switch from fuses to circuit breaker machine heat circuit

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ptonsparky said:
I was going to post a picture of a house we were in that had a fan blowing on the panel. Totally open with no door.
(Can't find it.)
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I did that once to test a load bank. I needed more current than the panel board could supply so I put a fan on it. Nothing tripped. I have been known to put fans on transformers for the same reason. If I can get the test done without smoke coming out of the transformer that's a good thing.
 
there are fans on the control cabinets but not necessarily blowing directly on them
I don't think there is enough room to separate them. but i will look if i can move something around to try that and maybe add another fan directly at them
 
With a diagram like this, it's obviously wired this way on purpose. Are KS2-4 and -5 separately switched for, say, low-medium-high settings?

1695237360767.jpeg
 
Ks2-4 and ks2-5 are labeled as ssr. I take that to mean they are solid state relays likely controlled by some kind of temp controller.
 
the SSR's are solid state relays and controlled by the plc/heat controller heat monitored by a thermocouple the SSR's Ks2-4 and ks2-5 are switched on and off at the same time always. there is NO low ,med, high setting we can adjust the temp 1 degree at a time through the PLC. there are 9 heat zones in a row on a long barrel to precisely melt plastic on an injection molding machine
 
Well redesign everything and go back to my suggestion but you will need to add another SSR.
lew5679 said:
the SSR's are solid state relays and controlled by the plc/heat controller heat monitored by a thermocouple the SSR's Ks2-4 and ks2-5 are switched on and off at the same time always. there is NO low ,med, high setting we can adjust the temp 1 degree at a time through the PLC. there are 9 heat zones in a row on a long barrel to precisely melt plastic on an injection molding machine
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A single 3 pole 25 or 30 amp CB would work but then you need to consider the ambient for that trip curve.

Do some thermal imaging. Replace parts and torque all connections.
 
lew5679 said:
the SSR's are solid state relays and controlled by the plc/heat controller heat monitored by a thermocouple the SSR's Ks2-4 and ks2-5 are switched on and off at the same time always. there is NO low ,med, high setting we can adjust the temp 1 degree at a time through the PLC. there are 9 heat zones in a row on a long barrel to precisely melt plastic on an injection molding machine
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In that case, you can redistribute the heaters for better balance by moving one wire.

You have three heaters between A and C, two between B and C, and none between A and B.

I'm suggesting moving, for example, E-27's #2 to E-28's #1, electrically speaking.

As you have now, control only requires breaking two of the three lines, not all three.
 
LarryFine said:
In that case, you can redistribute the heaters for better balance by moving one wire.

You have three heaters between A and C, two between B and C, and none between A and B.

I'm suggesting moving, for example, E-27's #2 to E-28's #1, electrically speaking.

As you have now, control only requires breaking two of the three lines, not all three.
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That took a minute of thinking. Yes, should work well.
 
excellent i will test out on one machine that gives us the most problems then change all the other ones over after proven to be successful
thanks for all your help I apricate the help and all your professionalism
 
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