The Q-link Variable Frequency Drive provides a revolutionary user experience through it's intuitive iOS and Android smartphone apps. The Q-link connects to your smartphone via Bluetooth® and allows for guided start-up, automated reports, in-app support, and more. It provides an array of inputs and outputs including damper control. Native communications include BACnet and Modbus. The Q-link uses R³ Filtering – a sophisticated filtering algorithm – to reduce harmonic distortion and provide equivalent performance to an AC line reactor, without the added cost.