PowerWalker VFI 10000 RTG, User Manual, Page: 26 / 59

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in parallel system, 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 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 auto bypass
setting is “enable”, then press the button to turn off the UPS, the UPS
will turn to bypass mode.
4) Set the main maintenance switch or static switch from “UPS” to “BPS”, then
switch off the main output breaker, input breaker and mains breaker, then
the UPS will shut down.
5) Connect the cable and wire for the new ups.
6) Switch on the input breakers and mains breaker, and make sure that every
UPS work in bypass mode.
7) Switch on the O/P breakers and main O/P breaker
，
transfer the main
maintenance switch or static switch from “BPS” to “UPS”.
8) Press the button of one UPS, all the ups will turn on, after that, the
system will work in Line mode.
How to remove a single UPS from parallel system:
1) Firstly, a main maintenance mechanical switch or static switch should be
installed for the parallel system.
2) Ensure the bypass is normal and the auto bypass setting is “enable”, press
the button to turn off the UPS system, and the UPS system will turn to
bypass mode.
3) Transfer the main maintenance switch or static switch from “UPS” to “BPS”,
then switch off the output breakers, input breakers and mains breaker in
the parallel system, and the UPS will shut down.
4) Switch off the main O/P breaker and O/P breaker in the parallel system.
5) Remove the wanted UPS and disconnect cables/wires.
6) Switch on the mains breaker and input breaker of the reserved UPS, make
sure the UPS work in bypass mode.
7) Switch on the O/P breaker and main O/P breaker.
8) Transfer the main maintenance switch or static switch from “BPS” to “UPS”,