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4.3
Backfeed protection
The CPS is provided with a device to prevent voltage backfeed on the input line due to an internal fault. This
protection device works by switching off the inverter if the current flow is faulty, thereby causing voltage backfeed on
the by-pass line during operation from the inverter. If the fault occurs when the CPS is operating from the battery, the
load will not be powered.
Should it be required to avoid the shutting down of the inverter in order to keep the load powered by the inverter even
in the event of a double fault, the system can be customized to control the opening coil of a switch located CPStream by
reprogramming one of the relays on the “REMOTE COMMANDS AND ALARMS” card.
The control logic allows the function of the relay to be reconfigured, for example for the backfeed alarm, and then the
free voltage contact can be used to control the triggering of a switch located on the CPS input.
4.3.1 Emergency power off device (EPO)
The CPS is pre-set to be connected to a remote emergency power off device as laid down in standard EN 62040-1-2. If
the remote device (not supplied with the equipment) is activated, the inverter output voltage is cut.
The connection procedure is shown below.
a - EPO terminal board located on the CPS
b - EPO switch (not provided).
On the CPS , the jumper on the EPO terminals (page 16) 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.
UPS
a
b
Summary of Contents for C3T
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