Due to Electro-Craft being acquired and rebranded (first by Rockwell Automation/Allen-Bradley, then by KB Electronics, and now under the "Electro-Craft" brand again via Kollmorgen), original manuals have become fragmented. Here are the most reliable ways to locate the PDF:
Look for Rockwell Automation publication codes (e.g., series manuals often cross-reference BRU series hardware).
: Manufactured in the USA, originally under the Reliance Motion Control / Electro-Craft brand. Control & Interface Capabilities
The ElectroCraft BRU-105 is a legacy high-performance brushless servo drive designed for precision motion control. Finding the original documentation is essential for troubleshooting, wiring, and tuning these units in industrial environments. electrocraft bru 105 manual.pdf
| Parameter | Value | |-----------|-------| | Input voltage | (from PDF) | | Continuous current | (from PDF) | | Peak current | (from PDF) | | Control method | Sinusoidal / trapezoidal (check) |
The Electro-Craft BRU-105 is a classic, high-performance brushless servo drive widely used in industrial automation, CNC machinery, and robotics. Built by Reliance Electric (and later supported under the Rockwell Automation / Allen-Bradley umbrella), this drive is known for its durability. However, keeping legacy automation systems running smoothly requires precise technical data.
KB Electronics currently maintains the legacy Electro-Craft product documentation. Navigate to their support section and search for "BRU-105" or "BRU Series." They offer PDFs for download, though registration may be required. Due to Electro-Craft being acquired and rebranded (first
If down-time is critical, consider retrofitting the system with a modern Allen-Bradley Kinetix drive or a universal analog servo drive. Modern drives offer digital tuning software, eliminating the need to manually adjust analog potentiometers.
The Electro-Craft BRU-105 manual serves as the primary resource for installing and maintaining this legacy sinusoidal brushless servo drive, detailing its capabilities as an analog velocity, stepper replacement, or indexing drive. It covers operational modes—including torque and auto-tune—and highlights necessary safety features like external Emergency Stop circuits. To view the document, access the ElectroCraft Downloads page or industrial archives such as Scribd .
The BRU-105 datasheet and technical records list the following parameters: : 20 Amps. Voltage : 80 V. Dimensions : Approximately 20.3 cm x 12.7 cm x 5.1 cm. Weight : 0.5 kg (unit only) to ~9.5 lbs (packaged). Origin : Manufactured in the USA. Functional Features Control & Interface Capabilities The ElectroCraft BRU-105 is
Single-phase or three-phase AC input (typically 100-240 VAC depending on the sub-model).
Industrial automation relies heavily on legacy hardware that refuses to quit. The (often cataloged under Reliance Electric or Rockwell Automation) is a prime example of a rugged, dependable brushless servo drive.
The is a legacy brushless servo drive designed for high-performance motion control applications . While the manufacturer has discontinued the unit, it remains a staple in many industrial systems due to its reliability and precise control over brushless motors.
Connect the three-phase motor leads to the drive output terminals. Ensure the ground wire is securely bonded to the drive’s chassis ground terminal. 2. Feedback Interface
Adjusts the scaled analog voltage output that mimics a tachometer signal for external controller loops. 5. Troubleshooting Common BRU-105 Faults
