Product Description:

The KDA 3.1-050-3-D00-U1 belongs to the KDA Spindle Drives series manufactured by Bosch Rexroth Indramat. As a spindle drive, it converts regulated DC bus energy from the machine power supply into three-phase output for high-speed machining spindles, allowing coordinated speed control in CNC systems. The unit fits directly into modular drive racks used on lathes, milling centers, and grinding machines, where precise spindle acceleration and deceleration are critical. This arrangement allows the spindle motor to maintain commanded speed during cutting, drilling, and grinding operations that place changing loads on the shaft.

This model draws its DC link from a 300 VDC supply and can deliver a continuous output of 50 A to the connected motor. That current capacity supports sustained spindle operation in applications that require steady torque over long machining cycles. A mounted heat sink blower removes switching losses, and the blower is powered by a separate 115 V/50–60 Hz source so thermal management remains independent of the main DC bus. Speed commands are handled through a 16-bit parallel digital interface that transfers absolute numerical values from the CNC controller, which helps prevent analog drift. The drive omits a second encoder input, so feedback integration relies on the primary spindle encoder routed through the standard connector set.

The drive can operate between 5 to 45 °C and at elevations up to 1000 m above sea level without derating. It uses forced cooling to maintain internal component temperatures during operation, which is important when the module is installed in enclosed machine cabinets. The unit is built to design level 3 within the KDA platform, indicating the third design generation for this module. The stated temperature and altitude limits apply to normal industrial operating conditions.