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Vertiv I Liebert ITA2 30kVA I Manual
5. Since the UPS parallel system is not fitted with any auxiliary contact detection devices for
the output MCB or the maintenance bypass MCB of the UPS, removing the single UPS from
the parallel system before maintenance and adding the single UPS into the parallel system
after maintenance must be conducted strictly following the procedures provided in 5.2
Transfer Procedures Between Operation Modes. Failure to observe this may affect the
reliability of the load power supply.
3.3
Mechanical Installation
Taking the rack installation of the 1 + 1 parallel system, the mechanical installation method of
the parallel system is as follows:
1. The installation method of 1 + 1 parallel UPS is the same as that of the single UPS. Refer to
2.5 Mechanical Installation
for details.
2. As shown in Figure 3-1, the UPS should be installed at the bottom; and the 1 + 1 parallel
POD should be installed on the top to facilitate the cable connection and operation. The
installation method of 1 + 1 parallel POD is the same as that of the UPS.
Figure 3-1
1 + 1 parallel system installation
3.4
Connecting Power Cables
Each single UPS of the parallel system needs to configure the MCB and cables respectively,
refer to
2.6 Connecting Power Cables
for the specification. The recommended configurations
of the total power cables are listed in Table 3-1 to Table 3-4 for the parallel system.
Table 3-1
Input & output cable CSA for the 30kVA parallel system (unit: mm
2
, ambient temperature: 25
℃
)
Parallel
UPS
number
3-in 3-out
Single input cable for
parallel system
Single output cable
for parallel system
Total neutral line for
parallel system
Grounding cable for
parallel system
2 units
50
50
50
50
3 units
95
95
95
95
4 units
120
120
120
120
