Emerson GXT2-PP20KRT208 - Manual (Page 29)

Operation
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8.9 Battery Low Voltage—Battery Mode
See the following conditions when the battery low voltage is detected in the paralleling system.
• If one UPS battery is running low, it will transfer to Output Off Mode. The other UPSs continue
to supply power to the load.
• If all UPS batteries are running low, the devices will transfer to Output Off Mode and shut down
simultaneously. When utility power returns, the paralleling system will restart automatically.
• If one UPS battery is running low and the rest are overloaded in Battery Mode, each UPS in the
system shuts down simultaneously without the overload fault. When utility power returns, the
paralleling system will restart automatically and return to Line Mode.
• If the last UPS encounters the overload condition, it will transfer to Bypass Mode or shutdown
depending on the bypass condition.
• When the bypass is good, each UPS in the paralleling system will transfer to Bypass Mode.
• When the bypass is abnormal, every UPS in the paralleling system will shut down.