UPS: Compensating for a high input voltage.

[Paul M]

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.