Product Description:

The KDF2.1-50-300-W1/220 is a variable frequency drive produced by Bosch Rexroth Indramat for the KDF Variable Frequency Drives series. It converts a fixed industrial mains supply into a controlled DC link and then a variable AC output, allowing precise speed and torque regulation of three-phase induction motors used in conveyors, presses, and other automated stations. As a power module, it interfaces with supervisory motion controllers and supplies the required current to the attached motor group.

Thermal management relies on a dedicated blower that operates across 50–60 Hz, eliminating the need for frequency-specific fan kits when the drive is installed in regions with either power standard. The blower is energized from an external AC source rather than the internal DC link, so fan service can continue during DC-bus discharge cycles. Rated input to the fan is AC 220 V, a common facility voltage that simplifies wiring inside the cabinet. Overall heat is removed through forced ventilation, maintaining semiconductor junction temperatures within acceptable limits even at the device’s continuous phase output of 50 A. This current capacity allows the drive to energize medium-power motors without thermal derating during prolonged duty cycles.

Control wiring is grouped on the bus connector labeled X1, and its 16-pole layout provides dedicated pins for DC-bus sharing, enable lines, and diagnostic signaling to upstream controller cards. The power section is referenced to a DC 300 V link that is distributed among coordinated drives, which helps maintain uniform energy storage and predictable braking resistor behavior. Because the link circuit can be paralleled through the bus system, multiple KDF units may exchange regenerative energy instead of wasting it as heat. The remaining cooling and fan terminals are separated from the logic harness, reducing electromagnetic interference when the blower motor starts.