Product Description:

The RD52.1-4B-075-L-V1-FW is a Bosch Rexroth Indramat drive controller from the RD 500 Drive Controllers series. Designed for cabinet installation, the unit converts fixed utility power into adjustable voltage and frequency for controlled motor operation in automated machinery, conveyors, and processing lines. By using vector-based algorithms and integrated power electronics, the controller supports rapid speed changes, reliable torque production, and coordinated motion sequences in industrial automation. This generation-1 design also supports external low-voltage backup so parameter memory and diagnostic access remain available when the main supply is off.

It delivers a rated output of 75 kW, which indicates the continuous power available for the connected motor. The device accepts a supply between 380 to 480 V and maintains normal operation when voltage remains within ±10 %, helping it tolerate moderate mains variation. Motor regulation is achieved through field-oriented vector control, a method that independently modulates stator flux and torque-producing current for stable low-speed performance and responsive control under changing loads. An integrated mains filter reduces line-borne interference to support electromagnetic compatibility within the plant.

For rapid deceleration, the drive incorporates a built-in brake chopper that directs regenerative energy to an external resistor instead of the DC link. Thermal management relies on forced air cooling, and a dedicated fan moves ambient air across heat-sink fins to support full-load operation in enclosed cabinets. The power section uses a three-phase AC converter design, so it rectifies the mains, builds a DC bus, and inverts it back to variable AC for the motor. Control electronics can stay energized by the plant’s 24 V standby power line, preserving communication and diagnostic access when the main supply is isolated.