Understanding UPS Operation

7.2.4 Battery Mode – RT

The UPS automatically transfers to Battery mode if a utility power outage occurs, or if the utility power does not conform to specified parameters. In Battery mode, the battery provides emergency DC power that the inverter converts to AC power.

Figure 7-4 shows the path of electrical power through the UPS system when operating in Battery mode.

K5

Static

Switch

Rectifier

 

K1

 

 

Battery

 

Converter

Breakers Contactors

 

Closed

CB2

 

Open

 

Battery

Inverter

K3

Main Power Flow

Trickle Current

Energized

De-Energized

Figure 7-4. Path of Current Through the UPS in Battery Mode – RT

During a utility power failure, the rectifier no longer has an AC utility source from which to supply the DC output current required to support the inverter. The input contactor K1 opens and the battery instantaneously supplies energy the battery converter. The converter either bucks or boosts the voltage so that the inverter can support the customer’s load without interruption. If bypass is common with the rectifier input, the feed back protection contactor K5 also opens. The opening of contactors K1 and K5 prevent system voltages from bleeding backwards through the static switch and rectifier snubber components and re-entering the input source.

While in Battery mode, the UPS sounds an audible horn, illuminates a visual indicator lamp on the front panel (System Normal, On Battery), and creates an entry into the alarm event history. As the battery discharges, the converter and inverter constantly make minute adjustments to maintain a steady output. The UPS remains in this operating mode until the input power to the rectifier is again within the specified voltage or frequency acceptance windows.

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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 Path of Current Through the UPS in Battery Mode RT

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.