Product Description:

The KDF1.1-150-300-W1-115 is a variable frequency spindle drive produced by Bosch Rexroth Indramat within the KDF Variable Frequency Drives series. Designed for machine tools and production centers, the unit converts fixed-frequency three-phase power into a controlled output for high-speed asynchronous spindles. By regulating motor speed and torque, it supports closed-loop velocity systems that require rapid acceleration, deceleration, and bidirectional control. This operating method suits machining processes in which spindle speed must change quickly between cutting, positioning, and tool-handling steps.

Command signals are accepted in differential analog and 16-bit parallel formats, allowing either continuous speed references or digital codes from a PLC. Inside the CDM computer module, a microprocessor-based digital velocity loop calculates speed error and issues gate commands for stable regulation. The drive is classified as a variable spindle drive, so its output frequency follows process demand rather than staying fixed. It can operate up to 8000 rpm, which supports high spindle speeds without relying on mechanical gear changes. Its four-quadrant capability allows the motor to drive and brake in both rotational directions, which helps with reversing and controlled deceleration.

For position-oriented tasks, positioning is supported, so a supervisory controller can index the spindle to a programmed angular location before tool changes or threading cycles. DC bus energy is shared through a KDV modular supply, which supports a common power structure when multiple inverters are installed in one cabinet. Line isolation is handled by a three-phase power transformer that adapts plant voltage and provides galvanic separation. The drive is intended to work with an AC asynchronous spindle motor with feedback, giving the control loop real-time speed information across the operating range. That arrangement helps the spindle maintain commanded speed under changing load during cutting passes.