Effekta ACX11MST1K0000XL, Operating Manual

Page: 68 / 77

UPS MTD-XL Maintenance and Service
MTD series 68
11. Maintenance and Service
You may expect a long service life and interference-free operation of your UPS
at a minimum of maintenance effort.
However, the reliability of the UPS is greatly dependant on the ambient condi-
tions. The ambient temperature and humidity must remain within the given
range. In addition, the area around the UPS should be kept clean and free of
dust.
At an ideal ambient temperature of about 22°C, the service life of the accumu-
lators
is typically around 4 years. Through the use of special
accumulators the service life can be significantly increased (about 8-10 years).
You should check periodically (every 6 - 12 months) whether the remaining
backup time is sufficient for the intended purposes. Once that is no longer the
case, the accumulators have to be replaced.
11.1 Measuring the backup-time (support time)
Before you begin this procedure, please make sure to save all open data.
Furthermore, inform all affected employees.
Basically there are two different methods for measuring the back-up time.
Method a)
measures the actual back-up time, which means that at the end of that
backup time the appliances would be without a power supply.
Method b)
allows to determine the residual capacity after a defined backup-period.
In this case the appliances will usually not be without power in the end.
To use either method, you have to force the UPS into backup mode, by
simulating a mains failure (e.g. trip the fuse of the building). Do not, un-
der any circumstances, remove the mains connection, as that would also
disconnect the protective earth conductor. After the measurement has
been carried out, turn the circuit breaker back on and turn on the UPS as
usual, with the ON-button.