Converting G/D/C/B-Series Overtemp Threshold Percentages to Temperature Readings


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Article ID: 11520

Products
G-Series, firmware 1.02.00.0043 and higher
D-Series, firmware 6.03.01.0008 and higher
C5-Series, all firmware
C3-Series, firmware 1.02.01.0004 and higher
C2-Series, firmware 5.02.01.0006 and higher
B5-Series, all firmware
B3-Series, firmware 1.02.01.0004 and higher
B2-Series, firmware 4.02.01.0006 and higher

Goals
Convert a thermal threshold percentage (11747) to an equivalent temperature reading.

Solution
The thermal percentages actually indicate how close the sensor readings are to the maximum rating for the entire switch, and are not convertible to ambient temperature.

Because some thermal sensors are located near components that can run hot, an absolute temperature reading could result in a temperature beyond the ambient temperature limits that are published in the Installation Guides. Approximating ambient temperature is not practical because factors other than the environment (such as task loading, air flow, etc.) play a part in the sensor reading.

The general recommendation is to set a thermal threshold in the 65%-75% range. If the alarm is triggered, check the fans and the physical location (for air-flow obstructions or the wiring closet ambient temperature) to identify and remedy the cause of the alert. Setting the threshold too low could result in unnecessary false alarms.

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