Product Description:

The KDA 3.2-050-3-LQS-W1 is manufactured by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. It uses the 3.2 design code and is intended for machining centers that require controlled three-phase power for high-speed motorized spindles. By converting a fixed DC bus into variable voltage and frequency, the unit supports smooth acceleration, stable speed control, and controlled braking during cutting operations. This arrangement allows the spindle to respond accurately to changing process demands during automated production cycles.

The drive is rated for a continuous output of 50 A, which is the maximum motor phase current it can supply continuously under normal cooling conditions. Its internal power stage is fed from a 300 VDC link that originates in a shared supply module, so the drive operates from a centralized DC source rather than from its own mains rectifier. Thermal energy is removed by a mounted heat sink blower, and that fan receives a separate single-phase supply of 220 V, 50/60 Hz, so cooling remains available even when the main DC bus is inactive. Speed references reach the controller over a SERCOS interface, and a serial interface (RS-232-C) is also available for setup and parameter backup.

Operation is allowed between 5 to 45 °C, and forced airflow from the heat sink blower helps move heat away from the IGBT stack during sustained spindle loading. The unit uses forced cooling, so adequate airflow must be maintained when it is installed inside sealed electrical cabinets or other confined enclosures. This is especially important when cabinet ventilation is restricted by filters or closely spaced modules. Installation altitude is limited to 1000 m above sea level. Above that altitude, thinner air reduces convective heat transfer and may require current derating. The control section uses version 2 electronics, which matches the 3.2 product revision noted in the model designation.