PowerWalker VFI 6000T LCD - Manual (Page 45)

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6.3.2 Parallel installation and operation
How to install a new parallel UPS system:
1) Before installing a new parallel UPS system, user need to
prepare the input and output wires, the output breaker, and the
parallel cable.
2) Users need to use 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 3m.
3) Remove the cover plate of the parallel port on the UPS,
connect each UPS one by one with the parallel cable, and
re-screw the Parallel port cover which is supplied in the
accessories.
4) Strictly follow the chapter of 4, the wiring requirement of single
UPS to perform the wiring of each UPS.
5) Connect the output wires of each UPS to an output breaker
panel.
6) 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.
7) Each UPS need an independent battery pack.
8) Please refer to the wiring diagram in the following diagram.
9) The distance between the UPSs in parallel and the breaker
panel is required to be less than 20 meters. The difference
between the wires of input and output of the UPSs is required to
be less than 20%.