by the power factor correction (PFC) circuit. One part of the voltage passes
through the DC-DC circuit to charge the battery, and the other part is converted
by the inverter into AC voltage output. The double-conversion process ensures the
precision and quality of the output voltage, protecting loads from interferences
such as input harmonics, burrs, and voltage transients.
Figure 2-3 Normal mode
2.3.2 Bypass Mode
After power-on, the UPS works in bypass mode if the inverter does not start or has
been manually shut down. In normal mode, the UPS transfers to bypass mode
when it detects power unit overtemperature, overload, or other faults that may
cause the inverter to shut down. The power supply in bypass mode is not
protected by the UPS and therefore tends to be aected by the mains outage and
abnormal AC voltage waveform or frequency.
Figure 2-4 Bypass mode
UPS5000-A-(30 kVA-120 kVA)
User Manual 2 Product Overview
Issue 17 (2024-02-21) Copyright © Huawei Digital Power Technologies Co., Ltd. 25
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