12. Maintenance and service
You can expect a long service life and interference-free operation from this
product. The service life and reliability of the UPS is greatly dependent on the
conditions of its environment. The ambient temperature and humidity in the vi-
cinity of the device must remain within the specified range. In addition, the area
around the UPS should preferably be kept clean and free of dust.
At an ideal ambient temperature of approximately 20-25°C, the service life of an
accumulator is typically about 4 years. An increased ambient temperature
(greater than 25°C) can significantly reduce the service life of the accumulators,
resulting in invalidating the warranty. The service life can be considerably in-
creased with the use of special accumulators (up to ca. 8 years). It should be
regularly checked (6-12 months) whether the remaining autonomous time (sup-
port time) is sufficient for the intended purposes. Should this no longer be the
case, the accumulators will have to be replaced.
12.1 Measuring the support time (autonomous time)
Before beginning with this procedure, it is obligatory that all open databases
must be secured. Also, inform all involved employees of your intentions in case
sensitive loads are connected to the UPS.
There are essentially two methods to measure the support time.
Method a) is suitable for measuring the actual back-up duration whereby the
loads are required to be currentless at the end of the autonomous time. To this
end, force the UPS to return to the autonomous mode and measure the time un-
til the automatic shutdown of the UPS.
Method b) allows for the determination of the remaining capacity after a defined
support period. For this method as well, first force the UPS into the autonomous
mode for a specific time. As it returns to the supply mode, record the remaining
capacity. Then calculate the autonomous time through an estimation (linear).
Please remember that after measuring the autonomous time, the accumulator of
the device is partly or possibly fully discharged. This means that the UPS must
remain operating in standard operation mode for several hours (min. 6 h) to re-
charge the battery bank accordingly before the UPS is approximately 90 % op-
erational (capable of supporting). This information only pertains to the internal
battery bank.
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