14 Chapter 2 Single UPS Installation And Commissioning
Liebert
®
ITA 16kVA And 20kVA UPS User Manual
Rated current (A)
Mains input current
1, 2
upon battery
charging with max. ability
Gross output current
2
at full load
UPS rated
power (kVA)
380V 400V 415V 380V 400V 415V
Battery discharging current upon
min. battery voltage
20 (3-in 1-out)
36
36
36
90
87
84
67
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
Table 2-3 Single UPS cable CSA (unit: mm
2
, ambient temperature: 25°C
）
Model
Input
Output
Bypass
Neutral cable
PE
Battery
16kVA
(3-in
1-out)
10 25 25 35 16 16
16kVA
(3-in
3-out)
10 10 10 16 10 16
20kVA
(3-in
1-out)
10 25 25 35 16 16
20kVA
(3-in
3-out)
10 10 10 16 10 16
The recommended I/O MCB capability of the UPS is listed in Table 2-4, select the MCBs according to your
requirements.
Note
The UPS is high leakage current equipment, it is not recommended to configure the MCB with leakage current protection
function.
Table 2-4 UPS I/O MCB selection
Model
Input
interface
Recommended capability
of input external MCB
Battery MCB
Output
interface
Recommended capability of
output external MCB
16kVA
(3-in 1-out)
Terminal
block
3-in 1-out main 63A (3P),
bypass 125A (1P)
DC 80A (3P or 4P)
Terminal
block
Single phase 100A (1P)
16kVA
(3-in 3-out)
Terminal
block
3-in 3-out main 63A (3P),
bypass 125A (1P)
DC 80A (3P or 4P)
Terminal
block
Three phase 40A (3P)
20kVA
(3-in 1-out)
Terminal
block
3-in 1-out main 63A (3P),
bypass 125A (1P)
DC 80A (3P or 4P)
Terminal
block
Single phase 100A (1P)
20kVA
(3-in 3-out)
Terminal
block
3-in 3-out main 63A (3P),
bypass 125A (1P)
DC 80A (3P or 4P)
Terminal
block
Three phase 40A (3P)
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
Note
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.
