PowerWalker VFI 10000TCP 3_1 - Manual (Page 47)

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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 1V, 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.
13) Press the button of one UPS, each UPS would start to turn on,
after turning on, the UPSs should work parallel in the Line mode.
How to join a new UPS to a parallel system:
1) First the parallel system must be installed one main maintenance
mechanical switch or static switch.
2) Regulate the output voltage of the new UPS separately: check if
the output voltage difference between the new UPS and the
parallel system is less than 0.5V.
3) Ensure the bypass of the parallel system is normal and the bypass
setting is “enable”, remove the cover plate of maintenance switch
on the rear panel of each UPS, the UPS system would transfer to
bypass automatically, For PowerWalker VFI 10000-20000TP 3/1,set
the own maintenance switch of each UPS from “UPS” to “BPS”. For
PowerWalker VFI 10000TCP 3/1 model, turn the maintenance
switch in the “ON” position, and turn the output switch in the “OFF”
position.