Product Description:

The KDA 3.1-150-3-L0I-W1 spindle drive is produced by Bosch Rexroth Indramat within the KDA Spindle Drives series. It regulates the DC link energy supplied by a companion power supply and generates three-phase output for machine-tool spindles, so it provides speed and torque control in automated machining and drilling equipment. Velocity commands are accepted through the SERCOS interface, enabling fiber-optic digital communication with multi-axis CNC controllers. This allows the spindle axis to respond to commanded speed changes during cutting and positioning cycles.

An internal blower mounted on the heatsink is powered from an auxiliary line rated at 220 V / 50/60 Hz. This separate source keeps the cooling fan active even when the main DC bus is disabled. The power section accepts a bus voltage of 300 VDC, which matches the output of Indramat supply modules and suits the drive’s insulation and switching layout. Continuous output capability reaches 150 A, allowing the connected spindle motor to deliver high acceleration without current foldback. The cooling hardware uses a mounted heatsink blower, and heat removal is supported in ambient temperatures from 5 to 45 °C. The unit also provides an incremental encoder output for downstream speed monitors or PLC counters, while applications that require dual-channel feedback must add that function externally.

Cooling is done by forced cooling, and the drive supports installation heights up to 1000 m above sea level before derating is required. The separate fan supply helps remove stored heat after the main power section is turned off, which supports stable thermal behavior during normal machine stops. Because the unit does not include a second encoder socket, redundant position feedback is not available inside the drive. Single-channel speed monitoring remains available through the encoder output without adding another internal feedback path.