Liebert NXC - Page 16

16 User Manual 10H52188UM51 - Rev. 1 - 09/2011
Single UPS Installation and Commissioning Liebert NXC
Table 2-2 Max. steady state AC and DC current
UPS rated
power (kVA)
Rated current (A)
Mains input current
1
,
2
upon battery
charging with max. ability
Gross output current
2
at full load
Battery discharging current
upon min. battery voltage
380V 400V 415V 380V 400V 415V
10 (3-in 3-out) 22 22 22 15 15 14
34
10 (3-in 1-out) 22 22 22 45 44 42 34
15 (3-in 3-out) 31 31 31 23 22 21 50
15 (3-in 1-out) 31 31 31 69 65 63 50
20 (3-in 3-out) 36 36 36 30 29 28 67
20 (3-in 1-out) 36 36 36 90 87 84 67
Note:
When selecting the battery cables, according to the current value shown in table, the max. allowable voltage drop is 4Vdc. Do not ring
the cables, so as to avoid increasing the electromagnetic interference (EMI).
1: The mains current input of the rectifier and bypass.
2: Non-linear load (switch mode power) affects the neutral cable design of output and bypass. The neutral cable current may exceed
the rated phase current, in general, 1.732 times as large as the rated current (not applicable, when 3-in 1-out mode)
Table 2-3 Single UPS cable CSA (unit: mm
2
, ambient temperature: 25°C ）
Model
Input Output Bypass Neutral cable PE Battery
10kVA (3-in 3-out) 4 4 4 4 4 6
10kVA (3-in 1-out) 4 10 10 10 10 6
15kVA (3-in 3-out) 6 6 6 6 6 10
15kVA (3-in 1-out) 6 16 16 16 16 10
20kVA (3-in 3-out) 10 10 10 16 10 16
20KVA (3-in 1-out) 10 25 25 25 16 16
The recommended UPS I/O MCB capability 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 MCB selection
Model Input interface
Recommended capability of input
external MCB
Battery MCB
Output
interface
Main Bypass
10kVA (3-in 3-out) Terminal block 35A 35A DC 35A Terminal block
10kVA (3-in 1-out) Terminal block 35A 63A (1P) DC 35A Terminal block
15kVA (3-in 3-out) Teminal block 50A 50A DC 63A Terminal block
15kVA (3-in 1-out) Teminal block 50A 80A (1P) DC 63A Terminal block
20kVA (3-in 3-out) Teminal bock 63A 63A DC 80A Terminal block
20kVA (3-in 1-out) Teminal block 63A 125A (1P) DC 80A Terminal block
Note:
The 3-in 1-out MCB (125A) is used to connect the bypass input upon split-bypass configuration. The main MCB (63A) can be used
only upon common source configuration