Earl Brunner on tue 10 aug 04
Don't know, but the controller did shut down when it determined that the
temperature was going UP instead of down. The kiln was under warranty still
so they replaced all of the relays. I understand what you are saying
though, I hadn't really thought it all of the way through, just going by the
experience, if the relay had stayed on, it wouldn't have shut down. I was
assuming something else shut it off.
Earl Brunner
Las Vegas, NV
_____
From: William Melstrom [mailto:william@handspiral.com]
Sent: Tuesday, August 10, 2004 10:20 AM
To: Clayart
Cc: brunv53@yahoo.com
Subject: Re: firing
Earl Brunner wrote:
Now that you mention it, one of our relay cubes DID stick in the on position
awhile back, it happened during a controlled cool down and the temperature
climbed, which caused the kiln to shut down. We only fire on ramp schedules,
I wonder if the kiln would exceed the max. temperature or would it error out
and shut down?
Earl, this does not make complete sense to me. Yes, the controller would
sense an error, and "shut down," but the relay would STILL be CLOSED ("on")
!!! and supplying power to the coil! -- even though the display might be
flashing "idle" or "error." A timer is a really good idea, or do an
expensive up-grade and get mercury switches, which requires a whole new
circuit board.
William Melstrom
Austin, Texas
www.handspiral.com
william@handspiral.com
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