Product Description:

The KDF1.2-100-300-W1-220 is a variable frequency drive produced by Bosch Rexroth Indramat within the KDF Variable Frequency Drives series. It is intended to regulate the speed of an induction motor in automated machinery, allowing process lines, conveyors, or spindle systems to match motor speed to changing load demand without external feedback devices. By converting fixed-frequency AC power into a DC bus and a synthesized output waveform, the unit provides a compact electronic alternative to mechanical gear changes and can improve energy use in industrial automation systems.

The power section is sized for 100 A of continuous output current, so the drive can energize motors that draw substantial starting and running current. A stabilized internal bus of 300 VDC supplies the link voltage that the inverter stage modulates into three-phase output. With a speed range of 0 to 8000 rpm, the controller supports both low-speed torque tasks and high-speed machining duties. The specified motor capacity of 25 HP indicates the maximum shaft power that can be delivered at rated voltage and frequency. Heat is removed through a blower-cooled assembly, permitting full-load operation in panels where natural convection is insufficient. Open-loop drive control allows the unit to regulate speed without tachometer or encoder feedback, and the induction motor format avoids the maintenance associated with permanent-magnet designs.

A command interface width of 16 bits gives the microprocessor precise numerical resolution when interpreting speed references. Speed requests enter as an analog signal, making the unit compatible with standard 0–10 V or ±10 V control sources. Inside the regulator, digital microprocessor-based control computes pulse-width patterns that maintain the requested speed across load changes. The separate fan and control circuit operates from 220 VAC, isolating auxiliary power from the main DC link and supporting consistent cooling airflow and logic supply during changing line conditions.