Steve,
I'm not familiar with the Conceptronic Oven, but when I've bought larger
ovens, they were tested under load. We completely filled the oven with
material, and measured several places to insure that the oven reacted to
different loading conditions. The gains, offsets, etc. for the controllers
were set to react promptly to changes in the loading.
We have a very small oven (4 zones). I do have problems with loading down
the heaters if I run very large boards. When you send the first board
through, it doesn't react fast enough, and then when it does react, it
overshoots for the next board. Luckily, most of our hybrids are 1 inch x 1
inch, so I don't have problems.
Your 7 zone production oven should not have loading issues. Perhaps the
vendor can help you out by calibrating the controllers to handle the type
of loads that your are seeing.
Dave Anderson
Medtronic, Inc.
>>> <[log in to unmask]> 05/28/98 09:56am >>>
All,
Hello again...ready for another question from a newbie??
Again, I am getting some information about convection reflow
ovens that I do not necessarily buy into.
We have a Conceptronic HVN-102 7 zone reflow oven. We have
been advised that during production runs, we will need to
place 'buffer' circuit assemblies before and after each
actual production assembly to properly load the heaters in
our oven or, as we are told, our zone temps will drop to an
unacceptable level.
I am of the opinion that as long as each zone doesn't drop
more than (help me here...fill in the blank) ___ Deg. C.
then everything is good. Or as long as the board
temperature profile is acceptable. I can understanding
profiling the oven to understand what loading it can accept,
but I don't expect our oven to experience any unacceptable
loading on any one assembly that we may process.
Any insight into this would be appreciated.
Steve McBride
[log in to unmask]
(405) 624-5281
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