Riello UPS MASTER HP-UL Series, Руководство пользователя

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When operating in the presence of mains supply, a GFCI installed on the input will trip as the output circuit is
not isolated from the input circuit.
When operating without mains supply (from battery) the input GFCI will trip only if it is able to switch as a
result of leakage current without any voltage at its poles (for example a GFCI with an auxiliary relay is not
suitable). However, it is possible to install additional GFCIs on the output of the UPS, coordinated with those on
the input.
5.3.2 Backfeed protection
The UPS is provided with a redundant device to prevent voltage backfeed on the by-pass input line due to an
internal fault. This protection device works by switching off the inverter if a voltage backfeed on the bypass
occurs caused by the flowing of a fault current. If the fault occurs when the UPS is operating from the battery,
the load will not be powered.
The control logic allows the function of the relay to be reconfigured, for example for the backfeed alarm, and
then the dry contact can be used to control the triggering of a switch located on the UPS input.
5.3.3 Emergency power off device (EPO)
The UPS has an EPO (Emergency Power Off) function.
In the event of an emergency using this function the UPS shuts down the rectifier, inverter, static switch and
completely disconnects the power to the load.
The Output circuit of the UPS should not be considered safe, unless the UPS is Off and the input power source to
the UPS has been removed by opening the input disconnect devices which are external to the UPS, including the
battery.
This function can be activated from the button (under a hinged clear plastic cover) on the control panel or by a
remote contact. This button must be depressed and held down until the UPS shuts down.
To connect an external EPO to the remote contact follow this procedure.
a - EPO terminal board located on the UPS
b - EPO switch (not provided).
On the UPS, the jumper on the EPO terminals must be removed, and the wires from the auxiliary contact of the
button must be connected in place of the jumper.
The contact must be normally closed and must open when the button is pressed.
UPS
a
b