Connecting I/O Cables - Liebert ITA UPS 16kVA User Manual

12 Chapter 2 Installation
1. PE line: Use the shortest wiring route when connecting the cabinet earth cable. The cross-sectional area (CSA) of
the earth cable should be selected according to the AC power fault level, cable length and protection type. According
to AS/IEC60950-1 the CSA is 10mm
2. When selecting the battery cables, according to the current value shown in Table 2-2, the Max allowable voltage
drop is 4Vdc. Do not ring the cables, which can avoid increasing the EMI.

2.6.2 Connecting I/O Cables

Distribution mode and terminal block
1. Distribution mode
There are two modes for UPS distribution: single power output distribution unit (POD) options provided by Emerson,
external distribution by the user.
According to the actual requirements, the I/O cable connections are divided into the following four types: 3-in 3-out,
common source configuration (factory default), 3-in 3-out, split-bypass configuration, 3-in 1-out, common source
configuration, 3-in 1-out, split-bypass configuration. In accordance with the four types of the two distribution methods,
this section will introduce the I/O cables connection procedures respectively.
This product is compatible with 3-in 3-out/3-in 1-out, default: 3-in 3-out. Change format according to the following steps, if you
need the 3-in 1-out system:
1. After the 3-in 1-out I/O connections are finished by following the instructions in this section, power on the system, then press the
emergency power-off (EPO) switch immediately.
2. Set the system to 'Single Phase Output' through the LCD menu 'Settings' -> '3-in 3-out/3-in 1-out'.
3. Power off the system completely, then power on again, the system will run in 3-in 1-out mode.
2. Terminal block
The power cables connection of the UPS should be connected through the I/O terminal block located on the UPS rear
panel. Figure 2-7 gives the terminals distribution of the I/O terminal block.
Note: 1. Main input: mA, mB, mC, mN; Bypass input: bA, bB, bC, bN
2
(20kVA, 3-in 3-out), 25mm
oN
Output: oA, oB, oC, oN; Battery: Bat +, Bat N, Bat -; GND: PE
2. In factory, four shorted copper bars 3 have been used to short terminals between mA and bA,
mB and bB, mC and bC, mN and bN respectively
Figure 2-7 Terminals distribution of the I/O terminal block
Liebert ITA 16kVA/20kVA User Manual
2
(20kVA, 3-in 1-out) as usual.
Note
Bat + Bat -
oA oB oC Bat N PE mN bN mA bA mB bB mC bC
3 3
3 3