Automatic Voltage Regulator, Battery Charger

Major Components

3.3Automatic Voltage Regulator

The Automatic Voltage Regulator (AVR) protects connected equipment from power spikes, sags and other abnormalities by raising (boosting) or lowering (bucking) the output voltage as needed. This keeps the UPS output voltage within the connected equipment’s tolerance and accommodates wide mains voltage fluctuations without utilizing the batteries.

3.4Battery Charger

In Normal mode, the Battery Charger converts mains AC power into regulated DC power to float charge the battery. It is continuously charging the battery whenever the UPS is plugged into a power outlet and mains power is within acceptable limits - even if the UPS is turned Off.

3.5Battery

The PowerSure PSI utilizes valve-regulated, nonspillable, lead acid batteries. To maintain battery design life, operate the UPS in an ambient temperature of 20°C to 25°C (68°F to 77°F). Optional external battery cabinets are available to extend battery run times.

3.6Inverter—1000/1440 Models Only

In battery mode operation, the inverter utilizes the DC output of the battery and inverts it into pre- cise, regulated, sinewave AC power.

3.7DC-to-DC Converter—2200/3000 Models Only

The DC-to-DC Converter utilizes energy from the battery system and raises the DC voltage to the optimum operating voltage for the Bi-Directional Converter. This allows the Bi-Directional Converter to operate continuously at its optimum efficiency and voltage, thus increasing reliability.

3.8Bi-Directional Converter—2200/3000 Models Only

In normal operation, the Bi-Directional Converter changes mains AC power into regulated DC power to “float charge” the battery system. This converter is continuously charging the battery whenever the UPS is plugged into a power outlet and mains power is within acceptable limits—even if the UPS is turned Off. When mains power fails, the Bi-Directional Converter draws energy from the battery through the DC-to-DC Converter and inverts it into a regulated sinewave supplying power to con- nected equipment.

PSITM specifications

The Liebert PSITM is an advanced power protection system designed to ensure the reliability and efficiency of critical systems in data centers, industrial applications, and mission-critical environments. As the demand for uninterrupted power supply continues to grow, the Liebert PSI serves as an indispensable asset.

One of the main features of the Liebert PSI is its online double-conversion technology. This method guarantees a continuous supply of clean and stable power to connected loads by converting incoming AC power to DC, then back to AC. This process eliminates power disturbances such as voltage sags, surges, and harmonics, ensuring that sensitive equipment operates without interruption.

In addition to its robust power protection capabilities, the Liebert PSI offers scalable solutions to meet varying power requirements. Ranging from 5 kVA to 40 kVA, it can be configured for single or three-phase operation. This flexibility allows businesses to tailor the system to match their specific needs, whether they are expanding data center operations or simply upgrading existing infrastructure.

Another notable characteristic of the Liebert PSI is its energy efficiency. The unit is designed to operate with a high efficiency of up to 94%, which not only reduces operational costs but also minimizes the environmental impact. Moreover, it features an eco-mode that optimizes energy use during non-critical operations without sacrificing reliability.

The Liebert PSI is equipped with advanced communication and management capabilities. It includes an intuitive LCD display for real-time monitoring, enabling users to access vital information about the unit's performance and status. Additionally, it supports various communication protocols such as SNMP and Modbus, allowing for seamless integration into existing management systems.

Furthermore, the Liebert PSI is designed with an emphasis on modularity, allowing for easy upgrades and maintenance. This modular approach reduces downtime and enhances serviceability, ensuring that the system remains reliable throughout its lifecycle.

In summary, the Liebert PSITM stands out as a comprehensive power protection solution that combines cutting-edge technology, energy efficiency, and user-friendly features. Its commitment to safeguarding critical systems against power disturbances makes it a vital component in the infrastructure of any modern data center or industrial setting.