Product Description:

The FC-101P4K0T4E20 is an AC variable-frequency drive produced by Danfoss for the VLT FC 101 HVAC Basic Drives series. In ventilation and pump systems, the unit modulates motor speed so that air-handling fans or centrifugal pumps deliver the flow requested by the building automation system. Matching motor speed to demand reduces energy drawn from the mains and limits unnecessary mechanical wear on connected equipment.

The electrical power section is rated at 4.0 kW, representing the maximum continuous real power that the converter can pass to the motor terminals under rated operating conditions. The mains input accepts 380–480 VAC, allowing direct connection to common low-voltage distribution systems used in commercial and industrial buildings. Operation requires a three-phase power supply; a single-phase source is unsuitable because it would cause excessive ripple in the DC-link capacitors. The IP20 protection rating guards live components against contact by fingers and similarly sized objects. Because the open enclosure does not prevent the entry of dust or dripping water, the drive must be installed in a suitable cabinet that provides the necessary protection for the operating location.

The drive uses a chassis form factor that supports compact panel mounting without additional sealing hardware. Its narrow arrangement helps preserve cabinet space for contactors, circuit protection, control terminals, and other equipment used in fan or pump applications. The control package identified by 101 is intended for basic HVAC functions rather than the rapid motion profiles associated with high-dynamic machinery. Integrated PID functionality allows the drive to regulate variables such as static air pressure, water pressure, temperature, or flow by adjusting motor speed in response to process feedback. A building controller can provide an analog reference while the internal control loop maintains the requested operating point as system demand changes.