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Setsumi's control box
Posted: Mon Mar 15, 2021 12:30 am
by Setsumi
So I finally got to electric. but in South Africa when our national grid is under strain the supplier shed users....
well it started with a microscope box, the microscopes were sold but the seller did not knew about the boxes.
and then a lot of stuff, mostly from online via china
look i have trouble posting pics. will update soon
Re: Setsumi's control box
Posted: Mon Mar 15, 2021 12:37 am
by Yummyrum
Awesome . You got the box .
LOL . Is that one of those Wooden Microscope Boxes . You got me interested . I found about a dozen of those under the Preproom at work recently . Was thinking about a use for them
Re: Setsumi's control box
Posted: Mon Mar 15, 2021 12:40 am
by Setsumi
Yummyrum wrote: ↑Mon Mar 15, 2021 12:37 am
Awesome . You got the box .
LOL . Is that one of those Wooden Microscope Boxes . You got me interested . I found about a dozen of those under the Preproom at work recently . Was thinking about a use for them
yup, i update my first post with images.
Re: Setsumi's control box
Posted: Mon Mar 15, 2021 12:46 am
by Setsumi
the box have 2 SCR controlles for stilling and a PID for brewing. each controller isisolated with a double pole 30A isolater. and couplers is 32A industrial.
the PID can be on while the outlet is isolated. the SCR on the right is not wired yet, it will be on its own line.
onboard i have an earth leakage and overload protection. wire is 4mm. it will drive a 4Kw element.
Re: Setsumi's control box
Posted: Wed Mar 17, 2021 9:01 pm
by Setsumi
what bothers me is my Amp/Volt meter readings drop as soon as i switch the SCR on. the volts will read 220V before load but as soon as the heater recieves current the volts drop and the amps read low for the heater rating.
the volt meter is connected before the SCR the CT is after the SCR.
is it resistance from the heater or cheap meter?
Re: Setsumi's control box
Posted: Wed Mar 17, 2021 9:21 pm
by Yummyrum
How much is it dropping by ? 10-20 volts ?
This may be because you are getting a voltage drop along the cabling from the fuse box
Re: Setsumi's control box
Posted: Wed Mar 17, 2021 9:36 pm
by Setsumi
Yummyrum wrote: ↑Wed Mar 17, 2021 9:21 pm
How much is it dropping by ? 10-20 volts ?
This may be because you are getting a voltage drop along the cabling from the fuse box
it drops between 5 and 8 volts. althoug i am about 15m away from my distribution box the line running to my shed is part a 10mm line and then i tap into that with 4mm line.
i see the same drop if i use the SCR on my coffee kettle inside the house.
last, i use prepaid electricity. i wonder if the utillity service maybe throttle?
Re: Setsumi's control box
Posted: Thu Mar 18, 2021 2:56 am
by Yummyrum
I said fuse box as I was in a hurry , but yeah , its the whole distribution cable to basically your nearest distribution transformer .
Every house has some drop .
The higher the load we use the higher will be the drop and seeing we are using quite large loads ... in excess of 2400w or more , what you are seeing 5-8V drop , is fairly typical .
If you plugged say a 100w light globe ( instead if your element ) , you will find the voltage will drop barely a volt .
Re: Setsumi's control box
Posted: Thu Mar 18, 2021 3:25 am
by Setsumi
Yummyrum wrote: ↑Thu Mar 18, 2021 2:56 am
I said fuse box as I was in a hurry , but yeah , its the whole distribution cable to basically your nearest distribution transformer .
Every house has some drop .
The higher the load we use the higher will be the drop and seeing we are using quite large loads ... in excess of 2400w or more , what you are seeing 5-8V drop , is fairly typical .
If you plugged say a 100w light globe ( instead if your element ) , you will find the voltage will drop barely a volt .
thanx, it helps to know.
Re: Setsumi's control box
Posted: Thu Mar 18, 2021 8:55 am
by Demy
Good job!
Re: Setsumi's control box
Posted: Thu Mar 18, 2021 9:28 am
by Setsumi
Demy wrote: ↑Thu Mar 18, 2021 8:55 amGood job!
thanx