UPS5000-E-(50 kVA-300 kVA) 
User Manual (50 kVA Power Modules) 
 
Copyright © Huawei Technologies Co., Ltd. 
 
Figure 2-3 UPS conceptual diagram in normal mode 
 
 
2.2.2.2 Bypass Mode 
The UPS automatically transfers to bypass mode upon detecting power module 
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.