[Shop-talk] Two SSRs from one PID controller

[John T. Blair]

At 07:09 PM 10/1/2020, lee at 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 at cox.net
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