|The ACT series drive delivers the features and benefits of a microprocessor based drive and the low cost of a triac control. The ACT output is a variable voltage with a constant frequency, making it perfect for a small speed range control of a single phase AC motor, such as a permanent split capacitor (PSC), shaded pole, synchronous, and universal motors. Unlike other common triac drives, the ACT series drive takes advantage of single phase motor characteristics to provide approximately constant pressure in filtered fan applications, meaning as a filter becomes clogged, the motor will speed up to maintain airflow. The ACT series drive also has an internal closed loop circuit meaning the drive can maintain motor voltage during AC line sags or swells. It also accepts feedback in the form of a thermistor or voltage signal to create a PI loop.