Product Description:

Bosch Rexroth Indramat manufactures the KDA 3.2-150-3-A0I-W1 for its KDA Spindle Drives series. The drive operates as a closed-loop power module that converts CNC control signals into regulated three-phase output for motorized spindles used in milling, drilling, and grinding centers. It is intended for cabinet installation beside other drive packages rather than as a stand-alone unit. In machine tools, this role supports steady spindle acceleration, consistent speed regulation, and controlled torque delivery during repeated machining cycles. This makes it suitable for systems where spindle response must remain predictable as cutting conditions change.

The power stage is supplied from a DC bus rated at 300 VDC, and it can deliver up to 150 A of continuous armature current to the connected spindle motor. Thermal loading is managed by a mounted heat sink blower, while airflow is directed through fin channels under forced cooling to limit semiconductor temperature rise during rapid acceleration. The blower uses a separate supply of 220 V AC at 50–60 Hz, so cooling can continue even when the main power section is disabled. This arrangement supports spindle duty with frequent speed changes, tool engagement, and extended operating periods.

The permitted ambient temperature range is 5 to 45 °C, so cabinet ventilation must keep the surrounding air within that range during continuous production. Installation altitude is limited to 1000 m above sea level, because thinner air reduces the effectiveness of forced airflow around the heat sink. For control and monitoring, the unit provides an incremental encoder output for forwarding spindle data to auxiliary controllers, and the velocity loop accepts an analog speed command from the CNC. No secondary encoder input is included, which keeps wiring focused on the main motor feedback path and leaves the primary transducer as the central source of spindle information.