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Re: [Shop-talk] Two SSRs from one PID controller

To: shop-talk@autox.team.net
Subject: Re: [Shop-talk] Two SSRs from one PID controller
From: "John T. Blair" <jblair1948@cox.net>
Date: Thu, 01 Oct 2020 23:26:00 -0400
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At 07:09 PM 10/1/2020, lee@automate-it.com wrote:

 >I want to operate two solid-state relays simultaneously (one for a 
110V circuit,
 >the other for 220V) from a single PID. I had thought I would just 
wire them in
 >parallel from the PID, but a bit of poking around the interwebs suggests
 >otherwise. So I sketched up this drawing for two SSRs in series 
with a PID. Does
 >this look correct for this situation? Any suggestions appreciated!

Lee,

I don't know where you got the idea that putting them in parallel 
would not work.
Nor do I know if a PID is really the correct tool to use here.

You don't really say what or why you are trying to control.

In series, both solid state relays would have to close at the same 
time to cause and both load would be energized.  Not know what your 
are trying to do, I'd
think you'd want to be able to turn either one or off regardless of 
the state of the
other relay, which would require a seperate output line for each ssr.

You might be better off using one of the micro controllers like a 
Raspberry pi controller,  Arduino, or the BASIC stamp.

John


John T. Blair  WA4OHZ     email:  jblair1948@cox.net
Va. Beach, Va                  Phone:  (757) 495-8229

           48 TR1800    48 #4 Midget    65 Morgan 4/4 Series V (B1106)
      75 Bricklin SV1 (#0887)    77 Spitfire    71 Saab Sonett III
                        65 Rambler Classic

Morgan:    www.team.net/morgan
Bricklin:     www.bricklin.org

If you can read this             - Thank a teacher!
If you are reading it in English - Thank a Vet!!

 From Dennis Prager - The American Trilogy:
      e pluribus Unum, "from many, one."
      In God We Trust
      Liberty - the  power  of  choosing,  thinking,  and  acting  for
                   oneself; freedom  from  control  or  restriction




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<html>
<body>
<font size=3>At 07:09 PM 10/1/2020, lee@automate-it.com wrote:<br><br>
&gt;I want to operate two solid-state relays simultaneously (one for a
110V circuit,<br>
&gt;the other for 220V) from a single PID. I had thought I would just
wire them in <br>
&gt;parallel from the PID, but a bit of poking around the interwebs
suggests <br>
&gt;otherwise. So I sketched up this drawing for two SSRs in series with
a PID. Does <br>
&gt;this look correct for this situation? Any suggestions
appreciated!<br><br>
Lee,<br><br>
I don't know where you got the idea that putting them in parallel would
not work.<br>
Nor do I know if a PID is really the correct tool to use here.<br><br>
You don't really say what or why you are trying to control.<br><br>
In series, both solid state relays would have to close at the same time
to cause and both load would be energized.&nbsp; Not know what your are
trying to do, I'd <br>
think you'd want to be able to turn either one or off regardless of the
state of the<br>
other relay, which would require a seperate output line for each
ssr.<br><br>
You might be better off using one of the micro controllers like a
Raspberry pi controller,&nbsp; Arduino, or the BASIC stamp.<br><br>
John<br><br>
</font><div id="DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2">
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<br>
<div>John T. Blair&nbsp; WA4OHZ&nbsp;&nbsp;&nbsp;&nbsp; email:&nbsp;
jblair1948@cox.net</div>
<div>Va. Beach,
Va&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Phone:&nbsp; (757) 495-8229</div>
<br>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 48
TR1800&nbsp;&nbsp;&nbsp; 48 #4 Midget&nbsp;&nbsp;&nbsp; 65 Morgan 4/4
Series V (B1106)</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp; 75 Bricklin SV1 (#0887)&nbsp;&nbsp;&nbsp;
77 Spitfire&nbsp;&nbsp;&nbsp; 71 Saab Sonett III</div>
<div>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
65 Rambler Classic</div>
<br>
<div>Morgan:&nbsp;&nbsp;&nbsp;
<a href="http://www.team.net/morgan"; EUDORA=AUTOURL>
www.team.net/morgan</a></div>
<div>Bricklin:&nbsp;&nbsp;&nbsp;&nbsp;
<a href="http://www.bricklin.org/"; EUDORA=AUTOURL>www.bricklin.org</a>
</div>
<br>
<div>If you can read
this&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
- Thank a teacher!</div>
<div>If you are reading it in English - Thank a Vet!!</div>
<br>
<div> From Dennis Prager - The American Trilogy:</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp; e pluribus Unum, &quot;from many,
one.&quot;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp; In God We Trust</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp; Liberty - the&nbsp; power&nbsp; of&nbsp;
choosing,&nbsp; thinking,&nbsp; and&nbsp; acting&nbsp; for&nbsp; </div>
<div>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
oneself; freedom&nbsp; from&nbsp; control&nbsp; or&nbsp;
restriction&nbsp; </div>
<br>
<br>
</html>

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