HVAC Intelligent Control
VLT HVAC Drives include a PID controller with four setpoints and three feedbacks, a feature not offered anywhere else in the market. The built-in combination of HVAC system control features and flexible I/O result in the highest level of control possible at the lowest overall cost of ownership.
Four on-board, self-tuning PID controllers can operate as an entire air handling unit controller. One PID maintains fan speed while up to three other PID loops can be used to operate other HVAC devices.
In pump applications, short-cycle prevention allows maintained operation within a desired range without the wear and tear produced by system overstarting. Combined with a flowmeter or a differential pressure transmitter, the VLT HVAC Drive can measure and regulate flow and replace throttling valves for more accurate control and energy savings.
Fan tracking allows return fans to maintain the desired pressure by utilizing two air flow sensors. An enhanced sleep mode saves energy and system wear by shuttting down fans during idle periods.