Product Description:

The KDA 2.1-100-3-API-U1 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. It regulates high-speed machine tool spindles by converting DC link power into controlled three-phase output for precise motion. The drive is series 2 and includes signal processing that works with CNC controllers to maintain stable speed control during demanding machining tasks. This arrangement supports accurate spindle response during cutting, drilling, and similar operations that require consistent rotational control.

This model draws its intermediate circuit from a DC bus rated at 300 VDC, and it can deliver a continuous motor phase current of 100 A. The heat sink blower that removes switching losses is powered by 115 V/50-60 Hz and directs air across a finned rear-mounted surface. Because the cooling mode is forced cooling, airflow remains available even when spindle speed is too low for self-ventilation to be effective. The permitted operating temperature range is 5 to 45 °C, and a thermal sensor reduces output if cabinet temperature rises too far. Speed references reach the control board as analog voltage signals, which allows the drive to respond directly to external command input from the control system.

Installation is permitted up to 1000 m above sea level without additional cooling measures in typical factory settings. The drive receives its reference through an analog speed command value, while an incremental encoder output supplies real-time motion data for closed-loop control. A second encoder input is available for spindle-mounted feedback or for monitoring an auxiliary motor in synchronized applications. These feedback channels help the controller limit speed error during acceleration, load changes, and rapid transitions between machining states.