RD52.1-4B-055-L-NN-NN-NN-FW Bosch Rexroth Indramat
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MPN: R911289502
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The Bosch Rexroth Indramat RD52.1-4B-055-L-NN-NN-NN-FW is a drive controller from the RD 500 Drive Controllers series. It features a rated power of 55 kW and operates with a voltage range of 380 to 480 V. This first generation model includes a built-in brake chopper, integrated mains filter, and employs forced air cooling.
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Product Description:
The RD52.1-4B-055-L-NN-NN-NN-FW is a drive controller in the RD 500 Drive Controllers series produced by Bosch Rexroth Indramat. In automated systems, it converts fixed-frequency line power into a variable output that allows a higher-level PLC to regulate motor speed and torque. By linking the three-phase supply to the motor windings, it delivers controlled electrical power so conveyors, pumps, and process axes can follow programmed operating profiles. Because the output is adjusted to match changing demand, the drive supports smooth acceleration, stable running speed, and controlled deceleration during normal machine operation.
The unit can deliver up to 55 kW of mechanical power, which suits medium-size motors used in material handling and packaging lines. Its input range of 380 to 480 V keeps the DC bus within its intended operating window across common industrial power systems. The supply format is 3 x AC, meaning the controller rectifies incoming three-phase power before pulse-width modulating the inverter stages. A line-voltage tolerance of ±10 % allows the drive to continue operating through moderate dips or swells without nuisance trips. Internal current and flux loops use field-oriented vector control, so the drive adjusts stator current in real time to maintain commanded torque as load conditions change.
The power section includes a built-in brake chopper that dissipates regenerative energy during rapid deceleration and helps prevent overvoltage on the DC bus. An integrated line filter reduces conducted emissions, which can simplify installation where electromagnetic compatibility is important. Heat is removed by forced air cooling, and the fans move air across the heat sinks to keep semiconductor temperatures within their operating range during sustained load. The controller follows Design Generation 1, which matches the first RD 500 platform release. This arrangement supports repeatable motor control in equipment that cycles between acceleration, constant speed, and braking.
Frequently Asked Questions about RD52.1-4B-055-L-NN-NN-NN-FW:
Q: What is the rated power capacity of the RD52.1-4B-055-L-NN-NN-NN-FW drive controller?
A: This drive controller has a rated power output of 55 kW, enabling it to handle demanding motor applications.
Q: Does the RD52.1-4B-055-L-NN-NN-NN-FW include a brake chopper?
A: It features a built-in brake chopper, providing dynamic braking functionality without external accessories.
Q: What cooling method is used in the RD52.1-4B-055-L-NN-NN-NN-FW drive controller?
A: The RD52.1-4B-055-L-NN-NN-NN-FW uses forced air cooling to maintain optimal operating temperatures.
Q: What voltage range is supported by the RD52.1-4B-055-L-NN-NN-NN-FW controller?
A: This drive controller supports a voltage range from 380 to 480 V for flexible power connection.
Q: What control type does the RD52.1-4B-055-L-NN-NN-NN-FW utilize for motor regulation?
A: Field oriented vector control is the control type on this model, allowing for precise motor operation.
