RD51.2-4B-003-L-A1-FW Bosch Rexroth Indramat
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MPN: R911201009
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The Bosch Rexroth Indramat RD51.2-4B-003-L-A1-FW belongs to the RD 500 Drive Controllers series and is designed as a 3.0 kW drive controller. It uses U/f curve control, features a built-in brake chopper and an integrated mains filter, and supports converter supply of 3 x AC at a voltage range of 380 to 480 V. Forced air cooling is used and the unit includes functions such as external stand-by power and starting lock-out.
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Product Description:
The RD51.2-4B-003-L-A1-FW is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It is installed between the mains supply and a three-phase induction motor to regulate output voltage and frequency according to process demand. In conveyor, pump, and fan systems, the unit adjusts motor speed so the driven equipment follows changing load conditions instead of operating at a fixed full-speed point. This operating method helps smooth acceleration, reduces abrupt mechanical loading, and supports steadier process control in everyday industrial service.
The controller has a nominal output of 3.0 kW, which suits medium-sized motor applications in general plant equipment. Heat is removed by forced air cooling that moves cabinet air across the heat sink, helping the power section remain within its thermal range during continuous use. The permissible line voltage is 380 to 480 V, and motor flux is managed with U/f curve control so the volts-per-hertz ratio stays consistent as speed changes, which supports predictable torque behavior across the operating range. For deceleration duty, a built-in brake chopper can route excess DC-bus energy to an external resistor, helping control overvoltage when the motor slows a rotating load with significant inertia.
The controller allows a line tolerance of ±10%, which helps it continue operating through modest mains variation during normal plant conditions. To reduce conducted interference, the power stage includes an integrated mains filter. Grid input uses a three-phase AC converter topology, making the unit suitable for industrial power systems within the stated voltage range and aligning it with standard three-phase motor installations. The hardware is design generation 2, and the control features include stand-by power from an external source together with a starting lockout function that helps prevent unintended motor starts after a stop condition or power restoration.
Frequently Asked Questions about RD51.2-4B-003-L-A1-FW:
Q: Does the RD51.2-4B-003-L-A1-FW include a brake chopper?
A: This model has a built-in brake chopper for efficient energy dissipation during motor deceleration.
Q: What control type does the RD51.2-4B-003-L-A1-FW drive employ?
A: The RD51.2-4B-003-L-A1-FW uses U/f curve control for regulating motor performance.
Q: How is the RD51.2-4B-003-L-A1-FW drive controller cooled?
A: This drive controller features forced air cooling to maintain optimal operating temperatures.
Q: Is a mains filter included in the RD51.2-4B-003-L-A1-FW?
A: A mains filter is integrated into the RD51.2-4B-003-L-A1-FW for reduced electrical interference.
Q: What input voltage range does the RD51.2-4B-003-L-A1-FW support?
A: The RD51.2-4B-003-L-A1-FW operates within a voltage range of 380 to 480 V with a ±10% tolerance.
