62 Q&As in UPDATED H20-923_V1.0 Exam Questions Certification Test Engine to PDF
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NEW QUESTION # 37
During routine maintenance of the lithium battery cabinet, which of the following areas should be protected from electric shocks caused by exposed hands or metal objects?
- A. Battery general negative terminal
- B. Battery negative terminal
- C. Battery positive terminal
- D. Battery general positive terminal
- E. Short-circuit copper bar between battery modules
Answer: A,B,C,D,E
Explanation:
In a lithium battery cabinet, any exposed conductive part that is electrically connected to the DC power path can present shock and arc risk, especially when technicians are using tools in a narrow space. Thegeneral positive/negative terminalsare the cabinet-level high-energy connection points, and accidental contact or bridging with a metal object can cause severe DC arcing, burns, and equipment damage. Thebattery positive and negative terminalson individual modules are also hazardous because each module contributes to the total string voltage and fault current capability. In addition, theshort-circuit copper bar between battery modulesis a direct conductive link in the series/parallel connection; it can be energized and can create an instant short circuit if contacted by tools, jewelry, or loose hardware. Huawei maintenance safety practice therefore requires insulating covers, protective shields, and strict tool control to prevent exposed hands or metal objects from contactinganyof these areas. Protecting all listed points reduces electric shock risk, prevents arc flash/arc burn incidents, and avoids unintended cabinet trips or permanent damage to terminals and busbars.
NEW QUESTION # 38
In alarm management, the status can be identified by masking rules.
- A. Standard
- B. Maintenance
- C. Invalid
- D. Valid
Answer: B,C
Explanation:
In Huawei alarm management,masking rulesare used to control how alarms are handled and displayed during specific conditions, such as planned maintenance, commissioning, device replacement, or known temporary abnormalities. When a masking rule is applied, the system can change how an alarm is classified so that O&M staff can distinguish between alarms that require immediate action and alarms that are expected or should be excluded from operational statistics. Two key statuses that masking rules can assign areMaintenanceandInvalid.Maintenanceindicates the alarm is generated during an approved maintenance activity (for example, power-off tests, sensor rewiring, cooling maintenance), so it is treated as expected and does not trigger normal escalation logic.Invalidindicates the alarm is not considered effective for operational follow-up-commonly used when a point is confirmed to be non-applicable, temporarily disabled, or its triggering condition is not meaningful to current operations. By contrast,ValidandStandardrepresent normal alarm handling states rather than outcomes specifically "identified by masking rules."
NEW QUESTION # 39
Which of the following are the functions of the SmartLi 3.0 battery control unit (BCU)?
- A. Fault diagnosis and protection
- B. Internal short circuit prediction
- C. Charge and discharge management
- D. Group capacity test
- E. Intelligent voltage sharing and active current balancing control
- F. Management on the BMU of each battery module
Answer: A,B,C,D,E,F
Explanation:
In Huawei SmartLi 3.0, the BCU acts as the cabinet-level "brain" of the lithium battery system, coordinating measurement, control, protection, and communication. Itmanages and supervises BMUsinside the cabinet by collecting key operating data such as voltage, temperature, SOC, and SOH, and by aggregating module information for higher-level management. The BCU supportscharge/discharge managementby monitoring string current and controlling operating behaviors to keep the battery within safe electrical and thermal limits.
To ensure consistent performance across parallel strings and cabinets, it implementsintelligent voltage sharing and active current balancing, which helps equalize currents, improve utilization, and reduce uneven aging. For safety and reliability, the BCU providesfault diagnosis and protection, including handling events such as overvoltage, undervoltage, overcurrent, and overtemperature, and it can isolate abnormal loops when required. SmartLi 3.0 also incorporatesinternal short-circuit risk predictionas part of its safety strategy. Finally, group capacity testingis supported as a maintenance function to verify usable capacity and system health.
NEW QUESTION # 40
The default port number for logging in to the NetEco is
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
Explanation:
In Huawei NetEco access design, the Web client is reached usingHTTPSto protect credentials and management data in transit. During initial deployment and commissioning, engineers access the NetEco login page by entering the server IP address followed by thedefault HTTPS service port. Huawei's standard login method specifies that users open a browser and enterhttps://NetEcoserver IP:31943to access the NetEco login interface. This port is therefore treated as the default Web login port in typical on-premises NetEco deployments, and it is the baseline value referenced in installation and login guidance. Other ports may appear in specific tools, customized scenarios, version variants, reverse-proxy deployments, or when security policy requires port changes, but those are exceptions driven by planning or product packaging. For exam and commissioning purposes, the correct default login port is the one used by the NetEco Web client entry point under the standard deployment model:31943.
NEW QUESTION # 41
If the startup password authentication for a smart module is not complete, the ECC800-Pro WebUI and app cannot be used for commissioning.
- A. True
- B. False
Answer: A
Explanation:
In Huawei smart module commissioning and O&M workflows,startup password authentication is a mandatory security initialization stepfor the controller and its management channels. The ECC800-Pro provides WebUI and mobile app access for tasks such as device discovery, parameter setting, site configuration, alarm verification, and functional commissioning. Before these commissioning functions are allowed, the system requires completion of startup authentication actions, typically includinginitial password setup or password change, confirmation of authentication policies, and activation of secure access control. This prevents unauthorized users from entering the management plane during the critical initial stage when default credentials or incomplete security settings could exist. If startup password authentication is not completed, the platform restricts access to commissioning pages and app-based commissioning features, ensuring that configuration changes, device binding, and control operations cannot be executed until the controller is placed into a compliant, secured state. This design aligns with data center facility management best practices where commissioning must begin only after management access is hardened and auditable.
NEW QUESTION # 42
The NetEco supports manual backup and automatic backup.
- A. True
- B. False
Answer: A
Explanation:
NetEco is a management platform that stores critical operational data, including site configuration, device models, user/role information, historical alarms, trend data, reports, and northbound integration settings. To protect these assets and ensure service continuity, NetEco provides a built-in backup mechanism that supports bothmanualandautomaticbackup modes.Manual backupis typically used before major operations such as version upgrades, configuration changes, northbound interface adjustments, or large-scale device onboarding, so engineers can create a restore point on demand.Automatic backupis used for routine risk control and is normally implemented through scheduled tasks, allowing backups to be generated at defined intervals to reduce data-loss exposure in case of hardware failure, system corruption, or accidental misconfiguration. In standard O&M practice, automatic backups are combined with retention policies (for example, keeping a rolling set of backup files), storage capacity checks, and periodic restore verification to confirm backup integrity. This dual-mode backup capability is a foundational requirement for stable long-term operation of management systems like NetEco.
NEW QUESTION # 43
After the battery module is installed, the torque and insulation should be checked according to the specified requirements.
- A. True
- B. False
Answer: A
Explanation:
This statement is true because post-installation verification is a mandatory acceptance step for battery systems in data centers. After a battery module is installed,torque verificationensures that all power terminals, interconnect bars, and grounding points meet the specified tightening requirements. If torque is too low, contact resistance increases, which can cause abnormal heating, voltage drop, nuisance alarms, and even connector damage during high current charge/discharge. If torque is too high, threads, lugs, or busbars can be damaged, creating hidden reliability risks.Insulation testingconfirms that the battery circuit has no unintended leakage paths to chassis or ground and that cable routing, connector seating, and protective covers are correct.
This is especially important for lithium battery cabinets where high DC voltage and large fault current capability demand strict electrical isolation. Performing torque and insulation checks after installation reduces early-life faults, improves safety, and ensures the cabinet can pass commissioning tests and enter stable service under UPS charge/discharge control.
NEW QUESTION # 44
After installing the FusionCol8000-C (110-440 kW), inject water to preserve the pressure for the chilled water pipes to how many MPa. After 30 minutes, check that no leakage occurs. Preserve the pressure for 24 hours. If the pressure drop is less than 0.01 MPa and no leakage occurs, the pipes do not leak.
- A. 0.8
- B. 0
- C. 1.2
- D. 0.5
Answer: A
Explanation:
For FusionCol8000-C chilled-water systems, Huawei commissioning requires awater leakage/pressure- holding teston the chilled-water piping after installation to verify joint sealing, valve interfaces, and connection integrity before long-term operation. The specified method is toraise the water pressure in the chilled-water pipe to 0.8 MPa, then observe for30 minutesto confirm there is no visible leakage. If the system remains dry, the same pressure isretained for 24 hoursas a stability verification step. The acceptance criterion is that thepressure drop is less than 0.01 MPaover the 24-hour period and no leakage is found, which demonstrates that the piping and fittings meet tightness requirements under the prescribed test pressure. This procedure helps prevent future failures such as slow seepage, corrosion around joints, insulation waterlogging, and unexpected shutdowns caused by water loss or low differential pressure alarms. It also ensures that subsequent flushing, venting, and operational commissioning can be performed safely and reliably.
NEW QUESTION # 45
The NetEco northbound interface does not support the SNMP protocol. Only WebService interfaces are supported.
- A. False
- B. True
Answer: A
Explanation:
In Huawei's data center facility management architecture, thenorthbound interfaceof NetEco is designed specifically to integrate with upper-layer systems such as enterprise NMS platforms, SOC/monitoring centers, and customer unified O&M systems. To meet common industry integration practices, NetEco northbound capabilities are not limited to only one interface type. In addition to WebService-style interfaces used for richer data exchange and structured integration, NetEco also supportsSNMP-based northbound integration, which is widely used for alarm forwarding, basic status monitoring, and interoperability with standard network management tools. SNMP is particularly common in mixed-vendor environments because it enables a lightweight and standardized method to deliver key alarms and events to a customer's central monitoring platform without requiring deep application coupling. Therefore, the statement that "only WebService interfaces are supported and SNMP is not supported" is incorrect: NetEco northbound integration supports SNMP along with other northbound interface methods depending on the integration scenario and customer requirements.
NEW QUESTION # 46
The UPS5000-H-1200 kVA and UPS5000-H-1600 kVA have two power cabinets and one bypass cabinet, and are equipped with the MDU, ECU, and surge protection box.
- A. False
- B. True
Answer: A
Explanation:
This statement is incorrect because it combines two different frame configurations into one description. In the UPS5000-H family,cabinet composition depends on capacity. For theUPS5000-H-1200 kVA, the user manual' s exterior description shows asingle power cabinet plus a bypass cabinet, together with theMDU. In other words, 1200 kVA is not described as "two power cabinets + one bypass cabinet" in its standard cabinet topology. By contrast, theUPS5000-H-1600 kVAis a wider frame and its maintenance/structure description explicitly showsPower cabinet 1, Power cabinet 2, and a bypass cabinet, and the product documentation also includes component sections for items like thesurge protection boxandMDU. Because the 1200 kVA model does not match the "two power cabinets" description, the combined statement (covering both 1200 kVA and
1600 kVA) isfalse, even though the "two power cabinets + one bypass cabinet" part is valid for 1600 kVA.
NEW QUESTION # 47
If the SPD indicator of a smart module is green, the SPD is running properly. If the SPD indicator is red, the SPD is faulty and must be replaced immediately.
- A. True
- B. False
Answer: A
Explanation:
In Huawei data center power distribution design, theSPD (Surge Protective Device)provides overvoltage surge protection for sensitive loads by diverting transient energy to ground through internal protection components. The SPD status indicator is used for O&M judgment of protection availability. When the indicator isgreen, it indicates the SPD protection components arewithin normal working conditionand the surge protection path remains effective. When the indicator turnsred, it typically means the SPD's internal protection element hasdegraded or disconnected(end-of-life or failure after cumulative surges), and the device can no longer provide the rated protection level. In this condition, the distribution system is left exposed to surge risk, especially during thunderstorms, switching operations, or upstream disturbances. Therefore, Huawei O&M practice treats ared SPD indicator as a replacement trigger, requiring immediate corrective action: confirm alarm/status, ensure safe isolation following electrical safety procedures, and replace the SPD module to restore protection and maintain power system reliability.
NEW QUESTION # 48
ECO mode is not recommended when the load is less than
- A. 5%
- B. 10%
- C. 20%
- D. 30%
Answer: C
Explanation:
ECO mode is designed to improve UPS efficiency by supplying the load mainly through the static bypass path when the mains is within the acceptable quality window, while keeping the inverter synchronized and ready to take over quickly if power quality degrades. However, when the load istoo light, the overall operating characteristics of the UPS system are less favorable for ECO operation. At low load levels, the benefits of ECO in reducing conversion losses are smaller, and the system becomes more sensitive to frequent transfers caused by minor mains fluctuations, which can increase transfer##and operational risk. In addition, very light loads can reduce the effectiveness of system self-check behaviors and may lead to less stable operating margins for parallel systems, power modules, and downstream distribution, depending on site conditions.
Therefore, Huawei O&M guidance sets a practical threshold and states thatECO mode is not recommended when the load is lower than 20%, helping ensure stable operation, fewer unnecessary transfers, and better overall power supply reliability for critical loads.
NEW QUESTION # 49
Which of the following are main components of Huawei indirect evaporative cooling system?
- A. Air filter
- B. Compressor
- C. Water pump
- D. Spray system
- E. Fan
- F. Heat exchanger
Answer: A,C,D,E,F
Explanation:
Huawei's indirect evaporative cooling system is designed to use theoutdoor air as a "free" cold sourcewhile keeping the data hall supply air isolated from outdoor contaminants and moisture. Its core is theheat exchanger, where heat from the indoor (return) air side is transferred to the outdoor working air side without mixing the two air streams. To enhance heat removal on the outdoor side, aspray systemwets the evaporation media or spray section, and awater pumpcirculates water to maintain uniform wetting and stable evaporation performance.Fansdrive airflow through the indoor and outdoor paths to ensure sufficient heat transfer and maintain the required air volume and pressure. Because outdoor air is involved on the working-air side,air filtersare required to reduce dust and protect the heat exchanger and internal airflow channels, improving reliability and reducing maintenance. Acompressoris not a main component of indirect evaporative cooling because the system primarily relies on evaporation and heat exchange rather than mechanical refrigeration.
NEW QUESTION # 50
Which O&M practice is most effective for identifying cooling inefficiency caused by airflow problems in an operating data center?
- A. Lower supply air temperature to the minimum possible value at all times
- B. Compare rack inlet temperatures, return air temperatures, and fan speed trends to detect recirculation and bypass
- C. Disable temperature sensors to prevent false alarms
- D. Run humidification continuously regardless of ambient conditions
Answer: B
Explanation:
Huawei facility O&M methods emphasize using monitored operating data to locate inefficiencies before they become faults. Airflow-related cooling inefficiency commonly appears as hot spots at rack inlets, elevated return air temperature fluctuations, abnormal fan speed increases, or uneven temperature distribution across aisles. By trending rack inlet temperature sensors alongside cooling unit supply
/return temperatures and fan speed or airflow commands, operations teams can distinguish between insufficient cooling capacity and poor airflow organization. Recirculation (hot air returning to rack inlets) often raises localized inlet temperatures without a proportional rise in room average temperature, while bypass (cold air short-circuiting back to returns) reduces cooling effectiveness and can drive fans to higher speeds unnecessarily. Data-driven checks support targeted corrective actions such as sealing cable openings, adjusting floor tile placement, restoring containment integrity, balancing airflow, or optimizing setpoints. This approach improves thermal stability, prevents overcooling, reduces energy waste, and aligns with Huawei's emphasis on integrated monitoring and closed-loop optimization for reliable, efficient operation.
NEW QUESTION # 51
Which of the following is the procedure for replacing a damaged UPS power module onsite?
- A. ##
- B. ##
- C. ##
- D. ##
Answer: D
Explanation:
For onsite replacement of a UPS power module, Huawei's maintenance logic follows a safe "isolate # remove
# insert # re-enable" sequence controlled by the moduleready switch. During removal, the ready switch must be rotated to theOFFstate first so the module is logically isolated from operation and will not participate in power conversion. After isolation, the four fixing screws are removed and a short waiting period is required to allow internal energy in capacitors to discharge before the module is pulled out. This matches statement#.
During installation, the ready switch must remainOFFbefore insertion to prevent unintended startup or arcing during connector engagement. The module is placed in position, inserted slowly and evenly until fully seated, then secured with the four screws. Only after mechanical fastening and full seating is confirmed should the ready switch be rotated to theONstate to allow the system to recognize and bring the module online. This matches statement#.
NEW QUESTION # 52
During wizard startup, when you enter the screen for selecting commissioning items for the first time, all items are selected by default. Which item is mandatory. You can deselect other commissioning items that are not mandatory.
- A. Commissioning the cooling system
- B. Commissioning the humidifier
- C. Commissioning the indoor fans
- D. Commissioning the condensate pump
Answer: A
Explanation:
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.
NEW QUESTION # 53
After the unit is powered on for the first time, it enters the compressor preheating state. To quickly perform power-on commissioning, you can manually shut down the compressor preheating.
- A. False
- B. True
Answer: A
Explanation:
Compressor preheating is a protection mechanism used during first power-on (and after long power-off periods) to improve compressor reliability before allowing refrigeration startup. The preheating function warms the compressor oil and reduces refrigerant migration and oil dilution, which otherwise can lead to liquid refrigerant in the compressor crankcase. If the compressor starts when oil is diluted or when liquid refrigerant is present, it increases the risk of abnormal noise, poor lubrication, high mechanical stress, and even liquid strike, which can damage the compressor and shorten service life. For data center cooling equipment, where continuous reliability is essential, the commissioning logic treats preheating as a required prerequisite for safe compressor operation. Therefore, O&M practice does not recommend bypassing or manually shutting down compressor preheating just to accelerate commissioning. The correct approach is to keep the unit energized and allow the preheating period to complete, then proceed with commissioning steps (fans, cooling system tests, alarms, and control verification) under proper protection conditions.
NEW QUESTION # 54
Operators can view parameters and set parameters on the "User Settings" and "Comm Settings" menus.
- A. True
- B. False
Answer: A
Explanation:
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.
NEW QUESTION # 55
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