OMD10078 rev F
44
5.2.1 Thermal compensation of battery charge
This option provides a temperature sensor to be installed near the battery room in
order to detect the operating temperature. This transducer is able to interface with the
control logic of the rectifier in order to modify its floating voltage based on temperature,
according to the typical curve supplied by the battery manufacturer. It is normally used
for sealed batteries, which are particularly temperature sensitive.
The temperature measured by the probe can be visualized on the front display. If it is
outside the limits set with the software, the UPS will activate an alarm.
Picture 33 – Charging voltage / temperature curve
The temperature sensor installed is provided with a connection cable that must be
connected to an interface card installed in the UPS’ terminal board section. The
temperature sensor can be installed at a maximum distance of 15 meters from the UPS.
5.2.2 Bypass insulation transformer
It is used when the input line is without neutral, or the galvanic isolation between the
mains and the loads is required.
During normal operation the inverter transformer provides for this task, while during
the bypass condition the mains feeds the load directly. Generally the insulation
transformer is used when the output neutral conductor must be different from the input,
thus discriminating two different grounding systems.
5.2.3 Voltage adaptation transformers
A voltage adaptation transformer can be connected at the UPS output terminals to
adapt the standard output voltage to the value requested by the loads. It can also be
connected at the input terminals to adapt the actual mains voltage to the values defined
in the technical specification. In case the galvanic isolation is not required an auto-
transformer can be used.
