SSI

ERP2U Power Supply Design Guide, V2.31

Table 3: AC Input Rating

PARAMETER

MIN

RATED

MAX

Voltage (110)

90 Vrms

100-127 Vrms

140

Vrms

 

 

 

 

 

 

Voltage (220)

180

Vrms

200-240 Vrms

264

Vrms

 

 

 

 

 

 

Frequency

47

Hz

 

63

Hz

 

 

 

 

 

 

5.4Input Under Voltage

STATUS

Required

The power supply shall contain protection circuitry such that application of an input voltage below the minimum specified in section 5.3 shall not cause damage to the power supply.

5.5Efficiency

STATUS

Recommended/Required

The following table provides recommended and required minimum efficiency levels. These are provided at three different load levels; 100%, 50% and 20%. The “required” minimum efficiency levels are for the purpose of proper power supply cooling when installed in the system. The “recommended” minimum efficiency levels are for the purpose of reducing the system’s AC power consumption. The efficiency is specified at 50% and 20% loading conditions to help reduce system power consumption at typical system loading conditions.

Efficiency shall be tested at AC input voltages of 115VAC and 230VAC. Refer to www.efficientpowersupplies.org for details on proper efficiency testing methods.

 

Table 4:

Efficiency

Loading

100% of maximum

 

50% of maximum

Required minimum

70%

 

72%

Recommended minimum

80%

 

83%

20% of maximum

65%

78%

5.6AC Line Dropout

STATUS

Required

An AC line dropout is defined to be when the AC input drops to 0 VAC at any phase of the AC line for any length of time. During an AC dropout of one cycle or less the power supply must meet dynamic voltage regulation requirements up to 75% of the rated output load. An AC line dropout of one cycle or less shall not cause any tripping of control signals or protection circuits. If the AC dropout lasts longer than one cycle or the load is greater than 75%, the power supply should recover and meet all turn on requirements. The power supply must meet the AC dropout requirement over rated AC voltages, frequencies, and output loading conditions. Any dropout of the

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SSI America ERP2U manual Input Under Voltage, Efficiency, AC Line Dropout, AC Input Rating

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