Product Description:

The DKR04.1-W400E-BA04-01-FW is a digital intelligent AC drive controller produced by Bosch Rexroth Indramat within the DKR Drive Controllers series. Designed for multi-axis machining centers, press automation, and other heavy-duty tasks, the unit converts three-phase mains power into precisely regulated motor energy while monitoring current, voltage, and feedback to keep motion within commanded limits. By combining high-frequency switching with microprocessor regulation, the controller works as the intermediary between plant power and large servomotors, providing stable torque, rapid acceleration, and coordinated braking in automated lines. This arrangement supports precise axis control during demanding duty cycles and changing load conditions.

The drive’s power section accepts 3×AC 400–480 V ±10%, while the control electronics use AC 230 V ±10%. Motion commands enter through an analog interface, and feedback can come from digital servo encoders or resolver signals. At a switching frequency of 4 kHz, the converter supplies a continuous current of 210 A and supports 93 kW of output without thermal derating. The built-in blower pushes air through heat-sink channels to remove switching losses, so the enclosure can be mounted in cabinets with limited airflow. A rigid DC link ties the internal chopper to the braking circuit to keep the bus stable when regenerative energy returns.

During short acceleration bursts, the current stage can supply up to 282 A, giving machines the reserve needed to overcome static loads or to apply dynamic braking through the integrated chopper. Excess energy is routed to an external bleeder, preventing DC-bus overvoltage while keeping component stress low. Even with active braking, total thermal losses stay within 2500 W, a figure that helps determine panel ventilation needs. The housing and blower assembly bring the controller mass to 150 kg, so mounting rails must support it securely. The unit requires secure cabinet mounting and clear airflow around the cooling path.