Product Description:

The RD52.1-4N-090-W-NN-FW belongs to the RD 500 Drive Controllers series produced by Bosch Rexroth Indramat. It is a three-phase AC converter module used to regulate induction or synchronous motors in automated machinery and process lines. By modulating supply frequency and voltage, the unit provides closed-loop speed and torque control that helps coordinate multiple axes, stabilize motor response under changing loads, and protect mechanical components during acceleration and braking. It is suited to variable-speed duties that require consistent regulation during starts, stops, and load changes.

Its control scheme is based on field-oriented vector control, meaning stator current components are resolved into flux-producing and torque-producing vectors so motor response follows reference commands with minimal phase error. The unit is rated for a continuous output of 90 kW, allowing it to drive high-power pumps, extruders, or conveyor sections without derating inside its thermal envelope. A mains input window of 380 to 480 V accommodates common low-voltage industrial networks, and the topology is a 3 × AC converter so the rectifier, DC link, and inverter are integrated in the same housing. Heat generated by the IGBTs is removed through liquid cooling, which permits dense cabinet layouts and reduces ambient temperature rise. Liquid-based heat removal also helps keep excess heat away from neighboring components in compact installations.

The power section tolerates line fluctuations of ±10 %, keeping the DC-link voltage within limits for stable vector regulation. Because it is supplied without a built-in brake chopper, external resistor modules must be added if dynamic braking energy needs to be dissipated instead of being fed back. An integrated mains filter attenuates conducted emissions, so additional RFI components are not normally required. This Generation 1 design carries no optional function cards, matching the not-equipped designation in the type code. Its control software is selected separately to suit the intended application.