ABB SS822 Power Voting Unit

The ABB SS822 is a high-reliability power voting unit engineered to ensure uninterrupted power supply in critical industrial automation systems. As part of ABB’s S800 I/O platform, the SS822 manages dual 24V DC power inputs, providing seamless redundancy for PLCs, I/O modules, and field devices. Its rugged design and fast failover make it ideal for industries where downtime is costly, such as oil and gas, power generation, and water treatment.

The SS822 acts as a redundant power hub, continuously monitoring two independent 24V DC sources. If one fails, it switches to the backup within 50 milliseconds, ensuring zero interruptions to connected systems. With a 20A output capacity and compact DIN rail design, the module supports space-constrained installations while delivering 95% energy efficiency and industrial-grade durability (-25°C to +70°C operation).

Technical Specifications

Key Advantages

• Zero-Downtime Redundancy: The SS822’s millisecond-level failover reduces downtime risks by 90% in safety-critical applications like offshore drilling, where power outages could halt production worth $500,000/hour.
• Energy Efficiency: 95% efficiency cuts annual energy costs by $1,200+ compared to legacy 85% efficient units in 24/7 operations.
• Space-Saving Design: At 50mm width, it occupies 30% less cabinet space than comparable dual-input modules, ideal for retrofitting older systems.
• Rugged Reliability: Withstand 5g vibrations and 50g shocks (IEC 60068), the SS822 outlasts generic units in harsh environments like wastewater treatment plants.

Applications & Case Studies

• Oil & Gas: Powers emergency shutdown systems on offshore platforms, ensuring safety during storms.
• Power Generation: Redundant power for turbine control systems in coal-fired plants, maintaining grid stability during voltage sags.
• Water Treatment: Supports pumps and sensors in sewage treatment, preventing regulatory fines during power fluctuations.

Case Study: A German chemical plant reduced unplanned outages by 85% using SS822 units for reactor controls. The module’s automatic failover saved €200,000 annually in production losses.

Competitor Comparison

• Redundancy Speed: <50ms switching vs. 100–200ms in comparable modules, critical for time-sensitive processes.
• Current Capacity: 20A continuous vs. 15A in competing products，supporting more devices per unit.
• Temperature Range: -25°C to +70°C vs. -20°C to +60°C, suitable for Arctic and desert deployments.

Selection Recommendations

• Redundancy Level: Choose SS822 for N+1 redundancy (e.g., SIL 2/3 systems); use single-input SD831 for non-critical loads.
• Compatibility: Pair with ABB’s S800 I/O modules (e.g., DI810, AO810) for plug-and-play integration.
• Future Scalability: Opt for SS822-20A (vs. 10A variants) to accommodate expanding I/O needs without replacement.

Installation & Maintenance Notes

• Wiring: Use 2.5mm² cables for inputs/outputs to prevent voltage drops; torque terminals to 0.7N·m.
• Grounding: Connect to system ground via dedicated terminal to reduce EMI noise.
• Maintenance: Inspect LED status monthly; replace after 100,000 hours (11 years at 8,760h/year).
• Firmware: Update via ABB’s Automation Builder to enable advanced diagnostics (e.g., predictive failure alerts).