5.2.3 Battery Mode

The UPS transfers to battery mode automatically 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 5–4 shows the path of electrical power through the UPS system when operating in Battery mode.

Battery Mode

 

 

 

 

IA1

 

 

K4

 

Static Switch

K1

Input Filter

Rectifier

Booster

 

F1

 

 

 

Breaker

Contactors

Switches

 

 

Closed

 

 

 

 

Open

 

 

 

Battery

 

 

 

 

 

 

 

 

Breaker

 

 

 

 

Battery

Inverter

K2

 

Battery

Charger

Main Power

Trickle Current

Energized

De-Energized

IA2

Figure 5–4. Path of Current Through the UPS in Battery Mode

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 battery charger and boost converter. The input contactor (K1) is opened, the battery charger is turned off, and the battery SCRs (+ and -) both receive signals to turn on to provide battery power to the system. Because the battery SCRs are electronic devices, battery power is instantly available to the boost converter so that the inverter and customers load can be supported without interruption. In a single feed installation, where the bypass input is connected to the rectifier input, the back feed protection contactor (K4) will also open. The opening of contactors K1 and K4 prevents static system voltage from bleeding backwards through the static switch and rectifier snubber components and re-energizing the input source.

5-8

Powerware 9335 (80 kVA and 120 kVA) Installation and Operation

 

164201396 REV A 071103

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Powerware 9335 operation manual Battery Mode

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.