Product Description:

The KDA 2.1-150-3-DP0-U1-115 is a Bosch Rexroth Indramat controller in the KDA Spindle Drives series. It energizes machine-tool spindles by converting a fixed DC link into regulated three-phase current that follows digital speed references from the CNC. The integrated heat sink blower and dual encoder paths help the motor maintain its commanded velocity during high-speed cutting and drilling cycles in automated lines. This arrangement supports closed-loop spindle control where speed stability must be maintained as the mechanical load changes during machining.

It delivers a continuous output of 150 A while operating from a 300 V DC bus supplied by the central converter section. The mounted heat sink blower is powered by a dedicated 115 V/50–60 Hz line, so airflow remains available independently of the DC link. Speed references arrive through a digital 16-bit parallel interface, and diagnostics can be viewed through an analog monitor with a range of 0 to +10 V. That monitor channel can sink up to 5 mA, and external signal outputs are limited to 50 mA. A second encoder input is available for additional spindle or motor feedback, and the primary motor encoder connects through a 15-pin X3 plug. No additional interface options are fitted, which keeps cabinet wiring straightforward.

Acceptable ambient conditions span 5 to 45 °C, and the drive can be mounted up to 1000 m above sea level without derating. The incremental encoder channel tolerates ±15 V signals, while the electronics provide +5 V to power the spindle feedback. Forced cooling keeps semiconductor temperatures within normal operating limits during sustained spindle duty. The feedback and monitor connections support stable speed regulation and continuous operating supervision during spindle service.