Product Description:

The DKR04.1-W300N-BA05-01-FW is a digital intelligent AC drive controller manufactured by Bosch Rexroth Indramat for the DKR Drive Controllers series. Within the naming code, it is identified as line series 04, design version 1, and function module version 01, with a current rating of 300. The unit operates with a rigid DC bus because it is delivered without a brake chopper, so excess regenerative energy must be handled externally. Its closed-loop regulation works with digital servo and resolver feedback, enabling position and speed control of large servo or spindle motors in automated production cells.

The drive accepts a control supply of AC 230 V, ±10% and energizes its power stage from 3 x AC 400–480 V, ±10%. Command signals reach the controller over an Analog interface, allowing straightforward integration with motion cards that output ±10 V velocity or torque references. Because the command path is analog, the controller can also be paired with legacy motion hardware that does not use a digital fieldbus. At a 4 kHz switching frequency, the inverter can deliver a continuous armature current of 185 A, translating into a continuous shaft output of approximately 82 kW. The separate low-voltage control bus keeps logic circuits isolated from mains disturbances during operation.

For transient acceleration or deceleration demands, the inverter supplies a peak current of 212 A, giving machines short-term torque reserve without oversizing the entire power stage. Internal thermal losses are removed by built-in air blower cooling, and the resulting waste heat amounts to 2250 W. With a transport and mounting mass close to 150 kg, the controller typically occupies a low position in a control enclosure to help maintain structural stability. Its cooling method and mass should be considered when planning cabinet airflow and support structure.