14
Rack model:
6) Turn on the input breakers for the parallel UPS.
7) Pressing button continuously for more than 1 second for one UPS of the
system, then the system will turn to line mode.
8) Regulate the output voltage of the each UPS separately, and check if the
difference of output voltage is less than 0.5V among the parallel system. 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, turn off the input breakers to
let UPS shut down. And then switch on the output breakers for all the UPS.
10) Switch on the input breakers for the parallel UPS. Pressing
button
continuously more than 1 second for one UPS of the system, then the system
will turn to line mode, after these operations, the system will work normally in
parallel mode.
Note: The output wiring requirement as below:
1) If the distance between the UPS and breaker panel is less than 20 meters in
parallel system, the length difference between input and output cable of the
UPSs is required to be less than 20%.
2) If the distance between the UPS and breaker panel is more than 20 meters in
parallel system, the length difference between input and output cable of the
UPSs is required to be less than 5%.
2. 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.
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