Understanding UPS Operation

If utility power is interrupted or falls outside the parameters specified in Chapter 15, “Product Specifications,” the UPS uses a backup battery supply to maintain power to the critical load for a specified period of time or until the utility power returns. For extended power outages, the UPS allows you to either transfer to an alternative power system (such as a generator) or shut down your critical load in an orderly manner.

The emergency bypass consists of a continuous-duty static switch and backfeed protection contactor K5. The backfeed protection contactor is located in series with the static switch. For manual transfers to bypass, the static switch is also used. The static switch is armed and ready during both types of transfers.

The operation of the UPS system is described in greater detail in the following paragraphs.

The UPS module may be configured for stand alone, single module, Reverse Transfer (RT) operation or multiple module, parallel redundant and/or parallel capacity operation (see paragraphs 7.2 and 7.3).

7.2 Single Module Reverse Transfer (RT)

A single module operates independently to support an applied load from the inverter, providing conditioned and uninterruptible AC power to the critical load from the output of the module. During an outage, the inverter continues to operate, supporting power to the load from the battery supply. If the unit requires service, applied loads are transferred to the internal bypass, continuous-duty static switch either automatically or manually. With the exception of a battery cabinet, no other cabinets or equipment are required for the single module to successfully support its applied loads.

7.2.1 Single Module RT Modes

The Powerware 9390 UPS supports a critical load in three different modes of operation. The UPS can automatically use all three modes, as required. The standard operation modes are:

￿In Normal mode, the critical load is supplied by the inverter, which derives its power from rectified utility AC power. In this mode, the battery charger also provides charging current for the battery, if needed.

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

￿In Bypass mode, the critical load is directly supported by utility power.

7-2

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

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Powerware 9390 operation manual Single Module Reverse Transfer RT, Single Module RT 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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