G-Tec ZP120LCD, User Manual

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6.5 Abnormal mode
In abnormal mode such as Bus fault etc., the corresponding fault
code would be shown to indicate the operating mode of the UPS.
And some warning words could also be shown, for example “short!”
would be shown when the load or the UPS output is short and the
UPS is in inverter fault mode.
6.6 EPO mode
In EPO mode, the buzzer will beep once every second and the UPS
can turn to bypass mode by pressing "OFF" only if the EPO pin is
disable.
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The EPO mode