Справочник Пользователя для Liebert 700VA

In normal operation, the Liebert GXT3’s rectifier/power factor correction (PFC) circuit converts mains 

power to regulated DC power for use by the inverter while ensuring that the wave shape of the input 

current used by the UPS is near ideal. Extracting this sine wave input current achieves two 

objectives:

• Efficient power use by the UPS
• Reduced reflected harmonics

This results in cleaner power being available to other devices in the building that are not protected by 

the UPS.

In normal operation, the Liebert GXT3’s inverter utilizes the DC output of the PFC circuit to produce 

precise, regulated sine wave AC power. When mains power fails, the inverter receives DC power from 

the battery through the DC-to DC converter. In either operation mode, the UPS inverter is online, 

continuously generating clean, precise, regulated AC output power.

The battery charger utilizes energy from the mains power and precisely regulates it to continuously 

float charge the batteries. The batteries are being charged whenever the Liebert GXT3 is plugged in, 

even when the UPS is not turned On.

The DC-to-DC converter raises the DC voltage from the battery to the optimum operating voltage for 

the inverter. This allows the inverter to operate continuously at its optimum efficiency and voltage, 

increasing reliability.

The Liebert GXT3 utilizes valve-regulated, nonspillable, lead acid batteries. To maintain battery 

design life, operate the Liebert GXT3 in an ambient temperature of 0°C to 25°C (32°F to 77°F).
Optional external battery cabinets are available to extend battery run times.

The Liebert GXT3 provides an alternate path for mains power to the connected loads in the unlikely 

event of a UPS malfunction. Should the Liebert GXT3 have an overload, overtemperature, or UPS 

failure condition, the UPS automatically transfers the connected loads to bypass. 

The UPS operation modes include the following: Mains (AC) Mode, Bypass Mode, Battery Mode, 

Battery Recharge Mode and Frequency Converter Mode.
For the descriptions of operation mode indicators and control buttons, refer to 3.0 - Operation and 

During Mains (AC) Mode, the mains provides energy to the Liebert GXT3. The filters, PFC circuit and 

inverter process this power to provide high-level power to connected loads. Meanwhile, the UPS 

maintains the batteries in a fully charged state.

NOTE
The bypass power path does not protect the connected loads from disturbances on the mains.