RE: [CAD_CAM_EDM_DRO] Hitachi converter and high altitudes

I saw that in the spec too.

I'ts just thinner air = less convective cooling.

IIRC you can use them higher, but you have to derate
them unless you use a fan on the heat sink.

I don't think they mention that-so the spec is a bit silly
as written.

Les

Leslie M.Watts
L M Watts Furniture
Tiger Georgia
(706) 212-0242

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-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com]On Behalf Of Polaraligned
Sent: Wednesday, October 05, 2005 7:56 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Hitachi converter and high altitudes


Why does the hitachi VFD converters have in their
spec sheets to use the converters at an altitude of
1000m or less?

Scott