PowerWalker VFI 1000 LE - Manual (Page 4)

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1.2 Mode description
Bypass mode
Bypass mode means that the UPS provides the power through the internal
bypass way to load directly without any regulation. If the controller detects the
mains is abnormal, it will shut off the output to protect the load. The bypass
voltage/frequency range and default output status (on/off) could be set by
communication software.
Line mode
Line mode means that the mains input is rectified/converted by the AC/DC
section and then inverted to stable output by DC/AC section. In line mode,
the output is clean and good to the loads. If the mains get abnormal, the UPS
will transfer to battery mode without interrupt.
Battery mode
Battery mode means that the battery power goes through the DC/DC section
to the inverter (DC/AC) and get a stable backup output when the mains input
is not usable. If the mains input recovered, the UPS will transfer to line mode
without interrupt.
Battery test mode
In this mode, the UPS will stop the AC/DC section and discharge the battery
while mains input is normal. If the controller found the battery is error, it will
transfer back to line mode immediately, and warning by display to see
whether the battery needs to be replaced. The battery test mode could be
trigged in line mode by pressing the button or by the communication
command.
Fault mode
If the UPS generates some internal failure and have to stop its inverter, it will
go into fault mode and alarm by display and buzzer.
In fault mode, the loads have the risk of power loss because the output will
come from the bypass after UPS fault.