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Chapter 4 Installation of Parallel Operation
System
The parallel operation system is installed as required by the installation procedures of the single
system and this chapter.
The single devices are put parallel and connected as shown in fig. 4-1, and the difference between
the lengths of the output cables of the single devices is not more than 10m. It is recommended to use an
external bypass cabinet to facilitate maintenance and system testing.
Fig. 4-1 Typical 1+N parallel operation system
Note: when the load exceeds the capacity of the single device, we recommended an external
manual Bypass.
The cables for the parallel operation provide double insulation shielding up to 30m long,
the control cables for the parallel operation must be connected with all single devices to form a closed
loop, as shown in fig.4-2.
Other power supplies
Rectifier
Charger
Inverter
Inverter
Output power supply
Load connected
Mains power input, UPS 1
L1, L2, L3, N terminal
Mains power input, UPS2
L1, L2, L3, N terminal
Rectifier
Charger
Q1
Q1
Q2
Q2
Q3-1
Q3-1
Q3-2
Q3-2
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NS3000 Series User Manual rev.01
Fig.4-2 Parallel cables
