Chapter 2 Single UPS Installation And Commissioning 15
Liebert
®
ITA 5kVA And 6kVA UPS User Manual
Battery
module
UPS
Figure 2-19 Installing the UPS with battery modules
2.5 Connecting Power Cables
I/O cables, battery cables and 10A charger cables (optional) are required for connection. When connecting the cables,
you should follow the local wiring regulations, take the environment situation into account, and refer to Table 3B of
IEC60950-1.
The maximum current in different operating modes is listed in Table 2-2, the recommended minimum cable CSA
(Cross-Sectional Area) is listed in Table 2-3. Select the appropriate cables according to Table 2-2 and Table 2-3.
Table 2-4 Max. steady state AC and DC current
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)
220V 230V
240V
220V
230V
240V
Battery discharging current upon
min. battery voltage
5 (1-in 1-out)
27
27
27
23
22
21
32
5 (3-in 1-out)
12
12
12
23
22
21
32
6 (1-in 1-out)
31
31
31
27
26
25
38
6 (3-in 1-out)
13
13
13
27
26
25
38
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 2-5 Single UPS cable CSA (unit: mm
2
, environmental temperature: 25°C
）
Model
Input
Output
Neutral cable
PE
Battery
5/6kVA
(1-in
1-out)
6 6 6 6 6
5/6kVA
(3-in
1-out)
6 6 6 6 6
The recommended I/O MCB capability of the UPS is listed in Table 2-4. Select the MCBs according to your
requirements.
Table 2-6 UPS I/O MCB selection
Model Input
interface
Recommended capability
of input external MCB
Battery
MCB
Output interface
Recommended capability
of output external MCB
5/6kVA (1-in 1-out)
Terminal block 63A DC63A
Terminal
block 40A
5/6kVA (3-in 1-out)
Terminal block 63A DC63A
Terminal
block 40A
Note
1. The UPS is high leakage current equipment, it is not recommended to configure the MCB with leakage current protection
function.
2. To ensure the reliable connection, the pipe type connection terminal (accessory of the UPS) is required for all cable
connections.
