Product Description:

The RD52.1-4B-018-L-LV-FW is a drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It belongs to design generation 1 and is intended for field installation in multi-axis automation lines where closed-loop speed and torque control are required. As a controller, it coordinates a three-phase induction or synchronous motor and routes braking energy into an internal resistor, supporting tasks that demand rapid deceleration without external hardware.

The unit executes motor regulation through field-oriented vector control, so stator currents are resolved into flux-producing and torque-producing components for dynamic response. Thermal management relies on forced air cooling; fans move cabinet air across heat sinks to keep semiconductor temperatures within limits during high duty cycles. A built-in brake chopper shunts regenerated energy when the DC link rises above threshold, preventing overvoltage trips during fast stops or overhauling loads. Rated output is 18.5 kW, matching medium-frame motors used on conveyors, extruders, or pumps. The permissible mains window spans 380 to 480 V, permitting operation on standard industrial networks without tap-changing transformers.

Power enters the converter section through a 3 × AC converter input, and phase imbalance up to ±10 % is tolerated, easing installation on utility feeds with moderate voltage deviation. An integrated mains filter moderates conducted emissions, so additional line reactors are often unnecessary for EMC compliance. Control electronics remain active during plant shutdowns through an external 24 V stand-by power supply; this low-energy source keeps fieldbus nodes alive for diagnostics and allows orderly restarts. Cable damping feedback supports C3 and D3 configurations for long motor leads.