Product Description:

The DKC21.3-200-7-FW drive controller is produced by Bosch Rexroth Indramat for the DKC Drive Controllers series. The unit functions as the central power and control stage in an EcoDrive axis, converting rectified supply power into a commanded three-phase output that follows velocity or position references from higher-level motion controls. It operates in industrial automation cells where rapid indexing, synchronized conveyor motion, or coordinated multi-axis profiles are required. By providing programmable current loops and integrated monitoring, the controller allows connected motors to accelerate, brake, and hold process loads with consistent accuracy while protecting both winding insulation and the upstream supply network.

Its continuous phase capability is 200 A, the limit the IGBT bridge can supply without derating, allowing one controller to drive large servo axes. The DC link is held at 700 V nominal; this steady bus provides the reference from which pulse-width modulation creates the motor waveform. A line-side commutation choke is sized for 70 A rms, restricting harmonics sent back to the mains, and its insulation withstands DC 900 V to the negative rail to avoid flashover during regeneration. Bosch Rexroth designates the product family as EcoDrive, indicating that recovered energy can be returned to the plant distribution instead of being dissipated.

Configuration codes further define compatibility. The hardware is identified as Design 3, and the accompanying firmware slot shares the same revision, noted as Design Version 3; matching numbers ensure parameter files load without adaptation. Communication is selected through Interface Option 21, providing the fieldbus signals expected by peer drives inside the same cabinet. Finally, the internal build indicator, Series 21, ties this unit to accessories—such as feedback cables and extension chokes—released for the same production cycle, allowing straightforward spare-part management and cabinet standardization.

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