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44 Installation Guide APC Silcon 240-320kW 480V UPS
990-4049
External Connection
4.8.2 Emergency Power Off (EPO) for UPS
UPS systems installed in a computer room MUST have external batteries with EPO trip-
function in Battery Breaker Box and in switch gear.
System Configuration for Dual Utility
Dual Utility Matrix
DC Utility 2 Utility 1 Possible UPS operation
modes
Tripping
Supply
Note
0 0 0 Off 0 Nothing to trip
0 0 1 X Under
installation only
0 1 0 Bypass operation only 1
0 1 1 Bypass operation only 1
1 0 0 Battery operation only 1
1 0 1 Normal/battery operation 1
1 1 0 Bypass/battery operation 1
1 1 1 Normal/bypass/battery
operation
1
Q2
Q3
Q10
Q1
User-supplied external PSU
for tripping of battery breakers
in external battery cabinet or
battery room and switch gear
switches.
Output
Utility 1
External DC
Input
Utility 2
Input
Load
UPS