PowerWalker VFI 6000T LCD - Manual (Page 27)

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2) It is attention that the transfer time of UPS output from HE
mode to battery mode is about 10ms. But it is still too long for
some sensitive load.
5.2.6 Converter mode
In converter mode, the UPS would free run with fixed output
frequency (50Hz or 60Hz). Once the mains power is loss or
abnormal, the UPS would transfer to battery mode and the load is
supplied continuously.
Fig. 5-8 Converter mode
1) The function could be enabled through the LCD setting or the
software (Winpower, etc.).
2) The load should be derated to 60% in converter mode.
5.2.7 Warning
When the warning occurs, it illustrates that there are some
abnormal problems during the operation of UPS. Normally the
problems are not fatal and the UPS continues working, but they
should be paid attention to, or the UPS may fail.
The detailed warning table is shown in chapter of 7.