Understanding UPS Operation

If the input power fails to return or is not within the acceptance windows required for normal operation, the battery continues discharging until a DC voltage level is reached where the inverter output can no longer support the shared loads. When this event occurs on each UPM, UPMs that are about to be shut down issue another set of audible and visual alarms that indicate a two-minute SHUTDOWN IMMINENT warning. Unless the system has a valid AC input soon, redundant UPMs begin shutting down until there are no longer enough UPMs online to support the connected load. When this event occurs, the system shuts down. If the bypass source is available, the system transfers to bypass instead of shuting down.

If at any time during the battery discharge the input power becomes available again, the rectifier begins to supply DC current to the inverter. At this point, the unit returns to Normal mode. If at any time during the battery discharge the AC input power becomes available again, each rectifier turns on, assumes the inverter load from the batteries, and begins recharging the batteries. Depending on the total load and the duration of the battery discharge, battery and rectifier input current limit alarms may be seen for a short time due to the current required to recharge the batteries.

7.4 Functional Description

The UPS is a true online double-conversion unit with a transformerless power train. A high-frequency active rectifier powers a high-frequency three-phase inverter. The bypass circuit uses a solid-state continuous-duty static switch. The UPS operates from battery strings from 192 cells (384V) to 240 cells (480V).

7.4.1 Input Rectifier

The rectifier is a three-phase, high-frequency PWM, IGBT-based power conversion stage that provides input power factor correction and low input current harmonic distortion. The rectifier maintains a DC level that is optimized for maximum inverter efficiency. A precharge system charges the energy storage elements in the power train prior to energizing the rectifier.

7.4.2 Inverter

The inverter is a three-phase, high-frequency PWM, IGBT-based power conversion stage that continuously supplies the critical load with high-quality AC power. The IGBTs are modulated to maintain the highest efficiency.

7.4.3 Battery Charger and Advanced Battery Management

The charger is a high-frequency, IGBT-based power conversion stage. The UPS uses Advanced Battery Management (ABM) technology, which essentially isolates the battery from the electrical environment, except for periodic charging or reserve mode operation, extending its life.

ABM extends battery life by keeping the batteries charged and performing periodic battery testing.

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

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Powerware 9390 Functional Description, Input Rectifier, Inverter, Battery Charger and Advanced Battery Management
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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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