Product Description:

The KDA 2.1-050-3-DQI-U1 is a spindle drive module from Bosch Rexroth Indramat in the KDA Spindle Drives series. The unit is hardware version 2 and is intended for high-speed spindle axes in machining centers and similar automated equipment. It serves as the link between a fixed DC supply and the connected spindle motor. The drive converts the DC bus into controlled three-phase output so the motor can be regulated for torque and speed across a wide operating range. Pulse-width modulation and internal thermal management help support acceleration, deceleration, and stable spindle operation during repeated production cycles.

The power section operates from a regulated DC bus of 300 VDC and can deliver a continuous phase current of 50 A to the spindle motor. Heat is removed by a mounted heat sink blower attached directly to the housing, and the fan uses a separate supply of 115 V/50-60 Hz. This provides forced cooling, moving air through the fins so the power semiconductors can shed heat during long cutting passes and frequent speed changes. The arrangement removes heat at the drive without requiring a liquid chiller at the unit itself and supports stable thermal behavior inside the cabinet.

Speed commands are supplied through a 16-bit parallel digital interface, which gives the control system fine resolution when adjusting spindle velocity. The front panel also provides an incremental encoder output for synchronized feedback to connected CNC or PLC hardware. Normal operation is permitted in ambient temperatures from 5 to 45 °C. Full performance is maintained at installation heights up to 1000 m above sea level. The parallel command format supports direct speed control, while the feedback output can be used for monitoring rotational behavior and coordinating spindle activity with other machine functions.