Parallel Operation; Parallel Installation - Phasak PH 9701 Manual De Uso

12. Installation
EN

12.4. Parallel operation.

12.4.1. 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.

12.4.2. 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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