
1336S-B075-AN-EN A-B Processor module
VFDs like the Allen-Bradley PowerFlex series are employed anywhere we need to vary the speed of an AC motor on the fly. Some of the most common application areas include: Pumps and Fans (HVAC and Fluid Handling): Perhaps the largest use-case for VFDs is controlling centrifugal pumps and fans. HVAC systems (building air handlers, cooling tower fans, chilled water pumps, etc.) frequently use VFDs to adjust airflow or water flow to match heating/cooling demand. Instead of running a fan at full speed and using dampers to restrict flow (which wastes energy as pressure drop), a VFD can slow the fan to deliver just the required CFM of air. Energy savings of 20– 50% are routinely achieved in such systems by eliminating throttle losses . For example, a large luxury hotel in Dubai retrofitted VFDs on its air handling units and saw about 25% reduction in HVAC energy consumption while maintaining guest comfort . Similarly, municipal water and wastewater facilities use VFDs on pumps to closely match pump output to the target flow/ pressure, avoiding the need to bypass flow or ride pump curves at inefficient points. Beyond energy savings, using VFDs on pumps and fans reduces mechanical stress: pressure surges (“water hammer”) are minimized by gentle ramp-up/ramp-down, and there is less wear on valves and damper actuators. Maintenance personnel also note that pump seals, bearings, and fan belts last longer when high startup torques and pressure shocks are eliminated.
The structure and details of the product:
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