Data closet monitoring results.
Data closet monitoring results.
(OP)
I have a "data room" that is filled with servers, routers, etc., in a multistory building. It runs with no problems for several months then takes a hit that causes most stuff in the closet to go down. This is a serious problem as stuff like phones and online stuff promptly fail.
It is a three phase closet. It has two lightly loaded phases 3-8amps and one unloaded phase <1A.
After several days of logging everything-under-the-sun there was one hit where one phase dropped to %80 percent V and the other dropped to like %90 but these didn't trigger a "closet event".(I haven't figured out the hit's duration but less than the many power supply carry throughs.)
I do have data coming later this week that shows a "closet event".
I looked at all the data +100 pages and saw nothing out of the ordinary except the ground... As seen below.
This is not the neutral! This isn't what I expected.. A discussion would be helpful. Thoughts?
It is a three phase closet. It has two lightly loaded phases 3-8amps and one unloaded phase <1A.
After several days of logging everything-under-the-sun there was one hit where one phase dropped to %80 percent V and the other dropped to like %90 but these didn't trigger a "closet event".(I haven't figured out the hit's duration but less than the many power supply carry throughs.)
I do have data coming later this week that shows a "closet event".
I looked at all the data +100 pages and saw nothing out of the ordinary except the ground... As seen below.
This is not the neutral! This isn't what I expected.. A discussion would be helpful. Thoughts?
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com






RE: Data closet monitoring results.
Am I reading that right?
Mike Halloran
Pembroke Pines, FL, USA
RE: Data closet monitoring results.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Data closet monitoring results.
I am concerned with the 99.26 amp hit at 18:30:15, on Sept.22, '06.
A spike of that magnitude has the potential to trigger a "closet event" even if it did not this time.
I would suspect a faulty surge arrestor. They are normally the only components that you would expect to find deliberately connected from hot lines to ground. Do you show a corresponding current spike on either of the hot lines? Those electrons had to come from somewhere.
Can you shut down one piece of equipment at a time while monitoring the ground current If you can isolate one piece of equipment that is making a disproportionate contribution to the ground current, that may be the culprit. 5 AM isn't much fun but most of us have done it at one time or another. I suspect that you have already done more trouble shooting at inconvenient hours than most of us.
Respectfully
RE: Data closet monitoring results.
There should be some anomalous heat associated with that current.
Maybe enough to detect with a handheld IR thermometer, manually scanned. Look for stuff that shouldn't be particularly warm, and nonuniform temperatures among similar components.
Mike Halloran
Pembroke Pines, FL, USA
RE: Data closet monitoring results.
What is the difference between the green and gray traces?
RE: Data closet monitoring results.
Would be interesting to see data of the "closet event". Sounds like some loose connection some where that goes to ground once in a while, long/large enough to bring voltage down to shut down equipment but not trip a breaker.
RE: Data closet monitoring results.
It will necessarily be a process of elimination unless you can trace the ground current to the source.
RE: Data closet monitoring results.
Then get a window to crash the room, unplug branch's until it's zero. Run it down.
But be sure your monitor is set correctly against the fluke meter's amp clamp.