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Remote maintenance Bypass
An additional maintenance bypass may be installed within (or in addition to) the main switchboard, for example, to
enable the UPS to be replaced without interrupting the power supply to the load, in this case respect the following
details:
It is mandatory to connect the "SERVICE BYPASS" terminal (see the “Installation Manual”,
"Programmable IN – OUT signals" paragraph) to the NC auxiliary contact of the SERVICE BYPASS
switch. Closing the SERVICE BYPASS switch opens this auxiliary contact which informs the UPS
that the maintenance bypass has been activated. If this connection is not present, the power
supply to the load may be switched off and the UPS damaged.
NOTE
:
Use cables with a cross sectional area that conforms to the indications given in "POWER CONNECTION
INFORMATION" paragraph of the Installation manual.
Use a double insulated cable with a cross section of 1mmsq to connect the "SERVICE BYPASS" terminal to the
auxiliary contact of the remote maintenance bypass disconnect switch.
Whenever the UPS is equipped with an internal isolation transformer, check the compatibility between the
“remote maintenance bypass” and the neutral arrangement within the electrical installation.
DIAGRAM SHOWING REMOTE INSTALLATION OF THE MAINTENANCE BYPASS (S3T MODEL)
Main switchboard
Internal connections of the UPS
Programmable IN/OUT port (to be configured via the configuration software)
INPUT switch: for correct sizing refer to the "Internal Protective Devices” paragraph
OUTPUT switch: for correct sizing refer to the "Internal Protective Devices” paragraph, equipped with a
normally closed auxiliary contact
SERVICE BYPASS switch: for correct sizing refer to the "Internal Protective Devices” paragraph, equipped
with a normally closed auxiliary contact
