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Phone: +86 16626708626Description
3. Key Technical Specifications
- Voltage Rating: 600V class (suitable for nominal drive voltages around 500-600V)
- Function: Switches braking resistor to dissipate excess DC bus energy
- Installation: External to drive module
- Control: Fiber optic link to drive
- Power Connections: Heavy-duty terminals for DC bus and resistor
- Cooling: Integrated cooling (fan on some configurations)
- Protection: Over-temperature and fault monitoring
- Dimensions: Compact external package (approx. 200 x 162 x 151 mm)
- Weight: Approx. 2.8 kg
- Enclosure: IP20 or suitable for cabinet installation
4. Product Introduction
The ABB NBRA-663 is an external braking chopper for ACS800 and compatible drive systems. It connects to the DC bus and activates to route regenerative energy into an external braking resistor during deceleration or overhauling loads.
This unit is field-proven in applications with high inertia loads such as cranes, conveyors, and centrifuges where internal chopper capacity is insufficient. It provides reliable braking without tripping the drive on overvoltage.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Drive overvoltage fault during braking | Chopper not activating | ✅ High | Check fiber optic connection and enable signal | Verify wiring and drive parameters for brake chopper |
| Chopper overheating | Insufficient resistor size or duty cycle exceeded | ✅ High | Monitor temperature and braking frequency | Calculate required resistor value and duty for application |
| No braking response | Fiber optic link failure | ✅ High | Inspect fiber cables for damage and proper connection | Replace fiber if bent or dirty; test continuity |
| Resistor not heating during expected braking | DC bus voltage below activation threshold | ✅ Medium | Measure DC bus voltage with multimeter | Confirm voltage selection jumper settings match supply |
| Chopper fault indication | Internal over-temp or power issue | ✅ High | Check status LEDs and drive diagnostics | Allow cooling and inspect connections |
Always verify resistor sizing matches your duty cycle and inertia calculations. Provide drive fault logs and wiring photos when contacting support.
- NBRA-663
- NBRA-663
6. Frequently Asked Questions (FAQ)
What drives is the NBRA-663 compatible with? Primarily ACS800 series and similar ABB drives requiring external braking capacity in the 600V class.
Do I need a separate braking resistor? Yes. The NBRA-663 switches current to an external resistor. Select resistor ohms and power rating based on your specific load and duty cycle.
How is the chopper controlled? Via fiber optic link from the drive. The drive enables and modulates the chopper based on DC bus voltage.
Is this unit new or refurbished? Offered as New Original / New Surplus. Units are tested for proper switching and thermal operation before shipping.
Can it be mounted inside the drive cabinet? Yes, typically installed in the same cabinet with adequate ventilation and clearance for heat dissipation.
What voltage selection is required? Factory or field-set via jumper for the correct DC bus threshold (e.g., around 795-811V for 500V nominal systems). Confirm setting matches your drive supply voltage.
Warranty and availability? 1-year warranty on functional units. Stock is verified and ready for prompt shipment. Contact us for resistor pairing recommendations.
