Common Battery Strings; Double Bus System; System Installation - Liebert ITA UPS 16kVA User Manual

22 Chapter 2 Installation
Connecting I/O cables of the 1 + 1 parallel POD
1. A protective MCB must be series connected between the 1 + 1 parallel POD and the mains. It is recommended to use 80A MCB
in main input and 150A MCB in bypass input.
2. Confirm reliable connection for the earth cable.
1. Connect the input cables.
z For 3-in 3-out parallel system, connect the input cables (U, V, W, N, PE) respectively to the corresponding
terminals on the user terminal block (silk screen: USER) of the 1 + 1 POD rear panel.
z For 3-in 1-out parallel system, connect the input cables (L, N, PE) respectively to the corresponding terminals on
the user terminal block of the 1 + 1 POD rear panel.
2. Connect the output cables.
Connect one end of the output cable to the user terminal block of the 1 + 1 parallel POD, and connect the other end
of the output cable to the load.

2.9 Common Battery Strings

All the UPS singles in parallel system not only can share the battery strings, but also can use the battery strings
independently. The battery strings sharing in parallel system can save money for you.
The following section will introduce the connection and setting operation of common battery strings in parallel system.
Each UPS single should be equipped with the independent battery MCB. Refer to Table 2-2 and voltage of battery strings for
battery MCB type.
1. Connection: Power off the system completely and disconnect all the battery MCBs of the UPS single, and then
connect the terminal '+', 'N' and '-' of the shared battery strings respectively to the terminal 'Bat +', 'Bat N' and 'Bat -'
(see Figure 2-7) of the corresponding UPS single I/O terminal block in parallel system, through each battery MCB.
2. Setting: Power on the system, set each UPS single to battery strings sharing configuration through the LCD menu
'Function Settings' -> 'Common Battery Strings Settings' from each UPS single; set the LCD menu 'Function Settings'
-> 'Battery Cell Settings' and 'Battery Capacity Settings' from each UPS single, and each single setting must be the
same.
When the parallel system uses the battery strings sharing, the 'Battery Capacity' of the LCD settings of each UPS single stands for
the gross capacity of battery strings, and each single can calculate the battery capacity itself automatically.
3. Close the battery MCB for each single.

2.10 Double Bus System

2.10.1 System Installation

The double bus system is composed of two independent UPS system, and each UPS system can be composed of
one or two parallel UPS singles. The double bus system has high reliability, which is suitable for the load with many
input terminals. For single input load, you can add a selected static trigger switch (STS) to start the load bus
synchronization (LBS).
The double bus system uses LBS to realize the output sync of the two independent (or parallel) UPS systems. One is
the main system, and the other is the slave system. The operation mode of the double bus system contains main
Liebert ITA 16kVA/20kVA User Manual
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