Product Description:

The 11.F4.C3D-3440 is an AC frequency inverter manufactured by KEB as part of the F4 Combivert Frequency Inverters series. In an automation line, it receives a fixed three-phase line supply and synthesizes a variable-frequency, variable-voltage output so that induction or permanent-magnet motors can accelerate, decelerate, and hold target speeds under PLC command. By regulating motor speed instead of throttling mechanical output, the drive improves energy use and reduces load stress in conveyors, pumps, and positioning axes that operate with changing process demands. This arrangement supports smooth speed adjustment across a wide operating range. Its compact format is intended for mounting inside standard electrical enclosures alongside contactors and control electronics.

This inverter is engineered for a supply voltage class of 400 V and draws power from a three-phase line connection. The output bridge uses an IGBT power stage that switches at 8 kHz, which helps reduce current ripple and audible motor noise. Torque is regulated through hardware-based current control, so response is handled by analog circuitry. An internal braking transistor routes excess regenerative energy to an external resistor, and the unit also includes an internal RFI input filter. An integrated cooling fan moves air across the heat sink to protect semiconductor junctions during continuous operation.

The drive has an IP20 enclosure rating, so it must be installed inside a control cabinet. It is qualified for climatic category 3K3, which covers typical indoor temperatures and moderate dust exposure. Operation remains reliable at relative humidity up to 95% without condensation and at site altitudes up to 2000 m before derating is required. These operating conditions suit indoor industrial applications where moisture is controlled and direct exposure is limited.