Product Description:

The RD52.1-8N-160-F-V1-FW is produced by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. It is a cabinet-mount inverter stage that converts a common DC bus into three-phase output for induction or synchronous motors used in material-handling lines, packaging machines, and similar automation cells. By using vector-based current regulation, the unit maintains precise torque even at low speeds. This arrangement lets one upstream supply feed multiple drive sections while each axis still receives controlled motor current. It is suited to applications that need coordinated acceleration, stable low-speed torque, and repeatable response under changing load conditions.

The controller is supplied without a built-in brake chopper, so an external resistor module is required when regenerative energy is expected. Its current loop uses field-oriented vector control, which aligns stator current with rotor flux to keep torque response linear across the speed range. Thermal management uses forced-air cooling with integrated liquid circulation; fans move cabinet air across an internal heat exchanger connected to a coolant loop, which helps stabilize semiconductor temperature during high-load cycles. The cooling path removes heat from the power section without placing the full thermal load into the cabinet air. The power stage is rated for 160 kW continuous output and can operate from a DC link up to 700 V. That output level suits large conveyors and other process drives that draw sustained motor power from a shared intermediate circuit.

The unit uses an inverter DC link, meaning it expects a stabilized intermediate circuit rather than direct mains input. This arrangement places rectification and bus management in an upstream supply section instead of inside the inverter stage. Control electronics can remain active through an auxiliary supply that provides 24 V standby power, allowing communication and diagnostics to remain available when the main link is de-energized. This is useful during staged startup or shutdown when the power section is not active. The unit belongs to design generation 1, so its mechanical dimensions and option boards match other first-generation RD 500 devices.