Product Description:

The 14.F4.S1E-3440 is a frequency inverter built by KEB for the F4 Combivert Frequency Inverters series. It converts fixed-frequency three-phase mains power into a variable output that allows precise speed regulation of induction motors used in conveyors, pumps, and other automated machinery. By integrating drive, brake, and protection functions into one enclosure, the unit simplifies cabinet layouts and streamlines commissioning in industrial automation lines.

The inverter is designed for a 400 V class network and accepts three-phase power, drawing a nominal input current of 18.1 A. Inside, an internal brake transistor dissipates regenerated energy through an external resistor, preventing DC-link overvoltage during rapid deceleration. Output capability reaches 11 kVA, supporting motors up to 7.5 kW while limiting line loading through a selectable 50 Ω minimum or 85 Ω typical braking resistor. A 4 mm² line cross section accommodates copper conductors sized for the drive’s current, and the IP20 protective system allows installation in ventilated electrical rooms where touch-safe shielding is already provided.

The output stage delivers a continuous current of 16.5 A and is safeguarded upstream by a 25 A mains fuse. Carrier modulation can be set to a maximum switching frequency of 16 kHz, with an 8 kHz rated value used to balance acoustic noise and semiconductor losses; at this setting, total power loss is 240 W, which must be removed by panel airflow. Environmental limits include 95% relative humidity without condensation, ensuring the control electronics remain stable in humid production areas. When system braking is required, the factory-mounted transistor energizes the resistor circuit automatically, and the unit will shut down if the brake path is open. All terminals remain within reach behind the cover, and the drive’s design supports quick fuse replacement and straightforward field wiring.