H20-923_V1.0 Exam Dumps - Huawei HCSP-Field Questions and Answers

Huawei data center facility design emphasizes controlling airflow paths to raise cooling efficiency and stabilize IT inlet temperatures. The hot aisle/cold aisle layout creates a predictable airflow direction: cold air is supplied to the front of IT racks (cold aisle), while hot exhaust air is isolated and returned to the cooling system (hot aisle). When aisle containment is added, it prevents hot and cold air from mixing, which directly improves cooling utilization, reduces overcooling demand, and lowers fan energy. This layout also supports more accurate temperature control, enabling higher supply air temperatures while still meeting server inlet requirements—an important lever for improving overall energy efficiency. Huawei modular and smart module concepts commonly standardize rack alignment, containment components, and sensor-based monitoring so the airflow system remains consistent as capacity scales. Compared with random rack placement or uncontrolled airflow, containment-based hot/cold aisle planning delivers measurable operational stability, simpler troubleshooting, and better conditions for capacity expansion without redesigning the entire cooling path.

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.”

Huawei green data center concepts focus on reducing energy consumption through engineering controls rather than sacrificing resilience. Raising the allowable supply air temperature is a proven efficiency lever because it reduces compressor workload, expands economization opportunities where applicable, and can reduce fan energy when airflow is optimized. However, it must be implemented with airflow management—especially hot/cold aisle containment—to ensure server inlet temperatures remain within safe limits. Adaptive control is critical: monitoring rack inlet temperatures, cooling unit performance, and environmental conditions allows the system to dynamically adjust cooling output, fan speed, and setpoints to match real IT load. This avoids the common inefficiency of “overcooling for safety.” When combined with standardized O&M procedures, alarm thresholds, and continuous trend analysis, the strategy improves overall energy performance while preserving reliability and service continuity. In contrast, permanent oversizing or forcing all redundant systems to run fully loaded wastes energy and can reduce operating efficiency. Properly engineered, monitored optimization delivers efficiency gains with controlled operational risk.

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 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.

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.

Smart cooling temperature and humidity control is based on where the control “reference point” is measured and regulated.Supply air controluses the unit outlet sensor as the main reference, so the system directly regulates the temperature (and humidity when configured) of the air delivered to the IT area. This provides stable supply conditions and is widely used for predictable airflow organization.Return air controluses the unit inlet/return sensor as the reference, reflecting the heat absorbed from IT loads; it helps the unit respond to real load changes and maintain stable operation when room mixing or load distribution varies.Cold aisle controluses sensors placed in the cold aisle (near rack inlets) as the reference, aligning control with the most critical point for IT reliability—server intake conditions—especially in contained aisle scenarios.Hot aisleis generally not used as a primary temperature-and-humidity control mode because hot aisle conditions are intentionally high and variable (driven by load and containment), and controlling to hot aisle targets can conflict with ensuring stable rack inlet temperature and proper dehumidification behavior. Therefore, A, B, and C are valid control modes.

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.

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.

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.