Apc SYMMETRA 990 User Manual download pdf (Page 12)

Operation: Operation Modes

8 Symmetra MW with External Bypass Static Switch Operation Manual - 990-1377D-001

Static bypass operation

During static bypass operation, the critical load is supplied directly by utility power. A single-line

diagram will appear on the screen with an orange line indicating the power flow through the External

Bypass Static Switch (SSW) to the load.

Manual bypass operation

During maintenance bypass operation, the critical load is supplied directly by utility power. Maintenance

bypass allows the UPS units to be isolated for maintenance purposes. In maintenance bypass there is no

backup from the UPS system to the load. While the UPS system is operating in this mode, a single-line

diagram will appear on the screen with an orange line indicating the power flow from the utility to the

load through the Q3 breaker.

Main Inverter

Delta Inverter

Battery

External Bypass SSW

Main Inverter

Delta Inverter

Battery

External Bypass SSW

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