Product Description:

The RD52.1-8N-055-L-L1-FW belongs to the RD 500 Drive Controllers series produced by Bosch Rexroth Indramat. Within an automation cell, this drive controller links a common DC bus to a single motor axis, delivering regulated current and frequency so the attached machine follows commanded speed or torque profiles. Its role is to translate motion commands from a higher-level PLC into precise motor responses, allowing coordinated indexing, tensioning, or positioning tasks in packaging, conveyor, and processing equipment.

This model employs field oriented vector control, a regulation method that decouples flux and torque so dynamic response is maintained even at low shaft speeds. A continuous output of 55 kW enables it to run medium-power induction or synchronous machines without derating under nominal conditions. The DC link it draws from may rise to 700 V, and all internal components are rated for this potential to keep switching losses and cable currents within design limits. Thermal energy created by high carrier frequencies is removed through forced air cooling, so panel airflow must be maintained to avoid heat soak. Because the controller expects an Inverter DC supply, it is normally paired with an RD 500 rectifier or a shared bus system rather than being wired directly to three-phase mains.

The unit ships without a built-in brake chopper, so external braking hardware is required when rapid deceleration or overhauling loads generate surplus energy. Classified as design generation 1, it follows the mechanical footprint and parameter structure of the earliest RD 500 releases, which supports use in legacy cabinets. The control card’s program memory is blank at delivery, and firmware is ordered as a separate subposition so the drive can be loaded with the correct motion functions. Diagnostic channels also provide cable-damping feedback (C3, D3), which helps compensate for motor-lead resonance when long shielded cables separate the inverter from the motor.