Description
ABB SS822 3BSC610042R1
I. Overview
ABB SS822 3BSC610042R1 is a dual redundant power voting unit, with its core positioning as a redundant power switching and uninterrupted supply unit for critical industrial scenarios. It belongs to ABB's industrial automation power product series and is specially designed for fields with extreme requirements for power supply reliability, such as nuclear power, wind power and chemical engineering. With two-channel 24V DC power supplies as input, this unit achieves real-time monitoring, fast switching and stable output through a built-in intelligent voting mechanism. It can switch to the backup power supply within milliseconds when a single-channel power supply is abnormal, and supports hot swapping and parallel expansion at the same time. It provides uninterrupted power supply guarantee for downstream key equipment such as PLC, DCS controllers and Emergency Shutdown (ESD) systems, serving as a core power supply component to ensure the continuous operation of industrial control systems and avoid unplanned downtime losses.
II. Core Features
High-speed Dual Redundant Voting Switching: Supports two-channel 24V DC input and single-channel stable output, with a built-in intelligent voting circuit that monitors the voltage and current stability of the two power supplies in real time. When the main power supply experiences undervoltage, power failure or faults, the switching time is less than 10ms, and there is no voltage fluctuation during the switching process. This ensures that downstream equipment experiences no perceptible power interruption, fully meeting the uninterrupted power supply requirements of critical systems.
Strong Anti-interference and Voltage Stability: Adopts common-mode inductor filtering technology, which can effectively suppress high-frequency noise and electromagnetic interference on power lines. The output voltage fluctuation is less than 0.5% in an interference environment of 30V/μs, complying with the IEC 61000-4-6 electromagnetic compatibility standard. It can resist interference from frequency converters, high-voltage equipment and other devices in industrial sites, ensuring accurate and stable output voltage.
Flexible Expansion and Hot-swappable Design: Supports modular parallel expansion; a single module can be stacked to achieve 4-channel redundant configuration, adapting to the N+2 redundancy requirements of large-scale control systems. It supports hot swapping operation, allowing maintenance and replacement without interrupting the overall power supply. This greatly improves the convenience and availability of system operation and maintenance, and reduces maintenance downtime costs.
- Wide Environmental Adaptability and High Reliability: The operating temperature range covers -40℃ to +70℃, capable of withstanding extreme high and low temperature working conditions, and adapting to complex environments such as offshore salt spray and inland drought. Encapsulated with industrial-grade components, it has a net weight of 0.8kg and a robust and durable structure. Field tests have shown that it can significantly reduce the annual equipment failure rate in wind power and nuclear power scenarios.
III. Technical Parameters
| Parameter Name | Specification |
|---|---|
| Product Model | ABB SS822 3BSC610042R1 |
| Product Type | Dual Redundant Power Voting Unit (modular design) |
| Input Parameters | Two-channel 24V DC input, maximum input current 10A per channel, supporting redundant power supply |
| Output Parameters | Single-channel 24V DC output, maximum output current 20A, switching time ＜10ms, voltage fluctuation ＜0.5% |
| Environmental Adaptability | Operating temperature -40℃~+70℃, storage temperature -40℃~+85℃; relative humidity 5%~95% (non-condensing) |
| Installation & Expansion | Modular on-site installation, supporting TS35 DIN rail mounting; parallel expandable to 4-channel redundancy, supporting hot swapping |
| Product Weight | Net weight approx. 0.8kg |
IV. Working Principle
ABB SS822 3BSC610042R1 power voting unit realizes reliable supply of redundant power based on a closed-loop working process of dual-channel synchronous monitoring - intelligent voting judgment - high-speed disturbance-free switching - fault feedback and alarm. The specific working process is divided into four core stages:
Through built-in high-precision voltage and current detection circuits, the unit simultaneously monitors the operating status of the two 24V DC input power supplies, including voltage value, current stability and line connectivity. It filters high-frequency noise and interference signals synchronously, and transmits accurate monitoring data to the internal intelligent voting module, providing a reliable basis for subsequent judgments.
Based on preset standards such as voltage thresholds and current ranges, the voting module conducts real-time evaluation of the status of the two power supplies. Under normal working conditions, it prioritizes the main power supply as the output source while keeping the backup power supply in standby mode, ensuring clear power supply priority. When abnormalities such as undervoltage, power failure or short circuit are detected in the main power supply, it immediately triggers a voting switching command to avoid power supply interruption caused by decision-making delays.
Upon receiving the switching command, the built-in switching circuit of the unit completes the output path switching within less than 10ms, seamlessly switching from the main power supply to the backup power supply. During the switching process, the filtering and voltage stabilizing circuits maintain stable output voltage with a fluctuation range of less than 0.5%, ensuring that downstream equipment such as DCS and ESD can operate continuously without impact. At the same time, it monitors the load status of the output terminal in real time and triggers overload and short-circuit protection mechanisms to ensure the safety of the unit and downstream equipment.
