53
I
NTERNAL TRANSFORMER
THE
OT
(OPTIONAL) VERSION OF THE UPS SERIES DIFFERS FROM THE STANDARD VERSION IN THAT IT INCLUDES AN
ISOLATION TRANSFORMER INSTEAD OF THE INTERNAL BATTERIES.
This series of UPS (available only in a dedicated chassis of the XTD version), is equipped with an isolation transformer connected to
the UPS output terminals.
NOTE:
A Dual Input line is present as standard on this UPS version.
The transformer is connected to the UPS output terminals, so the values displayed are those of the quantities measured
upstream of the transformer.
The presence of the transformer inside the UPS modifies the system neutral arrangements.
The installation of a remote maintenance bypass switch which is parallel to the UPS is incompatible with the inclusion
of the transformer. In any event, if the remote maintenance bypass is inserted, make sure, at the time when the remote
bypass switch is closed, that the UPS is isolated from the system by opening the input and/or output switches.
The UPS version with an internal transformer is supplied with a neutral on the secondary circuit which is NOT connected
to earth. It must be bound to earth according with the neutral arrangements on the site.
Transformer Vector Group is YNyn0.
ATTENTION:
Manual By-pass changeover operation does not isolate the transformer inside the UPS and so it will continue
to supply the load; All personnel operating inside the UPS should be aware that under these conditions some
part are subjected to dangerous voltages.
For parallel operation of this UPS version please refer to local sales department.
