Product Description:

The KDA 2.1-150-3-DYD-U1 is a spindle drive produced by Bosch Rexroth Indramat and belongs to the KDA Spindle Drives series. Within an automation cell, it regulates three-phase motor torque and speed so a machine-tool spindle can accelerate, hold a programmed velocity during a cut, and decelerate under closed-loop control. This type of regulation helps the spindle respond predictably when load conditions change during machining. The drive is powered from a common DC bus and removes heat through an integral blower, allowing it to be mounted close to other power electronics while maintaining stable operation in drilling, milling, and grinding applications.

The heat sink blower operates from 115 V 50–60 Hz, and this separate AC supply keeps cooling independent of DC bus status. Air is moved across the heat sink by a mounted blower, and the drive uses forced cooling so semiconductor junction temperatures stay within limits at the rated current of 150 A. Power to the internal converters is supplied by a 300 VDC bus, and all control functions remain stable as long as ambient temperature stays within 5–45 °C. These operating conditions support continuous spindle duty, repeated acceleration, and rapid speed changes without interrupting thermal management.

A second feedback connector accepts a second encoder input, enabling synchronous spindle arrangements that require phase alignment or coordinated speed matching between axes. Digital motion profiles can be transferred through the additional command interface, while velocity setpoints are received as a 16-bit parallel speed command for direct integration with compatible machine controls. Safe operation is permitted up to 1000 m installation altitude before current derating is required. When the machine remains within the stated elevation and temperature limits, the cooling path can remove excess heat continuously during extended cutting cycles.