Power supply Subsystem
SPSH4 Server System External Product Specification
Revision
1.11
22
4.2.3 AC
Electrical Specifications
4.2.3.1
AC / DC Supply Redundancy
The power sub-system has three AC inlets, one for each power supply. Each power supply
does not rely on other modules for any functionality except for load sharing. AC input to the
power supply is fully isolated. Therefore, it is not subject to AC phase differential issues. All DC
outputs have a device to isolate the power supply from the main system power during a power
supply failure or during a hot swap operation. The SPSH4 server system has power redundancy
for any DC load condition in a 2+1 power supply configuration.
4.2.3.2
AC Input Voltage Ranges
The power supply incorporates universal power input with active power factor correction, which
reduces line harmonics in accordance with the EN61000-3-2 and JEIDA MITI standards. The
power supply operates within all specified limits over the input voltage range specified in Table
7. Harmonic distortion of up to 10% THD will not cause the power supply to go out of specified
limits. The power supply has a minimum efficiency of 60% to the DC output pins at maximum
load currents, at rated nominal input voltages and frequencies.
Table 7: AC Input Voltage Rating
Parameter
Minimum
Rated
Maximum
Max Input Current
(600W)
Voltage (110)
90 V
rms
100-127
V
rms
132
V
rms
12
A
rms
Voltage (220)
180 V
rms
200-240
V
rms
264
V
rms
6
A
rms
Frequency
47 Hz
50/60 Hz
63 Hz
-
4.2.3.3
AC Line Dropout and Hold-up Time
An AC line dropout is defined as when the AC input drops to 0VAC for one cycle or less during
any phase of the AC line. During an AC dropout, the power supply meets the dynamic voltage
regulation requirements over the rated load. Dynamic voltage regulation requirements may be
seen in Table 20.
An AC line dropout will not cause any tripping of control signals or protection circuits. If the AC
dropout lasts longer than one cycle then the power supply may shutdown but will recover and
meet all turn on requirements. The power supply meets the AC dropout requirements over all
rated AC voltages, frequencies, and output loading conditions. Any dropout of the AC line will
not cause damage to the power supply.
4.2.3.4
AC Line Transient Specification
AC line transient conditions are defined as “sag” and “surge” conditions. The sag conditions are
also commonly referred to as “brownout”. The sag condition is defined as the AC line voltage
dropping below nominal voltage. The surge conditions are defined as when the AC line voltage
rises above nominal voltage. The power supply meets the performance requirements under the
AC line sag and surge conditions shown in Table 8 and Table 9, respectively.
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