This was originally posted on APC forums on 4/10/2012
This question is about the outpu voltage limit configuration on APC UPSs.
According to the Australian standard, the output voltage can vary between +10% and -6% of rated voltage ( 230 V), which is between 217 and 253 V.
( Australian standard - AS 60038 )
but in the UPS the maximum value I can enter under "output lower limit "
is 208 V.
but, based on the standards, the lower limit should be 217 V.
Can anybody please explain the reason for this.
UPS model - Smart-UPS X 1500
Firmware Revision: UPS 03.7
network card software version - v5.1.6
This was originally posted on APC forums on 4/18/2012
More than 100 reads, not one answer.
I am just an end-user like you, but the min/max voltage range is interesting.
230V minus 6% should be the lowest voltage delivered to your doorstep. Within your installation it could become lower.
I found this:
On 23rd February 2000, a new voltage standard, AS60038, was published in Australia to
replace the previous 240V standard. This requires, under normal service conditions, that the
voltage at the point of supply should not differ from the nominal voltage of 230/400V by
more than plus 10%,-6%.
Voltage drops occur within the customer’s installation due to load. For low voltage
installations, this voltage drop is limited to 5%, in accordance with AS/NZS 3000, therefore
the total range of variation at any point within a customer’s installation is plus 10%,-11%.
With a UPS threshold of -6% it could switch to battery mode too often. Any electrical household appliance should (must?) deal with -10%.
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