Product Description:

The KDA 3.1-100-3-DPS-U1 belongs to the KDA Spindle Drives series released by Bosch Rexroth Indramat. As a closed-loop drive module for high-speed machining spindles, it converts regulated DC bus power into controlled three-phase output so that motor speed follows numerical control commands. The unit is categorized as a spindle drive module for industrial automation and is used to maintain precise rotational accuracy during drilling, milling, or grinding operations. This type of control helps the spindle hold its commanded speed when cutting load changes during machining cycles.

Internal power is drawn from a common DC bus rated at 300 VDC, and the converter can deliver up to 100 A of continuous output current to the motor windings. A dedicated heatsink blower is supplied from an auxiliary line of 115 V/50–60 Hz, allowing the mounted fan to remove switching losses without burdening the bus supply. Command and feedback data enter the control logic as a digital 16-bit parallel speed word, so the numerical controller can reference exact rpm values without analog drift. The permissible ambient operating range is 5 to 45 °C, and the drive can be installed at altitudes up to 1000 m above sea level. The blower mounts directly to the aluminum heat sink, which helps the compact housing manage heat during continuous operation.

Forced cooling keeps the internal temperature uniform by pushing air through the fin channels at a fixed rate governed by the onboard blower. For supervisory communication, a serial interface (RS-232-C) is available, allowing parameter loading or diagnostic retrieval through standard terminal software. Motion accuracy improves because a second encoder input can process spindle feedback alongside the primary tachometer, supporting fine speed trimming and rigid tapping capability. The drive is in series 3.