OM226142 rev C
43
6.9 THERMAL
COMPENSATION BATTERY CHARGE
It consists of a temperature thermal sensor to be installed in the battery room (or battery
cubicle) in order to detect the operating temperature.
This transducer is able to modify the charging voltage according to the typical curve
supplied from the battery manufacturer. It is normally used for sealed batteries, which are
particularly temperature sensitive.
This type of regulation ensures a proper charging voltage to the batteries in order to
improve their operating life.
Picture 34 – Charging voltage vs. temperature
The temperature sensor is housed inside a plastic tube and already provided with a three-
pole cable that must be connected to an interface card installed next to the UPS’ terminal
board section. The temperature sensor can be installed at a maximum distance of 15
meters from the UPS.
6.10 BOOST
CHARGE
This type of charge, according to DIN41773, is used with vented lead acid (open type) or
Ni-Cd batteries that have a wide voltage range (Pb: 2,2÷2,7 V/cell).
Picture 35 – BOOST charge diagram
In order to design the correct number of cells, the following table shows the voltage limits
of the UPS. The maximum capacity is a function of the maximum recharging current, that
can be found in the technical specification.
