Service manual

Always On UPS Systems Inc

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