Hi,

I am buying a machine for my business from Brazil. They have replaced
the 60Hz motor with a 50Hz but are worried about our 240v system. The
machine will run at 220v but they think - see following:
as you said, we saw that in the UK with 240
VAC voltage range of +10% -6% and frequency of 50 Hz. We have a motor
in
stock, 220 VAC / 50 Hz, equipment for use in Portugal and other Latin
American countries and we will replace it with this. The problem now
really
is the voltage, the difference of 20 VAC can generate overheating in
motor
and, in future, burn the central's components. The solution is, maybe
simple
tor find in UK, use an transformer 240 VAC input for 220 VAC output of
1.2
KVA or more. Unfortunately, we don't find this transformer in Brazil,

From further investigation I have realised that we now run on a 230v
-6% +10% system in this country. Would I still need to worry about
transforming down to the exact 220v or do you think that this is more
of a 'caveat' from the company in case of future issues with the
motor?

Cheers for any help you can offer

James

In article
,
James Purslow wrote:
Hi,

I am buying a machine for my business from Brazil. They have replaced
the 60Hz motor with a 50Hz but are worried about our 240v system. The
machine will run at 220v but they think - see following:
as you said, we saw that in the UK with 240
VAC voltage range of +10% -6% and frequency of 50 Hz. We have a motor
in
stock, 220 VAC / 50 Hz, equipment for use in Portugal and other Latin
American countries and we will replace it with this. The problem now
really
is the voltage, the difference of 20 VAC can generate overheating in
motor
and, in future, burn the central's components. The solution is, maybe
simple
tor find in UK, use an transformer 240 VAC input for 220 VAC output of
1.2
KVA or more. Unfortunately, we don't find this transformer in Brazil,

From further investigation I have realised that we now run on a 230v
-6% +10% system in this country. Would I still need to worry about
transforming down to the exact 220v or do you think that this is more
of a 'caveat' from the company in case of future issues with the
motor?

Cheers for any help you can offer

The UK mains 'spec' was changed to fall in line with Europe, but didn't
actually change.

If a motor is made for use in Europe , it should be ok.

--
*Ah, I see the f**k-up fairy has visited us again

Dave Plowman London SW
To e-mail, change noise into sound.

I am buying a machine for my business

Depending on what type of machine it is, there may be British or EU
type approval or health and safety compliance issues - particularly if
you're talking about woodworking machinery or the like.

On 24 Aug, 15:47, " wrote:
I am buying a machine for my business

Depending on what type of machine it is, there may be British or EU
type approval or health and safety compliance issues - particularly if
you're talking about woodworking machinery or the like.

Going by the subject,line I assumed it was some sort of heavy duty
epilator :=))

On 24 Aug, 12:18, James Purslow wrote:
I am buying a machine for my business from Brazil. They have replaced
the 60Hz motor with a 50Hz but are worried about our 240v system.

Easiest thing is to ship it sans motor, and fit an appropriate one
here. You get a local motor that works and has some service backup,
and you also save some shipping weight.

Mate of mine recently bought a US-made milling machine that arrived
with a conversion transformer, although it was so poorly made it had
no earth continuity (let alone paperwork claiming it ought to). Both
transformer and motor had the build quality of late '70s British
Leyland and have since gone skipwards.

If you're UK and commercial, you also need to read the PUWER 98 regs.
HSE website has some prtety readable guides, at least for woodworking
machines. Your main problem is the requirement for a rapid spin-down
time after power-off. This can need electric braking adding.

On Aug 24, 10:34*pm, Andy Dingley wrote:
On 24 Aug, 12:18, James Purslow wrote:

I am buying a machine for my business from Brazil. They have replaced
the 60Hz motor with a 50Hz but are worried about our 240v system.
I have a belt sander(porter cable 362) circa 2002 that was bought in
America. I have used it on a couple of jobs with a step down 110v 5kva
site transformer. With a plugin energy monitor it claims to be around
1300w when running loaded.

Would running at 50hz, rather than 60hz damage the transformer. A
1.5kva transformer eventually overheats and trips the thermal fuse. Id
really like to get it converted to 240v as a 5kva transformer is a
beast to haul around. Does anyone know if its possible and the likely
cost? Found a schematic on the web that shows a 220v armature. Similar
4inch sanders seem around £150-£200 but this one is very well balanced
and weighty so I don't really want to buy a new one.

Dave.

On 24 Aug, 23:02, Dave Starling wrote:

Would running at 50hz, rather than 60hz damage the transformer.

Not a UK site transformer - that's already designed for 50Hz.

The motor may get unhappy about extra heat from the increased magnetic
losses at 50Hz, as it's otherwise trying to draw the same current. The
110V mill motor I mentioned above was happier run from a variac at
about 90V than it was at 110V.

On Aug 24, 12:18*pm, James Purslow
wrote:
Hi,

I am buying a machine for my business from Brazil. They have replaced
the 60Hz motor with a 50Hz but are worried about our 240v system. The
machine will run at 220v but they think - see following:
as you said, we saw that in the UK with 240
VAC voltage range of +10% -6% and frequency of 50 Hz. We have a motor
in
stock, 220 VAC / 50 Hz, equipment for use in Portugal and other Latin
American countries and we will replace it with this. The problem now
really
is the voltage, the difference of 20 VAC can generate overheating in
motor
and, in future, burn the central's components. The solution is, maybe
simple
tor find in UK, use an transformer 240 VAC input for 220 VAC output of
1.2
KVA or more. Unfortunately, we don't find this transformer in Brazil,

From further investigation I have realised that we now run on a 230v
-6% +10% system in this country. Would I still need to worry about
transforming down to the exact 220v or do you think that this is more
of a 'caveat' from the company in case of future issues with the
motor?

Cheers for any help you can offer

James

Britain is not 230v, its 240v. This is a very common mistake to make,
as our 240v with asymmetric tolerances is officially called 230v, and
people tend to assume it therefore actually is 230v Its a bit complex,
but in short you can expect 240 at the socket.

If the machine is 220v 50Hz, your need to lose that extra 20v. an 18v
transformer's the easiest safest option. You dont want a 220v
transformer - another common misunderstanding. If its 1.2 kVA at 220v
the transformer would need to be 1200/220= 5.5A or 5.5x18= 99VA so a
100VA tranformer would do it.

Some of the figures and concepts in here may seem strange, I've not
explained it all by any means, but its all explained I hope tolerably
well in
http://wiki.diyfaq.org.uk/index.php?title=Droppers
and
http://wiki.diyfaq.org.uk/index.php?...tricity_Basics

PS the situation with 220v in brazil is not the same as with france.


NT