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Author Topic: Power Supply Unit  (Read 43646 times)

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Offline Hood

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Re: Power Supply Unit
« Reply #110 on: January 19, 2011, 12:14:08 PM »
Still I would like to know: Do I need any ventilation holes on the metal enclosures?

What size wiring from the rectifier to the capacitors?


Yes, ventilation would be needed, whether its holes or slots or just a bit cut out maybe with gauze covering to stop fingers getting in.

Dont know anything about your wiring sizes in the USA, here we are mm2 but whatever the USA gauge is that can handle your current plus a bit extra should be fine.

Hood

Offline kolias

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Re: Power Supply Unit
« Reply #111 on: January 19, 2011, 12:39:42 PM »
So I will make sure that there is at least 1" clear between the top of the bolt and the case
Nicolas

Offline kolias

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Re: Power Supply Unit
« Reply #112 on: January 19, 2011, 02:51:28 PM »
Still I would like to know: Do I need any ventilation holes on the metal enclosures?

What size wiring from the rectifier to the capacitors?


Yes, ventilation would be needed, whether its holes or slots or just a bit cut out maybe with gauze covering to stop fingers getting in.

Dont know anything about your wiring sizes in the USA, here we are mm2 but whatever the USA gauge is that can handle your current plus a bit extra should be fine.

Hood


So I got the ventilation question answered, thanks Hood

The 2mm translates to 12 or 14AWG here if I'm right which I find it kind of heavy

Hopefully someone can let me know the wiring size from the rectifier to the capacitors and then I will feel more confident
Nicolas

Offline Hood

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Re: Power Supply Unit
« Reply #113 on: January 19, 2011, 03:02:37 PM »
I was meaning mm² (cross sectional area) not 2mm wire.

Looks like you still cant Google ;D

http://www.geocities.com/CapeCanaveral/Lab/9643/MIL_STD_975_wire.htm

Hood

Offline Hood

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Re: Power Supply Unit
« Reply #114 on: January 19, 2011, 03:10:06 PM »

Offline kolias

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Re: Power Supply Unit
« Reply #115 on: January 19, 2011, 03:40:35 PM »
So it is 14AWG, thanks
Nicolas

Offline kolias

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Re: Power Supply Unit
« Reply #116 on: January 20, 2011, 07:27:57 AM »
I just noticed that the power supply I have ordered from China it is called “Switching Regulated Power Supply”

I wonder what the difference with the one I will build is. Any pros / cons between the two?
Nicolas

Offline stirling

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Re: Power Supply Unit
« Reply #117 on: January 20, 2011, 09:05:42 AM »
Well remember that doc I linked to back in post #86 - the stepper basics guide from geckodrive? Here's a quote from page 11.

"The drive works best with unregulated power supplies though regulated linear and switching
power supplies may also be used. What matters is the power supply must have a large output
capacitor and an unregulated supply intrinsically has one.
If a linear regulated or a switching supply is to be used, then a large capacitor should be placed
across the output terminals. A 2,000 to 10,000 uF capacitor should do."

However, I note that this has apparantly been dropped from the latest version of this doc http://www.geckodrive.com/support.aspx?q=10005#Power%20Supplies

Make of that what you will

Ian

Offline kolias

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Re: Power Supply Unit
« Reply #118 on: January 20, 2011, 09:32:38 AM »
Thank you for your time Ian, so much to absorb in such a sort time
Nicolas

Offline kolias

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Re: Power Supply Unit
« Reply #119 on: January 20, 2011, 03:15:25 PM »
I have ordered the rectifier but have a hell of the time to get the transformer due to high cost

Parts-express.com they have a toroidal for $53.48 + $44.82 shipping
The Antek which Ray.L suggested is $90.00 + $26.00 shipping
Plitron who are in Canada have also one for $107.65 but minimum order is $250.00 !!!!

So the best deal I guess is the one which Gerry suggested (picture attached) from mpja.com at $18.95 + shipping by UPS + brokers and custom fees which I estimate them to be $50.00 to $70.00

My question is why the transformer on the attached picture is so inexpensive and the toroidal seems so expensive. Are they so different?

And the transformer on the attached picture what kind it is? I would like to search other sites to see if I can find one which they will ship to Canada by regular post.

Never thought that it will be so difficult to get the parts for this project
Nicolas