[SEL] Totally "Off Topic" question.

[Bob Willman]

	The buzz is probably from the charger having to supply a continuous
high current to batteries that never reach a full charge which would
normally then reduce the charge current to a small value to keep the
batteries charged. I would guess that moving the UPS would not make much
difference. 


Bob Willman
The Eagle's Anvil
WB8NQW
Bowling Green, Ohio

America will never be destroyed from the outside. If we falter and lose our
freedoms, it will be because we destroyed ourselves.

Abraham Lincoln



-----Original Message-----
From: sel-bounces at lists.stationary-engine.com
[mailto:sel-bounces at lists.stationary-engine.com] On Behalf Of Jerry Evans
Sent: Wednesday, April 21, 2010 3:34 PM
To: stationary-engine at oldengine.org; sel at lists.stationary-engine.com
Subject: [SEL] Totally "Off Topic" question.

Hi all you Guys and Gals out there,

         The lists are pretty quiet at the moment so I do not feel too bad
about posting the following "Off Topic" question to the "Assembled Knowledge
Base" out there (that's all of you). (Delete key is bottom right on most
keyboards).

         I've recently being getting my office in order (this happens every
10 years or so - clean out the ashtrays - tidy the desk - get the filing
sorted out - wash the floor etc. I'm sure you know the drill).

         My whole computer system is powered by a really big old UPS
(Interruptible Power Supply). Nothing like these nice modern shoebox size
UPS units. This one was bought on an auction about 18 years ago and used to
power ICL's complete PABX telephone system. It is big - footprint of 300 x
350 mm and stands 660 mm high.

         Without looking at all the specs. It is basically a battery charger
which charges 4 small motorcycle sized batteries (12 volt each = total 48
volts) and an inverter that takes this 48 volts from the batteries and
supplies 220 volts to my computer. (There is a P.C. board inside it which
does all of this).

         My problem at the moment is that the batteries need replacing and
the unit is causing a "buzz" on my telephone which can get pretty annoying.

         The main purpose of a UPS is to be give the user a chance to backup
his work and switch the computer off - I still have this, the UPS will still
power the computer for at least 15 minutes (previously it was about 45
minutes) in case of a power failure.

         I had the same problem about 6 or 7 years ago and put new batteries
into the UPS and this sorted out the "Buzz" on my phone.(This "buzz" is not
only audible on my phone handset, the person on the other end of the call
can also hear it).

         O.K. the above is the explanation so here are my questions:

         i) Right now, I cannot afford to replace the batteries in the UPS
so my first question is: "Will it help if I move the UPS further away?" I
could move it up to about 40' to 45' away and run a heavy extension cable to
the computer.

         ii) The UPS supplies the power to my computer as well as my "DSL
Router" (to which my telephone and computer is/are also connected). The "DSL
Router" could be supplied with (dirty) power from another circuit in my
workshop by means of an extension cable. This would be a different "Phase"
of my 3 Phase power supply and the "DSL Router" does have a "filter and
surge protector" between it and the power source.

         O.K. that's about all the info I can give you experts right now. 
(if needs be I could take the UPS apart and find other specs. but maybe I've
given you enough info for now :-))


         Apologies to list members to whom these questions mean nothing but 
I do know that there are members out there who can answer them - the lists 
are quiet at the moment so "what the heck".

Thanks guys 'n gals for the help I always receive from these two very 
special lists.

Keep the revs up (or down)
Jerry Evans
Near Johannesburg in Sunny South Africa.

P.S. I'm totally STUPID when it comes to electronics - does it show ????? 

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