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NEW QUESTION # 16
After the battery module is installed, the torque and insulation should be checked according to the specified requirements.
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 # 17
Which of the following statements are true?
Answer: A,B,D
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 # 18
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.
Answer: C
Explanation:
For FusionCol8000-C chilled-water systems, Huawei commissioning requires a water leakage/pressure-holding test on the chilled-water piping after installation to verify joint sealing, valve interfaces, and connection integrity before long-term operation. The specified method is to raise the water pressure in the chilled-water pipe to 0.8 MPa, then observe for 30 minutes to confirm there is no visible leakage. If the system remains dry, the same pressure is retained for
24 hours as a stability verification step. The acceptance criterion is that the pressure drop is less than 0.01 MPa over 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 # 19
Which of the following statements is false about the advantages of the free cooling solution for data centers?
Answer: D
Explanation:
Free cooling is a mainstream energy-saving concept in data center cooling design, used to reduce chiller compressor runtime by leveraging low outdoor temperatures (air-side) or low cooling-water temperatures (water-side) during suitable seasons. Therefore, describing the technology as "not mature enough and should be used with caution" is the false statement when discussing its advantages. In practice, free cooling has broad industry adoption and is considered a proven approach when applied with correct engineering, such as proper filtration, anti-condensation control, heat exchanger selection, and automatic control strategies. Its advantage is that it can directly utilize the outdoor "cold source" to remove heat, which significantly reduces cooling power consumption compared with full mechanical refrigeration, improving overall energy efficiency and supporting lower PUE targets. It also makes full use of seasonal and day-night temperature differences: the system dynamically switches among free cooling, partial free cooling, and mechanical cooling to balance reliability and efficiency. The key point is maturity: the benefit of free cooling comes from well-established principles and widely implemented architectures, not experimental technology.
NEW QUESTION # 20
ECO mode is not recommended when the load is less than
Answer: A
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 # 21
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