New Lead2Passed H20-923_V1.0 Exam Questions| Real H20-923_V1.0 Dumps Updated on Aug 14, 2026
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NEW QUESTION # 10
Which O&M practice is most effective for identifying cooling inefficiency caused by airflow problems in an operating data center?
- A. Disable temperature sensors to prevent false alarms
- B. Compare rack inlet temperatures, return air temperatures, and fan speed trends to detect recirculation and bypass
- C. Lower supply air temperature to the minimum possible value at all times
- 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 # 11
ECO mode is not recommended when the load is less than
- A. 10%
- B. 30%
- C. 20%
- D. 5%
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 # 12
The default port number for logging in to the NetEco is
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
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 # 13
Which of the following statements are true about the industry trend of the data center cooling systems?
- A. Evaporative cooling systems become the main solution for large data centers.
- B. Cloud + AI - data centers enter a new energy-saving era.
- C. Higher inlet and outlet water temperatures are the trend of large data center cooling.
- D. Liquid cooling systems are widely used in high-density solutions.
Answer: B,C,D
Explanation:
As data center power density increases (especially driven by AI and high-performance computing), the industry trend is to adoptliquid coolingin high-density scenarios because liquid has much higher heat transfer capability than air, enabling stable cooling where rack power is very high. This makes statementAtrue. The combination ofCloud + AIpushes operators to reduce PUE and total energy cost through more intelligent control, higher efficiency cooling architectures, and integrated energy management, so statementBis also true.
For large data centers, another clear trend is increasingchilled-water supply/return temperatures(higher inlet and outlet temperatures). Warmer water improves chiller efficiency, expands the number of hours that free cooling can be used, and reduces compressor work, soDis true. However,evaporative coolingis not universally the "main solution" for large data centers because it is climate- and water-condition dependent and is typically deployed as one option among multiple architectures rather than the dominant default everywhere. Therefore, Cis the incorrect statement.
NEW QUESTION # 14
When the mains supply is stable, the UPS5000-H mainly works in which mode after ECO is configured?
- A. Static bypass
- B. Maintenance bypass
- C. Battery
- D. Normal
Answer: A
Explanation:
After ECO mode is enabled on the UPS5000-H, the system's control objective changes from "always supply the load through the inverter" to "maximize efficiency while keeping protection mechanisms ready." When themains input is within the configured ECO acceptance window(voltage, frequency, THD, and other quality thresholds), the UPS supplies the critical load primarily through thestatic bypass path, which has lower conversion losses than continuous double-conversion. The inverter remains synchronized and on standby, so if the mains quality deteriorates or an abnormal condition is detected, the UPS canrapidly transferthe load back to inverter operation to maintain output stability. Battery mode is only used when the rectifier/bypass source is unavailable or out of range, and maintenance bypass is a manual service path used for isolation during maintenance, not for normal energy-saving operation. Therefore, with stable utility power and ECO configured, the UPS5000-H mainly operates instatic bypass mode.
NEW QUESTION # 15
When a critical alarm is generated in a lithium battery cabinet and the buzzer beeps continuously, the status of the indicator on the MDU is
- A. Steady yellow
- B. Steady red
- C. Blinking red fast
- D. Blinking yellow fast
Answer: C
Explanation:
In Huawei lithium battery cabinet alarm design, the MDU indicator and buzzer are coordinated to help O&M personnel immediately judge alarm severity without logging into a management system. Acritical alarmindicates that the battery system may no longer be in a fully safe or supported operating state and requires urgent handling, such as load protection actions, isolation, or immediate inspection. For this highest severity level, the cabinet uses the most prominent visual pattern:red with fast blinking, paired with acontinuous buzzer, to ensure the condition cannot be overlooked in an equipment room environment. Yellow indicators are reserved for lower severities such as warnings or minor/major alarms, where the system remains controllable and the required response can be scheduled. A steady red is typically used to indicate a persistent fault state or stop condition, whereasfast blinking red + continuous buzzeris the clear "critical, urgent" combination that triggers immediate on-site response and rapid fault localization (such as checking protection events, contactor status, temperature/voltage exceptions, and isolation conditions).
NEW QUESTION # 16
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. Short-circuit copper bar between battery modules
- B. Battery general positive terminal
- C. Battery general negative terminal
- D. Battery positive terminal
- E. Battery negative terminal
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 # 17
During routine maintenance of the lithium battery cabinet, which of the following procedure is true about replacing a faulty battery module?
- A. 1-6-2-5-3-7-4
- B. 1-3-2-6-5-7-4
- C. 1-2-3-6-5-7-4
- D. 1-6-3-2-5-7-4
Answer: D
Explanation:
The correct sequence prioritizeselectrical safety first, then mechanical disassembly. You mustconfirm the batteries are not discharging(Step 1) to avoid working under load. Next, the cabinet must be placed into a safe powered-down state byswitching off the battery circuit breaker and long-pressing the POWER ON/OFF button to power off the cabinet(Step 6). Only after the cabinet is safely powered down should you open up the working area byremoving the front covers of the faulty module and adjacent modules(Step 3). Then youturn off the ready switchon the battery management module (Step 2) to prevent the system from re-enabling the module unexpectedly during maintenance. After that, youloosen the securing bolts and pull out the battery management module about 10 cm(Step 5) to create operating space and ensure isolation for subsequent operations. With the cabinet safely stopped, you canremove the cables and copper barsconnected to the faulty module (Step 7), and finallyremove the baffle plate and pull out the faulty battery module(Step 4).
NEW QUESTION # 18
Which of the following models is a Huawei in-room chilled water horizontal air supply product?
- A. FusionCol5000-A050H
- B. FusionCol8000-C210H
- C. NetCol5000-A070U
- D. NetCol8000-C070D
Answer: A
Explanation:
Huawei room-level air conditioning products are commonly identified by the series name plus a model suffix that indicates the cooling medium and airflow form factor. Anin-room chilled waterunit uses a chilled-water coil as the primary heat-exchange component and relies on the building's chilled-water system (chiller/plant) rather than an onboard refrigeration compressor for cooling generation. "Horizontal air supply" describes the discharge direction: the unit supplies conditioned air laterally into the room or into a specific airflow organization (such as cold-aisle delivery), supporting predictable airflow paths and stable return air conditions. Within the provided options,FusionCol5000-A050His the model that matches both identifiers: it belongs to Huawei's room cooling product line and the model code indicates an in-room configuration withchilled-watercapability andhorizontalair supply orientation. The other options belong to different series or represent configurations typically associated with other deployment forms (such as different placement, airflow direction, or system architecture). Therefore, the correct selection isFusionCol5000-A050H.
NEW QUESTION # 19
Which of the following can be used to start the inverter of the UPS5000-H?
- A. UPS WebUI
- B. ECC
- C. UPS LCD
- D. NetEco
Answer: A,C
Explanation:
For the Huawei UPS5000-H, inverter startup is executed through theUPS's own control interfaces, which provide the "Running Control / Inv. ON" operation with the required confirmations and permissions. TheUPS LCD (MDU touchscreen)supports inverter startup through menu operations such as selecting inverter start functions and confirming the action after authentication. TheUPS WebUIalso provides the same operational control path, where an operator logs in and issues theInv. ONcommand under the UPS monitoring/running control pages. These two interfaces are part of the UPS monitoring and control design and are explicitly used for commissioning and routine O&M actions.
By contrast,ECC(data center controller) andNetEco(management platform) are mainly used for site-level monitoring, alarm collection, visualization, reporting, and centralized management. While they can display UPS status and alarms (and may integrate with UPS data), inverter startup is defined as aUPS running control operationperformed on the UPS's LCD or WebUI control plane to ensure proper authorization, safety checks, and command traceability.
NEW QUESTION # 20
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 indoor fans
- B. Commissioning the cooling system
- C. Commissioning the condensate pump
- D. Commissioning the humidifier
Answer: B
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 # 21
When the outdoor unit is installed at a position higher than the indoor unit, install an oil trap every five to six meters in the vertical direction along the gas pipe to ensure system reliability.
- A. False
- B. True
Answer: B
Explanation:
This statement is true. In split DX/precision cooling refrigerant systems, the "gas pipe" typically refers to thesuction linereturning refrigerant vapor (and entrained compressor oil) from the indoor evaporator to the outdoor unit/compressor. When theoutdoor unit is higher than the indoor unit, the suction line includes avertical riser. Oil naturally tends to settle and flow downward under gravity, so without proper piping measures, oil may accumulate in low points or fail to be carried upward consistently, leading topoor oil return.
Insufficient oil return can cause compressor lubrication issues, abnormal noise, overheating, reduced efficiency, and long-term reliability risks. Installingoil trapsat the bottom of the riser and thenevery 5-6 metersof vertical lift helps collect oil and allows it to be periodically swept upward by refrigerant velocity, maintaining stable oil circulation. This requirement is especially important in data center cooling because continuous operation and high availability demand reliable compressor lubrication and stable refrigerant flow under varying load conditions.
NEW QUESTION # 22
What is the upstream input voltage range of the UPS5000-H?
- A. 138 V-485 V
- B. 220 V-240 V
- C. 360 V-600 V
- D. 380 V-415 V
Answer: A
Explanation:
For the Huawei UPS5000-H (380/400/415 V class), "upstream input voltage range" refers to the acceptableAC mains (rectifier) line-to-line input voltage windowthat the UPS can tolerate while maintaining operation. Huawei specifies a wide mains input voltage range of138-485 Vac (line voltage)to improve adaptability to weak or fluctuating power grids and to reduce unnecessary battery usage when the utility voltage sags or rises within allowable limits. Within this overall window, the UPS may applyderating rulesat lower voltages (for example, full-load operation is typically guaranteed only above a higher threshold), but the upstream input can still remain connected and the UPS continues supplying the load according to its control strategy and available capacity. The other options do not match the upstream AC input range:360-600 Vis commonly associated withbattery DC voltage ranges,220-240 Vis single-phase class, and380-415 Vrepresentsrated voltage, not the full acceptable upstream range.
NEW QUESTION # 23
Which of the following are the user roles of Power Partner?
- A. Service engineer
- B. Service manager of a rep office
- C. Inventory operations manager
- D. Startup engineer
- E. Project manager
- F. DOC
Answer: A,B,C,D,E,F
NEW QUESTION # 24
Which of the following interfaces is used to connect the controller and the main control module of the unit?
- A. DP
- B. SW
- C. USB
- D. I2C/12v
Answer: D
Explanation:
In Huawei precision cooling units, the LCD controller (human-machine interface) must exchange real-time operating data and commands with the unit's main control module while also receiving a stable low-voltage power supply. This connection is typically implemented as alow-voltage communication bus plus DC power, which is why the interface is identified asI2C/12V. TheI2Cportion provides the data channel used for status display, parameter viewing/setting (within permission scope), alarm presentation, and command delivery (such as mute, reset, or control enable actions). The12 Vportion supplies power to the controller so it can operate independently of high-voltage power circuits and remain safe to access during routine O&M.
Interfaces likeDPandUSBare not used as the internal control link between the HMI and the main control board in this type of unit, and "SW" is not the designated controller-to-main-board interface in the standard wiring definition. Therefore,I2C/12Vis the correct selection.
NEW QUESTION # 25
In a data center power distribution architecture, what is the primary function of a Static Transfer Switch (STS) for critical single-cord loads?
- A. Provide fast switching between two independent AC power sources to maintain continuity
- B. Convert AC power to DC power for IT equipment
- C. Increase the output frequency from 50 Hz to 60 Hz
- D. Reduce harmonic distortion by filtering non-linear loads
Answer: A
Explanation:
Huawei data center power distribution design prioritizes continuity for critical loads. For single-cord IT equipment that cannot accept dual inputs, an STS provides a practical high-availability approach by connecting the load to two independent AC sources (often A and B feeds) and transferring the load to the healthier source when abnormalities occur. The key value is speed and coordination: the STS detects voltage/frequency deviations or source failure and performs a rapid transfer to minimize or eliminate interruption seen by the load. This supports O&M strategies where upstream systems (UPS, PDUs, distribution boards) are maintained or isolated without forcing downtime on single-cord devices.
In routine operations, STS status, transfer logs, alarms, and source quality parameters are monitored to prevent nuisance transfers and to ensure correct upstream selectivity and grounding. Correct commissioning also ensures the two sources meet synchronization conditions and that bypass
/maintenance procedures are standardized, improving safety and reducing operational risk.
NEW QUESTION # 26
Which of the following is not a scenario-based solution for Huawei data center products?
- A. FusionModule2000
- B. FusionDC800
- C. FusionDC1000
- D. FusionModule500
Answer: B
Explanation:
Huawei's scenario-based data center facility portfolio is organized around clearly defined solution families that map to typical deployment scenarios and site sizes. FusionModule500 and FusionModule2000 are smart modular data center solutions designed for standardized, fast deployment in equipment rooms and enterprise edge/branch scenarios.They integrate key subsystems such as power supply and distribution, cooling, monitoring, and optional fire protection into a modular architecture that reduces footprint and accelerates on- site delivery. Likewise, FusionDC1000 is Huawei's prefabricated modular data center series, delivered as complete, factory-integrated modules that combine civil engineering elements with electromechanical infrastructure for rapid construction, predictable quality, and scalable expansion across different capacity tiers. In contrast, FusionDC800 is not used as a defined scenario-based solution name within Huawei's mainstream data center facility solution lineup (where "FusionDC" offerings are represented by the FusionDC1000 series and "FusionModule" offerings by numbered FusionModule solutions). Therefore, FusionDC800 is the option that does not match Huawei's scenario-based solution naming.
NEW QUESTION # 27
Which of the following are main components of Huawei indirect evaporative cooling system?
- A. Spray system
- B. Fan
- C. Air filter
- D. Heat exchanger
- E. Compressor
- F. Water pump
Answer: A,B,C,D,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 # 28
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. False
- B. True
Answer: B
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 # 29
If a component runtime overdue alarm is generated for an air conditioner, you can clear the device running time on the "Maint > Performance Maintenance" screen.
- A. False
- B. True
Answer: B
Explanation:
Huawei smart cooling/precision air-conditioning controllers manage preventive maintenance by trackingaccumulated runtimefor wear components such as indoor fans, compressors (where applicable), humidifiers, and pumps. When a component reaches its configured maintenance interval, the controller generates aruntime overdue alarmto remind O&M staff to inspect, service, or replace the component. After the required maintenance action is completed (for example, fan replacement, bearing inspection, cleaning, or pump servicing), the accumulated runtime record must becleared/resetso the next maintenance cycle can be measured correctly from zero. The controller provides this function under the maintenance feature set because it is part of lifecycle management and performance tracking rather than an alarm acknowledgement. The navigation pathMaint > Performance Maintenanceis used to access runtime statistics and to clear the corresponding device/component running time after maintenance. This avoids repeated overdue alarms for a component that has already been serviced and ensures future alarms accurately reflect the operating hours of the newly serviced or replaced parts, improving reliability and maintenance planning accuracy.
NEW QUESTION # 30
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