Understanding UPS Operation

Up to four units can be paralleled for redundancy or capacity without any additional cabinets.

The system is paralleled for redundancy (1 + 1) in a system where two UPMs are paralleled together and the load is less than the supporting capability of one of the UPMs. The system is paralleled for capacity (2 + 0) if both UPMs in a system are required to support the load.

A parallel capacity system can also be redundant (2 + 1), as long as there is always one or more UPMs online than required to support the load.

7.3.1 Multiple Module Parallel System Modes

Similar to the single module system, the Powerware 9390 UPS parallel system supports a critical load in three different modes of operation. The standard operation modes are:

￿In Normal mode, the paralleled UPMs supply the critical load with clean, filtered power. Each UPM battery charger also provides charging current for the battery if needed.

￿In Battery mode, the battery provides DC power, which maintains UPM operation. The UPM batteries supports the critical load.

￿In Bypass mode, the critical load is directly supported by utility power through the continuous-duty static bypass switch in each UPM.

The UPMs continually monitor themselves and the incoming utility power, and automatically switch between these modes as required, without operator intervention, except when manually switching to Bypass mode. The sophisticated detection and switching logic inside the UPMs ensures that operating mode changes are automatic and transparent to the critical load, while internal monitoring systems indicate the current mode of operation. The UPMs switch operating modes in response to these system events:

￿A command is an intervention that is externally initiated by an operator or by some site action. A command causes the UPMs to switch operating modes; it usually does not require any further.

￿A notice is a minor system event that may or may not require attention.

￿An alarm is a system event that requires immediate intervention.

System events, alarm horns, and indicator lights are described in Chapter 12, “Responding to System Events.”

To assist in developing an understanding of the parallel systems modes of operation, review and understand thoroughly the single module modes of operation

The following paragraphs describe the differences in the three parallel system operating modes, using block diagrams to show the power flow during each mode of operation.

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Powerware® 9390 UPS (40–80 kVA) Installation and Operation Manual S 164201535 Rev C

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Powerware 9390 operation manual Multiple Module Parallel System Modes
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9390 specifications

The Powerware 9390 is a high-performance uninterruptible power supply (UPS) designed for critical applications in data centers, telecommunications, and other industries requiring maximum uptime. This UPS system is renowned for its durability, efficiency, and advanced technological features, making it an ideal choice for environment-sensitive operations.

One of the standout characteristics of the Powerware 9390 is its modular architecture. This design allows for scalability, enabling businesses to tailor the power supply to fit their specific needs. Users can add or remove power modules as demand fluctuates, ensuring optimal performance without overspending on unnecessary capacity. The system is available in various power ratings, typically ranging from 40 kVA to 750 kVA.

Among the key technologies utilized in the Powerware 9390 is the Advanced Battery Management (ABM) system. This innovative feature helps extend battery life by monitoring and optimizing charging cycles. The ABM technology uses an intelligent three-stage charging process, significantly reducing battery wear while ensuring high availability of power during outages. This enhancement not only improves reliability but also lowers maintenance costs over time.

Energy efficiency is another hallmark of the Powerware 9390, as it incorporates double-conversion technology to maintain voltage stability. This ensures that sensitive electronic equipment is protected from surges and fluctuations in power supply. Additionally, the UPS offers high input power factor and low harmonic distortion, contributing to overall energy savings while minimizing the environmental impact.

The Powerware 9390 is equipped with advanced monitoring and management features that allow users to maintain complete control over their power infrastructure. An intuitive LCD display provides real-time metrics on system performance, battery status, and operational logs. Furthermore, the UPS can be integrated with network management systems, enabling remote monitoring and management via web interfaces.

In terms of safety characteristics, the Powerware 9390 adheres to rigorous industry standards, ensuring that it provides reliable performance under various operating conditions. Its robust construction and redundant components further enhance reliability, making it a popular choice in mission-critical environments.

In conclusion, the Powerware 9390 stands out as a leader in the UPS market, combining modular scalability, advanced battery management, energy efficiency, and robust safety features. Its ability to adapt to the needs of dynamic organizations while providing reliable power protection makes it an invaluable asset for any critical application. With its state-of-the-art technologies, businesses can depend on the Powerware 9390 for continuity, efficiency, and peace of mind.
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