Product Description:

The KDF3.3-150-300-W1-220/S301 belongs to the KDF Variable Frequency Drives series produced by Bosch Rexroth Indramat. As a closed-loop controller, it converts rectified line power into a regulated three-phase output that allows precise speed and torque adjustment on AC motors used in conveyors, printing lines, and general motion axes within automated plants. By modulating the amplitude and frequency of its inverter output, the drive maintains commanded shaft velocities while recovering or dissipating regenerated energy during braking and overhauling loads.

The unit operates from a DC link stabilized at 300 VDC, and its power section is sized for a continuous current of 150 A, giving it enough margin for rapid acceleration profiles. A speed window of 0 to 8000 RPM lets a paired motor run at crawl, rated, or field-weakening speeds without losing control resolution. The drive supports four-quadrant operation, so it can supply or absorb energy in both rotational directions, enabling regenerative braking and reverse motoring without external contactors. Thermal management is handled by an integral blower, so the unit is blower cooled and can provide continuous full-load service when cabinet airflow is unobstructed. Velocity or torque commands enter through a differential analog or 16-bit parallel interface, allowing the drive to connect either to analog PLC outputs or to high-resolution digital motion controllers without additional converters.

The cooling fan is energized from a dedicated 220 VAC auxiliary line, and its quick-disconnect plug is coded as 219 118 for easy identification. Rotor position is monitored by an incremental encoder, allowing the control board to close high-bandwidth speed loops and detect stalled or slipping conditions at low frequency. This feedback arrangement helps the drive maintain stable low-speed control during starting, reversing, and changing load conditions.