Product Description:

The DKR04.1-W400N-BE33-01-FW is a digital intelligent AC drive controller manufactured by Bosch Rexroth Indramat within the DKR Drive Controllers series. It is used in industrial automation to supply regulated three-phase power to synchronous or induction motors while carrying out precise speed and torque commands from higher-level motion systems. Integrated current regulators and feedback channels allow the drive to close the torque loop directly at the machine, which helps reduce response time during complex machining, packaging, or transfer sequences. This arrangement also supports stable motor behavior when operating conditions change quickly during repeated production cycles.

At a switching frequency of 4 kHz, the controller sustains a continuous output of 210 A, which corresponds to about 93 kW of mechanical shaft power when it is matched with the appropriate motor and drivetrain. The control electronics are supplied by a dedicated AC 230 V auxiliary feed that may vary by plus or minus 10 percent without affecting operation. Real-time setpoints and diagnostic data are exchanged through the SERCOS interface, while the integrated converter accepts both digital servo feedback and resolver feedback to maintain position integrity. Thermal conditions are managed by a built-in air blower that forces cooling air across the heat sinks, allowing full-load operation without external chillers.

During transients, the drive can deliver up to 282 A, which provides added current for rapid acceleration and short-term load changes. That current is drawn from a mains supply range of 3 x AC 400–480 V, and the design does not include a brake chopper or bleeder resistor. Under steady operation, the power stage releases roughly 2500 W of heat, so the internal airflow path must carry that thermal load away from the semiconductors and other power components. The housing weighs around 150 kg, reflecting the large power section, substantial heat-sink assembly, and the overall mechanical structure required for this drive class.