Product Description:

The RAC3.1-150-460-A01-Z1-220 is an AC main spindle drive controller built by Bosch Rexroth Indramat and assigned to the RAC Spindle Drive Controllers series. The unit governs torque and speed on high-performance machine tool spindles, translating drive commands into regulated three-phase output for precision metal cutting and other automated processes. It is intended for compact cabinet installations where dedicated axis modules share a common DC bus and where stable spindle response is required during speed changes.

Rated for 150 A, the controller supports a continuous output of 35 kW for the spindle motor section. It accepts mains feeds up to 3 x AC 460 V and down to 3 x AC 380 V, allowing the same hardware to run on typical North American or European plant power. Within this voltage window, the power stage can deliver a peak controller output of 40 kW for five seconds, and the regeneration channel can momentarily return the same amount of power to the supply. The housing carries the open-frame protection level IP10, so the drive must be mounted inside a closed electrical cabinet that provides its own airflow path and finger-safe barriers. Because of the open-frame enclosure, the surrounding cabinet must also provide physical protection around live sections.

For steady operation, the power electronics limit phase current to 92 A, and excess kinetic energy is continuously dissipated at 27 kW in the braking resistor chain. The low-power services, such as gate drives and diagnostics, draw from a separate 220 V AC control circuit, which helps keep control functions stable during line-side disturbances. Installation planning must account for a mass of 49 kg, which affects cabinet support requirements and handling. The unit is in humidity class F under DIN 40040, allowing up to 75% relative humidity without condensation, and placement is limited to a maximum altitude of 1000 m so air density remains sufficient for heatsink cooling and dielectric spacing.