I have been working on my control panel the last few weekends and am interested to know what you guys think. I still need a way to attach my Thermocouples and another piece of din rail.
You can use something like this for your thermocouples. Just buy the mini tc connectors
http://www.omega.com/pptst/UPJ.html
Yes it was tight next time one up on my box size.That looks great you get an (A). Now grasshopper, wire like the wind, (keep everything tight, because that is going to be a stuff job).
Looks awesome!
What are those four black components to the right next to the relays and breakers?
they are maniacal relays
Do the let out an evil click when they close?
Seriously...no heat syncs? I'm about to build similar
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Heat Sinks are there just cant see them.
What is the benefit of mechanical and SSR?
Spare PIDs too. Heat greatly reduces the lifespan of electrolytic capacitors (which are found in most electronic devices, including PIDs).Those heat sinks are going to get pretty hot in that enclosure. You might want to think about a fan and a vent. And have some spare SSR's handy.
16x16x8What size is the enclosure?
I have a 50 amp, 240 vac system. I run two 4500 watt elements in both my HLT and BK. My heat sinks are mounted to the back panel. Granted my heat sinks are bigger and my enclosure is bigger (20X16X8), but I have no ventilation system and my SSRs barely get warm. I have had the same Crydom (40 amp) SSRs for 8 years with no failures. I have replaced one Omega PID but I purchased it used. The size of the heat sink and enclosure will make a significant difference so my situation is not universally applicable. YMMV.
the mechanical relays are turned on and off manually by a switch in most cases..(I use a three way switch to prevent accidenatlly turning both elements on at once) . They are more a fail safe and also kill power to both hot legs of power to the element vs an ssr which only kills one half of the actual power going to the element. but because the srr kills one leg the circuit is not complete and the element turns off in normal use with the ssr.I have a question about the mech relays. If the SSR's control the mech relays, and the SSR's fail hot, then won't they just energize the mech relays when they fail?
The SSR dose not control the relay. Its just there the completely brake the circuit out to the element. Its on when the controller is on and off when the controller is off. Also I have a light that is on when the SSR is on if it fails on I will see the light stay on.
I was thinking of changing mine to that also. my contractors have a 120v coil.Edit nevermind I misread.
mine is wired similarly except I have it so the controller stays on so I can monitor temps.
I also used relays that are controlled by low voltage 24 volts DC in my case
I had a eureka moment (kinda) the other day when I f'ing around with soldering those tiny pins onto wires for the external probe connectors. I'm really annoyed I didn't think of it sooner - use RJ-45s. As an IT guy, I have all the crimps, terminators, sockets, everything Cat5. If I could undrill those holes ...
I had a eureka moment (kinda) the other day when I f'ing around with soldering those tiny pins onto wires for the external probe connectors. I'm really annoyed I didn't think of it sooner - use RJ-45s. As an IT guy, I have all the crimps, terminators, sockets, everything Cat5. If I could undrill those holes ...
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