Product Description:

The RD52.1-4B-030-L-V1-FW is an inverter from Bosch Rexroth Indramat in the RD 500 Drive Controllers series. This unit serves as the central power stage between a plant’s three-phase mains and an AC motor, providing the speed and torque regulation required in material-handling, printing, and processing lines. By modulating output frequency and voltage, it matches motor performance to changing loads and supports smooth acceleration, steady running, and controlled deceleration during production. That operating approach also helps reduce mechanical shock on belts, rollers, and couplings when machine demand changes quickly.

Its continuous output is rated at 30 kW, which is the maximum continuous motor power the drive can deliver without derating. The input section accepts a mains window of 380 to 480 V and is sized for a three-phase AC converter supply, so the unit can be connected to common industrial power systems. Dynamic braking energy is routed into the internal resistor by a built-in brake chopper, which avoids the need for a separate braking module during rapid stops. Motor flux and torque are calculated in real time through field-oriented vector control, which improves low-speed response and short-term overload performance compared with open-loop volts-per-hertz operation. The wide input range also supports installation in facilities that use different nominal line voltages within the same product family.

Thermal management relies on forced-air cooling, with a heat sink and fan moving ambient air through the chassis so the electronics can run at full load without an external heat exchanger. Line-borne interference is reduced by an integrated mains filter, allowing the controller to operate within plant EMC limits while the supply remains inside the specified ±10 % tolerance band. An external power rail provides 24 V standby power, which keeps the control logic active when the inverter power stage is de-energized. This arrangement supports orderly shutdown behavior and keeps communication and status functions available until main power is restored. It also allows monitoring circuits to remain active during controlled stops or short interruptions to the primary supply.