Product Description:

The RD51.1-5N-200-R-FV-FW is a drive controller produced by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. It converts fixed-frequency mains power into a regulated output for three-phase induction motors used in material handling systems, presses, and process equipment. By varying output voltage and frequency, the unit supports adjustable motor speed while keeping the control method straightforward for industrial duties that do not require closed-loop servo behavior. This makes it suitable for applications where reliable motor control, stable operation, and integration with established automation equipment are more important than highly dynamic positioning.

This controller delivers a continuous output of 200 kW and operates from a 500 V supply section. Its modulation uses U/f curve control, which helps maintain motor flux as frequency changes and supports predictable torque behavior at reduced speeds. Heat is removed by liquid cooling with an internal pump, allowing the power stage to handle high loading without relying on cabinet air alone. The unit uses a 3 x AC converter input for connection to a three-phase utility source, so incoming AC power is rectified internally before it is applied to the drive electronics.

The housing is built without a built-in brake chopper, so braking energy requires an external resistor when the application returns power during deceleration. A 24 V standby power circuit keeps key functions available when the main power stage is off, and current filter feedback is available at terminals U6, V6, and W6 for monitoring output current behavior. The design belongs to generation 1, which matches early RD-series peripheral modules and supports compatibility with that platform. This arrangement allows the drive to remain active for monitoring functions while the main power section is de-energized.