Product Description:

The DKR04.1-W300N-BE79-01-FW is a drive controller produced by Bosch Rexroth Indramat for the DKR Drive Controllers series. As a digital intelligent AC drive controller, it supplies regulated three-phase power to large servo or spindle motors in automated machining centers, presses, and handling systems. It translates command data from higher-level controllers into torque and speed commands for controlled axis motion. This arrangement lets the controller support both velocity-regulated spindle duties and positioning tasks on servo axes. Its design version 1 and line series 04 show its place in the product range, while function module version 01 indicates the installed control configuration.

During continuous duty at a 4 kHz switching frequency, the unit delivers 185 A of output current, which corresponds to about 82 kW of mechanical power for the connected axis. The control electronics run from a stabilized supply of AC 230 V ±10%, separate from the main power stage that accepts 3 × AC 400 to 480 V ±10%. Keeping the control supply separate from the main input helps the regulation electronics remain stable during changes in motor load. Momentary overloads are handled by a peak current ceiling of 212 A, yet the DC bus does not include a bleeder or brake chopper, so regenerated energy cannot be dissipated internally. Its current class of 300 guides feeder sizing, and the drive can process digital servo or resolver feedback for precise position control.

Heat produced by the power electronics, up to 2250 W, is expelled by a built-in air blower, avoiding external cooling hardware. Communication with motion controllers is handled through the SERCOS interface, allowing deterministic data exchange on fiber-optic rings. The cooling path depends on unobstructed intake and exhaust space around the housing rather than on remote ducting or liquid circuits. Because the DC bus stores regenerated energy temporarily, excess power must be returned to the mains or absorbed mechanically during deceleration. Installers should also account for the unit's mass of 150 kg and provide rigid mounting with clear airflow paths to maintain operating temperature.