Huawei H20-923_V1.0 Exam Dumps - PDF Questions and Testing Engine
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NEW QUESTION # 15
The frequency of power supply equipment can be 50 Hz, 60 Hz, or 70 Hz.
- A. False
- B. True
Answer: A
Explanation:
In data center power systems, the utility grid frequency standard iseither 50 Hz or 60 Hz, depending on the country/region. Data center facility equipment-such as UPS systems, power distribution units, switchgear, and monitoring components-is designed to operate reliably under these standardized grid frequencies, with acceptable tolerance ranges around the nominal value. While some power conversion equipment can adapt between50/60 Hz(for example, via frequency tracking or double-conversion),70 Hz is not a standard utility frequencyused for data center facility power supply, and it is not treated as a normal operating frequency in typical design, acceptance testing, or O&M procedures. From an operations perspective, maintaining correct frequency is critical because abnormal frequency can trigger UPS transfer logic, increase losses, create synchronization issues with bypass sources, and negatively affect downstream IT loads. Therefore, stating that power supply equipment frequency "can be 50 Hz, 60 Hz, or 70 Hz" is incorrect for standard data center infrastructure practice.
NEW QUESTION # 16
Which of the following statements are true about the routine maintenance of a UPS?
- A. If there is no alarm on the UPS panel, do not need to check the installation environment, temperature, and humidity onsite.
- B. Routine maintenance of vulnerable components: Periodically check the UPS fan operation, whether there is noise, and whether the rotation speed is abnormal.
- C. Environment check: Check whether the temperature and humidity of the equipment room meet the recommended environment requirements. Check whether the equipment room is clean and tidy.
- D. UPS status check: Check whether the UPS works in normal mode, whether an alarm is generated, and whether the UPS is in a proper load.
Answer: B,C,D
Explanation:
Routine UPS maintenance is preventive by design, so it must cover bothenvironmental conditionsandequipment operating status, not only alarms. The equipment room environment directly affects UPS reliability: high temperature accelerates capacitor aging, reduces battery/rectifier reliability, and may trigger derating; improper humidity increases the risk of condensation or electrostatic discharge; dust and poor housekeeping raise the risk of blocked airflow and overheating. Therefore, theenvironment checkin option A is a standard routine item. Option B is also essential because O&M personnel must confirm the UPS is innormal operating mode, verify no hidden alarms exist in the event log, and ensure the load level is within the recommended range to maintain redundancy and efficiency. Option C is true because fans are typical
"wear-out" components; abnormal noise or speed changes often appear before a failure and can be detected early through inspection. Option D is false: absence of a front-panel alarm never replaces onsite environmental inspection and basic preventive checks.
NEW QUESTION # 17
ECO mode is not recommended when the load is less than
- A. 10%
- B. 20%
- C. 5%
- D. 30%
Answer: B
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 # 18
On the ECC800-Pro WebUI, the PUE configuration mode can be "Standard" or "User-defined".
- A. True
- B. False
Answer: A
Explanation:
Huawei's ECC800-Pro supports PUE (Power Usage Effectiveness) management as part of its energy efficiency and green data center features. In practical O&M, different sites calculate PUE differently depending on metering topology, what loads are included (IT load only vs. auxiliary loads), and whether the site uses integrated modules (UPS, cooling, lighting, etc.) or external systems. To handle these real-world differences, the ECC800-Pro provides two PUE configuration approaches on the WebUI."Standard"mode is used when the site's metering points and calculation logic align with a predefined Huawei template, enabling rapid commissioning and consistent reporting."User-defined"mode is used when the customer's metering structure or management requirements differ-allowing engineers to select specific measurement points, define inclusion/exclusion rules, and tailor the calculation path so that displayed PUE matches the site's accepted KPI definition. This dual-mode design ensures PUE is both standardized where possible and flexible where necessary, improving energy analysis accuracy and supporting optimization actions.
NEW QUESTION # 19
Which of the following is the procedure for replacing a damaged UPS power module onsite?
- A. ##
- B. ##
- C. ##
- D. ##
Answer: A
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 # 20
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. Run humidification continuously regardless of ambient conditions
- C. Compare rack inlet temperatures, return air temperatures, and fan speed trends to detect recirculation and bypass
- D. Lower supply air temperature to the minimum possible value at all times
Answer: C
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 # 21
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 # 22
The software installation package does not need to be downloaded for the preinstalled server.
- A. True
- B. False
Answer: A
Explanation:
In Huawei delivery scenarios, apreinstalled servermeans the target software (for example, the NetEco platform and its required runtime components) has already been deployed and integrated on the server image before it is handed over for on-site commissioning. Because the installation media has already been applied, the on-site engineer's work typically shifts from "software installation" to "environment verification and initialization," such as confirming OS/service status, checking resource allocation, validating database and middleware health, verifying network planning (IP, gateway, DNS/NTP as required), and completing application-level initialization (site creation, user/role configuration, northbound interface settings, and device
/model import if needed). In this case,downloading the full installation package is not a mandatory stepfor commissioning, because the package is mainly required when performing a fresh installation or reinstall
/upgrade. However, standard practice is still to prepare supporting materials (patches, licenses, and compatibility documents) and ensure the preinstalled version matches the project baseline before acceptance.
NEW QUESTION # 23
Which of the following are the functions of the SmartLi 3.0 battery control unit (BCU)?
- A. Management on the BMU of each battery module
- B. Charge and discharge management
- C. Internal short circuit prediction
- D. Group capacity test
- E. Intelligent voltage sharing and active current balancing control
- F. Fault diagnosis and protection
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 # 24
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 # 25
Which of the following can be used to start the inverter of the UPS5000-H?
- A. NetEco
- B. UPS LCD
- C. UPS WebUI
- D. ECC
Answer: B,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 # 26
Which of the following statements are true?
- A. Huawei UPS5000-H is a modular UPS. If a module fails, it can be replaced online.
- B. When mains and bypass input of the UPSs share one power source, if mains outage occurs, the UPS cannot work in bypass mode.
- C. When the UPS works in static bypass mode, if the mains input outage occurs suddenly, the UPS automatically switches to battery mode.
- D. When the UPS works in normal mode, you can directly turn on the maintenance bypass switch.
Answer: A,B,C
Explanation:
In Huawei UPS operating logic and standard data center O&M practice, themaintenance bypassis a mechanical path used to isolate the UPS for service. Innormal modethe load is carried by the inverter, so you shouldnot directly close the maintenance bypasswithout a controlled transfer procedure; doing so can create an unsafe parallel path or impact synchronization, therefore statementA is false. Instatic bypass mode, the load is supplied through the bypass path; if the bypass/mains source fails, the UPS can perform an automatic transfer from bypass to inverter, and the inverter will be supported by thebatterythrough the DC link, soB is trueunder the expected functional behavior.UPS5000-His designed as amodular UPS, supportingonline (hot) replacementof power modules to restore capacity without shutting down the entire system, soC is true. If therectifier mains input and bypass input share the same source, a mains outage removes the bypass source as well, meaning bypass operation is not available, soD is true.
NEW QUESTION # 27
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 # 28
Through device management, you can view the information about
- A. Alarm
- B. Service period
- C. Overview
- D. Signal
Answer: A,B,C,D
Explanation:
In Huawei smart module management (such as on the ECC800-Pro/WebUI),Device Managementis used to centrally view and maintain managed objects (UPS, SmartLi, rPDU, sensors, air conditioners, etc.).
TheOverviewpage provides a consolidated snapshot of a device's operating status, key parameters, running mode, and basic identification information so engineers can quickly judge whether the device is healthy and online. TheAlarmview lists active and historical alarms related to the device, supporting rapid fault isolation and verification after recovery. TheSignalview shows monitoring points and I/O status (including analog values and digital inputs/outputs where applicable), which helps engineers confirm sensor wiring, linkage logic, and real-time state changes during commissioning and troubleshooting. TheService periodinformation is used for lifecycle and maintenance planning, such as tracking service time, maintenance intervals, or component life indicators where supported, enabling preventive maintenance and reducing unexpected downtime. Therefore, Device Management supports viewing all four categories.
NEW QUESTION # 29
When the mains supply is stable, the UPS5000-H mainly works in which mode after ECO is configured?
- A. Maintenance bypass
- B. Static bypass
- C. Normal
- D. Battery
Answer: B
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 # 30
Which of the following statements is false about how to start an electric heater?
- A. When "Dehumidification heating" is selected, the electric heater determines whether to start based on the current temperature only when the dehumidification function is enabled.
- B. If "Dehumidification & Low temperature heating" is selected, the electric heater determines whether to start based on the temperature requirements when the dehumidification or heating conditions are met.
- C. When "Low temperature heating" is selected, the electric heater determines whether to start only based on the temperature requirements no matter whether the dehumidification function is enabled.
- D. When "Dehumidification heating", "Low temperature heating", or "Dehumidification & Low temperature heating" is selected, if the temperature in the equipment room is low, the air conditioner automatically starts the heating function to meet the temperature control requirements of the equipment room.
Answer: D
Explanation:
Huawei precision cooling logic separates heater enablement into distinct control strategies to avoid unnecessary heating and to keep humidity control stable. InLow temperature heating, the heater is governed purely by the room temperature control demand: if temperature is below the heating threshold (or below setpoint with heating conditions met), the heater can start regardless of whether dehumidification is enabled, which matches statement D. InDehumidification heating, the heater is not a general low-temperature heater; it is an auxiliary function used to prevent overcooling during dehumidification and to maintain temperature while the unit dehumidifies. Therefore, the heater in this mode is permitted to start only when thedehumidification function is activeand temperature conditions require compensation, which matches statement B. Statement C is false because it incorrectly claims thatanyof the three selections will start heating automatically whenever room temperature is low; that is not true for "Dehumidification heating" unless dehumidification is actually enabled and running.
NEW QUESTION # 31
Which of the following are the user roles of Power Partner?
- A. Startup engineer
- B. Service manager of a rep office
- C. Service engineer
- D. Project manager
- E. Inventory operations manager
- F. DOC
Answer: A,B,C,D,E,F
Explanation:
Power Partner is Huawei Digital Power's partner service platform used to support delivery, commissioning, maintenance, and service operations across the full lifecycle of a project. To match real project workflows, the platform defines multiple user roles that align with different responsibilities and permission scopes. AStartup engineerfocuses on commissioning activities such as obtaining startup authorization, performing initial configuration, and completing functional verification. AService engineerhandles routine maintenance, inspections, troubleshooting, part replacement guidance, and closure of service cases. AProject managercoordinates delivery milestones, resource planning, and overall service execution to ensure acceptance criteria are met. AnInventory operations managermanages materials/parts flow, tracking, and availability to support timely repair and maintenance. TheDOC (Delivery/Dispatch Operations Center)role supports centralized operations such as work order dispatching, progress supervision, and process compliance.
Aservice manager of a representative officetypically oversees regional service quality, governance, and authorization control, ensuring the right people have the right access and that services are delivered according to Huawei process requirements.
NEW QUESTION # 32
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 # 33
In a data center fire protection design, which approach best matches Huawei facility practice for protecting IT rooms while minimizing secondary damage to IT equipment?
- A. Install a water sprinkler system as the only suppression method inside the IT white space
- B. Deploy a smoke detection system plus a clean-agent gas extinguishing system with interlock controls for automatic release
- C. Disable automatic suppression to avoid accidental discharge
- D. Use only portable extinguishers and rely on manual response
Answer: B
Explanation:
Huawei data center facility design typically follows a layered fire protection concept: early detection, controlled alarm linkage, and suppression methods that protect equipment and ensure personnel safety.
A smoke detection system (often combined with staged alarms) provides early warning so operators can verify events and initiate emergency procedures. For the IT white space, a clean-agent gas extinguishing system is preferred because it suppresses fire without leaving residue and significantly reduces the risk of corrosion or contamination compared with powder-based agents. The extinguishing system is normally integrated with linkage/interlock controls: audible/visual pre-discharge alarms, time delay, emergency abort, door access control logic, and HVAC shutdown or damper control to help maintain agent concentration. This coordinated mechanism reduces false discharge risk while preserving a reliable automatic response if a real fire develops. In contrast, relying only on manual extinguishers is too slow for rapid fire growth, and water sprinklers alone can cause substantial collateral damage to servers and power equipment.
NEW QUESTION # 34
In IT scenarios, which of the following are the power supply and distribution components of the FusionDC1000A?
- A. AC/DC power system
- B. Power PDB
- C. Integrated UPS
- D. SmartLi
Answer: B,C,D
Explanation:
In the FusionDC1000A IT scenario, the power chain is built around an AC input, conditioned backup power, energy storage, and final distribution to the IT racks.Integrated UPSis the core power-conditioning component, providing voltage and frequency stabilization and uninterrupted supply during mains disturbances. The UPS works together withSmartLi, Huawei's lithium battery system, which serves as the energy storage unit to sustain the load during outages and to support controlled shutdown or generator switchover. After UPS output, power is delivered to the IT loads through thePower PDB, which performs downstream distribution, branch protection, and organized cable termination toward rack PDUs or IT equipment feeders. By contrast, anAC/DC power systemis typically associated with DC bus supply used in telecom-oriented or dedicated DC load scenarios, not the standard IT scenario architecture of FusionDC1000A that is centered on UPS plus battery plus AC distribution. Therefore, the correct components for IT scenarios are SmartLi, Power PDB, and Integrated UPS.
NEW QUESTION # 35
In a data center power distribution architecture, what is the primary function of a Static Transfer Switch (STS) for critical single-cord loads?
- A. Convert AC power to DC power for IT equipment
- B. Reduce harmonic distortion by filtering non-linear loads
- C. Provide fast switching between two independent AC power sources to maintain continuity
- D. Increase the output frequency from 50 Hz to 60 Hz
Answer: C
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 # 36
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 # 37
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. True
- B. False
Answer: A
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 # 38
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