home improvement turns into science fair projects?

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mediatechnology
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Re: home improvement turns into science fair projects?

Post by mediatechnology » Thu Feb 20, 2020 4:25 pm

JR. wrote:
Thu Feb 13, 2020 1:01 pm
mediatechnology wrote:
Thu Feb 13, 2020 12:53 pm
I don't know if the switcher blob is galvanically-isolated or not.
I doubt it.

The audio "silent switcher" has a ground connection from USB input to bipolar output.

Does the USB 5V outlet on the wall plate have a connection to safety ground?
I don't know but it would be easy to check.
UL woud probably like a safety ground bond, my experience with random house/outlet wiring suggests double insulated could be safer in practice.

JR
From Leviton:
Thank you for contacting Leviton tech support. The USB/DC ground is isolated from the AC ground (strap). The dielectric barrier between AC ground (strap) and USB/DC ground is tested per UL standard (1310). (emphasis added.)
I think I like it floating since it is more transformer-wall-wart-like.
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JR.
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Re: home improvement turns into science fair projects?

Post by JR. » Thu Feb 20, 2020 6:53 pm

yup 1310 is apparently the UL standard for class 2 double insulated, 2 wire skus...

JR
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Re: home improvement turns into science fair projects?

Post by JR. » Fri Feb 21, 2020 11:30 am

Sump pump only ran 15-20 minutes this AM so ground water is subsiding a little.

I was little worried when I upgraded to 1/2 HP from previous 1/4 HP sump. I had noticed that with the former 1/4HP sump the extension cord got a little warm, not enough to be a concern but evidence of the current draw.... I expected logically that the new 2x larger pump would draw more current and cause more heating. In a pleasant surprise if anything the cord is subjectively cooler... I will speculate that the new motor is more efficient, I don't think I have specs for the old sump pump that was purchased a few decades ago. 8-)

JR
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Re: home improvement turns into science fair projects?

Post by JR. » Sat Feb 22, 2020 5:27 pm

In no great surprise, the old sump pump that still worked has a readable power plate calling for 9A. Thus the warm extension cord... New pump despite 2x HP does not seem as current hungry.

[edit- while I wasn't paying attention it looks like they started rating motors by HP not current... my old 1/4 HP motor calls out 9A, the new 1/2 HP motor only specs HP, but if I look up current draw for 1/2 HP I get a similar 9A, so 2x power for same current as old school... got to love technology /edit]

I am resisting my inclination to redesign the second water level switch, before it arrives... somebody stop me.. :lol:

Multiple technologies that look interesting, bouncing ultrasonics signals off the water level, laser distance meter, and perhaps capacitance detection. My old idea of sensing the line cord draw still sounds good for safety shut off... But first things first, lets see how the new level switch looks, due in next week.

JR
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Re: home improvement turns into science fair projects?

Post by JR. » Mon Feb 24, 2020 5:35 pm

IMG_20200224_151248447.jpg
I finally have reliable (I hope) cybernetic control of my crawl space sump pump... The tethered level switch (that sucks) is cable tied up at attention so hard on... The add on smart level switch is attached to the side of the pump by the discharge outlet... I put some coarse netting (like onions come in from the store, actually exactly what my onions came in) around the bottom intake port to keep sticks and small animals out.

I put the pump into the hole without the bait bucket, and it fit a little better but hole could still stand to be a little deeper.

It appears that I now have smart turn-on, and better yet smart turn-off... 8-)

Good progress.. It seemed to short cycle a few times after the first draw down but that may just be the nature of my sub-surface water flow... It's raining right now, so mo water coming. :lol:

JR
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Re: home improvement turns into science fair projects?

Post by JR. » Tue Feb 25, 2020 4:18 pm

well that didn't take long... didn't turn on when water level hit the low float today.

The common customer complaint is that the controller fails stuck on and burns up the pump motors...

For now I am manually switching it again... :oops:

I may wait until next weekend to pull it out and troubleshoot... but might investigate this sooner.

My idea to sense current draw sounds better and better... :lol:

JR
Don't only half-ass tune your drums. Visit https://circularscience.com to hear what properly "cleared" drums sound like.

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Re: home improvement turns into science fair projects?

Post by mediatechnology » Wed Feb 26, 2020 8:11 am

I remember a stove vent hood design that used motor current to detect a blocked filter.

Do you have any current measurements of it running dry vs wet?
I realize that it may not have stopped raining enough for you to measure that in situ.
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Re: home improvement turns into science fair projects?

Post by JR. » Wed Feb 26, 2020 9:49 am

My original current sense split core transformer saturated at 5A and my pump is rated for 9A at max load. I have since found some 100A transformer/sensors. The typical form factor is 1000:1 step down. 9A max draw should generate 9mA output, that seems workable.
Image
Image
another is 50mA output @ 100A.

I am resisting the temptation to make this microprocessor controlled, manually turned on with automatic turn off seems reasonable.. an alternate is to generate a several hour delay so it can test for presence of water to pump, while active. With a smart micro control I could adaptively set the interval for sampling based on results.
===

Of course I still need to drag the sump pump out of my crawl space and determine why it stopped switching...in case it is something obvious and simple. The newer high output pump only took about 10 minutes to clear this morning's accumulation of crawl space water. It is not as loud as my old pump when pulling air, but I can hear it from inside the house if I stand directly above where it is operating.

JR
Don't only half-ass tune your drums. Visit https://circularscience.com to hear what properly "cleared" drums sound like.

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Re: home improvement turns into science fair projects?

Post by terkio » Wed Feb 26, 2020 11:02 am

JR. wrote:
Wed Feb 26, 2020 9:49 am
It is not as loud as my old pump when pulling air.....
JR
Hey.
What about detection based on loudness, sound ?

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Re: home improvement turns into science fair projects?

Post by JR. » Wed Feb 26, 2020 11:54 am

terkio wrote:
Wed Feb 26, 2020 11:02 am
JR. wrote:
Wed Feb 26, 2020 9:49 am
It is not as loud as my old pump when pulling air.....
JR
Hey.
What about detection based on loudness, sound ?
In my judgement that would be unreliable... my old sump pump made a racket when it pulled air, because it was sitting in a plastic bait bucket that apparently made it louder... the new pump is much quieter and I have to really listen hard, by standing in my bathroom to even hear it. The old pump was clearly audible in my main room even with the TV playing loud.

Now I am only hearing it intermittently pulling some water, so if it was completely dry, it would be even quieter.
==
I am about ready to pull it out and test it in a plastic garbage can as soon as it stops raining.

JR
Don't only half-ass tune your drums. Visit https://circularscience.com to hear what properly "cleared" drums sound like.

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