Product Description:

The 18.F4.F1H-4R01 is an AC frequency inverter produced by KEB within the F4 Combivert Frequency Inverters series. By modulating the output frequency and voltage of the mains supply, the unit lets control systems vary induction motor speed in conveying, pumping, or positioning equipment. In plant layouts, it sits between the three-phase supply and a motor, converting a fixed 50/60 Hz input into a regulated output that matches real-time process demands while providing built-in braking and protection functions.

The inverter is designed for motors rated up to 22 kW; at that load, the device draws a nominal input current of 55 A from the line. The line terminals accept 25 mm² conductors, and a maximum mains fuse of 80 A protects the upstream circuit. The power electronics dissipate 610 W as heat, and the housing has an IP20 protection rating, so it must be mounted in a closed cabinet. The 3K3 climatic category indicates suitability for ventilated control rooms rather than outdoor service. The motor side provides 50 A of continuous output current, and overcurrent protection trips at 90 A. When the carrier frequency is set to 8 kHz, the stall current limit is 45 A; at 16 kHz, that limit falls to 20.3 A. A typical 20 Ω braking resistor absorbs energy during deceleration.

The drive can supply a maximum short-time current of 75 A without immediately cutting out during brief overloads. Its integrated chopper allows a maximum braking current of 63 A. For safe thermal operation, the braking circuit requires a dump resistor with a resistance of at least 13 Ω, so the unit trips if a lower resistance is connected. At the motor terminals, the inverter can deliver an apparent power of 35 kVA, providing headroom for high-torque transients on 22 kW machines. The available overload capacity supports controlled stops and rapid dynamic reversals while keeping semiconductor temperatures within acceptable limits.