Product Description:

The KDF 1.2-050-300-W0-220 is a variable frequency drive built by Bosch Rexroth Indramat for the KDF Variable Frequency Drives series. The unit converts a fixed DC bus into a controllable three-phase output, allowing precise speed and torque regulation of an attached AC synchronous motor on automated machinery. By adjusting output frequency and voltage in real time, it coordinates motion sequences with the higher-level controller and improves energy efficiency in conveyor, packaging, and material-handling systems.

The internal power section is supplied by a DC link at 300 VDC, and it can deliver a continuous armature current of 50 A to the motor windings. Heat produced by the switching devices is removed through ambient air cooling, so the mounting location must permit unrestricted airflow. The enclosure has an IP20 rating, which allows installation inside a cabinet that shields it from conductive debris. A dual-line diagnostic display marked H1/H2 shows operating mode codes and trip conditions for local fault tracing. Overvoltage protection is integrated to clamp regenerative energy, and a top-mounted S1 switch provides a local reset after a fault clears. Power enters through input terminals L+ and L- that link directly to the common DC bus.

Protective earth ties to a front-side screw terminal positioned beside the control connectors, minimizing loop length to the cabinet ground bar. Motor phase conductors exit on output blocks coded A1, A2, A3, which simplifies schematic references in wiring documents. The drive can be operated at altitudes up to 1000 m above sea level; beyond that point, derating applies to limit electrical and thermal stress. Shipping and service handling are aided by a mass of 14.70 kg, which keeps the unit manageable in a standard 19-inch rack or back-panel layout.