24 May
2011
24 May
'11
8:08 a.m.
Hi all,
I am restoring an old IBM terminal with a ferro resonance transformer.
I slowly increase the prim voltage with a variac.
At the same time I measure the sec voltages.
The normal voltage at the prim site is 240V
At +/- 130V (prim) I have already normal voltage at the sec site.
(+5V , -18V etc)
The sec side is loaded and contains no regulators.
Anyone any idea why at 130v everything is normal.
I don't dear to go to 220V
Thanks for all your replies.
Henk
24 May
24 May
10:01 a.m.
I am restoring an old IBM terminal with a ferro
resonance transformer.
I slowly increase the prim voltage with a variac.
At the same time I measure the sec voltages.
The normal voltage at the prim site is 240V
At +/- 130V (prim) I have already normal voltage at the sec site.
(+5V , -18V etc)
The sec side is loaded and contains no regulators.
Anyone any idea why at 130v everything is normal.
I don't dear to go to 220V
For a high quality ferroresonant transformer, this is possible. They
can often maintain regulation over a very wide range of input voltage.
--
Will
10:24 a.m.
On 24 May 2011 at 13:01, William Donzelli wrote:
For a high quality ferroresonant transformer, this is
possible. They
can often maintain regulation over a very wide range of input voltage.
However, it's not a good idea to operate ferros too far from the
nameplate voltage. As you get farther away from it, efficiency (not
that great to begin with) really starts dropping.
If the nameplate says 240V, then that's what should be applied--and
at the specified frequency--ferros are not particularly tolerant of
supply frequency variations.
--Chuck
5009
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5009
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cclist＠sydex.com -
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