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24 Installation Guide APC Silcon 240-320kW 480V UPS
990-4049
External Connection
4.2 System Integration Interface
Single Utility
Dual Utility
System Integration Interface (SII) is the control link between UPS and system main switches
as shown above. The purpose of the SII is to ensure correct operation of switches without losing
system output power.
NOTICE!
Refer to chapter 4.1.5 Changing from dual to single utility input
WARNING!
Even with all AC and DC sources switches off, SII may receive high voltage from external alarm
and signal circuit field wiring.