Originally Posted by movet22
does the white light turn on to signify that the element is indeed being used by the PID at the moment? (And thus not illuminated when the temp has been set and the element need not be running?)
Disclaimer: I'm just describing what I see in the schematic, linked above. I don't have this control panel (I built my own several years ago).
The white LED indicates that the element is actually getting power. So, yes to your question. But consider this scenario: you've selected Element #1 with the selector switch; PID #2
is set to 200F. What happens with the LEDs (yellow, white) for Element #2
? Do they indicated what PID #2 is doing?
The answer is that PID #2 doesn't have any idea that Element #2 cannot get power. PID #2 will continue to drive SSR #2 in order to turn on Element #2, but Contactor #2 is disabled. Thus, neither the yellow or white LEDs for #2 every come on, even though the PID #2 is happily doing it's job
You can't really figure any of this out if you don't understand the schematic.