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Posted by Grant Erwin on December 3, 2007, 10:44 pm
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I have an old Miller welder with a bad idle control module. It's supposed
to energize an electromagnet-type (pull) solenoid mounted on the carburetor
which pulls the governor arm to the idle position, and to sense when there
is weld current, in which case it deenergizes the idle solenoid. The idle
solenoid still works. The bad part is obsolete and unobtainable.
I'm wondering if there isn't a way I could rig a remote switch to turn on
or off that solenoid by hand. It would be a pain, but better than having
no idle control at all.
Ideas?
Grant Erwin
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Posted by JR North on December 3, 2007, 11:02 pm
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Mebbe take the module to a TV shop, A tech there MAY be able to 'shoot
it and repair the problem (bad caps, prolly). If it's an IC, fergetit.
JR
Dweller in the cellar
Grant Erwin wrote:
> I have an old Miller welder with a bad idle control module. It's supposed
> to energize an electromagnet-type (pull) solenoid mounted on the carburetor
> which pulls the governor arm to the idle position, and to sense when there
> is weld current, in which case it deenergizes the idle solenoid. The idle
> solenoid still works. The bad part is obsolete and unobtainable.
>
> I'm wondering if there isn't a way I could rig a remote switch to turn on
> or off that solenoid by hand. It would be a pain, but better than having
> no idle control at all.
>
> Ideas?
>
> Grant Erwin
>
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Posted by Jon Elson on December 4, 2007, 12:27 am
Please log in for more thread options JR North wrote:
> Mebbe take the module to a TV shop, A tech there MAY be able to 'shoot
> it and repair the problem (bad caps, prolly). If it's an IC, fergetit.
Even then, as long as the label hasn't been burned off or erased
for "trade secrets" it would likely be something standard. This
sounds like a REALLY simple circuit. An op amp, maybe, senses a
small voltage across a resistor and switches on/off a power
transistor. Shouldn't need more than 10 - 15 parts.
Jon
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Posted by BobH on December 3, 2007, 11:15 pm
Please log in for more thread options Grant Erwin wrote:
> I have an old Miller welder with a bad idle control module. It's supposed
> to energize an electromagnet-type (pull) solenoid mounted on the carburetor
> which pulls the governor arm to the idle position, and to sense when there
> is weld current, in which case it deenergizes the idle solenoid. The idle
> solenoid still works. The bad part is obsolete and unobtainable.
>
> I'm wondering if there isn't a way I could rig a remote switch to turn on
> or off that solenoid by hand. It would be a pain, but better than having
> no idle control at all.
Hi Grant,
Is the obsolete/unobtainable part a complete board or is it a specific
part on the board? If it is a complete board, is there any information
available on the board like maybe a schematic? Also, is the board
accesible or is it potted in epoxy or something similar?
I would not expect that module to be horribly complicated and if you can
get to the components, it should be fixable. Lack of docs would make it
harder, but probably not impossible. Also, there are shops that sell
idle control modules. These guys advertise some: http://www.weldtron.com
BobH
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Posted by Jon Elson on December 4, 2007, 12:29 am
Please log in for more thread options BobH wrote:
> Is the obsolete/unobtainable part a complete board or is it a specific
> part on the board? If it is a complete board, is there any information
> available on the board like maybe a schematic?
Miller gives out full circuit board schematics on their welders,
so they should have one for this module. You may have to dig
DEEP into their obsolete product files.
Jon
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> to energize an electromagnet-type (pull) solenoid mounted on the carburetor
> which pulls the governor arm to the idle position, and to sense when there
> is weld current, in which case it deenergizes the idle solenoid. The idle
> solenoid still works. The bad part is obsolete and unobtainable.
>
> I'm wondering if there isn't a way I could rig a remote switch to turn on
> or off that solenoid by hand. It would be a pain, but better than having
> no idle control at all.
>
> Ideas?
>
> Grant Erwin
>