Dell POWERVAULT MD1200 Technical Manualbook

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Contents

Dell POWERVAULT MD1200 Technical Manualbook Manual pdf 21 page image

** Available in Q3 2010 21Table 12. Power Supply SpecificationsAC CharacteristicsINPUT PARAMETER RequirementInput Voltage Range 90 – 264 VACInput Frequency 47 – 63 HzPeak Inrush Current 55 A for 10ms or less, 25 A for 10-150msPower Factor over full AC input range 0.9 @ output load > 90%Minimum Efficiency measured 20%, 50%and 80% output load over full range of ACinput and environmental conditionsMust Meet Climate Savers requirements:Load Condition20% 87%Efficiency50% 90%100% 87%Peak Output Power 600 Watts6.1.1 Thermal managementThe cooling system for the enclosure is designed to allow all components (power supplies,EMMs, HDDs, SSDs etc.) to meet their full operating specifications. There may be up to fourfans in each power supply/fan module. This configuration provides N+1 fan redundancy,meaning that the enclosure can be sufficiently cooled for normal operation even if one fan fails.Firmware shall continuously monitor the temperature sensors within the enclosure and takeproper actions to throttle the fans in order to maintain optimal operating temperature.6.1.2 Over-Temperature ShutdownIn order to prevent potential damage to the drives and subsequent loss of data, the powersupply has the capability to shut itself down or be shut down by the EMM, through embeddedfirmware or host management software such as Dell™ Open Manage Storage Management, inthe event of an over-temperature condition. When the power supply incorporates its internalthermal shutdown feature, it will automatically restart when the over temperature condition nolonger exists. Hysteresis of at least 5 degrees is employed to prevent a frequent toggling onand off of the outputs.

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