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Dual-system redundant UPS power supply

Fiber and communications infrastructure knowledge brief Published 16 Mar 2023

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A dual-system redundant UPS setup ensures continuous power to critical loads by using two independent or parallel UPS units, providing high reliability, fault tolerance, and maintenance flexibility.

Overview of Dual-

System Redundancy

A dual-system redundant UPS configuration involves two UPS units supplying power to the same critical load. This design ensures that if one UPS fails, the other can continue to supply full power without interruption, maintaining uptime for sensitive equipment such as servers, PLCs, or DCS systems. Redundancy can be implemented in several ways: Split Operation: Each UPS operates independently, supplying separate loads or dual-input devices.

This provides true redundancy, fault isolation, and simplified maintenance, as one UPS can be taken offline without affecting the other. Parallel Operation: Both UPS units are electrically connected to share the same load. This allows for N+1 redundancy, where one UPS can fail while the other supports the full load, and also increases total capacity.

However, it requires careful synchronization and matching of UPS models to avoid circulating currents or control issues. Redundancy LevelsN+1 Configuration: One extra UPS module is added beyond the required capacity. If a single UPS fails, the remaining units continue to support the load.

2N Configuration: Two independent UPS systems supply separate power paths (A-side and B-side) to the critical load. Failure of one system does not affect the other, providing maximum reliability.

Operational Benefits

Continuous Power Supply: If one UPS or its battery fails, the other UPS maintains full power to the load. Maintenance Flexibility: One UPS can be serviced or replaced without impacting the critical load. Fault Tolerance: Parallel systems can switch to bypass or alternate power sources if both inverters fail, ensuring uninterrupted operation.

Software Integration: Networked UPS units can communicate with servers to manage graceful shutdowns only when both UPS units are depleted, preventing unnecessary downtime.

Considerations for Implementation

Compatibility: Parallel operation requires UPS units of the same model and manufacturer to ensure proper synchronization. Instrumentation Systems: For sensitive industrial equipment, split operation is often preferred due to higher reliability and reduced risk of cascading failures. Monitoring and Management: UPS network management cards and software like PowerChute Network Shutdown allow configuration of shutdown triggers and monitoring of battery health.

Conclusion

A dual-system redundant UPS provides robust protection against power interruptions, offering both operational continuity and flexibility for maintenance. Choosing between split or parallel operation, and selecting the appropriate redundancy level (N+1 or 2N), depends on the criticality of the load, system complexity, and the need for fault isolation or load sharing. Proper configuration and monitoring ensure maximum uptime and reliability for critical IT or industrial systems.

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Dual-system redundant UPS power supply

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This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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