How and why are the Altistart Softstarts and Altivar AC Drives de-rated for altitude?

Issue:
Altistart Softstarts and Altivar AC Drives de-rated for altitude

Product Line:
Altivar AC Drive Altistart Softstarts

Environment:
All

Cause:
NA

Resolution:
As altitude increases, lower air pressure results in lower air density and 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 up to a maximum altitude.

For Altistart Softstarts the 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).

For AC Altivar and Process Drives - Consult the appropriate Installation manuals since derating varies by Installation features and frame size.

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