Backfeed Protection Device - LEGRAND Keor Hp Series Installation And Startup

Installation and start-up of UPS Keor Hp 200-300kVA
Installation et démarrage de l'UPS Keor Hp 200-300 kVA
Installazione e avviamento UPS Keor Hp 200-300kVA
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.
UPS power (kVA)
Maximum operating voltage (Vac)
Minimum rated current (A)
Category
Backfeed protection device
200 250 300
690
450 550 650
AC-1
OMD36055 REV. D 27