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UPS Extended Overvoltage - should I be worried?

UPS Extended Overvoltage - should I be worried?

UPS Extended Overvoltage - should I be worried?

(OP)
Hi,

we have started getting multiple extended overvoltage messages on the server from our smart UPS 1500 (Powerchute).

I have tried all three sensitivity settings but it hasn't made any difference, so I assume it's not the sensisitvity of the device but likely to be an actual overvoltage issue.

This has only just started to happen, the server / UPs has been in it's urrent;y location for nearly a year without any warnings prior to this.

Should I be worried, I have advised the boss we should get an electrician in to look at it as a wise precaution, but he doesn't seem that bothered.

should we not worry? what is likely to happen if we do nothing, is the UPS just going to annoy me with messages or is there actual potential for hardware damage and failure?

Your advise is appreciated.

1DMF.
 

"In complete darkness we are all the same, only our knowledge and wisdom separates us, don't let your eyes deceive you."

"If a shortcut was meant to be easy, it wouldn't be a shortcut, it would be the way!"

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RE: UPS Extended Overvoltage - should I be worried?

I would be worried, but I like to worry.  I am going to assume you are in the US on 120VAC 60Hz power.  

If you live in an area that is experiencing the current heat wave and power demand is really high, it may be the utility has had to boost voltage somewhat so that customers at the end of the chain maintain adequate voltage and you happen to be at the front of the line getting high voltage.  That would mean typically you would go over-voltage in the middle of the afternoon.

What is "extended"? Is it seconds, minutes, hours?

I would measure your line voltage with a meter or a "Kill a Watt" gizmo (very handy and cheap!).  If you baseline voltage is much over 125VAC then you may have a problem.  It could be that your line voltage is almost at the high transfer point of the ups and just a little increase pushes it over the top.

If you can measure an actual over-voltage event that would be great too. Our power here normally runs between 118 and 120 V.  If it is really hot (as it has been lately it may drop down to around 116).  If it turns out you are just slightly over and you are in the heat wave scenario then I wouldn't worry about it.

A little googling found this table on APC's website:


Transfer points are the input voltages at which the UPS will move between different modes of operation: SmartBoost, On-Line, SmartTrim & On-Battery. These transfer points are user-settable via PowerChute software, PowerNet SNMP or any UPS Remote Management SmartSlot Device.

NOTE: 3.5G=SU700RM2U, SU1000RM2U, SU1400RM2U, 3.6G=all Smart-UPS that                
begin with SUA, 4.0G=(SU2200RM2U, SU3000RM2U), 3G=all others    
            
3G                        3.5,3.6, 4.0G                
120VAC                        120VAC                
Low transfer point 120V                        Low transfer point 120V                
On Line to AVR Boost*    103    100    97    106        On Line to AVR Boost*    106    100    97    103
AVR Boost to On Battery    92    90    87    94        AVR Boost to On Battery    82    77    75    79
On Battery to AVR Boost    94    92    89    97        On Battery to AVR Boost    87    81    79    84
AVR Boost to On Line    112    112    112    112        AVR Boost to On Line    112    112    112    112

High Transfer Points 120V:                        High Transfer Points 120V:                
OnLine to AVR Trim*    132    135    138    129        OnLine to AVR Trim*    127    130    133    136
AVR Trim to On Battery    147    153    158    145        AVR Trim to On Battery    144    147    149    154
On Battery to AVR Trim    142    147    151    140        On Battery to AVR Trim    141    144    146    150
AVR Trim to On Line    125    125    125    125        AVR Trim to On Line    122    122    122    122


RE: UPS Extended Overvoltage - should I be worried?

(OP)
Nope, UK 240 volts and certainly no heat wave, been nothing but rain latelty, not sure we are going to get a summer this year!

I don't have any measuring gizmos and I certainly don't play with electricity. It is highly illegal for any unqualified person to go anywhere near electrics in a commercial environment not to mention dangerous!

My concern is the UPS has been running fine for 8 months in our new offices, then suddenly it's started overvolting!

I shall tell the boss he needs to get an electrician out or risk damage to our IT equipment, if he doesn't, that's his problem!

 

"In complete darkness we are all the same, only our knowledge and wisdom separates us, don't let your eyes deceive you."

"If a shortcut was meant to be easy, it wouldn't be a shortcut, it would be the way!"

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