Product Description:

The Bosch Rexroth Indramat KDA3.3-150-3-DP0-W1 belongs to the KDA Spindle Drives series. It regulates high-speed machine-tool spindles by converting commanded velocity data into controlled three-phase motor currents. Within a multi-axis automation rack, it forms the power stage between the CNC control loop and the mechanical spindle, helping the axis maintain stable speed during cutting, drilling, or grinding operations. Additional monitoring circuits track bus voltage, current, and thermal status so the drive can report faults before spindle operation is allowed to continue.

The power stage is rated for a motor phase current of 150 A, while its thermal design permits a continuous process current of 90 A without derating. Both values are supplied from a shared DC link held at 300 VDC. Internal IGBTs dissipate switching heat through forced cooling, and a cabinet blower supplied with 220 VAC provides the required airflow. Control electronics draw 160 mA from an isolated 15 V measuring supply and 1.6 A from a 24 V load circuit to support converters and relay coils. The encoder interface provides a regulated +5 V output, accepts feedback signals up to ±15 V, and uses a single feedback channel rather than a second encoder input.

The unit operates in ambient temperatures from 5–45 °C and can be installed up to 1000 m above sea level without performance reduction. Its aluminum chassis weighs 17.4 kg, so the mounting structure must support that static load in the cabinet. A protection rating of IP10 indicates open-frame construction that depends on enclosure airflow instead of a sealed housing. The command path accepts velocity data through a 16-bit parallel interface, and the same control wiring also carries status lines plus a 24 V blower interlock so the control system can verify fan operation before spindle torque is enabled.