Normal Mode; Bypass Mode - Liebert UHA1R-0100 User Manual

4 Chapter 1 Product Introduction
Bypass input
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Mains input
Bypass input
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Mains input
Battery mode

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.
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.
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Normal mode
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Figure 1-5 Operation schematic diagram
Liebert ITA 10kVA UPS User Manual
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Bypass input
Output
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Mains input
Bypass input
Output ～
Mains input
警告 危 险
Note
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Bypass mode
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Maintenance Bypass mode
Output
Output