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From: cgs@umd5.umd.edu (Chris Sylvain)
Newsgroups: comp.sys.ibm.pc
Subject: Re: 220V/50hz
Message-ID: <1604@umd5.umd.edu>
Date: Fri, 1-May-87 11:37:55 EDT
Article-I.D.: umd5.1604
Posted: Fri May  1 11:37:55 1987
Date-Received: Sun, 3-May-87 01:30:39 EDT
References: <275@pyuxv.UUCP> <2431@ncoast.UUCP>
Reply-To: cgs@umd5.umd.edu.UUCP (Chris Sylvain)
Organization: University of Maryland, College Park
Lines: 21

In article <2431@ncoast.UUCP> wb8foz@ncoast.UUCP (David Lesher) writes:
>
>A 60 hz xfmr run on 50 hz will have insufficient iron. With its
>lower reactance, it will overheat at the lower freq, and often
>*smoke*.

I can't see that the reactance will change much, as 50Hz represents a 17%
decrease from 60Hz, and since Xl = 2*pi*f*L, Xl changes linearly with f.
Besides, all the transformers I've seen in both commercial and consumer gear
meant for 60Hz service used transformers specified for 48Hz to 62Hz. Now,
going to 400Hz power is another story... I think the real issues here are:
1) does any circuitry use the 60Hz as a timebase?
2) does the power supply have a way to be switched to 220V service?
3) if there's no switching for 220V, is the power supply one of the
   switching types that are designed for 80V to 240V?
The answer to the original question is then: NOT[1] AND ([2] OR [3])
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