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10. Installation
10.4 Parallel operation
1. Brief introduction of the redundancy
N+X is currently the most reliable power supply structure. N represents the minimum
UPS number that the total load needs; X represents the redundant UPS number, i.e.
the fault UPS number that the system can handle simultaneously. The bigger the X is,
the higher reliability of the power system is. For occasions where reliability is highly
depended on, N+X is the optimal mode.
As long as the UPS is equipped with parallel cables, up to 3 UPSs can be connected
in parallel to realize output power sharing and power redundancy.
2. Parallel installation
1) Users need to opt a standard 25-pin communication cable, which should have 25
cores, corresponding stitches and shield, as the UPS parallel cable. The length of
the parallel cable is appropriate to be less than 3 m.
2) Strictly follow the stand-alone wiring requirement to perform the input wiring of
each UPS.
3) Connect the output wires of each UPS to an output breaker panel.
4) Disconnect the Jumper on JP1 and JP2 of the terminal block first, and connect
each output breaker to a main output breaker and then to the loads.
＊ The requirement of the output wiring is as follows:
When the distance between the UPSs in parallel and the breaker panel is less
than 20 meters, the difference between the wires of input & output of the UPSs
is required to be less than 20%.
When the distance between the UPSs in parallel and the breaker panel is
greater than 20 meters, the difference between the wires of input & output of
the UPSs is required to be less than 10%.
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