the UPS stops running. About 30 seconds later, the auxiliary supply
shuts off, all panel indicators go off, and the fan stops running.
3.2.5 System Power-off
1. After turning off the inverter, pull off the system input plug, or
place the switch of the wall socket or the distribution switchboard to
OFF, all panel indicators go off, and the fan stops running (if there is
a battery, a delay time of 30 seconds is needed before the fan
stops). Up to now, the system is powered off.
2. If the UPS is connected to external battery, place the switch of the
external battery to OFF.
3. After system power-off, the UPS has no output to supply the load.
3.3 Auto Transfer Between UPS Operation Modes
In normal case, user should set the UPS to Normal mode. When
operating in Normal mode, in the event of mains failure, the UPS
automatically transfers to Battery mode without interruption to load;
in the event of overload, the UPS automatically transfers to Bypass
mode without interruption to load; in the event of inverter fault or
internal overtemperature, the UPS operates in Fault mode.
3.3.1 Transfer to Bypass Mode in the Event of Overload
When the UPS remains overloaded for a specified time, the UPS
transfers from Normal mode to Bypass mode, and meanwhile gives
audible alarm every 0.5 second. In such case, the UPS output is
mains voltage. At this time, some loads should be disconnected until
the alarm stops and the yellow load indicator on the front panel goes
off, and 5 minutes after that, the UPS automatically transfers back to
Normal mode. To protect the load and UPS, the transfer times within
1 hour from Normal mode to Bypass mode due to overload should
30 Chapter 3 Operation
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