3.2.6 System Power-off
After turning off the inverter, place the mains switch and the bypass
switch 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. If the UPS is
connected to external battery, place the switch of the external
battery to OFF. 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 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 be less than 3, otherwise, the UPS will remain in
Bypass mode for 1 hour before it transfers back to Normal mode.
Chapter 3 Operation 33
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