Product Description:

The RD52.1-4N-090-W-V1-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. As a converter-based module, it links a three-phase mains source to an induction or synchronous motor and supplies regulated current and voltage for precise speed and torque control in automated machinery. In production lines, test stands, and handling systems, the unit functions as the closed-loop actuator that translates PLC commands into repeatable motion within distributed cabinet installations. This operating role allows the connected motor to respond smoothly during acceleration, deceleration, and steady-state load changes.

This model accepts a mains window of 380 to 480 V and is configured as a 3 x AC converter, so the input must be a balanced three-phase network. Inside that range, the control electronics maintain performance within a tolerance of ±10 %, which helps prevent nuisance trips when utility voltage drifts. The power stack is rated for 90 kW, delivering sustained output suited to large pumps, extruders, and hoists. Heat generated by the IGBTs is removed through liquid cooling, allowing compact cabinet placement without relying on high internal airflow. The unit is version 1, which identifies this build of the controller.

Vector processing is handled through field-oriented vector control, enabling dynamic torque regulation even at low speed. Because the housing is supplied without a built-in brake chopper, regenerative energy must be routed to an external resistor or returned to the grid through suitable system equipment. An integrated mains filter attenuates conducted emissions, so additional RFI components are usually unnecessary in many installations. For emergency conditions or parameter checks when the mains is down, the controller can be powered from an auxiliary line that provides 24 V standby power. This external feed keeps the control logic active even when the main power section is not energized.