Product Description:

The 15.F4.S1E-3420 frequency inverter is manufactured by KEB for the F4 Combivert Frequency Inverters series. In an automation cell, it adjusts motor voltage and frequency, allowing motor speed to vary without mechanical gear changes or throttling losses in fans, pumps, and similar driven equipment. The device is supplied with a braking transistor for controlled deceleration, and it uses a standard control topology inside the compact E-type housing for straightforward cabinet integration in enclosed drive panels.

Electrical ratings center on the 400 V Class mains category. The unit connects to a three-phase supply through terminals sized for 6 mm² conductors, and the nominal input draw is 26.5 A. Internally, an IGBT bridge chops the DC link at a switching frequency of 4 kHz and delivers an output nominal current of 24 A to the connected motor. That current supports an apparent power of 17 kVA, corresponding to a maximum rated motor load of 11 kW. Because the control scheme is standard, no additional option boards are required to issue speed commands or read diagnostic data.

Transient and protective values set the operating limits. For short acceleration bursts, the inverter can provide 36 A, while the overcurrent trip activates at 43.2 A to protect the power stage. A 35 A mains fuse is recommended so upstream wiring clears faults before semiconductor damage occurs. Continuous switching generates 260 W of power loss, and this heat must be removed by panel airflow to keep silicon junctions within allowable limits. At the motor terminals, the carrier waveform reaches a maximum fundamental frequency of 12 kHz, allowing high-speed spindle or blower operation where elevated output frequency is required. The accessory braking transistor diverts regenerated energy during deceleration, and the standard control maintains stability even when line cross-section or fuse values vary within approved tolerances.