Grant,
I use a lot of these devices. They are wonderful! However an AC version will
turn on once, but never turn off on DC, until the power source is removed.
Internally there are a pair of SCRs back to back. If you use these against
an inductive load, you must use an RC filter across the output terminals and
I highly recommend using one rated for twice the use voltage, because back
EMF will kill'em dead. For your application, the same company makes SSRs for
DC in 5, 10 and 20 Amp versions. Again, for safety, use a diode in opposite
polarity across the output when using an inductive load for back EMF
reasons.
Steve


"Grant Erwin" wrote in message
.. .
I'm still working on getting my idle control working on my old Miller
gas-powered welder. (Kohler 16hp motor.) The idle control module is dead,
no replacements are available anywhere I've found, but the idle solenoid
on the motor still works.

So I'm going to wire a switch velcroed to my stinger. I figure for now
I'll
just run a pair of wires down each piece of welding lead, make the
connections
with spade lugs, and run the wires to the input of a small relay which
will
switch current on or off to the idle solenoid.

I have several identical SSRTs in my junkbox. They are Potter & Brumfield
part
no. SSRT-120D10. Here is a data sheet:
http://www.tinyisland.com/images/tem..._SSRT_0303.pdf

The control terminals are expecting between 8.5mA and 14mA current at
between
3-32VDC. The output can carry 10 amps rms at 110VAC.

What I want to know is if I can use this in the following way:

run 12VDC to the control inputs, with 1k ohm current limiting resistor in
series
switch 12VDC 2-3 amps load current

I'm certain that there is another part better suited to my requirement. My
question is whether I can make this one work.

If the output can handle 110VAC why couldn't it handle 12-14VDC?

Is a car battery through a 1kohm resistor sufficiently like a 12mA current
source?

Grant

--
Posted via a free Usenet account from http://www.teranews.com