Product Description:

The RD52.1-4B-090-L-NN-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. In an automation cell, it converts fixed-frequency plant power into a variable three-phase output so AC motors can follow commanded speed and torque references with high accuracy. By linking a PLC to the mechanical load, the unit supports repeatable cycle timing and helps protect connected machinery through internal monitoring functions. This makes it suitable for conveyors, process equipment, and other industrial systems that need adjustable motor speed under changing load conditions.

On the input side, the controller accepts 380 to 480 V three-phase power and is configured as a Converter 3 x AC, so it can be connected directly to common factory distribution panels. The permissible line variation is ±10 %, allowing stable operation when supply voltage changes within that range. The unit is rated at 90 kW of output power. Control is handled through field-oriented vector control, which allows separate regulation of torque and magnetic flux. An integrated mains filter reduces conducted emissions and supports EMC compliance.

Thermal and transient loads are managed by a built-in brake chopper, which diverts regenerated energy to an external resistor during rapid deceleration. This arrangement is useful in applications with frequent stopping or speed changes, where regenerated energy would otherwise raise DC bus voltage. Heat produced during these events is removed by forced air cooling, a fan-based method that helps keep internal component temperature within normal operating limits. The unit is design generation 1, placing it in the first RD52 design version. It is supplied without optional functions, leaving expansion positions available for application-specific options.