OMD91046 rev D
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the load. The load is supplied by the mains only if there is an additional failure in the
other units.
Also for the power parallel system, the automatic sharing control of AC current
equalizes the currents of “n” units and reduces the offset to less than 10% under any
load condition.
The load is supplied by the inverters in parallel also in the event of an instantaneous
overload
“n x 150%” of the nominal load of the single unit.
In the event that a failure occurs to one of the units, the load is switched to the
Emergency Line (Bypass), like in the case of a UPS in single configuration.
Picture 31 – Example of UPS units connected in parallel
5.2.10 Connection kit for external battery cabinet
The connection kit is always furnished together with the external battery cabinet (see
paragraph 4.7) and consists of additional terminals and cables which allow the
connection of the UPS to the additional cabinet.
It can be purchased separately in case the external battery is not directly supplied by
BORRI.
5.2.11 Wall mounted isolator with battery fuses
The isolator with battery fuses is used to separate the UPS from the external battery.
The isolator is required in plants where the battery is installed in a dedicated room,
therefore it is necessary to use an isolation device between the UPS and the battery.
It is installed in a separate box and equipped with an auxiliary contact to indicate the
position of the isolator (open-closed) and the fuse status.
5.2.12 Special painting
All the RAL colours can be requested with an additional cost.