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Description
Product Overview
The ABB NBRA-669C is a high-performance external brake chopper module engineered specifically for the ABB ACS800 series industrial drives, designed to handle the demanding braking requirements of high-inertia applications. As an integral component of the NBRA family of dynamic braking solutions, the ABB NBRA-669C provides a robust and reliable means of dissipating regenerative energy generated during motor deceleration, preventing dangerous DC bus overvoltage conditions that could trip the drive or damage sensitive components.
The ABB NBRA-669C is purpose-built for use with ACS800 series three-phase inverters of frame size R8, operating at 690V AC input. It functions by continuously monitoring the intermediate DC link voltage; whenever this voltage exceeds a predefined threshold (typically around 1120V DC for 690V systems), the module’s IGBT switching element rapidly connects an external braking resistor to the DC bus, channeling excess energy into heat. This intelligent control mechanism, implemented through the NBRC-61 control board, ensures that braking occurs only when necessary, optimizing energy efficiency and system stability. With a peak braking power capacity of 375 kW for short-duty cycles and a continuous rating of 13.5 kW, the ABB NBRA-669C is exceptionally well-suited for applications involving cranes, hoists, centrifuges, and other high-inertia loads where controlled deceleration is paramount. The module’s robust design supports parallel operation, allowing multiple ABB NBRA-669C units to be connected for even greater braking power in the most demanding industrial environments.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | NBRA-669C |
| Manufacturer | ABB |
| Product Type | Brake Chopper Module (External Dynamic Braking Unit) |
| Applicable Equipment | ACS800 Series Drives, Frame Size R8, 690V 3-Phase Inverters |
| ABB Ordering Codes | 59011065 (primary), 59012517, 3ABD58984124 |
| Peak Braking Power | 375 kW (10-30 second duty cycle) |
| Continuous Braking Power | 13.5 kW |
| Minimum External Resistor | 2.7 Ω (recommended: 3×9 Ω in parallel) |
| DC Bus Voltage Threshold | Approx. 1120V DC (turn-on), 1096V DC (turn-off) for 690V systems |
| Operating Temperature | -10°C to +50°C |
| Storage Temperature | -40°C to +85°C |
| Dimensions (W×D×H) | 334 × 240 × 583.5 mm |
| Weight | Approx. 24 kg |
| Enclosure Protection | IP00 (cabinet installation required) |
| Mounting | Rear-mounted, 4×7 mm holes |
| Cooling | Natural convection with forced cabinet airflow |
| Certifications | CE, UL, cUL |
| Protection Features | Overvoltage, Overcurrent, IGBT Overtemperature, Resistor Fault Detection |
Main Features and Advantages
High-Power Braking Performance for Heavy-Duty Applications: The ABB NBRA-669C delivers industry-leading braking power, capable of dissipating 375 kW of regenerative energy during peak demand periods of 10 to 30 seconds. This exceptional capacity ensures that even the most demanding deceleration events—such as emergency stops of large cranes or rapid deceleration of high-inertia centrifuges—are managed safely and effectively. For extended braking requirements, the ABB NBRA-669C maintains a continuous dissipation rating of 13.5 kW, providing reliable, long-duration braking without risk of thermal overload. The module’s built-in thermal management system, featuring an integrated heatsink and compatibility with forced-air cooling, ensures stable operation even at maximum output.
Precise IGBT-Based Control with Intelligent Monitoring: At the heart of the ABB NBRA-669C lies an advanced IGBT chopper topology controlled by the sophisticated NBRC-61 control board. This intelligent system continuously monitors the DC link voltage and compares it against the drive’s configured thresholds, ensuring that the ABB NBRA-669C activates only when necessary, minimizing unnecessary energy consumption and thermal stress on system components. The module supports the use of an optional NRED voltage reducer board to protect the control electronics from voltage peaks, providing an additional layer of reliability in electrically noisy environments.
Flexible Parallel Configuration for Scalable Braking Power: The ABB NBRA-669C is designed with system scalability in mind, supporting parallel operation of multiple modules to achieve higher total braking power. In ABB ACS880-604 drive systems, it is common to see up to six ABB NBRA-669C units operated in parallel, delivering a combined braking capacity of over 2.4 MW. This modular approach allows engineers to tailor the braking capability to the exact requirements of the application, providing cost-effective scalability and redundancy.
Robust and Serviceable Design for Long Service Life: Constructed for demanding industrial environments, the ABB NBRA-669C features an IP00-rated open-frame design intended for installation within a protected cabinet. The module’s heavy-duty construction, with a weight of 24 kg and a compact footprint of 334×240×583.5 mm, ensures long-term mechanical stability. The ABB NBRA-669C also features replaceable cooling fans (ordering code 64114158), facilitating routine maintenance and extending the operational lifespan of the unit.
