Product Description:

The DKR04.1-F400 is a high-capacity drive unit manufactured by Bosch Rexroth Indramat within the DKR Drive Controllers series. It sits between the mains supply and large servo motors to regulate torque, speed, and position during demanding motion tasks. This role makes the unit suitable for automated machining cells, press lines, and material-handling systems where stable axis control is required under changing loads. It modulates motor power continuously so commanded motion can be followed with low deviation during acceleration, deceleration, and steady running.

The drive connects to the plant supply through a 3×AC 400–480 V power bus, while its internal electronics are powered by a separate AC 230 V control circuit that tolerates ±10% fluctuations. At a switching frequency of 4 kHz, the inverter can deliver a continuous armature current of 210 A, which corresponds to roughly 93 kW of mechanical output and supports medium-to-large axis groups without parallel modules. Liquid circulation across the rear plate removes switching and copper losses through liquid coolant. A nominal current rating of 400 A is used to size upstream fuses, contactors, and busbars, and the separate control supply helps keep the control section stable during normal system operation.

Transient processes such as acceleration spikes are supported by a peak output of 282 A, giving the motor extra torque headroom before current limiting begins. During full-load operation, the semiconductors, chokes, and auxiliary supplies release about 2500 W of heat, which must be removed by the same coolant circuit or by supplementary cabinet airflow. The assembly weighs 150 kg, so appropriate lifting equipment is needed during service. As a Digital Intelligent AC Drive Controller, the model includes diagnostic functions, adaptive current loops, and parameter storage that help maintain controlled drive behavior throughout operation. These functions also support routine status monitoring and fault handling while the drive is in use.