220 to 110

[jamfixer]

trying to get 120 v ac to power a computer through a battery backup unit from a 220 v ac powered machine

when i take 1 leg of the 220 and nutural ( ground) it all works fine

but i am thinking where is the ground

when i use a transformer 220 to 110 the battery backup unit displays a ground fault?

can any one tell me if I am i missing the boat
thanks
br

[DaveDoesIT]

Originally Posted by jamfixer when i take 1 leg of the 220 and nutural ( ground) it all works fine but i am thinking where is the ground

Hi,

Which country are you located in?

If you are in the US then use one leg of the 220v and the Neutral as you have done. The ground should be wired into the building as a separate thing.

In the US 220v we use two 110v legs which are out of phase to each other to produce 220 overall. You have a neutral line and from it to either of the legs will give 110v and between the two 110v legs you get 220v.

Dave

[jamfixer]

i am in canada and much thanks for the help

[NC Cams]

We had a neutral fault issue with a computer and the 3 phase machine it was tied to as a as a BTR device. Suffice it to say that he neutral fault on the PC side FRIED the motherboards in our 5T Fanuc machines.

Suggestion; get professional wiring help. No matter what this would have cost us, it would have been MUCH cheaper than what it cost us to repair the 5Ts

[jamfixer]

Originally Posted by NC Cams We had a neutral fault issue with a computer and the 3 phase machine it was tied to as a as a BTR device. Suffice it to say that he neutral fault on the PC side FRIED the motherboards in our 5T Fanuc machines. Suggestion; get professional wiring help. No matter what this would have cost us, it would have been MUCH cheaper than what it cost us to repair the 5Ts

so what you are saying is,, be scared be very scared that it might work??

let me recap

i an powering a battery back up unit from a 220 volt machine
do you know a good source of industurial electrial personal in canada?
thanks
br

[Al_The_Man]

I am not clear on how you have this wired, but if you are powering a battery back up unit or UPS from a 220 to 110v isolation transformer, you may have to set up a local neutral to satisfy the Bat unit, if in fact it operated OK when you used your service supply which had the neutral grounded.
Al.

[NC Cams]

"...so what you are saying is,, be scared be very scared that it might work??..."

No not at all. Just sharing a personal experience that occured as a result of a smart assed millwright who swore that "he knew what he was doing" His subsequent "sorry about that" cost me nearly $5000 in repairs due to his "expertise". :

"do you know a good source of industrial electrical personal in canada?"

Sorry no. I"d try the yellow pages or perhaps a colleague who might know of someone.

[Al_The_Man]

Originally Posted by NC Cams "...so what you are saying is,, be scared be very scared that it might work??..." .

No, What I am saying is that not enough information has been given on what the equipment consists of to give a decisive reply.
To resolve the issue by way of a forum like this, more than a couple of line of vague description is required.
Al.

[GeneK]

Doesn't the computer have a setting for 220 volt operation? Most that I have seen you just flip a switch on the power supply.

GeneK

[jamfixer]

Originally Posted by GeneK Doesn't the computer have a setting for 220 volt operation? Most that I have seen you just flip a switch on the power supply. GeneK

i dont belive the ups does,, genek,,all computers do i belive

[jamfixer]

Originally Posted by Al_The_Man No, What I am saying is that not enough information has been given on what the equipment consists of to give a decisive reply. To resolve the issue by way of a forum like this, more than a couple of line of vague description is required. Al.

thy this the man
http://openbookproject.net/electricCircuits/Exper/EXP_4.html

and you should change your

imagation is more impotant dan knowledge
to you have no imagation
quote
and forgive me if u find me rude,, i find people u in need of an imagation
and i need a spell checker,
so it's all relative so to say

[Al_The_Man]

I did not say I found you rude, all I intended to imply is that more information is needed in order to give an informed response to your question.
It is very hard to guess what you have and how it is wired.
Al.