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    How and why are Altistart Softstart and AC Drive de-rated for altitude?

    Issue:
    How and why is the Altistart 48 de-rated for altitude?

    Product Line:
    ATS48 ATS22 Altistart Softstarts

    Environment:
    All

    Cause:
    Wiring

    Resolution:
    The lower air pressure results in lower air density and so the cooling is less efficient.
    There is also a maximum limit. This is due to the reduced air electrical resistance, which requires larger spacing to prevent arcing. The circuit boards and component spacing allows only a certain altitude and you can’t install it higher.

    Maximum Operating Altitude;

    3300 ft (1000 m) without de-rating. Above this, de-rate the

    nominal current by 2.2% for each additional 330 ft

    (100 m) to a maximum of 6600 ft (2000 m)

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