Product Description:

Bosch Rexroth Indramat's DKR04.1-W400E-BE74-02-FW is a digital intelligent AC drive controller in the DKR Drive Controllers series. The unit coordinates high-power servo axes in machining centers, presses, and handling equipment by modulating motor voltage and current through a rigid DC bus with an integrated brake chopper. It links the drive section to an automation host and governs position, velocity, and torque loops for synchronous and asynchronous motors. It is commonly used where large motors must respond quickly to setpoint changes without unstable current behavior.

Power for the controller is drawn from a mains window of 3 x AC 400 to 480 V (±10%), while the internal electronics are supported by a separate AC 230 V (±10%) control supply. Command data are exchanged over the SERCOS interface, allowing deterministic fiber-optic communication with PLCs and other motion-control hardware. This model uses a 4 kHz switching frequency and delivers a continuous output current of 210 A, which corresponds to about 93 kW with compatible motors. Digital servo and resolver feedback channels are accepted so the regulator can close high-resolution position loops without additional interface cards.

Short-duty boosts are accommodated by a peak current ceiling of 282 A, and excess regenerative energy is routed to an external bleeder through the integrated brake chopper on the rigid DC link. Thermal management relies on a built-in air blower that directs airflow across the power modules, keeping total losses near 2500 W during rated operation. The enclosure layout must allow clear fan inlets and discharge paths so the cooling stream is not restricted during continuous use. The cabinet must also support the unit's 150 kg mass and provide enough clearance around the drive body for installation and cable routing.