240v isolation transformer

[xrodney]

Hi

can any body help me in finding a 240v isolation transformer?  I need to use it with a u5000 monitor.

any UK or european suppliers?

xrodney

[xrodney]

are these good?

http://www.ebay.co.uk/itm/NEW-Mains-Isolation-Transformer-200VA-230V-PRI-24V-12-0-12V-SEC-CCM200-24-/290580673901?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item43a7f5356d

[ed12]

no
they are step down
what u are looking for is a 1 to 1  240volt isolation transformer
not a step down
make sure as u are in uk it spec's 50-60hz
most important

ed

[MonMotha]

Isn't the U5000 SMPS?  It may not be free-range, though if not, I'd think it would be low-range (100-125V), not 240V, in which case a step-down would be appropriate, and you may as well get an isolating one.

That said, OP's link is to a 24V secondary, which is not what you want.

[ed12]

MonMotha
u are correct
it is free range
if the op would google  >wg u500<
it is there first page
thk's for catching it

ed

[xrodney]

Can you help me find one please ?

I would appreciate it

[ed12]

i did a google on 240-240 last night
turned up a boat load of them
but as was pointed out
if u go google wg u5000
and d/l the service manual u will
find out it is a smps driven unit
hence it dose not need isolation

ed

[xrodney]

Hi ed
Thank you for your reply. Bob roberts said it is best to do one. Better for chassis, even more because we use 240v

[ed12]

thats a truly 50/50 thing with smps style monitor's
u see it is inherintly isolated because of its design
but if it will make u feel better
try hammond mfg..they make the largest selction of iso's i know of
www.hammondmfg.com/
or mouser carry's there line
as dose digikey

ed

[xrodney]

Thank you Ed. Can you please send me the specifications of the iso i need? Because i am not experienced in monitors. Or if you can send me some links, i would appreciate it

[ed12]

i did look in my reply..
what u want in specific is a 240volt to 240volt isolation transformer
50/60hz
important part here
1 to 1
@ 300va
make sure u spec it exactley as i said it
1 to 1 @300va 240 volt to 240 volt isolation transformer
u should be gold

ed

[grantspain]

never used a iso on a u5000,probably wired up 100 of these over the years
not required

[xrodney]

Hi Grant,

I will use it on 240v and was advised to use am iso transformer.  Do you think I will not need it with 240v?

[ed12]

we have all been saying the same thing
u do not need an iso on a u5000..
olny time i use 1 is when i am testing the input side on my repair bench

ed

[Ken Layton]

The U5000 schematic shows it is only intended to operate on 90 to 120 volts AC. If you tried to operate it on 240 the monitor chassis would be destroyed!

Apparently what I gather is that he wants to operate a monitor (the U5000)  designed for 120 volt operation on 240 volts. If that is the case, then he needs a 240-to-120 volt step down power transformer rated for at least 100 watts.

Here's one, but you may need to change the connectors:

http://www.world-import.com/tc-100a.htm

http://www.220-electronics.com/step-down-voltage-converters.html

http://www.220converters.com/step-down-converters.htm

http://www.voltagesuperstore.com/powerspark-model-1-1500-watt-step-down-voltage-converter.html

[ed12]

ken as a rule..i will not call u out on this
but the pdf i have,show's a clear range of 110-220 volt ?
so now we are back to iso ?
if this is the case the pm i sent him back  showed the hammod step down
this is getting to muddy..as 100% of smp's can and will take 240volt np
but on the side of saftey iso in order..
now as a rule
when i work this thing's
first thing i look at
a=switch power supply
and or no..if no i iso
if so i know i do not need it
never heard of a dif..but hey..i am open

ed

[Ken Layton]

The U5000 schematic I got straight off of Wells-Gardner's website shows 90 to 120 volt operation labeled right by the power connector:

http://www.wellsgardner.com/pdf/Schematics/U5000_25_inch.pdf

[xrodney]

On page 5 it says that if operating at 240v, an alternate thermistor must be used.  What is that

So Ken, a normal step down transformer should do the job?

So you have a Mortal Kombat manual? Im the power schematics, it shows that the iso transformer has jumpers to switch between operating voltages, am I correct?

[grantspain]

u5000 are full range ac,maybe different in u.s but every one i have ever seen in uk is full range ac and i run direct from mains socket-just like hantarex polo range

the thermister they talk about is for the degauss coil

if you want to run this on a standard stepdown you can if you wish

[xrodney]

Here is the transformer chart for an MK2, apparently it supports multiple voltages.

can you confirm?

[ed12]

well ken
i had to re-read the spec's
right in pg 2
a/c input power supply type smps
no isolation needed
94vac-264 vac
it's right in there manual..there word's not mine
but the point is moot as the op want's to go iso

ed

[MonMotha]

It's not uncommon to need to change the degauss a bit for 120V vs. 240V operation.  Some of my monitors have two different places to plug in the coil depending on input voltage.  The rest of the off-line design (basically just the SMPS) is often, BUT NOT ALWAYS, free-range.  I've got some Japanese monitors that are good from ~90-130V but definitely do NOT like being run on 240V according to some people I've talked to.

If in doubt, just grab a isolating, step-down (240V->120V i.e. 2:1), 50Hz capable, transformer for cabinets/monitors designed for USA or Japanese operation.  Then you're set no matter what.

[xrodney]

SOLVED.

Went to the UK for work, and got a Midway original iso transformer with me  

now looking forward to install everything