Product Description:

The RD51.1-4N-037-L-D1-FW is a drive controller from Bosch Rexroth Indramat’s RD 500 Drive Controllers series. It serves as the power conversion stage between a three-phase mains supply and an induction motor, supplying adjustable frequency and voltage so automated lines can modulate speed, ramp profiles, and load torque under PLC command. By integrating gating electronics, power semiconductors, and feedback monitoring in one module, the unit streamlines cabinet layout for conveyor, pumping, and material-processing equipment. This arrangement also helps the drive maintain smooth motor control in applications that require controlled acceleration and stable operation under changing loads.

This controller provides a continuous mechanical output of 37 kW. It accepts line voltages in the 380 to 480 V range and is engineered for a three-phase AC converter input topology, allowing direct connection to standard industrial feeders without an isolation transformer. The DC link and control circuits tolerate supply variations of ±10%, which helps reduce nuisance trips during brief undervoltage or overvoltage events. An integrated mains filter is fitted ahead of the rectifier to suppress conducted radio-frequency noise and reduce the amount of external filtering required in the cabinet.

Speed control follows the U/f curve control method, giving constant flux across the operating range without requiring encoder feedback. Internal heat is removed by forced-air cooling, so clear inlet and outlet paths are necessary to keep the heat sink within its allowable temperature range. The hardware is supplied without a built-in brake chopper, so applications that need rapid deceleration must use an external braking unit. Field wiring terminates on a NAMUR terminal strip, and a 24 V stand-by line keeps the logic supply active during mains isolation for parameter retention. The assembly corresponds to design generation 1.