PowerWalker VFI 10000TCP 3_1 - Manual (Page 44)

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The great virtue is the output frequency is fixed, which is required by
some very sensitive loads.
But the load should be derated to 60% when running in converter
mode with single phase input, and there is no derating with three
phases input.
6.3 Parallel Function
6.3.1 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. When the X is larger, the
reliability of the power system is higher. 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 4 UPSs can
be connected in parallel to realize output power sharing and power
redundancy.
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. And there is one standard parallel cable in the
accessories of every UPS.
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.