RD51.2-4B-018-L-A2-FW Bosch Rexroth Indramat
Wake Industrial LLC is not an authorized distributor of this product.
Wake Industrial LLC is not an authorized distributor of this product.
MPN: R911201495
Ask for AvailabilityThe Bosch Rexroth Indramat RD51.2-4B-018-L-A2-FW is a drive controller from the RD 500 Drive Controllers series. It supports U/f curve control and is rated for 18.5 kW of power with a voltage range of 380 to 480 V. The controller features a built-in brake chopper, integrated mains filter, and uses forced air cooling.
Internal Product Review
The RD51.2-4B-018-L-A2-FW is a drive controller with U/f curve control and a built-in brake chopper. Forced air cooling and an integrated mains filter support clean, stable operation in demanding industrial drive systems. Rated at 18.5 kW for 380 to 480 V service, the unit stands out as a strong choice for medium-power converter applications.
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Product Description:
The RD51.2-4B-018-L-A2-FW is a drive controller manufactured by Bosch Rexroth Indramat and assigned to the RD 500 Drive Controllers series. It regulates the speed and torque of induction motors in factory automation lines by converting fixed-frequency mains power into a variable output that follows the programmed profile. This arrangement supports stable motor operation in applications such as conveyors, pumps, and other process equipment where controlled acceleration, deceleration, and speed holding are required. Because the drive adjusts output frequency and voltage to match demand, it can reduce unnecessary full-speed operation in variable-load systems.
The controller uses forced air cooling to carry heat away from the power electronics, so cabinet ventilation must sustain continuous airflow. Motor voltage is modulated with U/f curve control, which helps keep magnetic flux roughly constant as frequency changes and limits the risk of saturation at low speeds. The inverter bridge is sized for an 18.5 kW motor load, giving suitable capacity for common industrial duty. The controller accepts a 380–480 V AC supply, and during rapid deceleration excess energy is routed into a built-in brake chopper so separate resistor switching hardware is usually unnecessary. That control method is useful in duties where the motor must start smoothly and continue running over a broad speed range.
An integrated mains filter reduces conducted emissions and helps simplify installation in electrically noisy environments. The power stage is arranged as a 3-phase AC converter, and the unit tolerates line variation up to ±10 % input tolerance without output derating under normal conditions. Control circuitry can remain energized through external stand-by power, which allows communication and diagnostic access while the main stage is locked out by the starting interlock function. This separation between control power and the main power path helps keep operating status visible when motor output is intentionally disabled.
