Flexible controlling and monitoring of DC motors

The new control system for DC motors from KALEJA Elektronik offers to users a low-cost solution to electronically drive and monitor direct current motors. Fast assembly is ensured due to the modular design which can be snapped onto the DIN rail as well as the plug-on spring-loaded terminals. The control system has been designed for reversing operation. The motor speed can be controlled from 0 to maximum speed via an analog 0–10VDC input. A reference voltage of 10VDC is provided by the control system and thus it is very easy to connect a potentiometer for speed control. A trimmer at the front of the control system is used to set the maximum motor current. If the motor current increases above the set value, the module switches off the motor under dynamic braking and a signal is transferred to the terminal I-out. To prevent the current evaluation from responding during the start of the motor, a fixed time (approx. 300 ms) is active.

An additional trimmer is integrated at the front to enable flexible handling of the over-current switch off. This trimmer is used to set the time (0.2 s to 2 s) until the over-current is switched off. If the motor current returns to the normal value within the time set, the control system does not switch off, but switches off only when over-current is reached the next time. A measuring point has been installed at a connection terminal to set the maximum motor current at the trimmer always at the same value for serial production. The setting can be read off at a voltmeter and balanced at the trimmer.

The structural width of this flexible control system is only 22.5 mm.
 

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