Re: solid state relay?


"Grant Erwin" <grant@xxxxxxxxxxxxxxxxxx> wrote in message
news:4765e756$0$26028$88260bb3@xxxxxxxxxxxxxxxxxxxx
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 ***:
www.tinyisland.com/images/temp/ENG_DS_1308242_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

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A solid state relay designed for A.C. loads will not work to switch a D.C.
load
on and off. The solid state relays i have worked with use a scr or a triac
to turn
the load on and off. If you turn on a scr or triac in a D.C. circuit it will
stay on
until you disconect the power from the scr or triac, in other words the SSR
will latch
in the on state until you remove the power from the SSR.

Best Regards
Tom.



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