Dual-500 king of the Castle

[grapplesaw]

One cap done second on machine.
Takes a few hours to do each one properly

 

[grapplesaw]

We have successfully conditioned the power caps. They are installe. A little wiring to tidy up then start putting the power to it tomorrow

 

[laatsch55]

Give em hell Glen..

 

[J!m]

I like those red battery terminal covers. Really drives home the point: "this will kill you".

Approved.

 

[FredR]

Beautiful work!

 

[FredR]

Acetone is a chemical used to make products like nail polish remover and paint remover. Your body also makes this chemical when it breaks down fat. Acetone is safe in normal amounts, but too much of it could be a problem.


Does that help you any Glen??

It does explain this strange nervous tick I have.

 

[laatsch55]

LOL!!!!!!!!!!!!!!!!

 

[grapplesaw]

Yes you can call it extreme
all set to drive the outputs. Power supply and control board all fired up through the dim bulb.

 

[laatsch55]

I think you need more DMM's Glen....

 

[laatsch55]

Damn dude...you own stock in Keithly??

 

[grapplesaw]

Damn dude...you own stock in Keithly??

No. These are older unit made in the USA. They are good quality at a good price
If see them on eBay for $40 or so I buy them. The 51/2 one I got around $80 each.

 

[grapplesaw]

I think you need more DMM's Glen....

You need four and more is better

 

[grapplesaw]

I think you need more DMM's Glen....

And like I need two AP’s as well. It’s a disease that you know all to well

 

[laatsch55]

Yes I do Glen...if I had more room..

 

[grapplesaw]

Fully powered both channels. All good but!
I have stopped to figure best solution for a problem I created. Having added separate power supply for constant voltage to the control board I have eliminated any built in power drain from the main caps. In other words they do not discharg. I need to add a resistor that will drain the Cap’s say over a couple of minutes but not effect overall performance of the power supply. We have 35,000 uf at 240 volt.

Anyone got a calculation for what may be best would be a help

 

[grapplesaw]

Having looked for a calculator I found this site.
look like 10,000 ohms may take 5 to 6 minutes for full discharge.

now I got to refresh myself on Microcoulombs

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/capdis.html#c2

 

[grapplesaw]

So set up test on low rail voltage of 160 volts.
used a 10k 2 watt resistor. About 6 minutes down to 15 volts. The resistor got up to 1’80* F under power

then two in series 104* F with 160v rail. About 10-12 minutes to discharge

retested using two 220 k 2 watt in parallel
Only 80* F but may take 1 hour to discharge

 

[grapplesaw]

Actually, this sounds like a reasonable solution -- especially if you have a sign (on the inside of the top cover / or even on top of the top cover, 'Fear This' style ) to tell anyone going in something to the effect that "Please wait 6+ minutes for lethal voltages to dissipate BEFORE proceeding."

(Preferably in stencil font -- always catches my eye/makes me stop & read for comprehension...must be my military background. :0)

This way you've more than covered the bases, safety-wise. Anyone who puts themselves within touching distance of coke can-sized caps should know that they are at risk, and should be discharging B4 proceeding...

Yes it matches the service manual. I may look for a relay to fast discharge on powerr off.