RD51.1-5B-018-L-D1-FW Bosch Rexroth Indramat
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MPN: R911200766
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The Bosch Rexroth Indramat RD51.1-5B-018-L-D1-FW is a drive controller from the RD 500 Drive Controllers series with a rated power of 18.5 kW and a voltage range of 500 V. It features U/f curve control, a built-in brake chopper, and uses forced air cooling. The unit operates as a Converter 3 x AC and includes a NAMUR terminal strip and external 24 V stand-by power.
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Product Description:
The RD51.1-5B-018-L-D1-FW is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. As a converter-based unit, it regulates three-phase induction motors in automated lines by adjusting stator frequency and voltage so that conveyors, pumps, or machine tools can run at commanded speeds with steady torque. By varying output frequency instead of applying fixed line frequency directly to the motor, the controller supports more flexible speed regulation in process equipment. This operating method also helps produce controlled acceleration and smoother speed changes during routine machine operation.
This controller draws power through a three-phase mains input and is specified for line voltage up to 500 V. Inside the housing, a built-in brake chopper dissipates regenerated energy during rapid deceleration to keep the DC-bus voltage within safe limits. Motor flux is governed with U/f curve control, a method that matches output voltage to frequency for stable magnetizing current across the full speed range. The power stage is rated for 18.5 kW, giving the unit enough headroom for medium-sized industrial motors without derating. The unit uses a Converter 3 × AC supply structure that rectifies and filters the incoming line. Because the mains are converted before the output is synthesized, the drive can deliver adjustable motor frequency rather than passing supply frequency straight to the load.
Thermal management relies on forced air cooling; fans move air across the heat sink to prevent semiconductor overheating under continuous full load. The controller’s I/O level features a NAMUR terminal strip that simplifies field wiring for limit switches or proximity sensors, and a standby circuit that accepts an external 24 V standby power feed so parameter memory and diagnostics stay active when the main supply is isolated. Keeping the standby circuit energized allows status information to remain available even when motor power is removed. The controller is part of generation 1 in the RD 500 platform.
Frequently Asked Questions about RD51.1-5B-018-L-D1-FW:
Q: Does the RD51.1-5B-018-L-D1-FW include a brake chopper?
A: The RD51.1-5B-018-L-D1-FW features a built-in brake chopper for braking energy management.
Q: What control type is used in the RD51.1-5B-018-L-D1-FW drive controller?
A: This drive controller operates with U/f curve control for motor speed regulation.
Q: How is the RD51.1-5B-018-L-D1-FW cooled during operation?
A: The RD51.1-5B-018-L-D1-FW is equipped with forced air cooling to maintain optimal operating temperatures.
Q: What is the rated power of the RD51.1-5B-018-L-D1-FW drive controller?
A: This drive controller provides a rated power output of 18.5 kW.
Q: What type of power supply does the RD51.1-5B-018-L-D1-FW require?
A: It accepts a supply type of three-phase AC with a voltage range of 500 V.
