DKC21.3-040-7-FW Bosch Rexroth Indramat
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MPN: R911281390
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The Bosch Rexroth Indramat DKC21.3-040-7-FW is part of the DKC Drive Controllers series and is designed as an EcoDrive. This controller has a rated current of 40 Amps and operates at a nominal DC-bus voltage of 700 Volts, with a maximum output frequency of 400 Hz. It features IP20 protection, measures 360 mm in height by 65 mm in width by 261 mm in depth, and can be installed up to 1000 meters altitude.
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Product Description:
The DKC21.3-040-7-FW is a drive controller produced by Bosch Rexroth Indramat within the DKC Drive Controllers series. As an EcoDrive unit, it converts incoming DC-bus energy into regulated three-phase output for synchronous and induction motors used in positioning, conveying, and packaging lines. The controller forms the power stage between a PLC and the actuator, providing voltage modulation, current limiting, and braking energy handling for closed-loop industrial motion.
Its power section operates on a DC bus set at 700 V and can deliver a continuous phase current of 40 A. At a switching frequency of 4 kHz, the inverter reaches a maximum output frequency of 400 Hz, allowing high-speed servo operation. Internal losses during normal load amount to 180 W, and the housing carries a protection rating of IP20, so the unit must be mounted inside a cabinet. The controller belongs to design version 3 with interface option 21 in the series 21 family, indicating its product revision and interface arrangement. Dynamic braking is absorbed by a continuous bleeder rated at 0.15 kW with a peak energy capacity of 5.0 kWs. A 60 Ω soft-start resistor with the same 0.15 kW rating limits inrush when the DC bus capacitor is first charged, helping reduce electrical stress during startup.
Mechanically, the controller measures 261 mm in depth, stands 360 mm tall, and is 65 mm wide, so multiple axes can be installed side by side on a panel rail while maintaining airflow clearance. Its aluminum heat sink is sized for a nominal DC-bus capacitance of 0.27 mF, which supports short transients and improves voltage stability during rapid load changes. The unit is specified for operation up to 1000 m above sea level without derating. At greater elevations, lower air density requires current and temperature reductions to keep the electronics within safe operating limits.
Frequently Asked Questions about DKC21.3-040-7-FW:
Q: What is the rated current for the DKC21.3-040-7-FW drive controller?
A: The DKC21.3-040-7-FW supports a rated current of 40 A for operational use.
Q: What is the DC-bus nominal voltage of the DKC21.3-040-7-FW?
A: This model features a DC-bus nominal voltage of 700 V.
Q: What type of protection is offered by the DKC21.3-040-7-FW?
A: The DKC21.3-040-7-FW provides protection rated at IP20.
Q: What is the maximum installation altitude for the DKC21.3-040-7-FW?
A: Maximum allowable installation altitude for the DKC21.3-040-7-FW is 1000 meters.
Q: What is the maximum output frequency of the DKC21.3-040-7-FW?
A: This unit can handle a maximum output frequency of 400 Hz when operating at 4 kHz switching frequency.
