NBRA-669C ACS800 Frame R8 Brake Chopper Brand New
Manufacturer: ABB
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Part Number: NBRA-669C
Condition：New with Original Package
Product Type: Brake Chopper Modules
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Country of Origin: Sweden
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Product Overview
The ABB NBRA-669C (3ABD58984124) serves as a critical power management component for ACS800 series 690 V three-phase inverters, specifically targeting frame size R8. This module prevents overvoltage trips by dissipating regenerative energy generated during motor deceleration. We supply this unit as 100% Brand New original equipment, ensuring the high-speed switching capabilities required for demanding applications like rolling mills, heavy-duty conveyors, and crane hoisting systems.
Technical Specifications
| Attribute | Specification Details |
| Model | NBRA-669C |
| Part Number | 3ABD58984124 |
| Compatibility | ACS800 series, 690 V, Frame Size R8 |
| Peak Braking Power | 375 kW (Duration: 10–30 seconds) |
| Continuous Power | 13.5 kW |
| Minimum Resistance | 2.7 Ω (External Resistor required) |
| Recommended Resistor | 3 × 9 Ω in parallel |
| Dimensions (W×D×H) | 334 × 240 × 583.5 mm |
| Weight | 2.6 kg |
| Protection Rating | IP00 (Requires cabinet enclosure) |
| Mounting Type | Rear-mounted via 4 × 7 mm holes |
Engineering Advantages
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Intelligent Dynamic Control: The NBRA-669C employs sophisticated monitoring algorithms to detect DC bus voltage rises. It engages external braking resistors only when necessary, which reduces thermal stress on the resistors and increases the overall energy efficiency of the drive system.
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High-Capacity Braking: With a peak output of 375 kW, this chopper handles massive inertial loads. It effectively manages the rapid deceleration of heavy machinery, preventing DC bus overvoltage and subsequent system shutdowns.
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Scalable Power Architecture: The design supports parallel operation. For applications requiring braking torque beyond the capacity of a single unit, engineers can link multiple NBRA-669C modules to scale the discharge capacity.
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Space-Optimized Rear Mounting: The slim profile and rear-mount configuration allow for seamless integration into ACS800 cabinets. This layout minimizes the footprint inside the electrical room while facilitating efficient heat dissipation through the cabinet’s existing airflow paths.
FAQs
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What is the consequence of using a resistor lower than 2.7 Ω?
Using a resistor below the specified 2.7 Ω minimum can lead to overcurrent within the chopper’s semiconductor switches, potentially causing catastrophic failure of the NBRA-669C. Always verify the parallel resistance value before commissioning.
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Can I install the NBRA-669C in a stand-alone environment?
No. This module carries an IP00 rating, meaning it lacks protection against contact or moisture. You must install it within a protected industrial cabinet or an ACS800 drive enclosure to ensure operator safety and equipment longevity.
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How does parallel operation work with the NBRA-669C?
When parallel-connected, the modules share the braking load. This configuration requires synchronized control signals from the ACS800 inverter to ensure that all choppers engage simultaneously, preventing any single unit from absorbing the entire regenerative surge.
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Is the NBRA-669C compatible with 400V or 500V ACS800 variants?
The NBRA-669C is specifically optimized for 690 V systems. Using this module on lower voltage drives may result in incorrect braking thresholds. Always match the chopper model to the specific voltage rating and frame size of your inverter.