Product Description:

The RD52.1-4N-075-W-V1-FW drive controller belongs to the RD 500 Drive Controllers series produced by Bosch Rexroth Indramat. It is a panel-mounted inverter that converts three-phase mains power into a regulated output for asynchronous or synchronous motors used in material handling, plastics processing, and test equipment. Acting as the central regulator, it oversees torque, speed, and direction commands issued by a PLC and integrates the motor section with the broader automation architecture over standard fieldbus links. This arrangement allows one controller to manage motor behavior while still exchanging operating data and status information with the rest of the machine.

Inside the controller, control algorithms run as field-oriented vector control, so stator currents are resolved into direct and quadrature components for accurate flux management. The power section supports 75 kW of continuous mechanical output and draws energy from a line that may range from 380 to 480 V. Because the front end is a three-phase AC converter, the rectifier and DC link are already included, removing the need for external power modules. Excess heat is carried away through liquid cooling, which allows the device to retain full rating in tightly packed cabinets by coupling its heat exchanger to a plant chilled-water circuit.

The power electronics are shielded from conducted emissions by an integrated mains filter, which reduces the need for separate line components. Incoming voltage swings of ±10 % are accepted without derating, improving availability when supply quality fluctuates. Low-power electronics remain energized via 24 V stand-by power, so bus communication and diagnostics stay online even when the main stage is isolated. This helps preserve fault reporting and network visibility during controlled shutdowns or while the power stage is disabled for service. The unit comes without a built-in brake chopper, so applications that need rapid deceleration must connect an external resistor to the DC link.