Electronics > Projects, Designs, and Technical Stuff
I fried my SSR........ HELP!!!
jwilson:
Also, the lines drawn on the kiln represent the two leads for each element. 8 pairs, 4 leads total.
jwilson:
Is this a suitable relay?
https://www.automationdirect.com/adc/shopping/catalog/relays_-z-_timers/solid_state_relays/panel_mount_relays,_hockey_puck_style,10a_-_75a_(ad-ssr6_series)/ad-ssr640-ac-480a?gclid=CjwKCAiA66_xBRBhEiwAhrMuLYSIR0jvmlq4Jov-z3gH_w68Pn-nENwTheYSLJqrflV9q_HEu2M5WRoCIPUQAvD_BwE
floobydust:
Paragon kiln model A82 wiring, the manufacturer states "Neutral is essential" :-// so I'm wondering about the power cord missing that. It should have 4-prongs.
So I updated the wiring diagram to match the manufacturer's wiring - having the heater's top mid-point connected to neutral.
If you wired all four heaters in parallel it would overload the SSR's. They are wired in pairs.
The Kiln companies are using mechanical contactors, I couldn't see any SSR's likely because they do make a lot of heat.
I'm worried about how hot this enclosure gets sitting on the side of the kiln. You need high-temp wire.
The Automation Direct SSR is the wrong one, it wants 90-280VAC input but the PID controller's output is 12VDC to the SSR's. AD-SSR6T40-DC-480A looked right.
edit: forgot
Check your thermocouple polarity with a magnet, the more magnetic (iron) wire is (+). Red is almost always (-) it's counterintuitive.
Also make sure the one you have can take the heat- kilns get really hot. Type-J is good to only 750°C and would burn out. Kilns are usually type-K 1300°C/2372°F max. It should be yellow/red (K), not a white/red wire (J) like you have.
jwilson:
--- Quote from: floobydust on January 25, 2020, 10:35:57 pm ---Paragon kiln model A82 wiring, the manufacturer states "Neutral is essential" :-// so I'm wondering about the power cord missing that. It should have 4-prongs.
So I updated the wiring diagram to match the manufacturer's wiring - having the heater's top mid-point connected to neutral.
If you wired all four heaters in parallel it would overload the SSR's. They are wired in pairs.
The Kiln companies are using mechanical contactors, I couldn't see any SSR's likely because they do make a lot of heat.
I'm worried about how hot this enclosure gets sitting on the side of the kiln. You need high-temp wire.
The Automation Direct SSR is the wrong one, it wants 90-280VAC input but the PID controller's output is 12VDC to the SSR's. AD-SSR6T40-DC-480A looked right.
edit: forgot
Check your thermocouple polarity with a magnet, the more magnetic (iron) wire is (+). Red is almost always (-) it's counterintuitive.
Also make sure the one you have can take the heat- kilns get really hot. Type-J is good to only 750°C and would burn out. Kilns are usually type-K 1300°C/2372°F max. It should be yellow/red (K), not a white/red wire (J) like you have.
--- End quote ---
You're amazing and I can't thank you enough for all your help!!!
You just potentially saved a house fire :-DD
My 240 volt outlet only has 3 prongs. It sounds like I need to replace it to a 4 prong/wire receptacle.
Also, thanks for the update on the SSR. I will pickup a couple of the model you recommended.
I am using a type K thermocouple. That's probably the only part I got right about all of this!
Thank you again for all your help!!!
Nusa:
"Neutral is essential" makes sense. The likely original configuration with two 4-way rotary switches was manual operation with OFF/LOW/MED/HIGH. As I understand it, LOW turned on one element at 120V. MED turned on both elements at 120V, and HIGH put them in parallel at 240V. And the other rotary switch controlled the other two elements in the other heating zone. If you've still got the original switches, you could confirm how they operate if you wanted.
You may discover that you actually need two zone control to get even heat, especially if you have longer blades to temper. But if you get this working, that should be an easy upgrade.
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