SSI America ERP2U manual AC Line Fuse, AC Inrush, AC Line Transient Specification, AC Line Sag

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SSI

ERP2U Power Supply Design Guide, V2.31

AC line shall not cause damage to the power supply. In the case of redundant AC inputs, the AC line dropout may occur on either or both AC inlet.

5.7AC Line Fuse

STATUS

Required

The power supply shall incorporate one input fuse on the LINE side for input over-current protection to prevent damage to the power supply and meet product safety requirements. Fuses should be slow blow type or equivalent to prevent nuisance trips. AC inrush current shall not cause the AC line fuse to blow under any conditions. All protection circuits in the power supply shall not cause the AC fuse to blow unless a component in the power supply has failed. This includes DC output load short conditions.

5.8AC Inrush

STATUS

Required

The power supply must meet inrush requirements for any rated AC voltage, during turn on at any phase of AC voltage, during a single cycle AC dropout condition, during repetitive ON/OFF cycling of AC, and over the specified temperature range (Top). The peak inrush current shall be less than the ratings of its critical components (including input fuse, bulk rectifiers, and surge limiting device).

STATUS

Recommended

An additional inrush current limit is recommended for some system applications that require multiple systems on a single AC circuit. AC line inrush current shall not exceed 40 A peak. After one-quarter of the AC cycle, the input current should be no more than the specified maximum input current from Table 3.

5.9AC 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.

Table 5: 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

100%

Nominal AC Voltage ranges

 

50/60 Hz

No loss of function or performance

cycle

 

 

 

 

 

>1 AC cycle

>10%

Nominal AC Voltage ranges

 

50/60 Hz

Loss of function acceptable, self

 

 

 

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Contents SSI ERP2U Power Supply Design Guide Disclaimer Contents Tables Error! Bookmark not definedFRU Device Product Information Area Conceptual Overview PurposeRequired Definitions/Terms/AcronymsRequired Optional Mechanical OverviewRecommended Acoustic Sound Power Levels Temperature RequirementsAcoustic Requirements Airflow RequirementsAC Input Voltage Specification AC Inlet ConnectorAC Input Requirements Redundant AC InletsEfficiency Input Under VoltageAC Line Dropout AC Input RatingAC Line Fuse AC Line Transient SpecificationAC Inrush AC Line Sag Transient PerformanceAC Line Surge Transient Performance AC Line Fast Transient SpecificationAC Line Surge Output Connectors DC Output SpecificationRequired Baseboard power connector P1 Baseboard Power ConnectorRequired Peripheral Power Connectors 2 +12V4 Baseboard Power ConnectorRequired Floppy Power Connector Peripheral Power ConnectorsServer Signal Connector Serial ATA Power ConnectorFloppy Power Connector Server Signal ConnectorGrounding Output Power/CurrentsRemote Sense 550 W Load Ratings650 W Load Ratings 600 W Load Ratings750 W Load Ratings 700 W Load RatingsVoltage Regulation Fan operation in standby modeStandby Outputs 800 W Load RatingsCapacitive Loading Dynamic LoadingVoltage Regulation Limits Transient Load RequirementsCapacitve Loading Conditions Ripple / NoiseRipple and Noise Hot Swap Requirements RedundancyOutput Voltage Timing Timing RequirementsDescription Recommended Description Turn On/Off TimingTurn On/Off Timing Current Limit Protection Circuits240VA Protection Over Current ProtectionOver Voltage Protection Over Temperature ProtectionOver Voltage Limits Output VoltagePson # Signal Characteristic Signal Type Control and Indicator FunctionsPwok delay PSON#Power Supply Management Interface Pwok Power OKPwok Signal Characteristics SMBus CommunicationModule FRU Data Module FRU Data Format Field Replacement Unit FRU SignalsProduct Info Area FRU Device InformationMultiRecord Area LED IndicatorsField Name PS Info Field Information Definition Power Supply LEDs LED Indicators10Agency Requirements Mtbf

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