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UPS5000-A-400 kVA
User Manual (50 kVA, PF=0.9)
Figure 2-2 UPS conceptual diagram
2.2.2 Working Modes
2.2.2.1 Normal Mode
When the UPS works in normal mode, the rectifier converts the AC input voltage into the DC
voltage, which is then raised to the bus voltage by the power factor correction (PFC) circuit.
Then one part of the voltage passes through the DC-DC circuit to charge the battery string,
and the other part is converted by the inverter into AC voltage outputs. The two conversions
ensure high-precision and high-quality output voltages, protecting loads from interferences
such as input harmonics, burrs, and voltage transients.
diagram of the UPS working in normal mode.
Figure 2-3 UPS conceptual diagram in normal mode
2.2.2.2 Bypass Mode
If the inverter does not start or is manually shut down after the UPS is powered on, the bypass
supplies power to loads. The UPS automatically transfers from normal mode to bypass mode
if it detects power unit overtemperature, overload, or other faults that may cause the inverter
to shut down. The bypass power supply is not protected by the UPS which means it may be
affected by mains outage, and incorrect AC voltage or frequency.
conceptual diagram of the UPS working in bypass mode.
Issue 03 (2020-01-10)
Copyright © Huawei Technologies Co., Ltd.
Figure 2-3
shows the conceptual
Figure 2-4
shows a
2 Overview
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