Product Description:

The FC-101P18KT4E20H4 is an AC variable frequency drive produced by Danfoss and supplied under the VLT FC 101 HVAC Basic Drives series. Designed for motor speed control in ventilation, pumping, and compressor circuits, it converts fixed-frequency mains power into a regulated output that allows building-management systems to match fan or pump speed to real-time load demands. Adjusting motor speed according to demand can lower energy use and reduce mechanical stress on connected equipment. The unit is intended for cabinet installation in commercial or light-industrial HVAC plants where variable-air-volume systems or chilled-water circulation requires precise speed adjustment.

The electrical section has a continuous output power rating of 18.5 kW, making the drive suitable for centrifugal fans used in medium-sized air-handling units. It accepts an input supply range of 380-480 VAC, so it can connect to common 400 V or 460 V distribution systems without an autotransformer. The drive operates from three-phase mains power, allowing the rectifier bridge to reduce current ripple and distribute heat across the power devices. At the motor terminals, the drive supports an output of up to 25 HP, accommodating standard NEMA or IEC induction motors in the corresponding power range. The IP20 enclosure blocks access by finger-sized objects but remains open to ambient air. Therefore, the drive must be installed inside a suitable protective control panel that provides appropriate protection from moisture, dust, and accidental contact.

Electromagnetic compatibility is supported by an integrated filter that meets RFI class A1 (C2), reducing conducted electrical noise on the supply lines. This filtering allows the unit to operate near building-management communication networks while limiting interference with connected equipment. The numeric identifier 101 indicates a basic feature set intended for pump and fan profiles rather than general-purpose motion control. Its control functions focus on common HVAC requirements, including variable-air-volume systems, return-air fans, chilled-water circulation, and booster pumps. The streamlined parameter structure makes configuration and troubleshooting more direct while retaining the controls needed to regulate motor speed in response to changing system demand.