APC UPS output voltage

Durzel · 6 Oct 2008 at 17:04

I've been running a APC Smart-UPS for a while but I've only just noticed that the output voltage is set to 230V. Looking at the stats for the input voltage it says 249.1 VAC (which sounds a bit high).

Anyone know what I should be using, or have any experience of configuring these? From looking at the options for output voltage on "Line Transfer" it says I can choose 220, 230 or 240V. Intuitively it sounds like it should be set to 240V, but my PC & equipment has been running fine for months as it is?

Some relevant output:

Code:

        Input Voltage    : 249.1 VAC         Operating Frequency : 50.00 Hz
        Output Voltage   : 249.1 VAC         Internal Temperature: 031.0 C
        Load Power       : 011.7 % Watts     Battery Voltage     : 27.40 VDC
        Max Line Voltage : 249.1 VAC         Battery Capacity    : 100.0 %
        Min Line Voltage : 246.2 VAC         Runtime Remaining   : 0103 min

Code:

        UPS Name       : VORNIZ            Battery Date         : 01/11/05
        -----------------------------------------------------------------------
        Output Voltage : 230 VAC           Shutdown Delay       : 090 sec
        High Transfer  : 253 VAC           Return Delay         : 000 sec
        Low Transfer   : 208 VAC           Low-Battery Duration : 002 min

EsaT · 6 Oct 2008 at 18:35

Durzel said:
Looking at the stats for the input voltage it says 249.1 VAC (which sounds a bit high).

Line-interactive UPS gives out what it gets in except when running on battery.
Apparentlly while UK has officially moved to 230VAC old 240VAC is still commonly used... and that's also well inside operating voltage limits of any 230VAC appliance. Now I don't believe that outlet would actually give overvoltage so that extra 9.1V might come from measuring errors.
Do you have multimeter which you could use for checking voltage?

Compared to MGE sinewave UPS I have that "High transfer" voltage probably means voltage where UPS opens mains relay and switches to battery operation and "Low transfer" same for under voltage. (although I would think it can also boost/lower mains voltage withotu use of battery)
And looks like power draw is 11.7% of UPS's output capacity.

decto · 6 Oct 2008 at 18:40

Most modern PC power supplies are self regulating switched mode and can take an input voltage of 90 - 260 volts AC without any issue to allow for worldwide usage.

AD

Xerai · 10 Jan 2018 at 10:46

Durzel said:

Code:

        UPS Name       : VORNIZ            Battery Date         : 01/11/05
        -----------------------------------------------------------------------
        Output Voltage : 230 VAC           Shutdown Delay       : 090 sec
        High Transfer  : 253 VAC           Return Delay         : 000 sec
        Low Transfer   : 208 VAC           Low-Battery Duration : 002 min

Im trouble shooting an issue with my UPS at the moment and Im reading through threads around the net that discuss the UPS low/high transfer settings for the UK. My UK UPS was setup by default as low 208v (the same as you), but from what I understand of the british standard this value should be at least 216v (230v -6%). I guess there is a reason these UPS are being set to default that low, but it seems a bit odd
NB: A high transfer of 253v is spot on the british standard value (230v +10%)

EsaT · 10 Jan 2018 at 18:49

Xerai said:
Im trouble shooting an issue with my UPS at the moment and Im reading through threads around the net that discuss the UPS low/high transfer settings for the UK. My UK UPS was setup by default as low 208v (the same as you), but from what I understand of the british standard this value should be at least 216v (230v -6%). I guess there is a reason these UPS are being set to default that low, but it seems a bit odd
NB: A high transfer of 253v is spot on the british standard value (230v +10%)

Active-PFC PSU doesn't give a damn if voltage drops even to 150V.
Because they're built to operate down to 100V to work in US...