PowerWalker VFI 1000 LE - Manual (Page 20)

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the UPS will be turned on to the battery mode and output the spec
voltage.
3) After the UPS is turned on to battery mode normally, both the Inverter LED
and Bypass/Battery LED will be on. The Load/Battery level LEDs will be
lightened according to the battery capacity. The buzzer will beep according
to the battery level.
3.4 Connect loads to UPS
After the UPS is turned on, you can switch on the loads.
1) It is recommended to switch on the load one by one. The Load/Battery
level LED will indicate the load capacity in line mode.
2) If it is necessary to connect the inductance load such as a printer to the
UPS, the start-up power should be considered for calculating the
capacity of the UPS, because the power consumption is too big when
this kind of load is started.
3) If the UPS is overloaded, all the load level indication LEDs will flash and
the buzzer will beep twice every second for alarming.
4) If the UPS is overloaded, some loads must be switched off or decreased
immediately. It is recommend that the total loads connected to the UPS
had better be less than 80% of its nominal power capacity to prevent the
overload happen at the transient time, and it will make your system more
safe.
5) If the overload time is over spec in line mode, the UPS will transfer to
bypass, after the overload disappears, it will return to line mode. If the
overload time is over spec in battery mode, the UPS will cut off the
output and then shutdown according battery level.