Product Description:

The RD51.1-4B-037-L-V1-FW belongs to the RD 500 Drive Controllers series produced by Bosch Rexroth Indramat. As a drive controller, it regulates three-phase induction motors used in conveyor sections, pump modules, and other industrial axes that require adjustable speed and torque. By converting fixed-frequency plant power into a variable output, the unit provides closed-loop motor management for coordinated motion tasks on automated lines. This arrangement supports smooth acceleration, deceleration, and load matching across connected machinery.

This model delivers a nominal output of 37 kW, giving it enough capacity to handle medium-size process motors without oversizing the installation. It accepts mains voltages from 380 to 480 V and maintains operation within a supply fluctuation of ±10 %, so it tolerates common sag and swell conditions on factory power buses. Speed regulation uses U/f curve control, which keeps output voltage and frequency in a preset relationship for constant-torque or variable-torque loads. For rapid deceleration, a built-in brake chopper routes regenerated energy to an external resistor and helps prevent DC-link overvoltage.

On the line side, the controller uses a 3-phase AC converter configuration, meaning it rectifies and inverts three-phase AC without relying on a separate transformer. Internal heat is removed through forced-air cooling, which directs cabinet air across the heat sink to maintain semiconductor junction temperatures. An integrated mains filter limits conducted emissions, allowing installation in EMC-sensitive areas. When the main supply is off, a 24 V stand-by power input keeps the control electronics live for fieldbus monitoring or encoder reference retention. This allows diagnostic communication to remain available while the power section is inactive.