Dell PowerVault MD1220 Manuel technique - Page 21
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INPUT PARAMETER
Input Voltage Range
Input Frequency
Peak Inrush Current
Power Factor over full AC input range
Minimum Efficiency measured 20%, 50%
and 80% output load over full range of AC
input and environmental conditions
Peak Output Power
6.1.1 Thermal management
The 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 four
fans 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 take
proper actions to throttle the fans in order to maintain optimal operating temperature.
6.1.2 Over-Temperature Shutdown
In order to prevent potential damage to the drives and subsequent loss of data, the power
supply has the capability to shut itself down or be shut down by the EMM, through embedded
firmware or host management software such as Dell™ Open Manage Storage Management, in
the event of an over-temperature condition. When the power supply incorporates its internal
thermal shutdown feature, it will automatically restart when the over temperature condition no
longer exists. Hysteresis of at least 5 degrees is employed to prevent a frequent toggling on
and off of the outputs.
** Available in Q3 2010
Table 12.
Power Supply Specifications
AC Characteristics
Requirement
90 – 264 VAC
47 – 63 Hz
55 A for 10ms or less, 25 A for 10-
150ms
0.9 @ output load > 90%
Must Meet Climate Savers requirements:
Load Condition
Efficiency
20%
87%
50%
90%
100%
87%
600 Watts
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