UPS5000-A-30 kVA & 40 kVA & 80 kVA
User Manual
Copyright © Huawei Technologies Co., Ltd.
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. Figure 2-4 shows a
conceptual diagram of the UPS working in bypass mode.
Figure 2-4 UPS conceptual diagram in bypass mode
2.2.2.3 Battery Mode
If the AC input voltage is not normal, the UPS transfers to battery mode to obtain power from
batteries. The inverter then converts the power into AC outputs. Figure 2-5 shows a
conceptual diagram of the UPS working in battery mode.
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