Product Description:

The FC-301P37KT4134F4846 is an AC variable-frequency drive manufactured by Danfoss for the VLT FC 301 Automation Drives series. It converts fixed three-phase mains power into a regulated output for industrial automation systems. This conversion allows controllers to adjust motor speed and torque according to mechanical demand while reducing energy use and thermal stress on connected machinery.

This drive accepts a line supply of 380 – 480 VAC on a three-phase network and delivers up to 37 kW, corresponding to 50 HP, of continuous shaft power. A conversion efficiency of 0.98 minimizes electrical losses, and the design tolerates a maximum phase imbalance of 3.0% to maintain stable current distribution across the input rectifier. During dynamic braking, the active DC link is clamped at 778 V DC, protecting the bus capacitors when the motor regenerates energy. The analog terminals supply 10 V at 15 mA for potentiometer reference signals and 24 V at 200 mA for sensor excitation. One changeover relay is included, and its contacts are rated for 240 V AC at 2 A for AC-1 duty and 60 V DC at 1 A for DC-1 duty. These relay contacts can directly control contactors or alarm lamps in the connected system. The control logic permits one power-up per minute, which helps prevent inrush-related stress on the electrical supply.

An overvoltage alarm activates at 820 V DC, while a high-voltage warning appears at 810 V DC so the controller can decelerate the motor before a shutdown occurs. The internal series identifier is 301, placing the model within the VLT AutomationDrive FC product group and its associated control and parameter structure. A Type B USB service port with USB 1.1 support provides a local connection for configuration and data logging. This integrated port eliminates the need for a separate programming adapter inside the cabinet. Local access also allows drive settings and operating records to be transferred through a standard service connection.