Intel® Server System R2000WF Product Family Technical Product Specification
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AC line dropout of any duration does not cause tripping of control signals or protection circuits. If the AC
dropout lasts longer than the holdup time, the power supply recovers and meets all turn on requirements.
The power supply meets the AC dropout requirement over rated AC voltages and frequencies. A dropout of
the AC line for any duration does not cause damage to the power supply.
Table 15. AC line holdup time, 1100 W power supply
Loading
Holdup time
70%
10msec
Table 16. AC line holdup time, 1300 W power supply
Loading during AC dropout / holdup
Holdup time / Dropout duration
0% to 70% of rated load
10msec
3.3.4.1
AC Line 12 VSB Holdup
The 12 VSB output voltage stays in regulation under its full load (static or dynamic) during an AC dropout of
70 msec minimum (12 VSB holdup time) whether the power supply is in an ON or OFF state (PSON asserted
or de-asserted).
3.3.5
AC Line Fuse
The power supply has one line fused in the single line fuse on the line (hot) wire of the AC input. The line
fusing is acceptable for all safety agency requirements. The input fuse shall be a slow blow type. AC inrush
current does not cause the AC line fuse to blow under any conditions. All protection circuits in the power
supply do not cause the AC fuse to blow unless a component in the power supply has failed. This includes
DC output load short conditions.
3.3.6
AC Inrush
AC line inrush current does not exceed (55 A peak – 1100 W PSU, 35 A peak – 1300 W PSU), for up to one-
quarter of the AC cycle, after which the input current is no more than the specified maximum input current.
The peak inrush current is less than the ratings of its critical components (including input fuse, bulk rectifiers,
and surge limiting device).
The power supply meets the inrush requirements for any rated AC voltage during turn on at any phase of AC
voltage, during a single cycle AC dropout condition, upon recovery after AC dropout of any duration, and
over the specified temperature range (T
op
).
3.3.7
AC Line Transient Specification
AC line transient conditions are defined as “sag” and “surge” conditions. “Sag” conditions, also commonly
referred to as “brownout,” are defined as the AC line voltage dropping below nominal voltage conditions.
“Surge” is defined as conditions when the AC line voltage rises above nominal voltage.
The power supply meets the requirements under the following AC line sag and surge conditions.
Table 17. AC line sag transient performance (10 sec interval between each sagging)
Duration
Sag
Operating AC Voltage
Line Frequency
Performance Criteria
0 to 1/2 AC cycle
95%
Nominal AC Voltage ranges
50/60Hz
No loss of function or performance
> 1 AC cycle
>30% Nominal AC Voltage ranges
50/60Hz
Loss of function acceptable, self-recoverable
