Re: CPF181A Message

Chris,

No problem. On the lost leg your UPS SHOULD have continued to supply
output power on both legs, yeilding 220v to the AS/400 as well.  With
the loss of the input leg it just can't charge it's batteries. So you
got the logic board replaced because your UPS couldn't figure that out!

Typical 220v applications (AS/400s and UPSs included) won't do anything
without both legs.  If one leg is gone, you can measure 110v with a DMM
or analog volt meter from the good leg to neutral but the 'load' sees
*Zero because of the open leg. There is no neutral used in 220v
applications.  (An open leg has the effect of multiplying the votage on
the other leg by *zero.)  Some outlets have both legs, ground, AND
neutral (such as the L14R's on the back of the Matrix 5000) but that is
so that that single plug could supply 220v OR two set's of 110V
depending on the application.

220v is used again because of Ohms law (I=E/R)  With a doubled input
voltage(E), the current draw(I) is half because(R) is doubled (by the
manufacturer).  It is Current(I) that causes heat so cutting it in half
reduces heat loss and makes for more efficiency.

 - Larry

Chris Bipes wrote:
> 
> Larry,
> 
> Thank You for the detailed definition concerning Phase vs. Legs.  I have 
>never had it explained so clearly in laymen terms.  I have experienced a 
>deltec ups loose one leg of power and go to battery for just the one leg while 
>the other leg was still supplied from the power company.  This shut down a 
>F50, hard.  The other 220v UPS did not loose any power.  None of the 110 
>circuits of the deltec hiccuped, but the one 220 circuit went totally out of 
>sync.  Deltec sent out a repair man who replaced the logic board.
> 
> Christopher K. Bipes             Mailto:chrisb@cross-check.com
> Senior Programmer/Analyst  Http://www.cross-check.com
> CrossCheck, Inc.                  707 586-0551 x 1102
> 6119 State Farm Drive          707 586-1884  FAX
> Rohnert Park, CA  94928
> 
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-- 
Larry Bolhuis         |  
Arbor Solutions, Inc  |  IBM AS/400e - Get There First!
(616) 451-2500        |  
(616) 451-2571 -fax   |  It's 10PM.  Has your NT Server had it's
lbolhuis@arbsol.com   |  theraputic re-boot yet today?
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