Ac Line Transient Specification; Ac Line Fast Transient Specification; Table 4: Ac Line Sag Transient Performance; Table 5: Ac Line Surge Transient Performance - Intel Entry Redundant Power 2U ERP2U Design Manual

5.8 AC Line Transient Specification

STATUS
Recommended
AC line transient conditions shall be defined as "sag" and "surge" conditions. Sag conditions (also referred to as
"brownout" conditions) will be defined as the AC line voltage dropping below nominal voltage. Surge conditions
will be defined as the AC line voltage rising above nominal voltage.
The power supply shall meet the requirements under the following AC line sag and surge conditions.
Duration Sag
Continuous 10%
0 to 1 AC 100%
cycle
>1 AC cycle >10%
Duration Surge
Continuous 10%
0 to ½ AC 30%
cycle

5.9 AC Line Fast Transient Specification

STATUS
Recommended
The power supply shall meet the EN61000-4-5 directive and any additional requirements in IEC1000-4-5:1995
and the Level 3 requirements for surge-withstand capability, with the following conditions and exceptions:
These input transients must not cause any out-of-regulation conditions, such as overshoot and
undershoot, nor must it cause any nuisance trips of any of the power supply protection circuits.
The surge-withstand test must not produce damage to the power supply.
The supply must meet surge-withstand test conditions under maximum and minimum DC-output load
conditions.

Table 4: AC Line Sag Transient Performance

AC Line Sag
Operating AC Voltage
Nominal AC Voltage ranges
Nominal AC Voltage ranges
Nominal AC Voltage ranges

Table 5: AC Line Surge Transient Performance

AC Line Surge
Operating AC Voltage
Nominal AC Voltages
Mid-point of nominal AC
Voltages
ERP2U Power Supply Design Guide, V1.0
Line Frequency Performance Criteria
50/60 Hz No loss of function or performance
50/60 Hz No loss of function or performance
50/60 Hz Loss of function acceptable, self
recoverable
Line Frequency Performance Criteria
50/60 Hz No loss of function or performance
50/60 Hz No loss of function or performance
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SSI