Riello UPS Sentinel Dual (High Power) (3.3 - 10 kVA) - Manual (Page 52)

52
U
SE
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ONNECTIONS
INSTALLATION MUST BE CARRIED OUT EXCLUSIVELY BY QUALIFIED PERSONNEL.
THE FIRST CONNECTION TO BE CARRIED OUT IS THE PROTECTION CONDUCTOR (EARTH CABLE), TO BE
INSERTED IN THE TERMINAL MARKED .
THE UPS MUST NOT BE OPERATED WITHOUT BEING CONNECTED TO THE EARTHING SYSTEM.
Warning: if the neutral (N) and phase (F) instructions are observed for the plugs and sockets, the UPS will not
change the existing neutral arrangements when inserted in a system. The resistance on the neutral connection
is less than 0.1 ohm.
A differential switch placed upstream will also be triggered for a fault occurring downstream of the UPS. The
sensitivity of this switch has to take into account the leakage current of the unit (approx. 2 mA) and of the load
which are added together on the UPS earth conductor.
The neutral arrangements will only be changed if an isolation transformer is connected or when the UPS is
operating with the neutral isolated upstream.
Avoid connecting the output neutral to the input neutral or to earth as this could damage the UPS .
For the mains and load connections follow the instructions set out below:
1. Install a 32A magneto-thermal switch with B or C trip curve upstream of the equipment.
2. The terminals to be used for the connection of the input and
output lines are located inside the IN/OUT connections
drawer. Undo the screw securing the connections drawer
located on the right-hand side of the drawer (see figure at
side).
3. Pull the drawer out as much as is needed for the terminals to
be easily accessible (see figure at side). WARNING: the
drawer has a locking system to prevent it being pulled out
completely. Do not try to remove the drawer completely.