30 Chapter 3 Parallel UPS Installation And Commissioning
Liebert
®
ITA 10kVA UPS User Manual
UPS2
UPS3
Input cable
Output cable
User input power
distribution unit
UPS1
UPS4
User output power
distribution unit
Figure 3-2 Block diagram of four-UPS parallel system
3.4.2 Connecting Parallel Signal Cables
The parallel system provides parallel signal cables (option). The parallel signal cables form a ring connection through
the parallel ports on the rear panel of the UPS. The cable connection schematic diagram of the 3 + 1 parallel system
is shown in Figure 3-3. The parallel port of the UPS is DB15 male port (pin shape), and the parallel cable port is DB15
female port (hole shape).
UPS1
UPS2
UPS3
UPS4
Figure 3-3 Cable connection schematic diagram of 3 + 1 parallel system
警告
危 险
Note
The parallel signal cables provided by Emerson must be used for the parallel system.
