RE: [CAD_CAM_EDM_DRO] Re: U.S. 220 vs Euro 220

Actually, going from 240V 60Hz to 220V 50Hz presents little or no problem
for motors of any appreciable size (5HP or larger). The motors will
produce lower horsepower primarily due to the reduced RPM, but motors in
industrial use are generally sized large enough to have a satisfactory power
margin even with the reduced power ans RPM. On one larger job, we moved
several hundred motors and the associated equipment from Oregon, USA to
Moscow, Russia and no "out of the ordinary" failures have been noted after
six years of use. We did, however, change the power transformers in some RF
glue curing machines as the manufacturer said we would have reduced RF power
and the 60Hz transformers would not have the power reserve that may be
required on startup with cold filaments.


Ward M.

wardmerk@... <mailto:wardmerk@...>



-----Original Message-----
From: ballendo@... [mailto:ballendo@...]
Sent: Monday, May 21, 2001 5:18 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: U.S. 220 vs Euro 220


Sven,

Exactly! The use of 60hz motors on 50 hz will likely burn them up.
Running 50 hz motors on 60 is ok. Best solution is 120/240; 50/60
motors for anything sold/used worldwide. Xfrmrs also should be 50hz
rated for usage in europe.

Hope this helps.

Ballendo

--- In CAD_CAM_EDM_DRO@y..., "Sven Peter, TAD S.A." <peteryco@r...>
wrote:

> Europe is dangerous for US machines!!!!!
> US is no problem for European machines!
>
> I looked meanwhile through some other posts on this thread.
> It seems like Europe is now changing over to 230 Volt 50 Herz.
> This might make changes better for you. But when I lived back
> in Germany we had 220V 50 Hz. One leg life and the other neutral

and the

> third true ground. This might give problems as it was mentioned with
> 120V users,
> which often are hidden inside the machine without mentioning in the
> manual.
>
> These two currents are definitely very different.
> In America we have 240 Volts and 60 Hertz frequency
> in Europe there is 220V and 50 Hertz.(Now or soon 230V)
> The 50 Hz motors are designed to have much more inertia than the 60

Hz

> ones. The rotors are much beefier in Europe.
> At least this is the case with threefase and normal singlefase

motors.

> How it is with DC and step motors I have no clue.
>
> The result is you can easily take a machine from Europe to America.
> Only the motors rise 20% in speed and loose 20% in torque.
> For contactors you frequently have to step up the voltage
> from 220V 20% up to 264 Volt. Otherwise they shatter.
> But if you take from America a machine to Europe you will
> burn it in a very short time,because the motors low inertia.
> In other words the gap between the sinus curve of voltage in 50 Hz
> is too long and the motor for 60 Hz does not come over this dead

point.

> If you want to take it with you, you probably need a inverter to

produce

> your own 60 Hz current.
> Hope this is a hint and saves you a loss.
> Good Luck
> Sven Peter
>
> blueveil@e... wrote:
>
> > Does anyone know if U.S. 220 is the same as European 220?
> > Could I take a 220 single phase cnc machine to Europe and use
> > it without any adapters?
> > Any knowledge on this subject would be greatly appreciated.
> >
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