PowerWalker VFI 1000T LCD - Manual (Page 26)

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2) The load should be derating to 60% in converter mode.
6.8 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.