ebm-papst Manual 0-10V EC Fan Controller with Display. Suitable for use with the full range of ebm-papst EC fans the RM-ECd controller provides infinitely variable, manual speed control between 0% and 100%. The control voltage 0-10V is displayed on the LCD for ease of commissioning. RPM can be displayed if a tacho fan is used.. Powered by 10V DC output from the motor. Can Control multiple fans running at the same speed. Infinitely variable speed setting. LCD screen showing 0-10V or RPM. Pulses / rev selectable using DIP switch. Cable entries 4 x M16 or M20. 4mm mounting holes. No separate power supply required.