The ABB SB821 (Part Number: 3BSE018109R1) is a compact, high-reliability battery backup unit designed for use with ABB’s AC 800M controller family, primarily within the ABB 800xA distributed control system (DCS). The unit ensures uninterrupted operation of the controller’s internal clock and real-time applications in the event of power loss, maintaining data integrity and time-based synchronization within the system.

Typically integrated into automation cabinets, the SB821 provides essential short-term power support to maintain memory and real-time operations during temporary power outages or when switching power sources. Its integration into ABB’s automation platform underlines its importance in maintaining system uptime, particularly in mission-critical industrial environments.

Product Specifications

Applications

The SB821 battery unit is an essential component in ABB’s automation ecosystem, providing memory and timekeeping continuity in industrial settings. It is widely applied in:

• Power Plants: Ensuring uninterrupted timekeeping in turbine and generator control systems.

• Petrochemical Facilities: Preserving controller states and time-critical data during power transitions.

• Manufacturing Plants: Avoiding production interruptions by maintaining control data during outages.

• Water Treatment Plants: Supporting real-time clock in process automation systems.

• Substations and Utility Grids: Enhancing operational resilience of SCADA and DCS controllers.

• Pharmaceutical and Food Processing: Ensuring compliance and data retention in regulated environments.

Product Advantages

• Long-Life Battery: Designed with lithium-ion technology, offering 5–10 years of operational lifespan.

• Controller Compatibility: Seamless integration with the AC 800M controller series, enabling plug-and-play configuration.

• Compact and Lightweight: Easy installation even in dense control cabinets, minimizing space consumption.

• Data Retention: Maintains controller memory and time clock during power interruptions.

• Maintenance-Free: No charging or special servicing required, contributing to lower lifecycle costs.

• Industrial Reliability: Operates effectively across a wide range of temperatures and humidity levels.

• CE and RoHS Certified: Environmentally responsible and compliant with global safety standards.

• Plug-and-Play Installation: Reduces engineering effort and minimizes system downtime during integration.

Frequently Asked Questions (FAQ)

1. What is the main function of the ABB SB821 battery unit?

It provides backup power to maintain the internal memory and clock of AC 800M controllers during a power outage.

2. How long does the battery typically last?

The SB821 has a life expectancy of 5–10 years under normal conditions.

3. Is the SB821 rechargeable?

No, it is a non-rechargeable lithium-ion battery unit.

4. Which ABB controllers are compatible with the SB821?

It is compatible with PM861, PM864, PM865, PM866, and similar AC 800M series controllers.

5. How do I install the SB821 battery unit?

It is installed directly within the controller housing or mounted on DIN rails inside the cabinet.

6. Does the SB821 require any maintenance?

No, it is a maintenance-free unit designed for long-term use without servicing.

7. What happens when the battery is depleted?

The controller may lose time synchronization and memory retention during outages; battery replacement is recommended upon warning.

8. How will I know the battery needs replacement?

The system will typically generate a diagnostic alarm indicating low battery voltage.

9. Can the battery be replaced while the system is running?

For safety and data integrity, it is recommended to replace the battery during planned system shutdowns.

10. What certifications does the SB821 have?

It complies with CE, RoHS, and WEEE standards for industrial safety and environmental responsibility.