DKC21.3-100-7-FW Bosch Rexroth Indramat
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MPN: R911281391
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The Bosch Rexroth Indramat DKC21.3-100-7-FW is part of the DKC Drive Controllers series and is designed for EcoDrive applications. It has a rated current of 100 Amps, a continuous current of 40 Amps at 4 kHz, and a peak current of 100 Amps. The drive controller operates at a DC-bus nominal voltage of 700 Volts and features an IP20 degree of protection.
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Product Description:
The DKC21.3-100-7-FW is an EcoDrive digital drive controller manufactured by Bosch Rexroth Indramat for the DKC Drive Controllers series. It works as the power and regulation stage between an automation system and its servo motors. The unit converts DC-bus energy into precisely modulated three-phase output so closed-loop axes can position accurately, follow speed commands, or generate constant torque in industrial machinery. This controller is used in servo systems where stable current regulation and repeatable motion are needed for feed axes, indexing stations, and similar automated equipment.
A DC link maintained at 700 V supplies the internal inverter bridge, while continuous armature current is supported at 40 A when the switching frequency is set to 4 kHz. The controller has an IP20 protection category, which supports cabinet installation in controlled industrial enclosures. For high-bandwidth positioning tasks, its output stage reaches a maximum frequency of 800 Hz at 8 kHz PWM, allowing fast response with reduced motor cogging. Thermal loading from semiconductor switching is limited by a device power dissipation of 420 W, so enclosure cooling must remove that heat during operation. Startup inrush is reduced by a 24 Ω soft-start resistor rated at 0.5 kW, and excess regenerative energy can be directed into a 6 Ω brake resistor. That operating range allows the drive to support responsive speed changes and smooth torque production in demanding motion profiles. Interface option code 21 provides the command and feedback channels used by this version of the controller.
For short overload periods such as rapid acceleration, the inverter can deliver a peak output of 100 A before returning to its continuous rating. The controller permits ambient moisture up to 95% relative humidity and an absolute humidity of 25 g/m³, provided condensation does not form inside the unit. Operation is permitted from +5 °C to +45 °C, and full current capability is maintained at installation heights up to 1000 m above sea level. The housing is also rated to withstand 15 g half-sine shocks lasting 11 ms, which helps protect the unit during transport, installation, and normal cabinet handling.
Frequently Asked Questions about DKC21.3-100-7-FW:
Q: What is the peak current rating of the DKC21.3-100-7-FW drive controller?
A: The DKC21.3-100-7-FW controller has a peak current rating of 100 A.
Q: What is the DC-bus nominal voltage requirement for the DKC21.3-100-7-FW?
A: This drive controller operates at a DC-bus nominal voltage of 700 V.
Q: What degree of protection is provided by the DKC21.3-100-7-FW?
A: The DKC21.3-100-7-FW controller is manufactured with a degree of protection rated at IP20.
Q: What is the maximum installation altitude for the DKC21.3-100-7-FW controller?
A: This model can be operated at a maximum installation altitude of 1000 meters.
Q: What ambient temperature range can the DKC21.3-100-7-FW tolerate during operation?
A: The ambient temperature range for safe operation is between +5 °C and +45 °C.
