Product Description:

The RD51.1-4B-001-L-FV-FW is a drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It interfaces with three-phase industrial mains and supplies adjustable voltage and frequency to asynchronous motors used in material handling, pumping, and factory automation. By using vector-independent speed regulation and coordinated braking control, the unit maintains stable torque over a broad operating range. It is suitable for systems that need controlled acceleration, steady running speed, and managed deceleration from the same drive platform. This helps reduce speed variation when the connected motor sees routine load changes.

This controller belongs to design generation 1. It uses a three-phase AC converter input that tolerates line fluctuations of ±10%. Speed is set through U/f curve control, which lowers voltage in proportion to frequency so motor flux remains stable at lower speeds. This arrangement supports stable motor operation in standard variable-speed applications. Internal heat is removed by forced air cooling, permitting continuous output at nominal current. A built-in brake chopper directs regenerated energy to external resistors during rapid stops, while an integrated mains filter helps reduce conducted emissions on the supply line.

Additional functions extend the drive beyond basic speed control. The unit can report output harmonics through current-filter feedback on U6, V6, and W6, which allows the control system to monitor filter behavior during operation. This signal is useful when external filtering is part of the installation. An auxiliary supply for 24 V standby power keeps the control electronics active during main power interruptions so communication can remain available. The permissible mains range of 380 to 480 V matches common 400 V systems and allows for normal supply variation.