RE: Model 170 with UPS on V4.2.0

[Neil Palmer <npalmer@xxxxxxxxxxx>]

One possibility - maybe you are suffering short 'brownout' periods (low
voltage) in your power supply ?
These would usually go unnoticed by looking at the lights, listening to
a radio, etc. (which is how the power companies get away with doing it
deliberately during periods of high demand - like heavy air conditioning
usage on hot summer days).
You could have two UPS' and maybe only one experiences the problem ?
Well that could be because each UPS would have it's own (usually
configurable) settings for low and high voltage limits.  Maybe one is
set a few volts higher than another and doesn't sense a brownout that
the other one reacts to.

We have an old BEST FC7.5Kva UPS powering the computer room (and half
the power outlets in our office, so we can plug every PC and terminal
into it), and some days it will kick on several times for brief periods.
(There's a minimum on period of about 14 seconds when it does trigger). 
Our low/high voltage limits are set at 108/130.

A less likely cause of momentary UPS activation could be a variation in
the power cycles/second.  The low/high limits on our UPS are set at
59.5/60.5, and the normal supply varies between 59.95 and 59.96
cycles/second.


Neil Palmer                                AS/400~~~~~      
NxTrend Technology - Canada   ____________          ___  ~     
Thornhill, Ontario,  Canada   |OOOOOOOOOO| ________  o|__||=   
Phone: (905) 731-9000  x238   |__________|_|______|_|______)   
Cell.: (416) 565-1682  x238    oo      oo   oo  oo   OOOo=o\   
Fax:   (905) 731-9202       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
mailto:NPalmer@NxTrend.com    AS/400  The Ultimate Business Server      
http://www.NxTrend.com

> -----Original Message-----
> From: Glenn Ericson [SMTP:Glenn-Ericson@att.net]
> Sent: Sunday, June 21, 1998 9:52 AM
> To:   MIDRANGE-L@midrange.com
> Subject:      Model 170  with UPS on V4.2.0
> 
> At  least  once or twice a day  the system  issues a CPF 1817  saying
> lost
> utility  power  then  ruins  3 - 20 seconds on  UPS  and reverts back
> to
> normal power message.  
> 
>  Across the  last 9 days it  has happened 5 -6 times No lights flicker
> or
> other outward appearing  electrical failures are noticeable.
> 
> Is  anyone experiencing this  type  error   or is there a PTF out
> there?
> 
> I  checked the  connections between the CPU, Console UPS and  outlets.
>  all are  well seated.
> 
> Configuration - a small  [2159]  model 170 & the  larger power supply
> 
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