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The Gen4T PSUs with the Product Numbers 071-000-609-01 and 071-000-611-01 will sometimes generate a noise that is higher than expected. Excerpt for Europa Platform Specifications: 5.8.1.4 Acoustic Requirements The Europa system platform shall meet the acoustic noise requirements defined in the EMC Environmental Requirements (P/N 108000336 Rev A20) document for Category 1 systems in the data center. The measured L wad sound power should be 7.5 Bels for both operating and idle states as per ISO specification 7779. The values measured onsite sometimes exceed 7.5 Bels (75 dB).
The PSU units run the fan at maximum speed when initially connected to AC power. The fan speed will ramp down in about 14 seconds when the supply is under moderate load. The fan speed will increase again when the supply is under very light load in order to produce load high enough for the voltage regulator to stabilize it. This behavior is caused by the way the PSU firmware has been designed to meet the safe operations requirements of the Switched-mode power supplies. There are 2 possible causes that have been identified so far: Cause #1: The problem occurs when there is a PSU with P/N 071-000-609-01 or 071-000-611-01 - manufactured by ACBEL POLYTECH INC paired with a PSU with P/N 071-000-608-01 - manufactured by FLEXTRONICS POWER INC in the same chassis. In such configuration, the FLEXTRONICS power supply will source the majority of the power and the ACBEL power supply output will drop below the 10% of full rated output. This will cause the increased speed of the fan in ACBEL power supply. Cause #2: On some Gen4T nodes that do not draw much power, the load on the ACBEL power supplies drops below the 10% of full rated output, causing higher fan RPMs. Examples of such nodes will be M600 data storage nodes, M1200 data storage nodes or utility nodes.
Cause #1: The recommended solution is to not have mixed pairs of power supplies. If a FLEXTRONICS power supply with P/N 071-000-608-01 (now discontinued) needs to be replaced then both power supplies should be replaced with P/N 071-000-611-01. Cause #2: Please contact Avamar Support for resolution.
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