PowerWalker Battery pack for VFI 10000P_RT LCD - Manual (Page 33)

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6) Turn on the input breakers for the two parallel UPS.
7) Pressing button continuously for more than 1 second for
one UPS of the system, then the system will start to turn on and
enter line mode.
8) Regulate the output voltage of the each UPS separately, and
check if the output voltage difference between the two ups is
less than 0.5V. If the difference is more than 0.5V, the UPS
need to be regulated.
9) If the difference output voltage is less than 0.5V, switch on the
output breakers for the two UPS separately and switch on the
main O/P breakers, then the system will work normally in
parallel.
■ The output wiring requirement as follows:
● When the distance between the UPS in parallel and the
breaker panel is less than 10 meters, the length difference
between input and output cable of the UPSs is required to be
less than 20%.
● When the distance between the UPS in parallel and the
breaker panel is more than 20 meters, the length difference
between input and output cable of the UPSs is required to be
less than 5%.
How to join a new UPS to a parallel system:
1) Firstly a main maintenance mechanical switch or static switch
should be installed for the parallel system.
2) Regulate the output voltage of the new UPS: 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”, then press the button to turn off
the UPS, then UPS will work in bypass mode.