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EM-115 motor control unit is designed for big permanent magnet DC-motors. The power control is done with PWM method (Pulse Width Modulation). This facilitates high efficiency and small temperature losses. Thanks to a high switching frequency the unit operates quietly. A battery or a filtered DC-supply will do as a power source.


The maximum output given by the unit depends on the installation. When operating at maximum power output sufficient air ventilation has to be taken care of. The unit operates in 4-quadrants so it drives and brakes in both directions. The braking is done with regenerative way feeding braking energy back to power supply. When a battery is not used as a power source the braking energy will be fed to the internal resistance of the motor. The motor rpm can be set either with potentiometer, trim or external voltage signal. The output acceleration ramp and current limit are set with trims, the current limit is indicated with a red LED. A load affecting the motor rpm can be eliminated with a compensation trim. The power stage is protected against voltage peaks, overload and temporary shortcuts. Even the incorrect polarity does not damage the unit as long as a fuse of recommended value is used.



Technical data

Supply voltage  12...36 Vdc
Idle current  < 50mA
Recommended fuse  5-30A
Control potentiometer  1k..50k
Load capacity  25A RMS
  50A mom. (5s)
Motor voltage  0-30V
Control voltage range  from 0-5V to 0-10V
Voltage loss  /V
Current limit  4..50A
Operating frequency  approx. 21kHz
Ramp time  0.3..10s
On / Off control  > 4V “on”
  < 1V “off”
Input impedance  pins 6,7 and 8 = 10kohm
  pin 9 = 100kohm
Efficiency  >92%
Operating temp.  -10..50 °C
Dimensions  107*107*45 mm
Weight  approx. 270 g

Product files


  • 22 pcs. in stock
Product not available for online order.