RD51.1-5B-037-D-DL-FW Bosch Rexroth Indramat
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MPN: R911200666
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The Bosch Rexroth Indramat RD51.1-5B-037-D-DL-FW is a drive controller from the RD 500 Drive Controllers series. It features a built-in brake chopper and supports U/f curve control. The controller offers a rated power of 37 kW and operates with a 3-phase AC supply at 500 V using a plug-through cooler.
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Product Description:
The RD51.1-5B-037-D-DL-FW drive controller is produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It sits between a three-phase supply and an AC motor, modulating voltage and frequency so automated lines can match motor speed to changing load conditions. By converting fixed mains power into adjustable output, it supports controlled acceleration, deceleration, and steady operation in pumps, fans, and material-handling equipment. This operating approach also helps reduce unnecessary energy use during partial-load operation.
The controller has a built-in brake chopper that absorbs regenerated energy during rapid deceleration, protecting the DC link without requiring external hardware. Motor speed is managed by U/f curve control, which keeps the voltage-to-frequency ratio constant so torque remains available across the operating range. Thermal management relies on a plug-through cooler for units up to 110 kW, so the power modules pass through the cabinet wall and release heat directly to the surrounding air. The controller delivers a nominal output of 37 kW, which suits mid-sized production equipment that needs continuous power in this range. Its mains connection uses a converter with 3 x AC input, allowing the unit to rectify and smooth three-phase incoming power before inverter operation.
The permitted input spans 500 V, giving compatibility with facilities that distribute higher plant voltages while still allowing dynamic motor control. The unit is part of generation 1, so its mechanical dimensions and available software options match the earliest RD 500 release. Standard I/O is provided on a NAMUR terminal strip with external 24 V standby power, which allows control circuits to remain active when the main bus is de-energized. Control quality is improved by feedback of cable damping (C3, D3), which compensates for long motor leads and helps maintain stable current regulation. This can be useful where cable length would otherwise affect signal behavior between the controller and motor.
