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Join Date: Feb 2011
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High Temperature Service - For Controllers

04/10/2013 12:36 PM

Hello, what would you consider or prefer, you got to design controllers for drives and for motors when at environmental condition, surrounding Temperature of control room reaches 40~58degC.

Would you prefer logic relays- why?

or with PCB based control? Why?

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Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

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#1

Re: High Temperature Service - For Controllers

04/10/2013 1:29 PM

I would be much more worried how hot my motors and drive electronics would be in these temperatures than the controller.

To answer your question requires a lot more detail but my initial preference would be to use a harsh environment PLC. No sparks from contacts in a hot environment and flexibility in a loose design.

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#2

Re: High Temperature Service - For Controllers

04/10/2013 3:19 PM

I would use the same modern, reliable control gear and just keep the control cabinet cool with air conditioning, vortex cooler, intelligent design (sun shades, insulation, etc), etc if I couldn't keep the control room itself cool using the same methods.

Fix the source of the problem and all that jazz.

58 degree temperatures are not that high, and although it will degrade controllers containing capacitors if a cooling solution is not economically viable then locating the controller in a cooler place or just plain reducing its end of life and replacing often is really the only option if you want anything more than contactor-based control.

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#3
In reply to #2

Re: High Temperature Service - For Controllers

04/13/2013 1:13 PM

the site is actually inside the milk processing environment. Aircondition is not advisable-foremost moisture on the vicinity as this would inhibit microbes that might contaminate the product.

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