ABB NBRA-659C braking chopper

The ABB NBRA-659C is a braking chopper used in conjunction with variable frequency drives (VFDs) to dissipate excess energy generated during motor deceleration, preventing overvoltage in the DC bus of the drive system.

Key Specifications:

• Manufacturer: ABB
• Part Number: NBRA-659C
• Category: Braking Chopper
• Type: DC Bus Braking
• Rated Voltage: 525-690 V AC
• Chopper Type: External braking chopper
• Max Continuous Power Dissipation: Based on drive size and application
• Brake Resistor Compatibility: Used with external brake resistors (sized according to application)
• Switching Frequency: High-speed switching to ensure effective braking
• Protection: Over-temperature and overcurrent protection
• Cooling Method: Forced air cooling or natural convection, depending on installation
• Mounting: Panel mounting (DIN rail may be available for certain configurations)
• Dimensions: Standard size for braking choppers, varies based on power requirements
• Weight: Varies based on configuration, typically between 1-5 kg

Environmental Specifications:

• Operating Temperature: 0°C to +40°C
• Storage Temperature: -25°C to +70°C
• Humidity: 5% to 95%, non-condensing
• Altitude: Up to 1000 meters (derating required for higher altitudes)

Functionality:

The ABB NBRA-659C Braking Chopper works by engaging when the DC bus voltage exceeds a predefined threshold. It directs the excess energy to the external brake resistor, converting the electrical energy into heat, ensuring that the drive and motor system remain within safe operational parameters.

This braking chopper is crucial for applications requiring fast or frequent deceleration, such as cranes, elevators, and high-inertia loads.