I
NTERNAL
T
RANSFORMER
(
OPTIONAL
)
THE
OT
(OPTIONAL) VERSION OF THE UPS SERIES DIFFERS FROM THE STANDARD VERSION IN THAT IT USES AN
ISOLATION TRANSFORMER INSTEAD OF THE BATTERIES.
This series of UPS uses an isolation transformer connected to the UPS output terminals.
NOTE:
A separate bypass line is supplied 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 parallel to the UPS is incompatible with inclusion of the transformer.
In any event, if the remote maintenance bypass is inserted, make sure, at the time the remote bypass switch is
closed, that the UPS is isolated from the system by opening the input and/or output switches.
UPS version with internal transformer is supplied with neutral on secondary circuit
not
connected to earth. It shall be
bind to earth according with neutral arrangement on the site.
ATTENTION:
Manual By-pass change over operation does not insulate the transformer inside which continue to supply
the load; the personnel operating inside the UPS should be aware that under these conditions some part are
subjected to dangerous voltages
