14.F4.C1E-4F21 KEB
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The KEB 14.F4.C1E-4F21 is part of the F4 Combivert Frequency Inverters series and has a compact control mode along with an E-size housing style. It supports a maximum rated motor power of 7.5 kW and features a braking transistor as an integrated accessory. This inverter has an InterBus fieldbus option and an IP20 protection rating, operating in temperatures from -10 to 45°C with up to 95% relative humidity.
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Product Description:
The 14.F4.C1E-4F21 is a frequency inverter produced by KEB within the F4 Combivert Frequency Inverters series. As a COMBIVERT F4 unit, it converts fixed-frequency mains power into a regulated output that lets controllers vary the speed of three-phase induction motors used on conveyors, pumps, and general machinery. By matching motor torque to process demand, the device helps improve energy efficiency and motion accuracy in automated lines.
The inverter is built around a Compact control mode that combines power electronics and logic on one platform to minimize panel space. For networked installations, it supports the InterBus fieldbus, allowing status words and setpoints to travel over a single twisted-pair backbone without external gateways. The frame uses an E-size housing, so its mounting dimensions and heat-sink clearances match those of other drives in the same size class. An integrated braking transistor is included; this semiconductor switch lets excess regenerative energy flow into an external resistor during rapid deceleration instead of returning it to the DC link. The power stage is rated for motors up to 7.5 kW, establishing the maximum continuous mechanical load that can be driven at the nominal voltage and carrier frequency.
The unit operates in ambient temperatures from -10 to 45 °C without derating. Its IP20 enclosure guards against accidental contact with live parts while remaining open to forced-air cooling inside a control cabinet. Pulse-width modulation operates at a carrier frequency of 4 kHz, balancing acoustic noise with switching losses. The electronics and power components remain stable at up to 95% relative humidity when condensation is avoided, making the drive suitable for humid production areas such as food-handling or textile-processing facilities.
