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starter
26/04/2019 at 06:40
0

Solved!

It turns out the controllers I have (RTC Rex-C700 and a TEL 72-8001B) do not have low voltage outputs.  Instead, there is an internal relay that just opens and closes according to the temperature.  I confirmed this by testing resistance and the controllers open and close the circuit at the output contacts.

The internal relays (3A) are not able to handle the heating elements.  Looks like I will have to step down voltage and invert to DC somehow to run a line through the internal relay to the SSR. Maybe it is time to take apart a USB phone charger!

Thanks for your help

starter
24/04/2019 at 07:04
0

I believe so. 5 and 6 should be low voltage based on the bulb that lit at the store when I bought it but I dont have a user manual (bought it on the street in Yangon). The relay function comes from the 40A SSR which is separate from the PID controller. Yes, when I disconnect from 5 and 6, the 5 and 6 leads still read 0V on the multimeter, despite the PID indicator light being on and SV above PV.

My first PID controller was a different model but had the same issue when I first connected everything.

starter
24/04/2019 at 04:15
0

Hi I am having similar problems. Can you provide more detail on how you solved?

I have tried two PID controllers. Both turn on and register temperature changes when I hold a flame to the thermocouple. Both click on when the set temp exceeds the present temp. However, neither provides any voltage to the SSR leads (measured with a multimeter set at 20V DC). For the second PID I confirmed it could turn on a light bulb from the SSR leads before I left the store. But when I got home, I can no longer light an LED or detect voltage. I confirmed the SSR will turn on when I connect it to a 9V battery and it will activate the heating element.

Could I be connecting it wrong? Could it be that my main voltage is 180V (rural Myanmar) but the PID controller is rated for 220V? Any ideas are appreciated.

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starter
26/11/2018 at 03:07
0

Maybe you could mix in some fibers to the melt to boost the tensile strength?

In reply to: EcoSan for the Kamp

starter
25/11/2018 at 13:54
1

Yes to Urine reuse!  I piloted a urine based hydroponics in the past w some success (aquoponics for vegetarians : )  and would be interested in pushing the envelope to a larger size.  All nutrients came from urine w the exception of a little iron to supplement. My work is up on the StemNode wiki.  Anyone else is able to contribute. http://wiki.stemnode.org/index.php/Fertilizer_from_Urine

Around 80% of nitrogen, phosphorus, and potassium consumed by people is excreted in urine while almost none of the pathogens excreted are in urine. Urine separation also helps anaerobic digestion of feces to biogas because the methane producers are sensitive to the ammonia from urine.  It’s integrates well into a lot of  waste management strategies.

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starter
25/11/2018 at 07:08
1

Hi, I am part of a team developing a wiki which may be a good fit.  It is systems focused wiki for those that want to see the bigger picture of any system alongside the small parts.

There are two sides to the systems wiki; The first side is a traditional wiki (media wiki with some add ons like video embedding and author tracking), and the second side lets you map systems of systems with each system linking to a wiki.  For example a precious plastics workshop is a system with the subsystems being plastic collection, plastic sorting, shredding, injection molding, extrusion, compression oven, and plastic selling. Each of these has it’s own subsystems;  a compression oven has controls, the oven, and the compression system. With our systems wiki you can insert a system into multiple larger systems; for example a PID controller can be inserted into the compression oven and extrusion machine and when knowledge on one is updated, it stays updated in both of them.

We would be excited to have members of the precious plastics community (or Project Kamp) try it out and give us feedback.  If you are willing to deal with some bugs and give constructive feedback we would will try and improve it to meet your needs.  Our beta site is at stemnode.org and wiki.stemnode.org.  It is best if we video chat for 10 minutes and I can give you an introduction to the website so message me and we can exchange info.

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