Service manual

Always On UPS Systems
M0704_NX_Series_Service_Manual V2.17 2012-06-12 74
30. STATIC SWITCH
This is a pluggable module, which is either part of the Rectifier Module (for the 10kVA to 60kVA UPS systems) or a
separate module (80kVA to 160kVA UPS systems) containing the high power devices for the static switch. The static
switch monitors the inverter and output. If a condition occurs (inverter shutdown or problem condition), it will transfer the
output from the inverter to the reserve path automatically. When the condition has been cleared, the static switch will
automatically transfer power from the reserve path to the inverter.
One phase of the static switch is comprised of a Static Switch Control PCB (3P PCB), high powered, naturally
commutated SCRs and other monitoring and protecting components.
RECTIFIER STATIC SWITCH MODULE
Figure 30.1
Location of Static Switch Module in the 10kVA to 60kVA UPS system