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Huawei H20-923_V1.0 Exam - Topic 8 Question 2 Discussion
Topic #: 8
The maintenance bypass switch cannot be turned on when the UPS5000-H works in normal mode.
In UPS5000-H operation, normal mode means the load is supplied by the inverter, and the rectifier/charger maintains the DC link and batteries. The maintenance bypass switch (maintenance bypass breaker) is a mechanical isolation path intended to keep the load powered while the UPS is taken out of service for inspection or repair. Because it changes the power path and can create unsafe or unintended parallel paths if operated incorrectly, it is not permitted to simply close the maintenance bypass switch while the UPS is in normal mode. The correct O&M logic is to perform a controlled transfer first (typically transferring the load to static bypass with proper synchronization and confirmation that bypass power is healthy), and only then close the maintenance bypass switch so the UPS can be safely isolated. This prevents disturbance to the load, avoids synchronization/transfer hazards, and protects personnel from incorrect switching operations. Therefore, the statement is true in the sense of standard UPS5000-H operating procedure and safety interlock intent.
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