD-4.2DIN ver.2 provides excellent dynamics and accelerates the stepper motor to over 1000rpm in a fraction of a second and easily reaches operating speeds in excess of 4000rpm while maintaining enough torque to do useful work.

For stepper motor applications with high load inertia, terminals for connecting an external braking resistor is provided.

The SMD-4.2DIN ver.2 controller provides both pulse position control and analog speed or angle control.

Stepper motor control modes

SMD-4.2DIN ver.2 provides three options for stepper motor control:

  • Pulse position control by external signals
  • Analog speed control mode
  • Analogue shaft angle control mode

Depending on the task, the controller can be used in one of the three control modes - pulse position control for implementation of positioning tasks, speed control with an analog signal - for tasks of accurately maintaining and regulating speed, setting the rotation angle depending on an external input signal (for example, to implement tracking or antenna positioning functions).

In pulse position control mode, it is possible to invert the enable signal EN. In the analog control mode, it is possible to set the smoothness of acceleration and deceleration.

The controller provides two options for stepper motor phases commutation:

  • Current phases control
  • Voltage phases control

In current phases commutation mode, the maximum current supplied to motor phases is controlled. This control mode allows connecting any stepper motor model with the maximum current setting in the controller. This control mode is characterized by great torque, high rotation speed, but is limited by the maximum microstepping value to 1/16.

Voltagephases commutation models are characterized by greater smoothness and the possibility of micro stepping devision up to 1/128. However, the speed and torque on the motor output shaft is lower compared to the current mode. For correct operation, precise motor parameters should be set to the controller.

Connection of the stepper motor controller SMD-4.2DIN ver.2

Using stepper motor controller SMD 4.2DIN ver.2 in speed control mode

Using stepper motor controller SMD 4.2DIN ver.2 in speed control mode

Example of connection diagram for analog speed control mode

Example of connection diagram for analog speed control mode

The analog speed control mode (by external or built-in potentiometer) provides start, stop, change of direction and smooth adjustment of the speed of rotation of the stepper motor without the possibility of precise positioning. The built-in generator is used as the controller that sets the pulses.

The analog speed control mode is used in cases of simple movement (rotation) of a stepper motor or when the use of an external source of pulses "STEP" is unacceptable or impossible.

Load movement control scheme using stepper motor and SMD-4.2DIN ver.2 controller

The figure below shows an example of a load movement control scheme using a stepper motor and a SMD-4.2DIN ver.2 controller. As a mechanism for linear movement, a lead screw (ball screw) with a carriage was used

The movement of the load along the screw is controlled by pressing and holding the buttons: SW1.1 - Forward and SW2.1 - Backward. A feature of this scheme is the limitation of movement, which is carried out using limit switches - SW 1.2 and SW 2.2.The limit switches break the motion control circuit through the action exerted on them by the moving carriage.

Connection example for load movement

Connection example for load movement

Parameters setting

In SMD 4.2DIN ver.2 controllers use USB connection to a computer for setting parameters.This method of setting becomes especially relevant with a large number of controllers. To configure the settings, the controller connects to the computer. External power supply is not required during configuration, 5 V from USB is enough to parameterize the controller, which makes this process quick and easy.

Parameters setting