PowerWalker VFI 6000T LCD - Manual (Page 47)

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Fig. 6-2 Parallel System Installation Diagram
10) Do not switch on the output breaker of each UPS, switch on the
input breaker of the each UPS, the UPS should work in bypass
with output, observe their display to check if there are any
warning or fault information, measure the output voltage of
each UPS separately to check if the voltage difference between
them is less than 1V. If the difference is more than 1V, check
the wiring.
11) Press the button of one UPS, each UPS would start to turn
on, all the UPSs would transfer to the INV mode together.
Measure the output voltage of each UPS separately to check if
the voltage difference between them is less than 0.5V. If the
difference is more than 0.5V, the UPSs need to be regulated.
12) Press the button of one UPS, each UPS would start to turn
off and transfer to the Bypass mode, switch on the output
breaker of each UPS to parallel all the output of UPSs together.