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Installation Guide APC Silcon 480kW 400V UPS 11
4.2 System Integration Interface
System Integration Interface (SII) is the control link between UPS and system main switches
as shown in above diagram. The purpose of the SII is to ensure correct operation of switches
without losing system output power.
Auxiliary contacts on the main switches transmit the SII board inputs. Lamps on Service
Bypass Panel and Battery Breaker Box/Battery Cabinet indicate “green light” for operation of
output switches.
SII board also integrates input facilities for emergency shut-down and temperature
compensation of charge voltage for external battery (use with battery monitor). “Battery
operation” and “Common fault” are two main SII board status relay signals.
NOTICE!
Consistent use of designations (Q001, Q002, Q003, H002, H003) in diagrams simplifies
information exchange.