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We had ordered a UPS for our AS/400 and I started looking at the system settings for UPSes and asked the same question you did, how the heck does the AS/400 know how much power the UPS has? I received the AS/400 UPS and got my answer, there is indeed a communications cable that goes from the UPS to a special port on the AS/400. My understanding, without this cable, the AS/400 has no idea it's even on a UPS. So CALC would be ignored, and any other settings dealing with UPSes. You should look at your UPS and see if there is a communications connector on it (I seem to recall it was a db9, although it might of been a 25 pin). If it doesn't, your UPS is probably not designed with the AS/400 in mind. Also, since the AS/400 shut down immediately upon the power to the building being shut down, that makes me think your UPS is not powerful enough to run the AS/400. Most likely the AS/400 power supply saw a drop of AC voltage below it's minimum safety limit and shut off (I could be wrong on that, but I know that's how many other computer's power supplies work). I think you have a little research to do on both your current UPS and it's capabilities, and what the AS/400 requires for a UPS. Regards, Jim Langston Message: 1 Subject: UPS & AS/400 talking to each other Date: Fri, 21 Sep 2001 12:57:52 -0400 From: "Bale, Dan" <D.Bale@handleman.com> To: <MIDRANGE-L@midrange.com> Reply-To: midrange-l@midrange.com Somewhat related to my last post on SPCN... I noticed that my QUPSDLYTIM system value is set to *CALC. How does the AS/400 know how much juice is left to be able to determine whether it needs to start shutting down? Is there another cable that allows the UPS and AS/400 to communicate this information? I don't think our UPS's have that, or if they do, they were never set up to do this. If a comm cable is required, then what is the effect of the *CALC setting? Background for all this: Last night, one of our branches cut power to the building to install a new A/C unit (unbeknownst to us), relying on the UPS to keep all of the computer equipment up for the "short" time that the electricity was going to kept off. I was told by the branch manager that the AS/400 lost power immediately after the building power was turned off. While the building power was off, we powered the AS/400 back up, so this is how I know that the AS/400 was attached to the UPS. The IPL was proceeding when the UPS got completely drained 15 minutes later and then all equipment on the UPS went down. Main power was restored shortly thereafter, the AS/400 IPL'd normally (!), got a signon screen within 20 minutes (a normal IPL for this box), nothing "damaged" as far as I could tell. Lessons learned: Don't power the AS/400 back up until after main power was restored. WHAT THE @#%* WAS I THINKING? Dan Bale IT - AS/400 Handleman Company 248-362-4400 Ext. 4952 D.Bale@Handleman.com
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