RD51.1-4B-004-L-D1-FW Bosch Rexroth Indramat
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MPN: R911200531
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The Bosch Rexroth Indramat RD51.1-4B-004-L-D1-FW is a drive controller from the RD 500 Drive Controllers series. It features U/f curve control, a built-in brake chopper, and an integrated mains filter. This converter operates with a 3-phase AC supply in a voltage range from 380 to 480 V and utilizes forced air cooling.
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Product Description:
The RD51.1-4B-004-L-D1-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It governs three-phase induction motors by modulating output voltage and frequency so that conveyor lines, pumps, and fans maintain stable speed profiles in automated plants. The unit bridges the power section and the control architecture by accepting incoming AC power, converting it within the drive, and delivering regulated output that matches changing industrial loads. This makes it suitable for applications that need repeatable motor behavior during speed changes and load variations.
This controller is designed for mains supplies between 380 to 480 V, which covers common plant distribution networks. A 3 x AC converter supply means the device rectifies and inverts three-phase power internally, allowing variable-frequency operation without external converters. Line deviations of up to ±10 % are tolerated, so minor voltage swings do not interrupt operation. Motor excitation follows U/f curve control, which keeps the ratio between voltage and frequency constant to preserve torque on standard squirrel-cage machines. This control method is commonly used where stable speed regulation is needed for general-purpose motor loads. Thermal energy from the switching elements is removed by forced air cooling, and continuous airflow through the heat sink helps keep semiconductor temperatures within a safe operating range.
Regenerated energy is managed by a built-in brake chopper, which directs surplus DC-bus voltage into external resistors during rapid deceleration. Conducted electromagnetic interference is reduced by an integrated mains filter, which removes the need for a separate line filter in many cabinets. This arrangement supports compact panel layouts by reducing the number of separate power components around the drive. Field wiring is simplified by a NAMUR terminal strip with external 24 V standby power, which provides standardized sensor connections and auxiliary control power when the main bus is idle. Control circuits can remain energized for monitoring and signal handling even when motor power is not active. The drive is in design generation 1.
Frequently Asked Questions about RD51.1-4B-004-L-D1-FW:
Q: Does the RD51.1-4B-004-L-D1-FW include a brake chopper?
A: The RD51.1-4B-004-L-D1-FW features a built-in brake chopper for managing energy dissipation during braking cycles.
Q: What type of control method does the RD51.1-4B-004-L-D1-FW offer?
A: This controller uses U/f curve control, providing reliable speed regulation for asynchronous motors.
Q: What is the cooling method used in the RD51.1-4B-004-L-D1-FW drive controller?
A: The RD51.1-4B-004-L-D1-FW uses forced air cooling to maintain operating temperature.
Q: What supply voltage range does the RD51.1-4B-004-L-D1-FW accept?
A: The voltage range supported by this controller is 380 to 480 V AC.
Q: Is there a mains filter included with the RD51.1-4B-004-L-D1-FW?
A: This model comes with an integrated mains filter to help reduce electrical noise from the power supply.
