PowerWalker VFI 6000T LCD - Manual (Page 44)

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6.2 Converter Function
6.2.1 Brief introduction of Converter function
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.
The great virtue is the output frequency is fixed, which is required by
some very sensitive loads.
But the disadvantage is the load capacity of UPS should be derated
to 60% in converter mode.
6.2.2 Set the function
The function could be enabled through the LCD setting in Bypass
mode.
Enter the power strategy setting menu by following chapter of 5.4.7.
6.3 Parallel Function
6.3.1 Brief introduction of the redundancy
N+X is currently the most reliable power supply structure. N
represents the minimum UPS number that the total load needs, X
represents the redundant UPS number, i.e. the fault UPS number
that the system can handle simultaneously. When the X is larger, the
reliability of the power system is higher. For occasions where
reliability is highly depended on, N+X is the optimal mode.
As long as the UPS is equipped with parallel cables, up to 4 UPSs
can be connected in parallel to realize output power sharing and
power redundancy.