Running a 220v computer in a 110v environment

From: allisonp_at_world.std.com <(allisonp_at_world.std.com)>
Date: Thu Oct 7 11:27:52 1999

> If there are no input voltage selector switches hidden inside on the PSU
> and you are reluctant to use a transformer then there's no way to run it
> directly from 115V mains.

Likely incorrect. There may be a jumper that needs to be moved or if
there is an input transformer several jumpers. It's unknown if this is
even a switchmode PS, may be old type linear with a BIG transformer.

> This could be for an air conditioner as the larger A/C's are usually 220V
> units. Just check with your landlord. If for sure a 220 outlet for A/C then

Measure using multimeter would be the obvious means.

> between the outlet and the PSU. Safety is A Good Thing especially to
> prevent damage to the unit and minor things like fires, your death, etc.

Always safety.

> Another thing to consider is whether the PSU will run well on the North
> American 60 Hz line frequency instead of the 50 Hz used in most of the rest
> of the planet. If the AC input rating label says something like '220 V,

Usually, (I know of no exceptions) if it runs on 50hz it runs on 60. The
reverse is not always true, but often it is. Reason for 50/60hz is often
motor speeds (old ac motor disk drives and the like) and equipment with
cheap transformers (not enough iron to work ok at 50hz).

Military equipment Transformers are often designed for 400hz and these DO
NOT like 50/60hz unless built to accept all three.

Something designed for 220/50hz if plugged into a 110/60hz would be safe
but, also a no operate. Generally getting Euro gear to work here is
easier than getting US gear to work there! The exception is TV/VCR stuff.

Allison
Received on Thu Oct 07 1999 - 11:27:52 BST