Product Description:

The KDF 1.2-100-500-W1-220 is produced by Bosch Rexroth Indramat within the KDF Variable Frequency Drives series. This model is an AC spindle drive designed for integration into CNC machines and automated production lines where rapid speed changes and precise spindle positioning are required during repeated operating cycles. It converts fixed mains power into a variable-frequency, variable-voltage output that matches motor demands, allowing closed-loop control of spindle acceleration, deceleration, and dwell functions during metal-cutting or similar industrial tasks.

The drive is enclosed in a NEMA 12 cabinet, so the enclosure resists dust, coolant splash, and non-corrosive oil mist when the unit is placed inside a properly sealed panel. Physical installation follows a panel-mount layout, keeping the heat-generating electronics on a flat mounting surface that can be coupled to external ducting or forced air. Speed regulation is handled by a digital velocity loop, which samples feedback and updates torque commands at fixed intervals for consistent response under changing loads. Incoming numerical setpoints are transferred over a 16-bit digital word, giving fine resolution for commanded speed and orientation values. To close the loop, the connected motor supplies shaft position through an incremental encoder, allowing the controller to verify actual velocity during every control cycle.

The analog interface accepts a differential voltage signal, reducing common-mode noise so long cable runs inside machine frames do not corrupt reference commands. Maximum programmable speed reaches 8000 rpm, enabling high-surface-footage cutting on small workpieces or fine finishing passes at the spindle. When orientation is critical, such as during tool-change alignment, the unit can lock the spindle in two discrete positions that are 180° apart, ensuring repeatable mechanical indexing without additional external hardware.