Product Description:

The RD51.1-5B-018-D-D1-FW is a drive controller in the RD 500 Drive Controllers series manufactured by Bosch Rexroth Indramat. It connects a plant power source to an induction motor and regulates the output so motor speed and torque can follow process demands in material handling systems, test stands, and general factory equipment. Because the output frequency is adjustable, the drive can match motor behavior to changing loads instead of forcing full-speed operation at all times. Status and operating information are handled through the front terminal area, allowing the controller to exchange basic signals with the rest of the automation system.

The controller provides a continuous output of 18.5 kW and operates from a three-phase AC supply, which gives the power stage balanced input energy for typical industrial motor loads. It is intended for the 500 V class and uses U/f curve control, so motor voltage rises with frequency to maintain stable magnetic conditions across the speed range. Heat is removed by a plug-through cooler for drives up to 110 kW, which places the main heat sink through the cabinet wall and keeps much of the thermal load out of the enclosure. This cooling method helps the surrounding cabinet space stay less affected by the heat generated in the power electronics.

A built-in brake chopper handles regenerated energy during deceleration, helping prevent excessive DC-bus voltage when a driven load slows quickly. External connections terminate on a NAMUR terminal strip, and the control electronics can remain active from an external 24 V stand-by power source when the main supply is switched off. The unit is part of Design generation 1, which identifies its place within the RD product line. Keeping the control section energized in this way allows diagnostics and stored settings to remain available while the main power section is isolated.