Electronic speed control plarotronic®

plarotronic® is the precise electronic speed control for plaromaster® variable-speed gearboxes and combines the advantages of mechanical gear reduction with those of electronical systems. It processes universal setpoint setting as currency, voltage or field bus signal, enables the control of motors in stand-alone power systems and is flexibly programmable.

System description

The plarotronic® speed control can be compared systematically with a speed control of an electronical drive unit. Speed setting, that means the final control element, is not realized by means of an electronic actuator, but by mechanical change of gearbox geometry. This mechanical change results in a speed adaption on variable-speed gearbox output. If no electric remote control (EFB) is used, then mechanical change is realized by means of a hand wheel on so-called setting spindle. If the plarotronic® speed control is used, a setting motor is planned as final control element for the plaromaster® speed. Setting motor obtains the corresponding positioning order from controller to faster or to slower speed, that means turning to the right or to the left. In case of an adjusting command, speed changes as long as adjusting command is finished. Therefore, the final control element has an integral character. With the plarotronic® this is duly taken into consideration. The actual value of transmission output speed of plaromaster® variable-speed gearbox is collected by means of an incremental speed sensing system. Sensing time of speed depends on resolution and accuracy of speed setting respectively. Sensing time is 1 second with exact speed settings to +/-1 revolution per minute, as gearing of transmission output ring of variable-speed gearbox provides 60 pulses per revolution of output ring. This corresponds to 1 pulse per second during 1 revolution and 1 Hz pulse frequency respectively.

Technical data

Speed range: 1 to 1,200 rpm (50 Hz, without reduction gearbox)
Power range: 0.18 to 11 kW (motor power)
Temperature range: -20 to +115 °C (on variable-speed gearbox surface)
Accuracy: Speed setting +/-2 rpm
ATEX specification: Category 2, zones 1 and 21
Input signals: Speed reference value 0..10 V or 0/4..20 mA
Alarm signals: Block, Setting motor out of order
Bus signals: Activation reference value, Checking alarm signals