Product Description:

The KDA 3.1-150-3-LQD-U1 spindle drive is assembled by Bosch Rexroth Indramat for the KDA Spindle Drives series. It functions as a modular power stage that draws energy from a shared DC bus and energizes three-phase spindle motors used in CNC machining centers, turning stations, and grinding machines. By executing torque and velocity commands issued over fiber-optic links, the unit delivers precise rotational control that is essential for maintaining surface finish, dimensional accuracy, and short cycle times within automated production lines.

Electrical ratings dominate the hardware description of revision 3. The drive can deliver a continuous output of 150 A, enabling direct connection to large-frame induction or synchronous spindle motors without derating. Its power stage is supplied from a 300 VDC link that is normally produced by an Indramat supply module; regulation circuits monitor this bus to prevent over-current or under-voltage trips. Thermal stability is maintained by a mounted heatsink blower that is fed from a separate 115 V 50/60 Hz AC source. Airflow through the fins is arranged as forced cooling, so internal component temperatures stay within design limits even during prolonged heavy roughing passes. Together these parameters define the maximum power envelope available to the spindle while adhering to the protection objectives of Series 3 hardware.

Interface and environmental data complete the operating profile. Speed references arrive through a SERCOS interface, and separate axis-level corrections can be injected over a digital position command interface when tighter contour control is required. The drive performs to specification in ambient air between 5 to 45 °C, provided installation height does not exceed 1000 m above sea level; outside these limits additional derating is necessary. These limits ensure the blower can evacuate heat effectively and that the control electronics maintain signal integrity under nominal air density and temperature conditions.