APC SYMMETRA 990 User Manual Page 11

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7Symmetra MW II with Internal Bypass Static Switch - Operation - 990-1756C-001
Operation
Operation Modes
Normal operation
During normal operation, the critical load is supported by the inverters. While the UPS is running in
normal operation, a single-line diagram will appear on the screen. The green line indicates the power
flow from the utility supply through the UPS to the load.
Battery operation
During battery operation, the critical load is supported by the inverters. The main inverter is supplied by
battery power, ensuring uninterrupted support to the load. While the UPS is operating in battery
operation, a single-line diagram will appear on the screen. The green line indicates the power flow from
the batteries through the main inverter to the load.
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