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56 Chapter 7 “1+N” System
HIPULSE U UPS Single Module And “1+N” (Expandable) 160/200/300/400kVA User Manual
7.4.3 Power Cables
The wiring of power cables is similar to that of single module system. Refer to 3.1 Power Cabling.
The bypass and the main input sources must be referenced to the same neutral potential and input earth leakage
monitoring devices, if installed, must be located upstream of the common neutral sinking point.
7.4.4 Control Cables
Control cable connection of dual bus system consisting of two single units
If the dual bus system consists of two single units, use the optional 9-core LBS cable to connect between the LBS
interfaces (X4 socket on parallel board) of the two single units, and use another optional LBS cable to connect
between any two 25-core interfaces (X2-1 or X2-2) of the two single units, as shown in Figure 7-4.
Warning
Although the dedicated 25-core LBS cable looks like the parallel cable, it is absolutely not the parallel cable, and cannot be
replaced by it. Otherwise, UPS system chaos may occur.
Parallel board
X4
04116319 20m DB9-DB9
04115338 10m DB9-DB9
04115339 15m DB9-DB9
04116100 15m DB25-DB25
Parallel board
UPS unit 1 UPS unit 2
LBS cable
LBS cable
X4
X2-1 X2-2
X1-2X1-1
X2-1 X2-2
X1-2X1-1
Figure 7-4 Control cable connection of dual bus system consisting of two single units
Control cable connection of dual bus system consisting of a single unit and a parallel system
Figure 7-5 shows the control cable connection of the dual bus system consisting of a single unit and a parallel system
composed of two or more single units. Use the optional 9-core LBS cable to connect from the LBS interface (X4
socket on parallel board) of the single unit to the LBS interface of any single unit in the parallel system; and use
another optional LBS cable to connect from any 25-core interface (X2-1 or X2-2) of the single unit to the LBS
interface of any single unit except for the aforesaid one in the parallel system, note that this LBS cable has a 9-core
end and a 25-core end, respectively connecting the X4 interface of the parallel system and the 25-core interface of
the single unit.