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EM-243A is a full bridge DC-motor starter. It is designed to work with DC-motor in applications where some special functions are needed. Starter has adjustable acceleration and deceleration ramps, which make possible the smooth starts and stops. Adjustable current limit protects motor against overcurrent and it can also be used as an end-stop. This device has also two settable speeds, which are usefull in positioning applications. Control inputs FW and BW start the forward and backward run. STOP is for the motor shut-down but there are also available individual limit inputs for FW and BW directions. SPEED-2 input activates preset speed-2, but it can also be used as input for analog speed control signal 0-5V. FAULT terminal has at the same time input and output function, the pin is normally high, but is pulled down in overheat and conditionally also in current trip situation. If FAULT-line is pulled down externally it will cause a stop and prevent the new start. For example, it is possible to link fault pins of several units together and achieve a syncronous stop.

There are 2 selectable control modes, contionuous and impulse. In continuous mode the motor runs as long as the control is active. In impulse mode a short comand starts the motor, and only a new impulse will change the status. The card has selectable input logics. Inputs are divided in two groups, control and limit -inputs. Groups can be individually set for NPN or PNP logic. The parameters are set with EM-236 interface unit. Operation of the controller and some of its functional values can also be monitored with EM-236 interface unit.



Technical data

Supply voltage 12-42V, limits 10-55V
Start up voltage 9V
shutdown voltage 8V
Idle current typ 15mA
Motor current  
max. continous 50A ( at 25°C amb temp),
40A ( at 60° amb temp ) and peak 100A ( 5s )
Current limit adj. 1-100A (at start x1.5)
Overheat limit 100°C
Start and stop ramp adjustable 0-5s
PWM frequency 2kHz
Speed input scale ( speed-2 )
  0-5V = 0-100% pwm
Input control logic: high =4-30V
Control input impedances typ. 10kohm
Control input response time typ 5ms.
Fault out. NPN open coll.
  max 50V /1A
Fault in actives Uin < 1V ( NPN )
Motor and supply connectors 2.5mm
Control connectors 1mm
Dimensions 107x72x25mm
in DIN-rail base 110x80x45mm
CE-tested for industrial environment ( EMC )
Operating amb. Temp ( Ta ) -40...60°C
Weight 190g

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