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Option
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Description
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Total percent
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The sum of all percentages in the Percent On column in the Phases table. This value indicates the total percent of time that the system spends in operating phases. This field is display-only. If the total percent does not add up to 100 or exceeds 100, a warning message indicates this.
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Phases table
The following columns appear in the Phases table.
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Phase Name
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The unique name assigned to the phase. When the IEC TR 62380 or RDF 2000 model is selected for the top-most assembly (system), the values entered in this column appear in the list for Phase in the Pi Factors window. For more information, see Part Pi Factors.
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Phase Type
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Indicates the type of thermal variation in the phase. Choices are:
• Continuous/Dormant - When selected, the average thermal variation is calculated as the mean daily temperature variation that the equipment experiences each year. For equipment in environmentally controlled (benign) locations, this would amount to a variation of 0 degrees C. For outdoor equipment, the variation is the difference between the average daily high (day time) and low (night time) temperatures.
• On/Off — When selected (default), the temperature variation is determined using the equations for ΔΤ required by the appropriate IEC TR 62380 or RDF 2000 component model. If the result of these calculations is less than 3 degrees C, 0 degrees C is used per the specification.
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Air Temperature
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The outside ambient (environmental) temperature for the phase.
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System Temperature
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The temperature of the system when operating in this phase.
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Percent On
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The percentage of time the system operates in this phase per year. The values entered in this column affect Total percent, the read-only field above the table.
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Cycles/Year
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The number of thermal cycles experienced by the system in the corresponding phase each year.
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Temperature Rise
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The average outside daily temperature. This option is available only if the phase type is Continuous/Dormant. Continuous and dormant refer to two different types of phases that use identical equations for IEC TR 62380 or RDF 2000 calculations. Continuous is always on and does not experience internal (system) thermal cycling. Dormant (or storage) is never on and does not experience any internal (system) thermal cycling. Because the system temperature is constant, the only temperature stress the system might be subject to is the outside (environmental) thermal variation, such as day time and night temperatures.
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