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Hi Guys, In IT UPS back up systems is there a general upper voltage rating before the device will compensate for overvoltage or is it down to each manufacturers spec. Have been experiencing reports claiming they have been alerted of overvoltages. This I will need to check out. Many Thanks!
 
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Strima

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Arms
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Depends on the system, some are preset by manufacturers and other can be set by the installer/customer.

I normally set mine to alert from 216 & 253 volts and disconnect <210 & >260 volts.
 
S

Squid

Need more info, make model, is there a clean supply and earth feeding the unit etc etc.

Also how old is the unit as they are known to fail.
 

Pete999

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Arms
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Hi Guys, In IT UPS back up systems is there a general upper voltage rating before the device will compensate for overvoltage or is it down to each manufacturers spec. Have been experiencing reports claiming they have been alerted of overvoltages. This I will need to check out. Many Thanks!
Stick a AVR on the output of the UPs
 
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  • #5
Need more info, make model, is there a clean supply and earth feeding the unit etc etc.

Also how old is the unit as they are known to fail.
I will need to ask for more information tomorrow. They did send me a event list but never quoted any values of voltages before compensating. It was mentioned over the phone that it was 252 v which I said was in limits. This value was not documented in the report they sent. I do know the site has Solar which is what I suspect maybe a start. Thanks!
 

Pete999

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Arms
Esteemed
Hi Guys, In IT UPS back up systems is there a general upper voltage rating before the device will compensate for overvoltage or is it down to each manufacturers spec. Have been experiencing reports claiming they have been alerted of overvoltages. This I will need to check out. Many Thanks!
What size UP s are you speaking of?
 
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An update now is that 2 companies have now experienced where the UPS is compensating or AVR is trimming for overvoltage periods. Turns out that the surge is only apparent in the evening after 10.30pm. They actually said that the alert of overvoltage was new to them & had never experienced it before.To sort the problem I decided to make a complaint to our Network operator regarding the voltages,who are very kindly fitting a voltage monitor in the main switch room , main intake to the business park, tomorrow.If after a week the voltages are 252v max peak then within limits will be the IT support teams problem & higher voltages the DNO’s. Did not think the Electricity Company would be so obliging . Thanks Guys!
 
D

Deleted member 105166

I have had instances where the UPS’ have been the first alert to both an under voltage and over voltage scenario, however noted in both cases that they exaggerated the severity by up to 5 volts. In my experience, these conditions tend to recur at the same time of day, so you can put a calibrated meter on it and take accurate daily min/max readings to verify, to have something concrete to report to the DNO. The DNO will connect a high frequency data recorder for a few days to verify, then tap up or down at the local transformer.
 
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