Ensuring Uptime with Redundant Power

In industrial automation, power supply failures can halt production and lead to costly downtime. The ABB SS822 Power Voting Unit addresses this challenge by providing a reliable solution for redundant power architectures. For maintenance engineers, this unit simplifies the task of ensuring continuous operation in critical control systems.

Introducing the SS822 Power Voting Unit

The SS822 is a voting unit from ABB, designed to manage dual power inputs and deliver a single, stable output. It accepts two 24V DC inputs, each rated at 20A, and provides a single 24V DC output at 20A. This configuration allows the unit to select the active power source automatically, ensuring uninterrupted power to connected loads.

Each power input on the SS822 is supervised, meaning the unit monitors the health of both supplies. If one input fails, the unit seamlessly switches to the other, maintaining output without interruption. This feature is critical for applications where power continuity is non-negotiable, such as in process control or safety systems.

Technical Specifications and Performance

The SS822 operates with an input voltage of 24V DC and a maximum input current of 10A per channel. Its output voltage is also 24V DC, with a maximum output current of 20A. The unit is mounted on a DIN rail, making it easy to install in standard industrial enclosures. With a net weight of 0.5 kg and a width of 50 mm, it occupies minimal space in a cabinet.

This voting unit is specifically designed for use with ABB power supplies such as the SD821, SD822, and SD823. Its compact form factor and straightforward wiring reduce installation time and simplify maintenance. For engineers, the supervised inputs provide clear status indication, aiding in quick troubleshooting.

Applications in Modern Manufacturing

The SS822 is ideal for applications requiring high availability, such as programmable logic controller (PLC) racks, distributed control systems, and safety instrumented systems. In a typical scenario, a plant might use two separate power supplies feeding into the SS822. If one supply fails, the unit automatically switches to the backup, preventing a system shutdown.

Another common use is in remote terminal units (RTUs) or field instrumentation where power redundancy is essential. The SS822 ensures that critical field devices remain powered even during a primary supply fault. This capability reduces the risk of data loss or process interruptions.

Customer Case Scenario

Consider a chemical processing plant that relies on a redundant power architecture for its safety system. By integrating the SS822 with two ABB power supplies, the plant achieves automatic failover without manual intervention. This setup minimizes downtime and simplifies maintenance, as engineers can replace a faulty power supply without disrupting operations.

Frequently Asked Questions About the SS822

What is the primary function of the ABB SS822?

The SS822 is a power voting unit that accepts dual 24V DC inputs and provides a single 24V DC output. It automatically selects the active input to ensure continuous power delivery, making it ideal for redundant power supply configurations.

What are the key specifications of the SS822?

The SS822 has dual 24V DC inputs with a maximum current of 20A each, and a single 24V DC output rated at 20A. It is DIN rail mounted, weighs 0.5 kg, and has a width of 50 mm. Each input is supervised for fault detection.

Which power supplies are compatible with the SS822?

The SS822 is designed for use with ABB power supply models SD821, SD822, and SD823. For other compatibility details, please refer to official ABB documentation or contact PetroPartsOnline.

Conclusion

The ABB SS822 Power Voting Unit offers a straightforward solution for achieving power redundancy in industrial systems. Its supervised inputs, compact design, and ease of installation make it a valuable component for maintenance engineers focused on system reliability. For more information or to place an order, visit PetroPartsOnline.