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Powerware 9335 Functional Description, Input Rectifier, Boost Converter, Inverter and Filter

Models: 9335

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5.3Functional Description

The UPS is an online double-conversion unit with a series power train. An uncontrolled rectifier feeds a boost converter, which in turn powers the inverter. The internal static bypass utilizes a static switch and an independent maintenance bypass switch is also included internal to the UPS cabinet. The unit input must be 4-wire in (plus ground) at the rectifier and 4-wire in (plus ground) at the bypass. The output can be either 4-wire plus ground or 3-wire plus ground depending on customer requirement. The unit does not incorporate any galvanic isolation, input to output. The battery string comprises 240 cells (480 volts nominal) arranged in a positive string of 120 cells and a negative string of 120 cells with the center of the series connected strings tied to system neutral, for the 80 kVA model. The 120 kVA model utilizes 144 cells on each side of the center connection (nominal 288 volts positive and negative, for 576 volts total). The battery is charged by positive and negative side chargers, which are powered from the output of the boost converter.

5.3.1 Input Rectifier

The Input Rectifier is a full wave bridge uncontrolled rectifier, which produces unregulated DC of approximately +390 and –390 volts DC. A pre-charge system charges the DC bus prior to the input contactor being closed, to control inrush current to no higher than rated current levels.

5.3.2 Boost Converter

A Boost Converter converts the raw DC input to a regulated DC link voltage of approximately +450 and –450 volts DC. It is operated in the current mode and is controlled using a variable modulation technique with a frequency in the range of

20 kHz. The neutral connection is maintained from the input to the output as a fixed connection.

5.3.3 Inverter and Filter

The inverter is a traditional (current mode controlled) hard-switched IGBT 3-phase topology. The IGBTs are modulated by a variable frequency, current-mode control technique at approximately 20 kHz. An output filter filters out the high frequency switching components (line to neutral).

5.3.4 Batteries and Battery Charger

The battery for the Powerware 80 kVA system is comprised of a positive string of 120 cells and a negative string of 120 cells, each made up of twenty 12-volt battery blocks. For the Powerware 120 kVA system, the battery strings are 144 cells positive and negative, respectively. The battery charger is divided into a positive side charger and a negative side charger, each powered from the respective positive and negative controlled DC bus voltages. The chargers operate automatically in the constant current

Powerware 9335 (80 kVA and120 kVA) Installation and Operation

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164201396 REV. A 071103

 

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Powerware 9335 operation manual Functional Description, Input Rectifier, Boost Converter, Inverter and Filter
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9335 specifications

The Powerware 9335 is a robust and efficient uninterruptible power supply (UPS) designed to deliver reliable power protection for critical applications. Expanding upon Eaton's tradition of offering advanced power management solutions, the Powerware 9335 is tailored for environments that demand high availability and uptime.

One of the standout features of the Powerware 9335 is its double-conversion online topology, which ensures a continuous supply of clean and regulated power. This design operates without any transfer time to battery power, effectively protecting sensitive equipment from all types of power disturbances, including surges, sags, and outages.

The UPS is available in a range of power ratings, from 8 kVA to 40 kVA, making it versatile enough to support a variety of applications ranging from small server rooms to larger data centers. The modular architecture of the Powerware 9335 allows for seamless scalability, enabling users to add additional capacity or redundancy as their power needs evolve. This feature is particularly beneficial in dynamic environments where equipment and loads can frequently change.

Another significant characteristic of the Powerware 9335 is its high efficiency, often exceeding 94% in normal operation. This efficiency not only reduces energy costs but also minimizes heat generation, leading to lower cooling requirements. The UPS employs advanced technologies such as Intelligent Power Management and Smart APM (Adaptive Power Management) to optimize power usage, further enhancing its overall performance and reducing the total cost of ownership.

The user-friendly LCD display furnishes real-time data regarding UPS status, battery condition, and power settings, facilitating proactive management and monitoring. In addition, the unit can be monitored and managed remotely, ensuring that administrators can access critical information even when they are not on-site.

The Powerware 9335 also comes equipped with various connectivity options, including USB, serial, and SNMP for seamless integration into existing IT infrastructure. Additionally, advanced communication capabilities allow for integration with building management systems, ensuring comprehensive power management and reporting.

Safety is paramount, and the Powerware 9335 incorporates numerous features designed to protect both the UPS and connected equipment. This includes overload protection, battery health monitoring, and environmental monitoring, which collectively contribute to a resilient power protection strategy.

In summary, the Powerware 9335 is an exceptional UPS offering from Eaton, featuring high availability, scalability, efficiency, and robust management options. With its advanced technologies and features, it stands out as a premier choice for organizations seeking to safeguard their critical systems and data.