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Symmetra® MW with Internal Bypass Static Switch - User Guide - 990-1756A-001 31
Operation Modes
On-line Operation
During on-line operation, the critical load is supported by the inverters. The main inverter controls
the output voltage and the delta inverter controls the input current. The delta inverter also provides
battery-charging current. While the UPS is running in this mode, 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.
CAUTION!
Do not open Q2 when the UPS is in on-line operation, as this action may result in a load
drop or a failure of the UPS to support the load.
Breaker Identification
Q1 UPS input breaker Q5 Static bypass input breaker
Q2 UPS output breaker Q7 Battery breaker 1
Q3 Manual bypass breaker Q8 Battery breaker 2
Note
Only operate a breaker when the associated breaker lamp is on.
Battery
Main inverterDelta inverter
Bypass Static Switch