Ac line fast transient specification, Table 4: ac line sag transient performance, Table 5: ac line surge transient performance – SSI America EPS2U User Manual
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SSI
EPS2U Power Supply Design Guide, V2.1
Table 4: AC Line Sag Transient Performance
AC Line Sag
Duration
Sag
Operating AC Voltage
Line Frequency
Performance Criteria
Continuous
10%
Nominal AC Voltage ranges
50/60 Hz
No loss of function or performance
0 to 1 AC
cycle
100%
Nominal AC Voltage ranges
50/60 Hz
No loss of function or performance
>1 AC cycle
>10%
Nominal AC Voltage ranges
50/60 Hz
Loss of function acceptable, self
recoverable
Table 5: AC Line Surge Transient Performance
AC Line Surge
Duration
Surge Operating AC Voltage
Line Frequency
Performance Criteria
Continuous
10%
Nominal AC Voltages
50/60 Hz
No loss of function or performance
0 to ½ AC
cycle
30%
Mid-point of nominal AC
Voltages
50/60 Hz
No loss of function or performance
5.8 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.
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