Re: UPS Connection at V5R4

[ChadB@xxxxxxxxxxxxxxxxxxxx]

There are (or were at some V5R3 PTF levels) situations where the 520s will
not see the cable being attached/detached unless it was detected at power
up of the box (and on some occasions, we had to actually UNPLUG the 520).
Don't remember all the details as it's been almost 3 years ago, but there
were definitely some hoops to jump through with these UPS cables.



                                                                       
             James Lampert                                             
             <jamesl@touchtone                                         
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Lukas Beeler wrote:
> The only way i found so far to test this was very very stupid (there
> probably is a better one):
>
> Power down the machine. Unplug the power (to power down the FSP). Unplug
> the UPS cable. Power up the machine. You might now see a message telling
> you that an UPS has been disconnected. Power down the machine. Unplug
> the Power. Plugin the UPS cable. Power up the machine. Check DSPLOG and
> QSYSOPR MSGQ for a message telling you that an UPS was found.

There should be no need to power down the machine to test whether or not
  it can detect connection/disconnection of the UPS cable. We've
connected/disconnected these cables on "live" machines with no problems
whatsoever.

We've even had (and it's in the archives) to add relay boxes to suppress
the "low battery" signal during UPS self-tests, as that signal, combined
with an "on battery power" signal, induces an immediate, unstoppable,
emergency power-down (with the consequence of a rather protracted IPL).
We've also constructed relay boxes to mimic UPS signals purely based on
line power status.

With a chart of the pinouts, and the appropriate breakout box, it should
be possible to simulate any possible combination of UPS signals (but
again, note that some will initiate an emergency power-down, leaving a
large mess to be cleaned up during the next IPL).

--
James H. H. Lampert
Touchtone Corporation

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