PowerWalker Battery Pack for VFI 1000RT LCD - Manual (Page 31)

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6.7 Converter mode
In converter mode, on LCD display, the mode string is “CVCF”.
The UPS would free run with fixed output frequency (50Hz or 60Hz) in
converter mode. Once the mains is loss or abnormal, the UPS would transfer
to battery mode and the load is supplied continuously by the battery.
1) It could be enabled through the LCD setting or the software (Winpower,
etc.).
2) The load should be derating to 70% in converter mode.
6.8 Abnormal mode
In abnormal mode such as Bus fault etc., the corresponding fault string would
be shown to indicate the operating mode of the UPS, and the background light
become red. For example “SHOR” would be shown when the load or the UPS
output is short. The LCD display is shown in the following diagram.