4 Chapter 1 Product Introduction
Liebert
®
ITA 10kVA UPS User Manual
～
－
－
～
－
－
Bypass input
Mains input
Output
～
－
－
～
－
－
Bypass input
Mains input
Output
Normal mode Bypass mode
～
－
－
～
－
－
Bypass input
Mains input
Output
～
－
－
～
－
－
Bypass input
Mains input
Output
Battery mode Maintenance Bypass mode
Figure 1-5 Operation schematic diagram
1.5.1 Normal Mode
When the mains input is normal, the load is supplied with voltage-stabilizing and frequency-stabilizing power by the
mains after processing of the rectifier and the inverter, and meanwhile, the charger is charging the battery, the
operation mode is Normal mode. In Normal mode, the mains indicator and the inverter indicator are on.
1.5.2 Bypass Mode
If the overload overtime, inverter or rectifier fault appears during the UPS operation in Normal mode, the UPS will
transfer to Bypass mode, that is, the load is powered by the bypass source, which comes directly from the mains
input. If the rectifier is normal, the internal charger will charge the battery. In Bypass mode, the inverter indicator is off;
the mains indicator and the inverter indicator are on.
警告
危 险
Note
In case of mains failure or mains voltage out of range (120Vac ~ 253/264/276Vac) in Bypass mode, the UPS will turn off and stop
the output.
