ABB NBRA-669C universal brake chopper

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1. Product Overview

The ABB NBRA-669C is a universal brake chopper used in DC motors and variable frequency drive (VFD) systems. It safely dissipates excess energy generated during motor braking or regenerative operation into an external resistor, protecting the inverter and motor system. NBRA-669C features high reliability, fast response, and excellent heat dissipation, suitable for industrial automation and electromechanical drive applications.

2. Technical Specifications

• Model: NBRA-669C

• Type: Universal Brake Chopper

• Rated Voltage: DC 690 V

• Rated Current: 50 A

• Overvoltage Trigger: Typically DC 720 V ±5% (adjustable)

• Power Dissipation: ~30 kW (depends on resistor and duty cycle)

• Brake Resistor Connection: External brake resistor

• Response Time: < 1 ms

• Cooling: Natural convection or forced air (depending on application)

• Mounting: Panel or cabinet mount

• Operating Temperature: -20°C to +50°C

• Storage Temperature: -40°C to +70°C

• Protection Class: IP20

• Standards: IEC 60146 / CE industrial standards

• Diagnostics: LED indicators for operation and fault

3. Advantages & Features

1. Safe protection

   • Quickly dissipates excess energy during braking to protect inverter and motor.

2. Fast response

   • Trigger time <1 ms for rapid overvoltage handling.

3. High versatility

   • Compatible with various DC motor drives and VFDs.

4. High reliability

   • Industrial-grade design with strong overload tolerance for various working conditions.

5. Easy installation and maintenance

   • Panel or cabinet mount, modular design for easy replacement and service.

6. Status monitoring

   • LED indicators display operating status and fault for maintenance and diagnostics.

4. Application Areas

• DC motor drive braking protection

• AC inverter regenerative braking

• Elevators, cranes, and conveyor control systems

• Industrial automation production lines and machinery

• Heavy industry drives: steel, mining, pulp & paper

5. Precautions & Recommendations

1. Voltage matching

   • Ensure chopper rated voltage matches system DC bus voltage to avoid malfunction or damage.

2. Brake resistor selection

   • External resistor power rating and resistance must meet specifications to safely dissipate energy.

3. Environmental conditions

   • Install in a dry, ventilated, non-corrosive cabinet.

4. Cooling requirements

   • Avoid high temperature; use forced cooling or heatsinks if necessary.

5. Regular inspection

   • Check LED status, wiring tightness, and resistor temperature to ensure reliable operation.

6. Safe operation

   • Disconnect power before maintenance to prevent electric shock or equipment damage.

The structure and details of the product：

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