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mowhoong@hotmail.com
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 Posted: Thu Nov 20, 2008 11:24 am Post subject: What went wrong ? |
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The barrel temperature of the moulding machine seem to be out of
control as the temperature kept rising . I had changed a new contactor
but the problem remains. Then I changed the themocouple and the
electronic temperature controller as well but the problem still was
not solved.
I could not figure out what went wrong as this had never happen
before.
Dear members can you give me some advice. Thank you.
Regards |
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john.spevacek@aspenresear
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| Posted: Thu Nov 20, 2008 5:10 pm Post subject: Re: What went wrong ? |
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On Nov 20, 5:24 am, "mowho...@hotmail.com" <mowho...@hotmail.com>
wrote:
[quote]The barrel temperature of the moulding machine seem to be out of
control as the temperature kept rising . I had changed a new contactor
but the problem remains. Then I changed the themocouple and the
electronic temperature controller as well but the problem still was
not solved.
I could not figure out what went wrong as this had never happen
before.
[/quote]
What are you running and what is the setpoint temperature? Is this a
reactive system which could be creating the exotherm?
John
Aspen Research, - www.aspenresearch.com
“Turning Questions into Answers”
Opinions expressed herein are my own and may not represent those of my
employer. |
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L Alpert
Guest
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| Posted: Fri Nov 21, 2008 4:53 am Post subject: Re: What went wrong ? |
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<mowhoong@hotmail.com> wrote in message
news:a9651771-cb13-4608-97bf-8747213b9da7@s9g2000prm.googlegroups.com...
[quote]The barrel temperature of the moulding machine seem to be out of
control as the temperature kept rising . I had changed a new
contactor
but the problem remains. Then I changed the themocouple and the
electronic temperature controller as well but the problem still was
not solved.
I could not figure out what went wrong as this had never happen
before.
Dear members can you give me some advice. Thank you.
Regards
[/quote]
Check for reversed thermocouples or plugs. |
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mowhoong@hotmail.com
Guest
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| Posted: Mon Nov 24, 2008 1:27 am Post subject: Re: What went wrong ? |
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On Nov 20, 2:53 pm, "L Alpert" <alpe...@xxgmail.com> wrote:
[quote]mowho...@hotmail.com> wrote in message
news:a9651771-cb13-4608-97bf-8747213b9da7@s9g2000prm.googlegroups.com...
The barrel temperature of the moulding machine seem to be out of
control as the temperature kept rising . I had changed a new
contactor
but the problem remains. Then I changed the themocouple and the
electronic temperature controller as well but the problem still was
not solved.
I could not figure out what went wrong as this had never happen
before.
Dear members can you give me some advice. Thank you.
Regards
Check for reversed thermocouples or plugs.
[/quote]
The material used is PC . I had replace a new set of controller ,T.C ,
contactor and also check that all electrical connection was properly
done, The contactor should be in a cut off posistion when the barrel
temp. has reach the set- temp. but it does not.
But yesterday the problem solved without any reason. I still don>t
know why ? |
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L Alpert
Guest
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| Posted: Wed Nov 26, 2008 6:59 am Post subject: Re: What went wrong ? |
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<mowhoong@hotmail.com> wrote in message
news:47063fcb-a704-4c64-8841-6c19bb72bed6@k24g2000pri.googlegroups.com...
On Nov 20, 2:53 pm, "L Alpert" <alpe...@xxgmail.com> wrote:
[quote]mowho...@hotmail.com> wrote in message
news:a9651771-cb13-4608-97bf-8747213b9da7@s9g2000prm.googlegroups.com...
The barrel temperature of the moulding machine seem to be out of
control as the temperature kept rising . I had changed a new
contactor
but the problem remains. Then I changed the themocouple and the
electronic temperature controller as well but the problem still
was
not solved.
I could not figure out what went wrong as this had never happen
before.
Dear members can you give me some advice. Thank you.
Regards
Check for reversed thermocouples or plugs.
[/quote]
The material used is PC . I had replace a new set of controller ,T.C ,
contactor and also check that all electrical connection was properly
done, The contactor should be in a cut off posistion when the barrel
temp. has reach the set- temp. but it does not.
But yesterday the problem solved without any reason. I still don>t
know why ?
----
Contactor....maybe a sticky coil, or a loose connection that caused
higher then normal current draw (but not enough to blow a fuse). Best
to go with proportional band instrumentation these days.
Can>t say I can recall the last time I have used on/off temperature
control, for this as well as many other reasons. |
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