Product Description:

The RD51.2-4B-015-P-A1-FW is a three-phase converter drive controller built by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. It regulates induction motor speed in automated machinery by adjusting output frequency and voltage to match load requirements. This supports coordinated motion and energy management across production lines. By varying the electrical output sent to the motor, the controller helps reduce abrupt mechanical stress during routine speed changes.

This model delivers a rated output of 15.0 kW and operates on a mains window of 380 to 480 V, so it can be installed on common industrial power systems without an autotransformer. Line deviations up to ±10 % are tolerated before derating occurs. Motor excitation follows U/f curve control; by maintaining a fixed volts-per-hertz ratio, the unit keeps magnetic flux constant during speed changes. A built-in brake chopper dissipates regenerative energy into an external resistor, preventing DC-bus overvoltage during rapid deceleration. The converter uses a 3 × AC supply arrangement that integrates rectifier and inverter stages plus a pre-charged DC link for smooth start-up.

Thermal management is provided by a heat dissipation panel rated for frames up to 18.5 kW. This allows cabinet mounting without forced ventilation. The controller belongs to design generation 2, which standardizes terminal locations and parameter structure across the series. An integrated mains filter attenuates conducted interference, so external RFI components are unnecessary in most installations. Protective functions include external standby power to maintain control electronics during main-disconnect events and a starting lockout that inhibits unintended motor rotation after power is restored.