[Nut-upsuser] how normal is this temporary power loss for a single UPS?

[Jon Bendtsen]

On 15/11/2010, at 18.17, Gene Heskett wrote:

> On Monday, November 15, 2010 12:14:18 pm Jon Bendtsen did opine:
> 
>> Hi
>> 
>> Occasionally I get emails from my NUT system saying that one of my UPSes
>> lost power for about a minute.
>> 
>> Losing power:
>> 	Date: 15. nov 2010 17.40.25 CET
>> 
>> regaining power:
>> 	Date: 15. nov 2010 17.41.34 CET
>> 
>> 69 seconds later. But why? None of the 3 other UPSes reports any power
>> loss. What is the problem?
>> 
>> So I made some scripts that logs the input, output and frequency at the
>> time of power loss, but they show nothing strange. Today results was:
>> input	228.9 V
>> 	output	228.9 V
>> 
>> Today the UPS was a APC Smart-UPS 3000 RM, but I have seen it with other
>> UPSes as well.
>> 
>> 
>> How normal is my experiences?
>> 
> Pretty normal if there are any Prolific usb parts in the path.  Although 69 
> seconds is a much longer time frame than I have encountered.  If you are 
> using a ser-usb adaptor, I have found the FTDI parts considerably more 
> dependable in that regard. YMMV or course.

This one is connected using USB directly. One other UPS is on that server using a usb2serial device.


JonB