[Amps] -48 Volt Switching Power Supplies

[PA3DUV]

>Additionally, many of these units operate from 240 volts
>a.c., single-phase, of course, so hook up with care.

Since the Neanderthalers left, all houses are wired for 230 VAC here ;-))

Cheers, Dick
PA3DUV

 




----- Original Message ----- 
From: "HAROLD B MANDEL" <ka1xo at juno.com>
To: <Amps at Contesting.com>
Sent: Monday, November 21, 2005 6:03 PM
Subject: [Amps] -48 Volt Switching Power Supplies


> Dear Friends,
> 
> Before running off and making a cash offer on a surplus -48 Volt
> switcher supply from a telecom location please consider that
> it may or may not be working.  It takes an Act of Congress
> to get these replaced, and the one thing that qualifies for
> replacement is when the magic has gone out when the
> white smoke came out the top.
> 
> Additionally, many of these units operate from 240 volts
> a.c., single-phase, of course, so hook up with care.
> 
> Additionally, many of these units connect to a controller
> in the power plant that controls the output voltage and
> without a controller will not emit.
> 
> Additionally, several models need to be connected
> to a string of battery cells before turning on any
> D.C. output. This is called the Reference Voltage
> and when a string of rectifiers are operated in
> parallel the common  battery plant enables the
> central and rectifier controllers to adjust the
> float voltage to a few hundredths of a volt
> regulation.
> 
> If you have any questions or find something
> looking promising, please don't hesitate to 
> give me a shout.
> 
> Hal Mandel
> W4HBM
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