Product Description:

The RD52.1-4N-315-R-V1-FW belongs to the RD 500 Drive Controllers series produced by Bosch Rexroth Indramat. It is a drive controller intended to regulate large three-phase induction or synchronous motors in automated machinery, providing speed and torque control within production cells, test stands, and material-handling lines. Its control behavior is suited to applications that need stable motor response during startup, acceleration, load changes, and continuous operation.

This model accepts a line voltage between 380 to 480 V from a three-phase AC supply and can deliver up to 315 kW of output power. Closed-loop regulation is performed with field-oriented vector control, enabling precise flux and torque response for dynamic load profiles. Internal regulation tolerates input fluctuations of ±10 %, so the controller can maintain commanded operating values without additional line conditioning. Thermal energy from the power stage is removed through liquid cooling with an internal pump, which is used on units rated at 132 kW and higher to keep semiconductor temperatures controlled during continuous operation. Because the unit is supplied as a converter, it does not require a separate front-end rectifier.

The power stack is shipped without a built-in brake chopper, so any dynamic-braking resistor must be connected through an external chopper module when rapid deceleration is required. Harmonic mitigation on the mains side is handled by the integrated mains filter, which helps reduce conducted EMI into adjacent equipment. Control electronics remain active during power loss because the unit uses 24 V standby power supplied from an external source. The controller follows design generation 1, which corresponds to the first iteration of the RD 500 platform.