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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:

enter image description here

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).

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It appears from the manual that the output is an SPST relay contact, but the rating of the contact is not stated.

I suggest you contact the manufacturer to cxonfirm the relay contact specifications, and to obtain output wiring recommendations..

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The controller data sheet indicates that there are three outputs. A voltage mode output, a current mode output and an on/off relay output via a SPST relay.

enter image description here

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  • \$\begingroup\$ The 16C-3 is the relay output version, but I can't make sense of the relay specs - need the contact voltage and currrent ratings. \$\endgroup\$ Dec 5 '16 at 19:19

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