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What is the replacement for Altivar 18 drives?

Issue:
Need replacement drive for ATV18HU18N4.

Product Line:
ATV18, Altivar 18


Environment :
All

Cause:
ATV18 was obsoleted in the 1990's. 

Resolution:
Currently the ATV312 is the most equal in function and size.  Dimensions and programming may vary so consult the ATV312 installation and programming guides for differences. 
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