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dl380 G5 shuts down when ups switches to battery

I have several DL380 G5 servers that instantly shut down when UPS switched to battery. These are all pure sine wave UPS units. two of the UPS units are APC and one is Eaton. they are 1500VA units.

One interesting thing is that out of 3 servers, 1 of the 6 power supply's will hold during the switch-over. that is, when I move this power supply to different servers and UPS units, the server stays running during the switch-over.
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AriaProII
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AriaProII
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JohnBusiness Consultant (Owner)Commented:
I have looked at this a couple of times. A true UPS never switches to battery. All power for a true UPS comes from the battery through the invertor in the unit.

So then are your units true UPS units?  Check the specifications. Ask APC support how to test the units.

Do you have the units hooked up to your servers and are server settings correct for no AC power? There is a setting to say how long the load will go before shutting down in an orderly manner. Is that time interval set to zero?
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AriaProIIAuthor Commented:
hi John, thanks for your reply. Not to get in a huge discussion about UPS's, the fact is that most do switch to battery and except for some very high end units have a specification for the switch-over time usually in the range of 3~6ms. also, I have been using these type of UPS units for many years and never had any problems. at this time I have other servers that work just fine on these units (G4's, G6's and others). Normally, the power supply can bridge this gap without incident, but these G5 servers instantly switch off and then back on and this (usually) happens both when the UPS switches to battery and when switching off battery. hope this helps to clarify.
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JohnBusiness Consultant (Owner)Commented:
Any true UPS (even entry level) lives off the battery and there is no switch over.

Did you check the time intervals as suggested?
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andyalderCommented:
DL380 G5 PSUs were a pile of dog's mess, you probably have the early ones that don't have all the mods done to them. Each time you shut down and leave on standby with amber LED on PSU switch they cook themselves a little more. Fortunately they're pretty cheap to replace but even then check them against this HP thread. The info is only semi-public, there is no HP advisory except on the partsurfer CD. The advisory was posted in that thread at one time but HP removed it as "For HP and Channel Partner Internal Use" meaning they did not want people to know their PSUs leaked white goo!

http://h30499.www3.hp.com/t5/ProLiant-Servers-ML-DL-SL/DL380-G5-power-supplies-overheat-when-plugged-in-but-off/td-p/3982566/page/2#.VR2J3eH7Ph4 (c.wolf comment with identification info in it although rest of thread is worth reading through too).

Decent UPSs will switch from double-conversion to fast cut-over depending on their past experience of the mains supply feeding them although you can override this intelligent action doing so reduces battery life. But that's not really relevant in this case.
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AriaProIIAuthor Commented:
thanks for the info! I am looking into this now trying to make heads or tails out of that post, I think I know what I'm looking for in power supply replacement. I will report back after replacing. one thing I will mention is that these servers have been run 24/7 since new, never in an off state with power applied. However, I believe that they did not have this problem at one time.
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andyalderCommented:
I would buy one of the newer 379124-001 PSUs and try it or just cxompare the label of the one that behaves with the others that don't.

With regards to DL380 G5s that have been running 24x7 for years I had one site like that who decided to move their computer room one weekend and we had to ship 9 replacement PSUs out to them Monday morning!
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AriaProIIAuthor Commented:
good to know. I'm ordering a PSU today.
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diperspCommented:
Yup, I agree with the others.  Had lots of issues with these.  Get the latest and greatest PSUs and you should be good.
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JohnBusiness Consultant (Owner)Commented:
Did you try a new Power Supply yet.

I did an experiment with my own APC UPS backup unit.

I connected a good oscilloscope to the output of the UPS and set up voltage and time so I could see what happened. 100 Volts per division vertical and 5 mS per division time base.

Then I turned off the circuit breaker. The worst transition lasted about 2 mS and was about 25 volts in amplitude.  That is, on the overall up cycle of the sine wave, there was a little spike of about 25 volts for about 2 mS.

There was no voltage dropout over switchover at all. And 25 Volts for such little time is well within the parameters of a decent power supply. None of my equipment (2 computers, modem, router and a Wi-Fi router) flinched.

So your issue must be down solely to bad power supplies.
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AriaProIIAuthor Commented:
UPDATE: I ordered a new power supply to try with part number 379124-001 as suggested by andyalder. I received the wrong power supply (older number) and returned it and went on the hunt for the right number. I think I found the right one now and ordered it. still waiting for delivery. should be able to test out next week and will report back. Thanks!
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AriaProIIAuthor Commented:
Thanks for your help. problem finally solved!
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