Remember that the accumulators of the system are discharged after the
measurement, which means that the UPS system must work for a few hours
(at least 5 hours) in the mains and charging operation before it is ready for use
again at approx. 80 %.
If the measurement of the support period is not carried out due to local condi-
tions or directives, we recommend a prophylactic replacement of the accumula-
tors every two years to avoid the risk of an insufficient support period on ac-
count of degenerated accumulators.
11.2 Replacing the Accumulators
Before you begin with this procedure, please regard the listed safety in-
structions. Carry out the work in the stated sequence. Be sure to use
safety tools. Before beginning work, make sure that the UPS is switched
off and separated from the supply mains.
Only professional staff may perform work on the accumulator bank. They
must be specially trained in the handling of accumulators.
It must be considered that high voltage is still present in a shut-off de-
vice. This includes e.g. the voltage of the accumulator bank, charging
voltage of mains capacitors. Appropriate safety measures are to be taken
against electrical shocks.
In this manual, the replacement of accumulators is not described in more
detail due to the aforementioned dangers.
For appropriate professional staff, a separate description is available up-
on request.
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