Liebert PSITM Automatic Voltage Regulator, Battery Charger, Inverter-1000/1440 Models Only

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.

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