Product Description:

The DKR04.1-W400N belongs to the DKR Drive Controllers series from Bosch Rexroth Indramat. It is classified as a Digital Intelligent AC Drive Controller and is intended to govern high-power servo or induction motors in automated machinery. The “04” portion identifies the line series, while the suffix W400N indicates a nominal 400 A frame in design version 1. In production cells or test stands, this unit provides closed-loop torque and speed regulation so mechanical axes operate consistently under changing loads.

At a switching frequency of 4 kHz, the drive can deliver a continuous armature current of 210 A, enabling high dynamic response for acceleration-intensive duty cycles. Under the same conditions, it supports a continuous shaft power of 93 kW, which is the thermal limit for sustained mechanical output. Logic and interface electronics are energized from an AC 230 V control supply that tolerates a ±10% fluctuation, helping keep the processor and I/O stable when mains levels drift. Internal heat is removed by a built-in air blower, and this forced-air path allows the device to dissipate a total of 2500 W without external ducting. During brief overload events, the inverter can furnish a peak output of 282 A, supporting rapid load changes before current foldback occurs.

The power section is supplied through a rigid DC bus without a brake chopper or bleeder, so excess regenerative energy must be handled by the mechanical system or an external resistor. Mains input can range from 3 x AC 400–480 V with a ±10% tolerance, matching common factory power grids. Despite its output capacity, the unit weighs 150 kg, which should be considered during mounting and handling. This combination of electrical capacity and physical mass suits applications that require a high-power drive in a fixed cabinet installation.