Product Description:

The RD52.1-4B-315-F-NN-FW is a high-capacity drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. As a converter-based unit, it supplies regulated AC power to large induction or synchronous motors used in conveyors, presses, and other heavy automation equipment. By monitoring motor feedback and modulating its power electronics in real time, the controller provides precise speed and torque control that matches plant commands to the mechanical load. This makes it suitable for demanding industrial processes where stable motor response and controlled acceleration are important during continuous operation.

Electrical performance centers on a rated output of 315 kW, giving the controller substantial capacity for high-power drive systems. The mains section accepts a three-phase input in a voltage range of 380 to 480 V, and supply variations within ±10 % are permitted without derating. Internally, motion commands are handled with field-oriented vector control, which regulates motor flux and torque independently for accurate speed behavior across changing loads. The power bridge uses a 3 x AC converter configuration, allowing controlled energy transfer between the DC link and the motor. This arrangement supports smooth operation in applications that require consistent torque, responsive speed correction, and stable motor control over a broad operating range.

A built-in brake chopper connects directly to the DC link so excess regenerative energy can be dissipated during rapid deceleration. Thermal stability is maintained by forced-air cooling with integrated liquid circulation, which combines airflow across the heat sinks with liquid removal of concentrated losses. Line-side harmonics are reduced by an integrated mains filter, so an external filter cabinet is not required for this function. The hardware corresponds to design generation 1. No application-specific function package is included with the base unit, which keeps the controller focused on core power conversion and closed-loop motor control.