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0MLMHTK65RUENUB
1.1.5
Backfeed protection
The UPS is provided with a redundant device to prevent voltage backfeed on the input line due to an internal fault.
This protection device works by switching off the inverter in case of the fault current on the bypass line during
operation from the inverter. 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 configured, for example for the backfeed alarm, and then the
dry contacts can be used for triggering a switch located on the UPS input.
1.1.6
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 closed with the button in the rest position and must open when the button is pressed.
Mains, load and battery connections
Input line without neutral
A transformer must be inserted either on the mains supply line or on the bypass line (as shown in the drawings) if
the load requires a neutral.
UPS
a
b
