R911293621 (DKR04.1-W300N-BT71-02-FW)

Name: R911293621 (DKR04.1-W300N-BT71-02-FW)
Brand: Indramat Drives
SKU: DKR04.1-W300N-BT71-02-FW
Price: 976.00 USD
Availability: InStock

DKR Drive Controllers

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The R911293621 (DKR04.1-W300N-BT71-02-FW) is a drive controller developed by Bosch Rexroth designed for managing AC motors, including frameless spindle motors (1MB), main spindle motors (2AD, ADF), and linear motors (LSF, LAF). It supports continuous output power from 10 to 93 kW at the motor output shaft and offers interface options such as SERCOS, Profibus, INTERBUS, and analog cards. The drive controller operates within a temperature range of +5°C to +45°C and installation altitudes up to 1000 m above sea level. It is engineered for use with NC-controlled machine tools and printing machines, featuring integrated blower-based air cooling, no bleeder or brake chopper, a rigid DC bus, and accommodates rigid mounting with included components. Input is via a grounded 3xAC 400-480V supply. The unit supports digital servo and resolver feedback with a nominal current capability of approximately 300A.

Technical Specifications

Product Type
Drive Controller

Designed for
Control of AC Motors

Output Power
10 and 93 kW

Speed Range
Broad

Operable Ambient Temperature
+5° to +45° C

Operable Elevation
0 to 1000 m above sea level

Power Input
3xAC 400 V to 480 V

Emergency Stop Shutdown
Yes

Cooling with Outside or Inside Air
Yes

Mounted Components
Yes, supplied with the drive controller

Shipping
Globally available

Frequently Asked Questions

What is the significance of the rigid DC bus in the DKR04.1-W300N-BT71-02-FW?

The rigid DC bus means energy sharing between axes is possible, improving efficiency in regenerative braking. However, the system must carefully limit voltage peaks since there is no internal bleeder to absorb excess energy.

How is regen energy handled without a bleeder/brake chopper?

In this design the drive expects external means (e.g. braking resistors or energy recovery modules) to absorb excess energy. Otherwise, DC-link voltage may rise dangerously during deceleration.

Why is the choice of blower cooling important in installation?

A built-in blower requires clear airflow paths and sufficient clearance in the cabinet for heat dissipation. Poor ventilation or obstructed ducts can lead to overheating and drive derating.

In what environment should the DKR04.1-W300N-BT71-02-FW be installed?

It must operate within prescribed ambient temperature, humidity, EMC and altitude limits as defined by the DKR planning manual.

How does motor feedback type (digital servo vs. resolver) affect control in this drive?

Digital servo feedback offers higher resolution and faster loop response, improving precision. Resolver feedback is more robust under electrical noise or harsh conditions but with lower resolution.

Common Misspellings

DKR041W300NBT7102FW

DKR04 1 W300N BT71 02 FW

dkr04.1-w300n-bt71-02-fw

DKR4.1-W300N-BT71-02-FW

Internal Product Review

The DKR04.1-W300N-BT71-02-FW is a drive controller from Bosch Rexroth’s DKR series. It provides approx. 300 A current rating, uses a rigid DC bus without bleeder or brake chopper and relies on internal blower cooling. It’s commonly applied in CNC machining centers, packaging machines, and spindle/linear motor control in industrial automation.