Product Description:

The 18.F6.K13-3421 inverter belongs to the F6 Combivert Inverter Drives series from KEB. Designed as a panel-mounted, air-cooled AC drive, it converts a fixed three-phase mains supply into variable-frequency and variable-voltage output so PLCs or motion controllers can regulate the speed, torque, and rotational direction of induction or synchronous motors. By replacing mechanical throttling, the device provides precise control and can reduce energy consumption in conveyors, mixers, and material-handling equipment used in industrial automation.

The drive accepts a three-phase supply within an operating range of 280 to 550 V, with 400 V AC as its nominal voltage. At the nominal voltage, it draws a maximum current of 59 A and provides an apparent output power of 35 kVA. The inverter delivers a continuous output current of 50 A, which is sufficient to operate motors rated up to 22 kW while remaining within its thermal limits. The power devices use a base carrier frequency of 2 kHz, balancing switching losses with motor noise. For short events such as acceleration or impact loading, the current limit rises to 180% before a protective shutdown occurs.

The control section supports VARAN and CAN fieldbuses, allowing direct network integration without additional cards. Its two-channel multi-encoder port enables simultaneous feedback from incremental and absolute sensors for speed and position control loops. An integrated braking transistor directs regenerated energy to an external resistor, preventing rapid deceleration from raising the DC-link voltage beyond safe limits. The output frequency can be adjusted from 0 to 599 Hz, and the gate drivers permit a peak carrier frequency of 16 kHz when lower motor noise is required. During process peaks, the unit tolerates a load of 150% for 60 seconds. The built-in Safe Torque Off (STO) function isolates the power devices on demand to support machinery safety requirements.