SoliForum - 3D Printing Community — Wrong PID?

Re: Wrong PID?

null@example.com (earlye) — Sun, 12 Mar 2017 23:30:30 +0000

Thanks for taking the time to explain how it works in detail for me. This kind of support is above & beyond the call of duty, and very much appreciated! Armed with this knowledge, I feel confident to continue working on it.

Seriously, thank you very much.

Re: Wrong PID?

null@example.com (elmoret) — Sun, 12 Mar 2017 19:47:56 +0000

The heater needs power applied in order to produce heat. Positive flows from the power supply to terminal 9, then through the jumper to terminal 8, then into the controller and through the controller's relay, then out terminal 7 when the controller calls for heat, then through the heater, then back to terminal 10 (which is negative, or ground).

The reason for the jumper is the same power is being used for the heater as for the PID controller. It is possible for the PID controller to be powered by one power source and the load to be powered by another power source. For example if you were using the PID controller to control an air conditioning unit.

Re: Wrong PID?

null@example.com (earlye) — Sun, 12 Mar 2017 15:44:51 +0000

Again, sorry for the newbish questions - first time PID user, just trying to understand how everything works.

Re: Wrong PID?

null@example.com (earlye) — Sun, 12 Mar 2017 15:43:51 +0000

Ah - I see where I was misunderstanding. I tend to think of ground as not the same thing as power, but that does make sense.

So is my interpretation correct, that the 9 -> 8 jump is so that the positive side can be connected by the controller to 7?

Re: Wrong PID?

null@example.com (elmoret) — Sun, 12 Mar 2017 14:11:12 +0000

Pins 9 and 10 are used for powering the PID on the Filastruder diagram as well. If you trace the lines on the wiring diagram, pin 9 connects to positive of the power supply and pin 10 connects to negative of the power supply.

Re: Wrong PID?

null@example.com (earlye) — Sun, 12 Mar 2017 13:17:37 +0000

That sounds good, except that Pin 9 & 10 are shown as power in on the PID, but the wiring diagram says to use pins 8 & 9 for that, and 10 for ground.

Or is the diagram on the PID saying that 9 is 12V, 10 is 0V, and we're jumping 9 to 8 because the PID will jump 8 -> 7 when it decides to turn on the heat?

Sorry to doubt, but I'd like to understand what's going on. Not a EE, so I'm probably a bit slow on the uptake.

Re: Wrong PID?

null@example.com (elmoret) — Sun, 12 Mar 2017 02:42:31 +0000

Stick to the wiring diagram in the Filastruder instructions. The PID controller can control many things so the label on the PID itself doesn't specify a heater.

Re: Wrong PID?

null@example.com (earlye) — Sun, 12 Mar 2017 00:03:11 +0000

Or, I would upload both, if the forum was working. Keep getting 404

EDIT: figured that out. The "Upload Image" button on replies does not work at all. I had to go back and edit my original post to add the second attachment.

Wrong PID?

null@example.com (earlye) — Sun, 12 Mar 2017 00:01:09 +0000

The instructions I downloaded shows power going to pin 9, with a jumper to 8, and pin 7 going to the heater, then to pin 10, then to ground from there.

The diagram on the PID shows pins 9 and 10 being for power, 3 and 4 for the thermocouple, and it's not clear from that diagram where the heater should go.

Attaching pictures of both.