UPS
MH6000
Manual
MH Series
Page 45 of 51
12 Maintenance and service
It can be seen as fact that the UPS has got a long service life and an
undisturbed function, with regard to a minimum maintenance. But the liability of
the UPS depends of the environmental conditions. Temperature and humidity
in the environment of the UPS have to be within the indicated limit.
Furthermore the area around the UPS should be clean and not very dusty. The
typical life service of the batteries is about 4 years, when the environmental
temperature is 22°C. Using special batteries, the life service can be increased
significant (about 8-10 years).
Please check regularly (6-12 months) that the rested autonomy time is
sufficient. If it is not, the batteries have to be exchanged.
12.1 Measurement of the autonomy time
Before starting this procedure, you should store all data. Also inform all involved
users.
There are two methods to measure the autonomy time. Method a) is suited for
the measurement of the real autonomy time, whereas at the end of the
autonomy time the user loads will be currentless.
Method b) enables to detect the rested capacity after a defined autonomy
period. During this method the user loads generally will not be currentless.
To employ one of those methods, you have to force the UPS into autonomy
time by switching-off the automatic breaker of the UPS.
After measurement switch the automatic breaker on and start up the UPS as
usually.
Notice that after measurement the batteries of the unit are unloaded. Therefore
the UPS has to be in power supply or loading operation (min. 5 h), before it is
serviceable to 80 %.
If measurement is not possible, due to local conditions or directives, we
suggest exchanging the batteries prophylactically every 2 years, to avoid the
risk of a not sufficient autonomy time because of low batteries.
12.2 Exchange of the batteries
Before starting this procedure, respect the mentioned security advices. Proceed
in the indicated sequence. Just use isolated hand tools. Before starting, assure
that the UPS is switched-off and disconnected to the mains supply.
