How is the 50C rating accomplished in the Enclosed ATS22 Soft Start Controllers?
Resolution:
Engineering uses an oversized ATS22 softstart with de-rating based on temperature instead of adding a cooling fan.
Example:
ATS22C14S6U has 124 nominal motor current. We want 52C rating, so over nominal temperature (40C) by 12C.
We have a derating of 2.2% for every 1C over 40C.
52-40= 12.
12x2.2% = 26.4%.
26.4% of 124 = 32.24.
32.24 is the deduction for the 124 nominal motor current of ATS22C14S6U. So the ATS22C14S6U has only rated to 91.76A motor in 52C temperature.
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