ABB NBRA-654 brake chopper

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ABB NBRA-654 Brake Chopper

Introduction

The ABB NBRA-654 is a brake chopper unit used in ABB AC drive systems. It works together with external braking resistors to safely dissipate regenerative energy generated during motor deceleration or braking. By keeping the DC link voltage within a safe range, it protects both the drive and motor from overvoltage damage.

Technical Specifications

• Model: NBRA-654

• Type: Brake Chopper Unit

• Function: Dissipates regenerative braking energy into external resistors, prevents DC bus overvoltage

• Compatibility: ABB ACS series drives (e.g., ACS800, ACS880 models)

• DC Link Voltage Range: ~ 500 – 800 V DC (typical)

• Braking Power: Depends on load and resistor configuration (tens to hundreds of kW)

• Brake Resistor Connection: External braking resistor required

• Cooling: Air / forced air cooling (depending on setup)

• Mounting: Panel / cabinet installation, modular structure

• Standards: IEC/EN industrial safety and electrical standards

Features & Advantages

• Efficient energy dissipation during braking.

• Protects drive and motor from DC bus overvoltage.

• Modular integration with ABB drive systems.

• Designed for high-inertia loads and frequent braking operations.

• Durable and reliable for industrial environments.

Applications

• Cranes and hoists

• Elevators and escalators

• Winders and unwinders

• Conveyors

• Machine tools

• High-inertia industrial processes

Installation & Maintenance Notes

1. Always use a properly rated braking resistor to match system requirements.

2. Ensure adequate ventilation and cooling.

3. Verify that DC link voltage remains within specified limits.

4. Regularly check resistor condition and wiring connections.

5. Installation and commissioning should be performed by qualified personnel.

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