[Shop-talk] Two SSRs from one PID controller

[neiljsherry at talktalk.net]

Is there an option to use the pid  to switch one SSR (say the 110v one) and then switch the 220v from the 110v output with a conventional relay (or step back down to 20v and use the SSR).

On 2 October 2020 05:11:53 BST, lee at automate-it.com wrote:
>Ok sorry, yes, I should have included the power details:
>
>  - The PID (Inkbird ITC-106VH) provides 12 VDC, up to 30mA to the SSR.
>  - The SSRs (Inkbird SSR-40 DA) activate at 3 VDC (specs are 3-32 VDC)
>
>Lee
>
>
>On 2020-10-01 18:16, John Innis wrote:
>> We need a little more info.  What is your PID output rated at (volts,
>> amps).  What are your SSR input requirements (volts amps).  Are you
>> doing true proportional or a bang/bang approximation?
>> 
>> On Thu, Oct 1, 2020 at 6:10 PM <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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