Huawei Updated H20-923_V1.0 Exam Questions and Answers by isla-grace

In UPS5000-H operation,normal modemeans the load is supplied by theinverter, and the rectifier/charger maintains the DC link and batteries. Themaintenance 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 isnot permitted to simply close the maintenance bypass switch while the UPS is in normal mode. The correct O&M logic is to perform acontrolled transferfirst (typically transferring the load tostatic bypasswith 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.

In Huawei data center facility equipment (such as precision cooling units and related controllers), alarm presentation follows a clear severity-based design so technicians can recognize urgency immediately without entering detailed menus. Acritical alarmrepresents the highest severity level and is treated as a condition that may impact safe operation, cooling continuity, or equipment protection. For this reason, the LCD controller uses the most prominent visual and audible indications: theindicator turns redto show critical severity, and thebuzzer sounds continuouslyto ensure the alarm cannot be overlooked in a noisy equipment-room environment. This behavior supports rapid response: O&M personnel can quickly identify that immediate action is required, then open the alarm list to locate the root cause, confirm whether the unit has derated or stopped, and execute the prescribed troubleshooting steps (for example, checking power status, sensor readings, fan/compressor status, water flow/pressure, and protection interlocks). Therefore, the statement correctly describes the standard critical-alarm indication method on the LCD controller.

In Huawei precision cooling commissioning, the wizard groups functional commissioning items so technicians can validate key subsystems efficiently. Thecooling system commissioningis mandatory because it verifies the primary control and protection loop that directly determines whether the unit can safely provide cooling capacity. This includes confirming the refrigeration or chilled-water cooling path can start and stop correctly, sensors and control logic are valid, and protection conditions (such as abnormal pressures/temperatures, flow conditions, or interlocks) behave as expected. Without completing cooling-system commissioning, the unit’s core purpose—stable temperature control for IT loads—cannot be assured, and the controller cannot reliably judge normal versus fault states during operation.

Other items (indoor fans, condensate pump, humidifier) are important butscenario-dependent: some sites do not use humidification, some drainage designs do not require an internal condensate pump, and fan checks can be handled as part of broader functional tests or may vary by redundancy configuration. Therefore, the wizard allows non-mandatory items to be deselected, but the cooling system commissioning must remain selected to complete a valid baseline commissioning workflow.

On Huawei data center cooling/monitoring controllers, menu permissions are typically organized so that routine O&M staff (operator role) can perform day-to-day adjustments that are required for normal running and integration, without accessing factory-only commissioning items. TheUser Settingsmenu is designed for operational configuration such as target temperature/humidity setpoints, control preferences, and other user-level parameters that need to be tuned to match the data hall environment and load changes. TheComm Settingsmenu is intended for communication configuration used in site integration, such as setting communication addresses, baud rates, protocol-related parameters, or enabling interfaces needed for upper-layer systems (for example, monitoring platforms). These settings are considered part of normal operation management and must be accessible so operators can maintain monitoring connectivity, replace controllers, or restore communication after changes. Higher-risk parameters (for example, factory calibration, protected control logic, or deep commissioning values) are normally restricted to higher privilege roles, but viewing and setting parameters withinUser SettingsandComm Settingsis an operator-allowed function.