On/Off Digital Potentiometer. On/Off digital potentiometers are designed for controlling the speed and direction of a motor as a control panel for V/F speed controllers. They are easy to use and can be used in many applications with their ramp properties. 4 Digit display Easily adjustable set value from front panel Configurable display scale between -1999 and 9999 Adjustable decimal point Set value low ; high limit boundaries Adjustable ramp up ; ramp down time Forward, reverse direction outputs and error inputs for V/F speed controller Password protection for programming and adjustment sections