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Help with Powder Coating Oven

Notch1988

Well-known member
Joined
Feb 20, 2006
Messages
527
Location
Fort Saskatchewan, AB, Canada
I'm having issues with my oven not working. I built the oven a couple years ago and it worked great until I moved and the oven took a 300 mile ride. Now I can't get the elements to warm up.

I've attached some pictures including the wire schematic. I've replaced the solid state relay (upgraded model) but the old one bench tested fine. I replaced the element indicator lamp as the old one wasn't lighting up but the new one doesn't light either.

The trouble shooting I've done:
The elements both ohm out to 22.3 ohms and are not grounding out so I'm assuming they are good.
The fan and lights both work
When I switch on the elements the relay has a light that indicates it is cycling on and off but the elements do not heat up nor does the indicator lamp light.
Now the weird stuff...
I'm getting 115V at each side of the elements at all times, whether the switch is on or off.
I'm getting 115V at both sides of the indicator lamp at all times.
I'm getting 115V at both legs of the plug that leads to the element, this is post relay.

I don't know if the SSR has some leakage but the indicator lamp only needs 20mA to light so since I'm reading voltage I don't understand what's going on.

As I stated above, the oven worked perfectly for two years as is and I've found no reason as to why it isn't working now. Any ideas on what to trouble shoot next would be appreciated.
 

Attachments

  • Oven Controls.jpg
    Oven Controls.jpg
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  • Oven Wiring01.jpg
    Oven Wiring01.jpg
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  • Oven Wiring02.jpg
    Oven Wiring02.jpg
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  • Element Test.jpg
    Element Test.jpg
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  • Schematic01.jpg
    Schematic01.jpg
    73.5 KB · Views: 56
  • Schematic02.jpg
    Schematic02.jpg
    78.9 KB · Views: 40
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wyliesdiesels

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Joined
Aug 14, 2012
Messages
20,257
Location
Modesto, CA
If the elements are 240v then you should be getting 240v not 120v.

how are you testing the voltage at the elements? Line to neutral or ground? If so then you should be testing line to line.

I would start by testing the voltage at the outlet on the wall, making sure you have 240v, then test line voltage at the elements.
 

BukitCase

Well-known member
Joined
Apr 11, 2017
Messages
1,075
Location
Oregon
Get a simple "outlet tester" and plug it into the receptacle you're using - this sounds to me like reversed wiring to the outlet. BTDT... Steve

Oops, my bad; hadn't looked at the schematic before I posted, sorry...
 

wyliesdiesels

Well-known member
Joined
Aug 14, 2012
Messages
20,257
Location
Modesto, CA
Get a simple "outlet tester" and plug it into the receptacle you're using - this sounds to me like reversed wiring to the outlet. BTDT... Steve

Oops, my bad; hadn't looked at the schematic before I posted, sorry...

youre not gonna find a "simple outlet tester" for a 120v/240v 14-30r outlet.
 
OP
N

Notch1988

Well-known member
Joined
Feb 20, 2006
Messages
527
Location
Fort Saskatchewan, AB, Canada
If the elements are 240v then you should be getting 240v not 120v.

how are you testing the voltage at the elements? Line to neutral or ground? If so then you should be testing line to line.

I would start by testing the voltage at the outlet on the wall, making sure you have 240v, then test line voltage at the elements.

Thanks Wylie, that was my problem. I was only checking line to neutral or ground on both the oven and wall outlet. My Dad had wired 3 circuits/outlets for the compressor, welder and oven and everything worked except the oven so I thought nothing of it on the panel side. However, the Stablok panel needs you to straddle the breakers to grab both buses which was not done on the oven breaker. Moved the breaker down one spot and everything works as it should now!
 
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wyliesdiesels

Well-known member
Joined
Aug 14, 2012
Messages
20,257
Location
Modesto, CA
Thanks Wylie, that was my problem. I was only checking line to neutral or ground on both the oven and wall outlet. My Dad had wired 3 circuits/outlets for the compressor, welder and oven and everything worked except the oven so I thought nothing of it on the panel side. However, the Stablok panel needs you to straddle the breakers to grab both buses which was not done on the oven breaker. Moved the breaker down one spot and everything works as it should now!

what is the HP rating on the compressor?

And i highly suggest replacing that FPE stablock panel. Its a fire hazard... :FIREdevil :shocking:
 
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