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4.1
BACKFEED PROTECTION DEVICE
The back-feed protection device, as indicated by the EN 62040-1 is provide inside the UPS.
The device is a contactor that automatically disconnects the bypass line in case of failure of
the static switch, in order to avoid voltage feed-back on the input terminals during the a mains
failure.
The use of a device installed inside the UPS allows a higher flexibility of use, as only the
bypass line is cut leaving the rectifier battery charger in operation.
The use of an external device forces the user to separate the UPS supply lines (rectifier and
bypass) if the flexibility and availability of the UPS are supposed to be kept unaltered.
The following table shows the main electrical characteristics of the external sectioning device
in case this solution is chosen.
Maximum operating voltage (Vac)
Minimum rated current (A)
Category
34
OMD39075 REV. F
Installation and start-up of UPS Keor Hp 400-800kVA
Installation et démarrage de l'UPS Keor Hp 400-800 kVA
Installazione e avviamento UPS Keor Hp 400-800kVA
Backfeed protection device
UPS power (kVA)
400
500
600
690
900
1000
1250
AC-1
800
1600
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