Product Description:

The RD52.1-4B-090-D-V1-FW is a drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It is engineered to regulate three-phase AC motors in automated machinery, supplying closed-loop speed and torque control so that production lines, test stands, and material-handling cells can maintain precise motion profiles. By integrating the control and power electronics in one chassis, the unit reduces cabinet space and simplifies wiring in compact drive systems. Its integrated layout also supports installations that need motor control and power conversion in a single enclosure without adding separate modules for basic operation.

This controller delivers a rated output of 90 kW and accepts a mains window of 380 to 480 V from a three-phase AC supply. Allowable line fluctuation is limited to ±10 %, helping the power stage remain stable when plant voltage varies within normal industrial tolerances. Motor regulation relies on field-oriented vector control, which separates stator current into flux-producing and torque-producing components for responsive operation during load changes. This control method also supports smooth acceleration, steady speed regulation, and predictable torque response across varying machine duties.

For braking energy management, the unit contains a built-in brake chopper that diverts regenerated power into an external resistor instead of feeding it back into the DC link. Thermal losses from the IGBTs are removed through a plug-through cooler (≤ 110 kW); this heat sink extends through the panel wall so that most dissipation occurs outside the enclosure. Conducted emissions are reduced by an integrated mains filter, which helps limit electrical noise on the incoming line and supports cleaner operation alongside nearby equipment. Control electronics stay active through 24 V standby power, allowing communication and monitoring functions to remain available when the main power section is off.