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105,00 € /unit

ENDING PRODUCT, not for new designs

EM-186-72 is bipolar-chopper type stepper motor controller. Bipolar operation suits most stepper motors and provides the best torque. The microstepping feature gives high performance also at low rpm. The power stage is mosfet-type so it runs with very high efficiency.

There are four stepping modes: full, half, quarter and eighth. Desired mode is set with two control inputs. The phase current ( current limit ) can be set in eight different levels using dip-switches. A wide phase current set range makes it possible to use the device with several different motors. Automatic power reduction will drop phase current when stepping pulses stop coming.

The controller features an auxiliary oscillator, which has 7 preprogrammed frequencies. The frequency is set with three control inputs. Auxililary oscillator in EM-186-72 has also an acceleration ramp feature, which can be used to change frequencies flexibly, so that the motor will start up reliably even at high frequencies. The acceleration ramp time is set with a trim.

The inputs operate with so called positive logic, in other words the inputs are activated with connecting the input to positive voltage. The inputs also work with TTL-logic level control.



Technical data

Operating voltage 20-80Vdc
Idle current approx. 25mA (enable "0")
Current set 0,8; 1,4; 2; 2,6
  3,2; 3,8; 4,4; 5,0A
Voltage loss 1V when Im=1A
Aux. osc. freq. 200, 500, 1000, 2000 Hz
  3000, 5000, 8000 Hz
Ramp speed 0,2...3s (0...8000 Hz)
Aux. freq. Precision better than 0,5%
Digital control ON, Uin 4 -30V
  OFF, Uin 0-1V or open
Stepping options 1,1/2,1/4,1/8 step
Power reduction -70%
Power reduction delay 100ms from last pulse
Step freq. max. 15 kHz
Operating temp. 0-50°C
Dimensions 90x107x30mm
Weight approx. 180g

Product files


  • 14 pcs. in stock


  • 105,00 € /unit