[Shop-talk] Two SSRs from one PID controller

[Donald H Locker]

More than likely, you should connect the PID controller's outputs to the
SSRs in parallel - each SSR '+' terminal connected to the controller's
'+' output and each SSR '-' terminal connected to the controller's '-'
terminal.

SSRs typically have LED input stages and the likelihood of both SSRs
requiring the same current at half the voltage that the PID controller
can provide is slim. More likely, both SSRs require some minimum
voltage; the PID controller should be able to provide that voltage while
still providing the current to both SSRs.

If you can tell us the PID controller's and the SSRs manufacturer/model
info, we can probably help more.

Donald.
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On 2020-10-01 7:09 p.m., 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!
> 
> (I'm a chemist, so I understand electron flow and related, but I trust
> this little Shop Talk community more than I trust my electrical intuition!)
> Thanks!!!
>  Lee
> 
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