34 Chapter 3 Parallel UPS Installation And Commissioning
Liebert
®
ITA 16kVA And 20kVA UPS User Manual
Table 3-3 Parallel parameters setting
Parameters
Default value
Parallel parameters setting
Single Group Batt Cap
0014
Set the parameter according to the actual battery capicitity
Battery Cells Number
32
Set the parameter according to the actual battery number
Equalize Charge Allowed
Enabled
Set the parameter according to the actual battery charicteristic
Shared Battery
Disabled
Select ‘Enabled’ if there is shared battery, select ‘Disabled’ if there is no shared
battery
System Configuration
Single
Parallel
Parallel requisite units
1
Set the paramerter to ‘3’ if there are four UPSs to form 3 + 1 parallel system
Parallel Redundant Units
0
Set the paramerter to ‘1’ if there are four UPSs to form 3 + 1 parallel system
ECO Mode
Normal
Normal
Output frencency level*
50Hz
Set the parameter according to the actual power grid, 50Hz/60Hz can be
selected
Output voltage level*
380V
Set the parameter according to the actual power grid, 380V/400V/415V can be
selected
3 Phase Output or 1 Phase
Output
Three
Select ‘Three’ when is 3 Phase Output, select ‘Single’ when is 1 Phase Output
Note*: Output frencency level and output voltage level will be active after power-off, but will not be displayed on LCD panel, the
settings will be valid after manual power-off.
The default values of other parameters are listed in Table 2-5.
For the parallel system with N + X (2
≤
N + X
≤
4), set ‘System Configuration’ to ‘Parallel’, ‘Parallel requisite units’ to
‘N’ (1
≤
N
≤
4), ‘Parallel Redundant Units’ to ‘X’ (0
≤
X
≤
3). Take the 3 + 1 parallel system for example, set ‘System
Configuration’ to ‘Parallel’, ‘Parallel requisite units’ to ‘3’, ‘Parallel Redundant Units’ to ‘1’, as shown in Figure 3-8.
ITA 016 kVA
Settings
Unit 1#
Enabled Disabled
System Configuration Parallel
Parallel requisite units 3
ESC
Disabled
Shared Battery
1 2 3 4
Single Parallel
14:30:36
ITA 016kVA
Settings
Unit 1#
0 1 2 3
ECO Mode Normal
Output frequency Level 50Hz
ESC
1
Parallel Redundant Units
Normal ECO
50Hz 60Hz
14:30:36
Figure 3-8 Settings interface
3.5.3 Power-On Commissioning For Parallel System
1. Set the parallel parameters of each UPS in the parallel system, then commission the inverter, the specific
commissioning procedures are as follows:
1) Make sure that the output MCBs of all UPSs in the parallel system are open, and then close the external input
MCB of each UPS in the parallel system, the UPS is powered on at the same time. If 1 + 1 parallel POD is configured,
close the corresponding input MCB and bypass MCB. At the same time, close the corresponding output MCB of the
other UPS which is being tested, and make sure that the corresponding output MCB of the other UPS is open.
Warning
After the UPS extenal output MCB or POD output MCB is closed, the UPS output terminal block, POD output terminal block and
load will be live, pay attention to personnel safety to avoid electric shock. Note whether it is safe to feed power to load.
2) The LCD displays the self check screen, and the fault indicator (red) and inverter indicator (green) are on at the
same time for about five seconds. After the self check, the UPS enter will enter the bypass state, the fault indicator
will turn on and the buzzer will beep for one second. If 1 + 1 parallel POD is configured, the UPS which is being
