Yuasa NP Series, Инструкция по установке, использованию и уходу

Страница: 19 / 24

19
12-7/ AUTONOMY TEST (D DAY), SWITCHING THE UPS TO THE BATTERY
a/ Start the chronometer when switching over and carry out as many of the
measurements described in (12-6/) as possible, depending on the number of
technicians available.
b/ Take regular readings, for example every minute for autonomy of 10 minutes.
It should be noted that the voltages of the blocks in the string with the lowest current
must be verified as a priority.
At the end of the discharge, it is normal for the disparity in voltage between the
blocks to accentuate, +/- 10% is possible in relation to the average voltage.
c/ Identify and mark any blocks (using stickers) that heat up in an abnormal manner,
or that have abnormal voltage in relation to previous measurements.
d/ If a block terminal is at an abnormally high temperature (poor tightening), it can be
retightened to the right torque during discharge using a torque wrench.
e/ Ensure that the product of the total battery voltage and total battery current
remains constant an
d close to the battery’s rated capacity.
f/ During this discharge, measure the voltage drop in the cables between the battery
and the UPS. This voltage drop must not be of more than 5V.
g/ When the battery’s voltage is similar to the cut-off voltage, prepare to stop the
chronometer.
h/ Stop the chronometer when the UPS stops with the cut-off voltage. Note this
battery cut-off voltage and verify that this value is the same as the value in the data.
i/ Verify that the autonomy is equal to, or greater than, the value in the data.
It should be noted that if the surrounding temperature is not at 20°C, if the rated
capacity of the batteries is not the same as the values in the data, if the UPS stops at
another cut-off voltage, the expected autonomies must be recalculated with these
new values.