Connecting I/O Cables - Emerson Liebert ITA User Manual

14 Chapter 2 Single UPS Installation And Commissioning
UPS rated
power (kVA)
20 (3-in 1-out)
Note:
When the battery cables are selected, according to the current value shown in this table, the max. allowable voltage drop is 4Vdc.
Do not ring the cables to avoid increasing the electromagnetic interference (EMI).
1: The input mains current of the rectifier and the bypass.
2: Non-linear load (switch mode power) affects the neutral cable design of the output and the bypass. The neutral cable current
may exceed the rated phase current, up to1.732 times as large as the rated current
Model
16kVA (3-in 1-out)
16kVA (3-in 3-out)
20kVA (3-in 1-out)
20kVA (3-in 3-out)
The recommended I/O MCB capability of the UPS is listed in Table 2-4, select the MCBs according to your
requirements.
The UPS is high leakage current equipment, it is not recommended to configure the MCB with leakage current protection
function.
Model
16kVA
(3-in 1-out)
16kVA
(3-in 3-out)
20kVA
(3-in 1-out)
20kVA
(3-in 3-out)
Note:
The 3-in 3-out bypass MCB (125A) is used to connect the bypass input upon split-bypass configuration. The mian MCB (63A) can
be used only upon common source configuration
The OT terminal is default standard configuration, which is used to connect the I/O cables of the copper shorting bar in 3-in 1-out
mode, it can not be used as the I/O cables of the UPS directly.

2.5.1 Connecting I/O Cables

The power cables of the UPS should be connected through the I/O terminal block located on the UPS rear panel.
Remove the protective cover A of the I/O terminal block shown in Figure 2-13 to reveal the I/O terminal block.
1, 2
Mains input current upon battery
charging with max. ability
380V 400V 415V
36 36
Table 2-3 Single UPS cable CSA (unit: mm
Input
10
10
10
10
Table 2-4 UPS I/O MCB selection
Input Recommended capability
interface of input external MCB
Terminal 3-in 1-out main 63A (3P),
block bypass 125A (1P)
Terminal 3-in 3-out main 63A (3P),
block bypass 125A (1P)
Terminal 3-in 1-out main 63A (3P),
block bypass 125A (1P)
Terminal 3-in 3-out main 63A (3P),
block bypass 125A (1P)
Liebert ITA 16kVA And 20kVA UPS User Manual
®
Rated current (A)
Gross output current
380V 400V
36 90 87
2
, ambient temperature: 25°C
Output Bypass
25 25
10 10
25 25
10 10
Note
Battery MCB
DC 80A (3P or 4P)
DC 80A (3P or 4P)
DC 80A (3P or 4P)
DC 80A (3P or 4P)
Note
2
at full load Battery discharging current upon
min. battery voltage
415V
84
）
Neutral cable PE
35 16
16 10
35 16
16 10
Output Recommended capability of
interface output external MCB
Terminal
Single phase 100A (1P)
block
Terminal
Three phase 40A (3P)
block
Terminal
Single phase 100A (1P)
block
Terminal
Three phase 40A (3P)
block
67
Battery
16
16
16
16