PowerWalker VFI 1000T LCD - Manual (Page 24)

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The UPS does not have the backup function when it is in bypass
mode. The power used by the load is supplied from the utility power
via internal filter.
6.4 NO output mode
The LCD display in No output mode is shown in the following
diagram. The information about the utility power, the battery, the UPS
output and the load could be displayed. The “0” code indicates the
UPS is working in the No output mode.
■ ■ ■ ■
The Bypass mode
■ ■ ■ ■
The No output mode