Product Description:

The RD51.1-5N-200-R-V1-FW is a drive controller manufactured by Bosch Rexroth Indramat and assigned to the RD 500 Drive Controllers series. It serves as the central power stage for three-phase induction motors in automated machinery. By adjusting output voltage and frequency, the unit matches motor operation to changing load demands and supports efficient speed control on production lines. It is suited to process equipment that requires continuous variable-speed operation rather than fixed-speed motor control.

This model is supplied without a built-in brake chopper, so regenerative energy from decelerating loads requires an external braking unit. Motor excitation follows U/f curve control, which maintains motor flux across the selected speed range for stable torque output. This control method is commonly used where predictable induction motor behavior is needed through a broad operating range. Thermal management relies on liquid cooling with an internal pump, a configuration used on units rated at 132 kW and above to keep semiconductor temperatures stable under heavy load. Power is drawn from a three-phase AC converter supply, which feeds the DC link before the inverter section delivers controlled output to the motor terminals.

The DC link is charged from a mains span centered on a 500 V input range, allowing installation on suitable factory power systems without an isolation transformer. The control electronics remain active through an external 24 V standby power source, so communication and stored parameters can remain available during a mains interruption. This arrangement helps the control section stay responsive even when the main supply is temporarily unavailable. The inverter can deliver up to 200 kW of mechanical output, which suits large pumps, fans, and extruders that operate under sustained load. The unit is part of design generation 1, which keeps it aligned with accessories from the same generation.