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ABB SS822 Power Voting Unit

1. Product Overview

2. Core Specifications

3. Key Functions

3.1 Redundant Power Monitoring & Voting

• Dual/Three-Channel Input Monitoring: Accepts power from 2 or 3 redundant SD822/SD823 modules. It continuously monitors input voltage (24V DC ±1%) and current of each power supply.
• "Voting" Logic Execution: Uses a "majority vote" principle to select the healthiest power source:
  • For 2-input config: If one power supply fails (e.g., overheats, outputs <22V DC), the SS822 switches to the other within ≤100ms (no voltage dip, so DCS operation continues).
  • For 3-input config: Selects the source with voltage closest to 24V DC; rejects sources with faults (e.g., overcurrent, undervoltage).
• Load Balancing: Prevents overloading of individual power supplies by distributing load evenly across healthy modules (e.g., 2× SD822s each supply 5A for a 10A total load).

3.2 Fault Detection & Alarm

• Real-Time Fault Identification: Detects power supply faults (undervoltage/overvoltage, overcurrent, overtemperature) and internal unit faults (e.g., voting logic error).
• Status Indicators:
  • Green LEDs (Input 1/2/3): Illuminates if the corresponding power supply is healthy.
  • Red "Fault" LED: Lights if ≥1 power supply fails or the SS822 has an internal error.
  • Yellow "Switching" LED: Flashes during power source 切换 (indicates normal transition, not a fault).
• Diagnostic Output: A dry contact (normally open) connects to AC 800M DI modules (e.g., DI810), triggering SCADA/HMI alarms (e.g., "SD822 #1 Fault – SS822 Switched to Input 2") for remote monitoring.

3.3 Seamless AC 800M Integration

• CEX Bus Communication: Transmits power supply status (voltage, current, fault codes) to the AC 800M controller via the CEX bus. This allows the DCS to log events (e.g., "2024-05-20 15:40: SS822 switched from Input 1 to 2") and enable predictive maintenance.
• Configuration via Control Builder M: Parameters (e.g., voltage thresholds for fault detection, voting mode) are set via ABB Control Builder M software—no on-site hardware adjustments needed, reducing human error.

4. Typical Applications

• Power Plant Boiler Control: Works with 2× SD822 modules to supply 24V DC to AC 800M controllers and AI830 I/O modules. If one SD822 fails, the SS822 switches instantly, preventing boiler control system shutdown.
• Petrochemical Reactor Safety Loops: Monitors 3× SD822s powering S100 I/O modules (for emergency shutdown valves). The "3-input voting" ensures only the most stable power source is used, avoiding false safety trips.
• Nuclear Auxiliary Systems: Ensures uninterrupted power to AC 800M-based monitoring systems (e.g., coolant level sensors). The ≤100ms switching time meets nuclear industry safety standards for power continuity.

5. Usage Notes

1. Power Supply Compatibility: Use only with ABB SD822/SD823 modules—third-party power supplies may not support voting logic or communication.
2. Wiring: Connect each redundant power supply to dedicated SS822 input terminals; use equal-length 2.5mm² copper cables (for 10A loads) to ensure balanced voltage detection.
3. Configuration: Set voltage fault thresholds (e.g., 22V DC for undervoltage, 26V DC for overvoltage) via Control Builder M—match to SD822/SD823 output specs to avoid false alarms.
4. Maintenance: Periodically test manual switchover (via Control Builder M) to verify voting logic works; replace the SS822 if the "Fault" LED stays lit after resolving power supply issues.
5. Redundancy Design: For 24/7 processes, use 2× SS822s in parallel (with separate power input groups) to avoid SS822 itself becoming a single point of failure

The structure and details of the product：

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