UPS: Compensating for a high input voltage.

[Richard]

According to the Gospel of St Wiki, 
(http://en.wikipedia.org/wiki/List_of_countries_with_mains_power_plugs,_voltages_and_frequencies)

"Voltage tolerance of 230 V +10%/−6% (216.2 V to 253 V), to be widened 
to 230 V ±10% (207 V to 253 V) in 2008"

The UK voltage is within specification, and I reckon your UPS is being a 
bit overly sensitive.
The thing to watch is the Frequency of the mains... as this will change 
if the grid cant meet demands. (the more the grid cant deliver, the 
lover the Hz goes)

Richard P

Paul M wrote:
> We seem to get a significant number of these warning messages from our 
> UPS, an APC SUA5000 unit - appended.
>
> I am wondering if this is a problem specific to the Science Park here 
> in Cambridge or just us - is anyone else seeing mains voltage getting 
> very high?
>
> I am worried that there's a risk of damage to our systems. Here's a 
> snapshot graph of power measurements; red line is output voltage, 
> green is mains.
> http://www.mansfield.co.uk/misc/ups01.png
>
> I reckon that what's happening is the power demand from the science 
> park varies hugely and affects the grid's ability to regulate voltage, 
> so after 9pm-ish, the mains voltage rises above the UPS's warning 
> margin. According to my cheapo electricity meter we're currently 
> seeing 236V, which is above the norm of 230V
>
> regards
> Paul
>
> -------- Original Message --------
> Subject: UPS: Compensating for a high input voltage.
> Date: Tue, 12 Aug 2008 21:24:12 GMT
> From: **@**
> To: **@**
>
> Name     : ups01.***.***
> Location : **************
> Contact  : **@**
> http://ups01.***.***
> http://##.##.##.##
>
> Serial # : ##########
> Device Ser #: ###########
> Date: 08/12/2008
> Time: 21:24:10
> Code: 0x010D
>
> Warning - UPS: Compensating for a high input voltage.
> _______________________________________________
> CLUG mailing list
> clug at cambridge-lug.org
> Website: http://www.cambridge-lug.org
>