Re: Lightning - funny how we're not seeing him any more

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w_tom wrote: 
  What were numbers for transient on AC mains?  Transient peak
voltage and transient width.  Were those transients observed
on output of the disk drive's power supply - or did the
company rep check?


I was not directly involved in the measuring of the power problems as I had my work to do. I do know that the power was Much dirtier than that in other parts of town due to the number of Truck repair firms, etc. in the area. Yes, the power was metered going into the disk drives and at its output. We often had recorders running for weeks on the lines.


If transients are "noise", then the APC UPS (as Leythos
defines) also would not eliminate that noise. Such noise is
suppose to be eliminated by the disk drive's power supply. That would be noise; not surges.

What is the manufacturer (or type) of this 4KVA UPS?


The UPS we purchased was from Exide. We have since replaced it with a APC Smart UPS XL after the Exide finally died. Plus the APC unit is much smaller and lighter.



"Michael W. Ryder" wrote:

...
The 4KVA unit I am talking about is a plug in UPS.  It plugs into a wall
socket (granted it uses a locking plug) and the equipment plugs into it.
...

Which APC unit are you talking about?  They make a very large number of
different ones.
...

The unit I am talking about is not a building UPS, but only used for the
computer and the drives attached to it.  ALL of our wiring was new and
up to or above the latest codes.  The computer room was on a separate
wire from the power company and was tested multiple times for faults.
Until we installed the UPS to "clean" up the power we were having hard
drive failures at least once a month.  We had the factory reps for the
company check out the drives and could find no problems other than the
transients in the power.
...

Again, the UPS was plugged into the wall and the power circuit was
properly "grounded".  The problem is that a ground can NOT remove
"noise" from a signal.

.

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