APPS: Seeking Field Controller Replacement

Sat Nov 15 11:36:33 EST 2008

==> Automation List post by Carl Ellis...
To view or reply to this thread: http://www.control.com/thread/1226605015#1226765099

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Re: APPS: Seeking Field Controller Replacement
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For clarification: the NEMA 4 rating for the UDC is for the bezel/faceplate being sealed to NEMA 4 standards when used with the factory bezel gasket and the 4 screws that tighten the faceplate to chassis (part of the UDC's NEMA 4 package).  

Like any panel mount box, the enclosure has to be NEMA 4, too, like Roy mentioned, because the behind-the-panel parts of a UDC are exposed to the elements.

I suspect that a strip heater wrapped around the UDC case close to the display (I saw an trade journal ad just recently for self-regulating strip heaters, somewhere (?)) would provide sufficient heat to keep a UDC display running well below freezing, but I've never done it, all ours are mounted indoors.

UDC serial Modbus over RS-485 works great.  Avoid the ethernet Modbus, it has problems.

Carl
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