Product Description:

The 09.F4.S8D-3420 is a variable-frequency inverter produced by KEB for the F4 Combivert Frequency Inverters series. It accepts a 400 V-class, three-phase mains connection and synthesizes a regulated output waveform for AC motors, providing electronic speed control in packaging lines, material-handling conveyors, pumps, and general automation equipment that benefits from adjustable speed, softer starts, and controlled acceleration. By converting fixed grid power into variable voltage and frequency, the device reduces the need for mechanical throttling and interfaces with PLCs or stand-alone drive controllers through its compact heat sink housing and standard power connections.

A maximum heat-sink temperature of 79 °C is the thermal limit that must not be exceeded during continuous operation, so cabinet ventilation has to keep the cooling path clear. The inverter draws a nominal line current of 4.5 A from appropriately protected feeders that are fused at 10 A and wired with 1.5 mm² conductors, and on the motor side it supplies an output current of 4.1 A for machines whose connected motor is rated up to 1.5 kW. The IGBT bridge switches at a rated carrier frequency of 4 kHz, balancing acoustic noise and semiconductor losses while maintaining stable torque behavior across the speed range.

The output section delivers an apparent power of 2.8 kVA, and the drive's electronic protection trips when phase current reaches 9 A to help prevent damage during short circuits or stalled-rotor events. Short-time overload capability extends to 7.4 A, giving the motor additional accelerating torque for limited durations before thermal limits intervene and helping the inverter ride through brief load increases. Internal dissipation is limited to 60 W, so required cooling airflow stays moderate and external heat exchangers are often unnecessary in enclosed control cabinets. This combination supports steady operation where available panel space is limited and heat buildup has to remain under control.