15
Notice:
It is required to install an external isolating device against current
backfeed between Mains input and UPS. After the device is installed, it
must add a warning label with the following wording or the equivalent on
the external AC contactor: RISK OF VOLTAGE BACKFEED. Isolate the
UPS before operating on this circuit, then check for hazardous voltage
between all terminals. The current rating of T - AC contactor should be
more than 1.3 times of UPS capacity
MAIN INPUT
UPS
B
Q
T
L
N
B coil remote switch
Q input main switch
T AC contactor
L line input
N neutral
MAIN INPUT
UPS
B
Q
T
L1
L2
L3
N
B coil remote switch
Q input main switch
T AC contactor
L1 L2 L3 line input
N neutral
Fig.3-2 Typical external isolating device installation
3.3.2 UPS Wiring Connection
To make the mains power and load connections, follow the instructions
below:
Single phase input
Three phase input
