Product Description:

The 14.F4.C1G-M480 is a frequency inverter produced by KEB for the F4 Combivert Frequency Inverters series. It converts fixed-frequency line power into a variable output that regulates three-phase induction motors used in conveyors, pumps, and general automation. By modulating voltage and frequency, the unit supports controlled acceleration, stable speed holding, and efficient braking within compact control cabinets. This type of drive is useful where motor speed must be adjusted electronically instead of by mechanical throttling or fixed-speed operation.

The inverter delivers an apparent output of 11 kVA, matched to a mechanical motor rating of 7.5 kW. At rated load, the drive supplies 16.5 A on the motor side while drawing 18.1 A from the incoming line, and it is protected by a 25 A line fuse. Conductors up to 4 mm² can be landed on the terminals and tightened to 1.2 Nm for secure current-carrying connections. The housing has an IP20 protection rating, so it is intended for installation inside an enclosed panel. Internally, the IGBT bridge switches at 16 kHz, and at this carrier frequency the stall current limit is 12 A to keep the semiconductors within their thermal range. Continuous operation dissipates 260 W as heat, so cabinet airflow must remove that heat to limit internal temperature rise.

Dynamic stops are handled through the integrated brake chopper, which can sink up to 21 A. It requires an external resistor no lower than 39 Ω so regenerated energy can be absorbed without excessive power density in the braking circuit. For rapid torque transients, the output stage tolerates a short-time current of 24.8 A, and the electronic protection trips at 29.7 A if an overcurrent persists. The heat sink must remain below 90 °C, which helps protect power components during repeated deceleration cycles and changing load conditions.