22.F4.F1R.3440 KEB
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The KEB 22.F4.F1R.3440 is a frequency inverter in the F4 Combivert Frequency Inverters series with a nominal power of 80 kVA and motor power rating of 55 kW. It supports a nominal input current of 127 Amps and is built with a field-oriented control type and an 8 kHz carrier frequency. This model features a braking transistor, has an IP20 protective system, and is designed for 400 V three-phase supply.
Internal Product Review
The 22.F4.F1R.3440 is a KEB F4 Combivert frequency inverter with field-oriented control and a 400 V class supply. A 55 kW motor rating and 115 A nominal output current give the drive strong capability in demanding motion and process applications. IP20 protection adds practical cabinet suitability for a well-engineered inverter.
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Product Description:
The 22.F4.F1R.3440 is a frequency inverter produced by KEB for the F4 Combivert Frequency Inverters series. It modulates three-phase power for operating induction or synchronous motors under field-oriented control. This control method provides precise speed and torque regulation in automated machinery and process equipment.
The model uses pulse-width modulation at a carrier frequency of 8 kHz, which reduces audible motor noise and improves current fidelity. Its inverter section supports a motor output of up to 55 kW. The input stage has a nominal line current of 127 A, while the output stage continuously delivers 115 A. These electrical ratings correspond to an apparent power capability of 80 kVA. A built-in braking transistor diverts regenerative energy into an external resistor, allowing the drive to decelerate high-inertia loads without causing a DC-bus overvoltage condition. The field-oriented control algorithm works with shielded motor leads up to 50 m long and maintains dynamic regulation during short-term increases in current demand.
Installation requires a mains fuse rated no higher than 160 A to protect the upstream supply. An overcurrent trip threshold of 207 A protects the inverter against phase faults and excessive current. The power stage withstands a short-term current of 172.5 A for one minute, accommodating process surges and acceleration peaks without an immediate shutdown. The IP20 enclosure restricts access to live parts while permitting the airflow required for cabinet cooling. The unit connects to three-phase grids in the 400 V supply class. Feeder cables with cross-sectional areas up to 50 mm² can be connected to the terminals. A typical 8.6 Ω external braking resistor dissipates excess DC-bus energy during controlled stops.
