My PID controller LOVE 16C-3 has a output of "relay".
Do I connect the output of the PID controller to the inputs of an external SSR?
Or is the relay already built in into the PID controller?
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The relay output is SPST rated at 5A:
You cannot use this output to directly control a typical DC-input SSR without an external DC power supply of some type. It's just a normally-open contact.
You should not switch anything like 5A with it either, unless you want it to last a very short time. Typically life at full rated current is only perhaps 100,000 operations, which might be weeks or months 24/7.
They should repeat the datasheet specs within the manual, but I imagine this is just some rebranded no-name Asian product anyway. I doubt Love makes this kind of control these days (they did, many years ago).