POWER AVAILABILITY
Liebert NX™
USER MANUAL
10-20kVA
50/60Hz
400V
TABLE OF CONTENTS
1.0
SINGLE MODULE UPS INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
1.1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2
Preliminary Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3
Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3.1
1.3.2
1.3.3
1.4
Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.1
1.4.2
1.4.3
1.4.4
1.4.5
1.4.6
1.4.7
1.4.8
1.5
Rectifier and Bypass Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
External Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
UPS Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Cable Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Control Cables and Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.7.1
1.8
5
5
5
6
6
6
6
6
Power Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.6.1
1.7
System Cabinets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 to 20kVA UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Moving the Cabinets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Final Positioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Floor Anchoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Protective Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5.1
1.5.2
1.5.3
1.6
UPS Room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
External Battery Room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Monitor Board Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Dry Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.8.1
1.8.2
1.8.3
1.8.4
1.8.5
1.8.6
1.8.7
Input Dry Contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Bypass Cabinet Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Circuit-Breaker Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Dry Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Emergency Power Off Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Bypass Switch Interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Start Facility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
12
13
13
14
16
16
2.0
BATTERY INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.2
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.3
Battery Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6
2.3.7
2.3.8
2.3.9
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Isolator Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Temperature Board (Optional). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Moving the Battery Cabinets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Arrangement Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
i
19
19
19
19
19
20
20
20
21
2.4
Battery Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.4.1
2.4.2
2.4.3
2.4.4
Connection Principles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fitting the Batteries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Room Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
23
23
23
2.5
Battery Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.0
UPS MULTI-MODULE INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.1
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.2
Paralleled UPS Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.2.1
3.2.2
3.2.3
3.2.4
3.3
25
26
26
27
Hot-Standby UPS Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.3.1
3.3.2
3.3.3
3.4
Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Protective Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
External Protective Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Dual Bus System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.4.1
3.4.2
3.4.3
3.4.4
3.4.5
Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Protective Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Wires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Extended Dual Bus Synchronization Option (DBS Interface Box) . . . . . . . . . . . . . . . . . . . . .
28
29
29
30
30
4.0
INSTALLATION DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
5.0
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
5.1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.1.1
5.1.2
5.1.3
5.1.4
5.1.5
5.2
Features of NX Multi-Module UPS Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Requirements for Paralleling of UPS Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Modes of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
5.3.6
5.3.7
5.3.8
5.3.9
5.4
36
37
37
38
38
Multi Module UPS—1+N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.2.1
5.2.2
5.3
Split-Bypass Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Static Transfer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Temperature Compensation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Redundant Control Power Supply Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Socket Outlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Mode (Stored Energy Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auto-Restart Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bypass Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Mode (Manual Bypass) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ECO Mode (Single UPS Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parallel Redundancy Mode (System Expansion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hot-Standby Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Frequency Converter Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
39
39
39
40
40
40
40
40
40
Battery Management—Set During Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.4.1
Normal Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
ii
5.4.2
Advanced Functions (Software Settings Performed by the Commissioning Engineer) . . . . . 41
5.5
Battery Protection (settings by commissioning engineer) . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.0
OPERATING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.1.1
6.2
Power Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
UPS Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.2.1
6.2.2
Start-Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Verify Switching Between Operation Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.3
Switching the UPS from Normal to Maintenance Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.4
Powering Down the UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.5
Powering Down the UPS and Maintaining Power to Load . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.6
Emergency Shutdown With EPO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.7
Auto Restart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.8
Reset After Shutdown for Emergency Stop (EPO Action) or Other Conditions . . . . . . . . . . 47
6.9
Language Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.10
Changing the Current Date and Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.11
Command Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7.0
OPERATOR CONTROL PANEL AND DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
7.1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
7.1.1
7.1.2
7.1.3
7.1.4
7.1.5
Mimic Power Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audible Alarm (Buzzer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Direct Access Push Buttons (Keys) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LCD Monitor and Menu keys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Detailed Description of Menu Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50
50
51
51
53
7.2
All Status and Event Messages Displayed on the UPS Front Panel. . . . . . . . . . . . . . . . . . . 55
7.3
Prompt (Pop-Up) Windows. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
7.4
Dynamic Energy Flow Chart and UPS Help Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
7.5
Default Screen Saver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
8.0
OPTIONS—FOR ASSEMBLY INSIDE THE UPS CABINET . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
8.1
Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
8.1.1
8.1.2
8.1.3
8.1.4
8.1.5
8.2
Battery Ground Fault Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Redundant Fan for Power Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OC Web Card - SNMP/HTTP Network Interface Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Relay Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multiport-4 Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
61
62
63
64
64
OC485 Web Card – Modbus, Jbus, IGM Net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
8.2.1
Remote Alarm Monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
9.0
TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
9.1
Conformity and Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
iii
FIGURES
Figure i
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17
Figure 18
Figure 19
Figure 20
Figure 21
Figure 22
Figure 23
Figure 24
Figure 25
Figure 26
Figure 27
Figure 28
Figure 29
Figure 30
Figure 31
Figure 32
Figure 33
Figure 34
Figure 35
Figure 36
Figure 37
Figure 38
Model number nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Residual current circuit breakers (RCCB) symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Auxiliary terminal block detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Input dry contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Output dry contacts and EPO wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Battery start for UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Single temperature sensor and monitor board-U2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Battery cabinet bottom cable entry location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Battery cabinet with fuse or optional circuit breaker locations . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Battery room design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Emergency power off connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Typical 1+N system block diagram with common input supply, with separate batteries
and optional output / bypass distribution panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Dry contacts, multiple UPS modules with distribution panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Connection of 1+N system parallel control cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Hot standby configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Typical dual bus system configuration with static transfer switch and Load Bus Synch . . . . . . 29
Connections of a typical dual bus system utilising Load Bus Synch . . . . . . . . . . . . . . . . . . . . . . . 30
Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
General arrangement—10-20kVA UPS module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
10-20kVA NX front view with doors open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Location of parallel logic board M3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Internal battery layout and connecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Internal battery layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Single unit block diagram with split-bypass input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Multiple battery temperature sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
1+N multi-module UPS with external maintenance bypass switch . . . . . . . . . . . . . . . . . . . . . . . 38
Example of configuration for single UPS with external maintenance bypass cabinet. . . . . . . . . 46
UPS control and display panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Graphic LCD monitor windows and keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Menu tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Help screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Default screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Battery ground fault detection set connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Redundant power module fan set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Communication bays and cable location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
OC Web Card data summary window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
OC Web Card battery data summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
SiteNet MultiPort4 Intellislot pin configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
OC485 Web card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
iv
TABLES
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
Table 8
Table 9
Table 10
Table 11
Table 12
Table 13
Table 14
Table 15
Table 16
Table 17
Table 18
Table 19
Table 20
Table 21
Table 22
Table 23
Table 24
Table 25
Table 26
Table 27
Table 28
Table 29
Table 30
Table 31
Table 32
Table 33
Table 34
Table 35
Table 36
Distance from floor to connection point on the equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Maximum steady state AC and DC currents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Input dry contacts at X3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Maintenance bypass cabinet interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
External circuit-breaker interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Output dry contact relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
EPO input contact relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Input dry contact relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Dimensions and weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
UPS operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Rotary switch configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
UPS control and display panel components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Rectifier indicator—1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Battery indicator—2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Bypass indicator—3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Inverter indicator—4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Load indicator—5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Status (Alarm) indicator—6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Audible alarm key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Menu key Icons and their meaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
UPS system window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Descriptions of UPS menus and data window items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
UPS messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Prompt windows, meanings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Dry contact fault alarm signal is available for remote monitoring . . . . . . . . . . . . . . . . . . . . . . . . 61
Relay Card pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
SiteNet MultiPort4 Intellislot pin assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
NX communication options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Compliance with European, international standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Environmental characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Overall efficiency, heat losses and air exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Mechanical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Rectifier AC input (mains) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Inverter output to critical load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Bypass mains input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
v
Figure i
Model number nomenclature
NXe
0
A0
010
U
Input &
Output
Voltage
Feature Set for Region
A0 - EMEA
50/60Hz
Voltage
B0 - Aust/NZ
C0 - Japan
D0 - China
Output kVA
E0 - Latin Amer
010
F0 - Other
015
220/380
F
230/400
U
240/415
G
020
Revision to Base Unit
030 (future)
NX Product Line
UPS Single Module
Liebert NXe UPS module ratings:
10, 15, 20kVA (with internal battery)
Example: NXE0A0010U =
10kVA module for Europe and Middle East, 400V/230V
output
Options
Battery cabinet
Model
Identification
NXA0UFXBGF
Battery temperature probe (for external battery)
NXA0UFXBTS
Maintenance bypass cabinet (separate bypass input)
NXE0NMBX
Fan Redundancy kit
NXE0UFXRF
Seismic Anchor kit
NXA0UFXSAN
Dual bus control cable 05-10-15 metres
NXA0UFXD
Parallel control cable kit 05-10-15 metres
NXA0UFXP
Relay Card (On Bat, Bat Low, On Byp, Sum, UPS Fail)
MultiPort4 (4 sets On Bat, bat Low)
Web browser/TCPIP/SNMP Card
Jbus/Modbus Card
Note
NXE0NBCS
Battery Ground Fault detection kit
RELAYCARD-INT
MULTIPORT 4
OCWEB-LB
OC485CARD
RAM - Remote Alarm Monitor
NXA0CFXRAM
Modem card
NXA0CFXMOD
Extended LBS box
NXA0UFXLBS
vi
Code
Specify total system kVA
Specify UPS kVA rating
Specify length in metres
These are Intellislot plug-in cards
(3 slots available).
Requires RELAYCARD-INT
SAFETY PRECAUTIONS
This manual contains information concerning the installation and operation of this Emerson Network
Power Liebert NX Uninterruptible Power System (UPS).
This manual should be read before commencing installation.
The UPS must be commissioned and serviced by an engineer approved by the manufacturer (or
agent).
Failure to do so could result in personnel safety risk, equipment malfunction and invalidation of warranty.
The Liebert NX has been designed for Commercial/Industrial use only, and is not recommended for
use in life support applications.
This is a low emission CLASS A Uninterruptible Power System (UPS) product. In a residential environment, this product may nevertheless cause radio interference, in which case, the user may be
required to take additional measures.
Conformity and Standards
This equipment complies with CE directives 73/23 & 93/68 (LV Safety) and 89/336 (EMC), with Australia and New Zealand EMC Framework (C-Tick) and with the following product standards for Uninterruptible Power System (UPS).
• EN / IEC / AS 62040-1-1—General and safety requirements for use in operator access area
• EN / IEC / AS 62040-2—EMC requirements; Class A compliant
• EN / IEC / AS 62040-3—Performance requirements and test methods
For more details, see 9.0 - Technical Specifications
Continued compliance requires installation in accordance with these instructions and the use of manufacturer approved accessories only.
!
WARNING
High Leakage Current
EARTH CONNECTION IS ESSENTIAL BEFORE CONNECTING THE INPUT SUPPLY.
Earth leakage current exceeds 3.5 mA and is less than 860 mA.
Transient and steady-state earth leakage currents, which may occur when starting the
equipment, should be taken into account when selecting instantaneous RCCB or RCD devices.
Residual Current Circuit Breakers (RCCBs) must be selected sensitive to DC unidirectional
pulses (class A) and insensitive to transient current pulses.
Note also that the earth leakage currents of the load will be carried by this RCCB or RCD.
This equipment must be earthed in accordance with the local electrical code of practice.
!
WARNING
Back-Feed Protection Notice
This UPS is fitted with a voltage-free contact closure signal for use with an external
automatic disconnect device (supplied by others) to protect against back-feeding voltage into
the bypass input. If this signal is not used by the installer, a label must be added at the
external bypass input disconnect device to warn service personnel that the circuit is
connected to a UPS.
The text to use is the following or equivalent:
ISOLATE THE UNINTERRUPTIBLE POWER SYSTEM BEFORE WORKING ON THIS
CIRCUIT.
1
User-Serviceable Parts
All equipment maintenance and servicing procedures involving internal access requires the use of a
tool and should be carried out only by trained personnel. There are no user-serviceable parts behind
covers requiring a tool for removal.
This UPS is fully compliant with safety regulations for equipment located in an operator accessible
area. Hazardous voltage is present within the UPS and battery enclosure but out of reach of non-service personnel. Contact with hazardous voltage is minimized by housing live parts behind safety panels that require a tool for their removal. No risk exists to any personnel when operating the
equipment in the normal manner, following the recommended operating procedures.
Battery Voltage Exceeds 400VDC
All physical battery maintenance and servicing requires the use of a tool or a key and should be carried out only by trained personnel.
!
WARNING
Special care should be taken when working with the batteries associated with this equipment.
When connected together, the battery terminal voltage will exceed 400VDC and is potentially
lethal.
Battery manufacturers supply details of the necessary precautions to be observed when working on,
or in the vicinity of, a large bank of battery cells. These precautions should be followed implicitly at all
times.
Attention should be paid to the recommendations concerning local environmental conditions and the
provision of protective clothing, first aid and fire-fighting facilities.
2
Single Module UPS Installation
1.0
SINGLE MODULE UPS INSTALLATION
1.1
Introduction
This following section describes the requirements that must be taken into account when planning the
positioning and cabling of the Liebert NX uninterruptible power supply and related equipment.
This chapter is a guide as to general procedures and practices that should be observed by the installing engineer. The particular conditions of each site will determine the applicability of such procedures.
!
WARNING
Professional Installation Required
Do not apply electrical power to the UPS equipment before being authorised to do so by the
commissioning engineer.
The UPS equipment shall be installed by a qualified electrical tradesperson in accordance
with the information contained in this manual. All equipment not referred to this manual is
shipped with details of its own mechanical and electrical installation.
NOTE
Three-phase, 4-wire input supply required.
The standard Liebert NX UPS is suitable for connection to 3-phase, 4-wire (+ Earth) TN, TT
and IT AC power distribution systems (IEC60364-3). Optional 3-wire to 4-wire conversion
transformers are available. If it is used in IT AC power distribution systems, a 4-pole circuit
breaker must be used on the input and refer to the relative IT Systems’ standard
!
WARNING
Battery Hazards
Special care should be taken when working with the batteries associated with this equipment.
When connected together, the battery terminal voltage will exceed 400VDC and is hazardous.
Eye protection should be worn to prevent injury from accidental electrical arcs.
Remove rings, watches and all other metal objects.
Use only tools with insulated handles.
Wear rubber gloves.
If a battery leaks electrolyte or is otherwise physically damaged, it must be replaced, stored in
a container resistant to sulfuric acid and disposed of in accordance with local regulations.
If electrolyte comes into contact with the skin, the affected area should be washed
immediately with water.
1.2
Preliminary Checks
Before installing the UPS, please carry out the following preliminary checks:
1. Visually examine the UPS and battery equipment for transit damage, both internally and
externally. Report any damage to the shipper immediately.
2. Verify that the correct equipment is being installed. The equipment supplied has an identification
tag on the back of the main door reporting: the type, size and main calibration parameters of the
UPS.
3
Single Module UPS Installation
1.3
Location
1.3.1
UPS Room
The UPS and its internal battery is intended for indoor installation and should be located in an environment with clean air and with adequate ventilation to keep the ambient temperature within the
specified operating range (see Table 31).
All models in the Liebert NX UPS range are air-cooled with the aid of internal fans. Cold air enters
through ventilation grilles at the front of the cabinet and hot air is released through the grilles at the
back. Do not cover the ventilation openings.
If necessary to avoid room temperature build-up, install a system of room extractor fans. Optional air
filters are available if the UPS is to operate in a dusty environment.
The UPS heat dissipation detailed in Table 32 can be used as a guide for air conditioning sizing,
depending on the selected mode of operation:
• Normal Mode (VFI SS 111 Double Conversion UPS)
• ECO Mode (VFD SS 311 Stand By UPS)
If in doubt use Normal Mode figures.
NOTE
The UPS is suitable for mounting on concrete or other non-combustible surface only.
1.3.2
External Battery Room
Batteries should be mounted in an environment where the temperature is consistent and even over
the whole battery. Temperature is a major factor in determining the battery life and capacity. Typical
battery manufacturer performance data are quoted for an operating temperature between 20 and
25°C (68 and 77°F). Operating above this range will reduce the battery life while operation below this
range will reduce the battery capacity. In a normal installation the battery temperature is maintained between 15°C and 25°C (59 and 77°F). Keep batteries away from main heat sources or main air
inlets etc.
Where the batteries are located externally to the main UPS cabinet, a battery protection device
(e.g., fuses or circuit breakers) must be mounted as close as possible to the batteries themselves, and
connected using the most direct route possible.
1.3.3
Storage
Should the equipment not be installed immediately, it must be stored in a room for protection against
excessive humidity and or heat sources (see Table 31).
!
CAUTION
An unused battery must be recharged periodically per battery manufacturer
recommendation. Temporarily connecting the UPS to a suitable AC supply mains and
activating it for the time required for recharging the batteries can achieve this.
4
Single Module UPS Installation
1.4
Positioning
The cabinet is mounted on four castor-wheels for ease of positioning and for short distance movement.
Jacking feet are provided to prevent the UPS from moving once it has been wheeled to its final position.
For optimal design life, the place chosen must offer:
•
•
•
•
•
•
•
•
Easy connection
Enough space to easily work on the UPS
Sufficient air exchange of enough to dispel heat produced by UPS
Protection against atmospheric agents
Protection against excessive humidity and very high heat sources
Protection against dust
Compliance with the current fire prevention requirements
Operating environment temperature between 20°C and 25°C (68 and 77°F). The batteries are at
maximum efficiency in this temperature range (see Table 31).
The UPS cabinet is constructed around a steel chassis with removable panels. The top and side panels
are secured to the chassis by screws.
Access to the power terminals, auxiliary terminals blocks and power switches is from the front. Operational status and alarm information is provided through the front door operator control panel. Models 20kVA and below house both the power components and an internal battery. Cooling air enters
the front of the NX and is exhausted out the rear.
1.4.1
System Cabinets
A UPS may comprise a number of cabinets, depending on the design requirements (e.g., UPS cabinet,
external battery cabinet, external bypass cabinet). In general, all the Liebert cabinets used in a particular installation are of the same height and designed to be positioned side-by-side to form a matching
array.
Refer to 4.0 - Installation Drawings for assistance on positioning the cabinets described below.
1.4.2
10 to 20kVA UPS
The UPS consist of a single cabinet, which uses typically forty (40) 12V battery blocks, fitted internally and connected in series to provide a nominal battery voltage. The UPS may be shipped without
the batteries fitted.
An extended battery option is available. This comprises a separate cabinet containing additional batteries that can be connected to the UPS to increase its battery run time.
1.4.3
Moving the Cabinets
!
WARNING
Ensure that any equipment used to move the UPS cabinet has sufficient lifting capacity.
The UPS is fitted with casters. Take care to prevent the NX from moving when unbolting the
unit from its shipping pallet. Ensure that adequate personnel and lifting aids are available
when removing the shipping pallet.
Ensure that the UPS weight is within the designated surface weight loading of any handling equipment. See Table 33.
UPS and optional cabinets (battery cabinets, top cable entry cabinets, etc.) can be handled by means
of a forklift or similar equipment.
The UPS cabinet also can be moved short distances by its casters.
NOTE
Care must be taken when maneuvering units fitted with batteries. Keep such moves to a
minimum.
5
Single Module UPS Installation
1.4.4
Clearances
The Liebert NX has no ventilation grilles at either side of the UPS. To enable routine tightening of
power terminations within the UPS, in addition to meeting any local regulations, Liebert recommends providing adequate clearance in the front of the equipment for unimpeded passage of personnel with the doors fully opened. It is important to leave of 150mm (5.9") clearance behind the UPS to
permit adequate circulation of air coming out of the unit.
1.4.5
Access
The component layout of the UPS supports front and top access while servicing, diagnosing and
repairing the UPS, thus reducing the space requirement for side and rear access.
1.4.6
Final Positioning
The UPS cabinets are fitted with casters on the base to allow ease of movement and positioning.
!
WARNING
Casters are strong enough for movement across even surfaces only. Caster failure could occur
if they are subjected to shock loading.
When the equipment has been finally positioned, ensure the adjustable feet are set so that the UPS
will remain stationary and stable.
1.4.7
Floor Anchoring
Diagrams in 4.0 - Installation Drawings show the location of the holes in the base plate through
which the equipment may be bolted to the floor. If the equipment is to be installed on a raised floor it
should be mounted on a pedestal suitably designed to accept the equipment point loading. Refer to the
base view Figure 18 to design this pedestal.
1.4.8
Cable Entry
Cables can enter the Liebert NX UPS and battery cabinet from below. Cable entry is made possible by
removing a blanking piece fitted at the bottom of equipment to reveal the cable entry hole.
1.5
External Protective Devices
Circuit breakers or other protective devices must be installed in the AC supply, external to the UPS.
This chapter provides guidelines for qualified installers who must have knowledge of local wiring
practices pertaining to the equipment to be installed.
1.5.1
Rectifier and Bypass Input
Overcurrent protection must be installed at the distribution panel of the incoming main supply. The
protection must discriminate with the power cables current capacity and with the overload capacity of
the system (see Table 36). As a guideline, a thermomagnetic circuit breaker, with an IEC 60947-2
trip curve C (normal) for 125% of the current listed in Table 1 is suitable.
Split-Bypass—If a split-bypass is used, install separate protective devices for the rectifier and for
the bypass in the incoming mains distribution panel.
NOTE
Rectifier and bypass input sources must be referenced to the same neutral potential.
NOTE
For IT power systems, four-pole protective devices must be used, external to the UPS, both
upstream of the input distribution panel and downstream (toward the load).
6
Single Module UPS Installation
Earth Leakage (RCD):
Any residual current detector (RCD) installed upstream of the UPS input supply must be:
• sensitive to DC unidirectional pulses (Class A)
• insensitive to transient current pulses, and
• must have an average sensitivity, adjustable between 0.3 and 1A.
Figure 1
Residual current circuit breakers (RCCB) symbols
To avoid false alarms, earth leakage monitoring devices when used in systems with split-bypass input
or when used in paralleled UPS configurations, must be located upstream of the common neutral
sinking point. Alternatively, the device must monitor the combined four-wire rectifier and splitbypass input currents.
The residual earth current introduced by the RFI suppression filter inside the UPS is greater than
3.5mA and less than 300mA. Liebert recommends verifying the selectivity with all other differential
devices both upstream of the input distribution board and downstream (toward the load).
1.5.2
External Battery
The UPS and its associated batteries are protected against overcurrents through a DC compatible disconnect device.
1.5.3
UPS Output
Any external distribution board used for load distribution shall be fitted with protective devices that
discriminate with those used at the bypass input to the UPS and with the UPS overload characteristics (see Table 36).
1.6
Power Cables
The cable design must comply with the voltages and currents provided in this section, follow local wiring practices and take into consideration the environmental conditions (temperature and physical
support media).
For cable entry terminal, refer to Figure 19.
!
WARNING
Before starting the UPS, ensure that you are aware of the location and operation of the
external isolators that connect the ups input/bypass supply to the mains distribution panel.
Check that these supplies are electrically isolated and post any necessary warning signs to
prevent their inadvertent operation.
7
Single Module UPS Installation
Table 1
Maximum steady state AC and DC currents
Nominal Current, Amps
Input Mains Current
With Full Battery
Recharge
3ph + N
Busbar Stud Size
1,2
Output Current2
at Full Load
3ph + N
Input/Output/
Bypass
Cables
UPS
Rating
(kVA)
380V
400V
415V
380V
400V
415V
Battery at
End of
Discharge
10
22
21
20
15
14
13
22
15
33
32
31
22
21
20
33
20
44
43
42
30
29
28
44
Bolt
Hole
Dia.
(mm)
External
battery
Cables
(Bolts)
Torque
Load
(Nm)
M6
6
M6
5
1. Input mains current listed for common rectifier and bypass AC input. For split input the rectifier current is 94% of the currents
listed.
2. Non-linear loads (switch mode power supplies) affect the design of the output and bypass neutral cables. The current
circulating in the neutral cable may exceed the nominal phase current. A typical value is 1.5 In.
3. Protective earth cable: Connect each cabinet to the main ground system must follow the most direct route possible.
The earth conductor shall be sized in accordance with the AC supply fault rating, cable lengths and type of protection. Typical
cross sectional areas are 2.5mm2 (10kVA), 6mm2 (15kVA), 10mm2 (20kVA), as per AS / IEC 60950-1
4. When sizing battery cables, a maximum volt drop of 4 VDC is permissible at the current ratings given in Table 1. The load
equipment is generally connected to a distribution board containing individually protected busbars rather than connected
directly to the UPS output. The output cables from paralleled units to the parallel distribution bus should be of same length so
as to optimise the sharing of current. Do not form coils, so as to minimise the formation of electromagnetic interference.
5. For terminal location – refer to 4.0 - Installation Drawings)
!
Table 2
WARNING
Failure to follow adequate earthing procedures may result in electromagnetic interference or
in hazards involving electric shock and fire.
Distance from floor to connection point on the equipment
UPS
UPS 10-20 kVA
Minimum Distance
mm (in.)
Rectifier A.C. Input supply
284 (11-1/5)
Bypass A.C. Input supply
284 (11-1/5)
UPS Output A.C.
369 (14-1/2)
Battery Power
369 (14-1/2)
Auxiliary cables: Monitor board (U2)
1104 (43-1/2)
8
Single Module UPS Installation
1.6.1
Cable Termination
NOTE
The operations described in this section must be performed by authorised electricians or
qualified technical personnel. If you have any difficulties, do not hesitate to contact our
Customer Service and Support Department. See the back page of this manual for contact
information.
Once the equipment has been finally positioned and secured, connect the power cables as described in
the following procedure.
Refer to the appropriate cable connection drawing in 4.0 - Installation Drawings.
1.
Verify that the UPS equipment is isolated from its external power source and all the UPS power
isolators are open. Check that these supplies are electrically isolated and post any necessary
warning signs to prevent their inadvertent operation.
2. Open the door to the UPS cabinet and remove the front protective cover to gain access to the
connections bars.
3. Connect the safety earth and any necessary bonding earth cables to the copper earth busbar
located on the floor of the equipment below the power connections. All cabinets in the UPS must
be connected to the user’s ground connection.
NOTE
The earthing and neutral bonding arrangement must be in accordance with local and national
codes of practice.
Identify and make power connections for incoming cables according to one of the two procedures
below, depending on the type of installation.
Common Input Connections
4. For common bypass and rectifier inputs, connect the AC input supply cables between the mains
distribution panel and the UPS input (mA-mB-mC-N terminals) and tighten the connections to
5Nm (M6 Bolt). Ensure correct phase rotation.
Split-Bypass Connections
5. If a split-bypass configuration is used, connect the AC input supply cables to the rectifier input
busbars (mA-mB-mC-N terminals) and the AC bypass supply cables to the bypass input
(bA-bB-bC-N terminals) and tighten the connections to 5 Nm (M6 Bolt). Ensure correct phase
rotation.
NOTE
For split-bypass operation, ensure that the linking busbars between bypass and rectifier input
are removed.
The AC input and the AC bypass supplies must be referenced to the same neutral point.
Output System Connections
6.
Connect the system output cables between the UPS output (oA-oB-oC-N terminals) and the
critical load and tighten the connections to 5 Nm (M6 Bolt). Ensure correct phase rotation.
!
WARNING
If the load equipment will not be ready to accept power on the arrival of the commissioning
engineer, ensure that the system output cables are safely isolated at their ends.
9
Single Module UPS Installation
Internal UPS Battery Connection
7. The battery consists of a series string connection of 5 x 8 (or 10) x 12V 6-cell battery blocks.
a. Ensure that the 8 (or 10) battery blocks in each tier (tray) are interconnected.
b. Connect the positive, neutral and negative cables to the UPS terminals.
c. Plug in the cables between the tiers.
d. Ensure correct polarity battery string series connections (i.e., intertier and
interblock connections are from positive to negative terminals.
!
WARNING
Hazardous Battery Terminal Voltage 480VDC
Ensure correct polarity of string end connections to the UPS terminals, i.e., positive to
positive, negative to negative and neutral to neutral, but leave these UPS terminal cables
disconnected until connection is authorised by the commissioning engineer.
Ensure correct polarity of string end connections to the battery circuit breaker and from the
battery circuit breaker to the UPS terminals, i.e., positive to positive and negative to negative,
but disconnect one or more battery cell links in each tier.
Do not reconnect these links and do not close the battery circuit breaker before authorised by
the commissioning engineer.
8. Refit all protective covers removed for cable installation.
10
Single Module UPS Installation
1.7
Control Cables and Communication
1.7.1
Monitor Board Features
Based on your site’s specific needs, the UPS may require auxiliary connections to manage the battery
system (external battery circuit breaker, battery temperature sensor), communicate with a personal
computer or provide alarm signaling to external devices or for Remote Emergency Power Off (REPO).
The monitor board, arranged for this purpose, is located on the rear of the operator access door. The
main features are:
• Input and Output dry contacts signal (one pair of contacts of relay)
• Emergency Power Off control (EPO)
• Environmental parameter input interface
• User communication (for data setting and user background monitor)
• Intellislot™ interface
• Modem interface
• Temperature detect interface
Figure 2
Auxiliary terminal block detail
J8
J3
J1
LCD
J22
X7
J23
X6
J12
J9
J2
J15
PWR
Modem
SNMP Card
J16
J17
Intellislot 2
J13
J21
J25
J28
J4
J26
J30
J10
Intellislot 1
X4
J24
Intellislot 3
BFP
INV
X4
ACF
EPO
X2
Dry In
MBC
BCB
X3
11
The black square (
)
on each slot indicates Pin 1.
X4
X5
Single Module UPS Installation
1.8
Dry Contacts
The UPS provides input dry contacts and output dry contacts.
1.8.1
Input Dry Contacts
There are several input dry contacts at the X3 slot.
Figure 3
Input dry contacts
12V
12V
12V
12V
X3
Table 3
DRV
FB
GND
OL
FUSE
F_FAN
J10
T_OT
AUX_O
T_IT
AUX_I
J30
12V
GND
ENV
BtG
J26
GEN
12V
J4
Input dry contacts at X3
Position
Name
3
J4.1
ENV
J4.2
BtG
J4.3
GEN1,2
J4.4
+12V
Description
Battery Room Alarm (NC)
Battery Ground Fault Detection (NC)
On Generator (NO)
+12V Power
1 - Must be configured by configuration software before becoming active.
2 - When activated, the charger current can be limited, via software, to a percentage of the full charger current (0-100%).
3 - Activating this feature turns the battery charger off.
1.8.2
Maintenance Bypass Cabinet Interface
J26 and J30 are the MBC interface.
Table 4
Maintenance bypass cabinet interface
Position
Name
1
Description
Input transformer overtemperature (NC)
J26.1
T_IT
J26.2
AUX_I
Reserved
J26.3
+12V
+12V Power
J26.4
GND
Power Ground
J30.1
FUSE
Reserved
J30.2
F_FAN
Fan Fail Alarm (NC)
J30.3
T_OT
1
J30.4
AUX_O
1
Output Transformer Overtemperature (NC)
Reserved
- Must be configured by software before becoming active
NOTE
All auxiliary cables must be double insulated. Wire should be 0.5 - 1.5mm2
(16-20AWG) stranded.
12
Single Module UPS Installation
1.8.3
External Circuit-Breaker Interface
J10 is the interface to any external battery circuit breaker (BCB).
External circuit-breaker interface
Table 5
Position
Name
Description
J10.1
DRV
BCB Driver Signal - Output (N.O.)
J10.2
FB
BCB Contact State - Input (N.O.)
J10.3
GND
J10.4
OL
Power Ground
BCB On-Line - Input - This pin will become active when
BCB interface is connected. (N.O.)
NOTE
All auxiliary cables of terminal must be double insulated. Wire should be 0.5-1.5mm2
(16-20AWG) stranded for maximum runs between 25 and 50 meters (82-164ft.) respectively.
1.8.4
Output Dry Contacts
There are three output dry contact relays at the X1 slot (see Figure 4 and Table 6)
Table 6
X2
ACF_O
J28
ACF_S
J25
ACF_C
Gen_O
BPS_C
J21
Gen_S
Gen_C
J13
BPS_O
X1
Output dry contacts and EPO wiring
BPS_S
Figure 4
EPO - NO
EPO - NC
Output dry contact relays
Position
Name
Description
J13.2
Gen_O
Generator Start Relay (N.O.)
J13.3
Gen_S
Generator Start Relay Center
J13.4
Gen_C
Generator Start Relay (N.C.)
J21.2
BPS_O
Bypass Feedback Alarm Relay (N.O.)
J21.3
BPS_S
Bypass Feedback Alarm Relay Center
J21.4
BPS_C
Bypass Feedback Alarm Relay (N.C.)
J25.2
ACF_O
Main Input Fault Relay (N.O.)
J25.3
ACF_S
Main Input Fault Relay Center
J25.4
ACF_C
Main Input Fault Relay (N.C.)
NOTE
All auxiliary cables must be double insulated. Wire should be 16-20AWG stranded.
13
Single Module UPS Installation
1.8.5
Emergency Power Off Input
The UPS has an Emergency Power Off (EPO) function that operates by a button on the control panel
or by a remote contact provided by the user. The EPO button is under a hinged, clear plastic shield.
The X2 slot, shown in Figure 4, is the remote EPO input interface. The EPO has an NO/NC contact
point that becomes active when shorting terminals X2: 3 and 4 or open terminal connection X2: 2 and 1
If an external emergency stop facility is required, it is connected terminals X2: 1&2 or X2: 3&4 of the
auxiliary terminal block (X2). It also is connected to the normally open or normally closed remote stop
switch between these two terminals using shielded cable (see Figure 4 and Table 7). If this function
is not used, terminals X2: 3&4 must be opened and X2: 1&2 must be closed.
Table 7
EPO input contact relays
Position
Name
Description
J28.1
EPO_NC
EPO Activated when shorted to J28.2
J28.2
EPO_NC
EPO Activated when shorted to J28.1
J28.3
EPO_NO
EPO Activated when opened to J28.4
J28.4
EPO_NO
EPO Activated when opened to J28.3
NOTE
The emergency stop action within the UPS shuts down the rectifier, inverter and static bypass.
It does not internally disconnect the input power supply. To disconnect ALL power to the UPS,
open the upstream feeder breaker(s) when the remote EPO is activated.
NOTE
Normally closed EPO – X2: 1,2, these terminals are supplied factory-linked on the monitor
board.
X3 Ancillary Control and Alarms
X3 IN DRY: Environmental, Battery Ground Fault and Generator Contacts
The UPS accepts external signalling from voltage-free (dry) contacts connected to finger-proof, pushin terminal X3 IN DRY. Subject to prior software programming, the signalling is accepted by the UPS
when connection between the relevant terminal and the +12V terminal is altered. Cables connected to
X3 IN DRY must be segregated from power circuits (for screening purposes), double insulated and of a
typical 0.5 to 1mm2 cross-section area for maximum runs between 25 and 50 meters (82-164 ft),
respectively.
Table 8
X3
IN DRY
Input dry contact relays
Terminal
Name
Event Description
1
ENV (normal closed to +12V)
Environment detection
2
BtG (normal closed to +12V)
Battery ground fault detection (invokes alarm)
3
GEN (normal open to +12V)
On Generator detection
4
+12V
+12V power
X5: Auxiliary DC Power Output
Auxiliary DC power for modem or external SNMP card. The voltage is between 9V to 12V. The maximum current is 500mA.
X6: Analog Input Interface
Two analog signal channels with an input range is from 0 to +12V. The precision of detection is ÷3%.
•
•
•
•
X6 pin 1: Not used
X6 pin 2: +12V
X6 pin 3: ENV-T – environment temperature detection
X6 pin 4: GND
14
Single Module UPS Installation
X7: External Battery Temperature Detector Interface
Interface for TMP12Z temperature detector, normally connected to an external battery cabinet (see
Figure 6).
Pin reference:
•
•
•
•
X7 pin 1: Not used
X7 pin 2: +12V (Power supply for Temperature Monitoring Probe)
X7 pin 3: BAT-T (Battery Temperature signal)
X7 pin 4: GND
Serial Ports RS232-1 and RS232-2
RS232-1 provides serial data and is intended for direct use with Liebert MultiLink monitoring and
server shutdown software.
RS232-2 provides serial data and is intended for use by authorized commissioning and service personnel.
These serial ports are shared with the optional Web browser, SNMP, ModBus and relay cards. Refer
to Table 29 regarding compatibility of simultaneous use.
Intellislot Web Browser, SNMP, ModBus and Relay Cards Interface
There are three interface slots available for optional Web browser, SNMP, ModBus and Relay cards
as illustrated in 8.0 - Options—For Assembly Inside the UPS Cabinet.
15
Single Module UPS Installation
1.8.6
External Bypass Switch Interlock
EXT-Maint X3-1&2 on UPS Parallel Board M3 (leave open if no external bypass switch is used)
Provides external maintenance bypass interlock protection for the UPS. Short circuit means external
bypass closed.
EXT-Out (X3-3&4) on UPS Parallel Board (leave shorted if no external output switch is used). Provides external output interlock protection for paralleled UPS modules. Short circuit means external
output switch closed.
NOTE
UPS Parallel Board M3 is located behind protective covers accessible after opening the UPS
front door – removal of this barrier requires the use of a tool and is restricted to service
personnel.
1.8.7
Battery Start Facility
1. Rotate the switch to Normal Mode.
2. Verify that the batteries are connected.
3. Press Battery Start Button.
The LCD begins to show startup screens. The rectifier indicator flashes green while the rectifier is
starting up. It stops flashing and becomes solid green about 30 seconds after the rectifier enters
the normal operation state.
4. After UPS has initialized, press Inverter On
Figure 5
Battery start for UPS
Battery Start Button
16
Battery Installation
2.0
BATTERY INSTALLATION
2.1
Introduction
The UPS battery bank consists of battery blocks connected in series to provide a D.C. string voltage as
required by the UPS converter. The 'AUTONOMY TIME' (the time during which the battery can
maintain supply to the load in the event of a mains failure) is limited by the ampere-hour capacity of
the battery blocks and in some cases this results in several strings being connected in parallel.
The NX usually has internal batteries, but longer run time is available by using an external battery
cabinet.
The battery cabinet will be supplied in one of the following forms:
1.
2.
Complete installation, comprising the battery cabinet, batteries and protective device.
Battery cabinets and protective device only—batteries supplied by others
NOTE
10kVA to 20kVA UPS models contain an internal battery compartment that can accommodate
up to 44 blocks 12 Ah/12V batteries.
The battery bank may be disconnected from the UPS for maintenance or service. The isolator may be
switched manually ON or OFF.
17
Battery Installation
2.2
Safety
Special care should be taken when working with the batteries associated with the Liebert NX UPS
system. When all the cells are connected together, the battery terminal voltage is potentially hazardous. The battery installation must be segregated from all but appropriately qualified maintenance
personnel by locating the cells in a key-lockable cabinet or in a purpose-designed, dedicated battery
room. When the batteries require maintenance, these precautions must be taken:
• The rotary switch must be turned to Maint. position.
• The input circuit breaker (CB1) must be opened.
• The ANDERSON connector must be disconnected..
NOTE
The fuse on the battery EMI board (UHK241A2 PCB) is 600VDC/30A, High Speed Fuse
NOTE
Full safety instructions concerning the use and maintenance of UPS batteries are provided in
the appropriate battery manufacturers manuals. The battery safety information contained in
this section relates to key considerations that must be taken into account during the
installation design process and might affect the design outcome depending on localised
conditions.
!
WARNING
Hazardous battery voltage present behind covers
No user-serviceable parts are located behind covers that require a tool for their removal. Only
qualified service personnel are authorised to remove such covers.
When using internal batteries in 10 to 20kVA units, the batteries are always connected
through power fuses to the UPS and to the segregated terminal bars available for connection
to an external battery.
Isolate any internal battery connections before attempting to access the segregated terminal
bars available for connection to an external battery.
The following general battery safety precautions and warnings should be observed at all
times:
• A battery can present risk of electric shock or burn from high- short-circuit currents.
• The full nominal string voltage, when the battery blocks are interconnected, is 480VDC,
which is hazardous
• Only qualified personnel should install or service batteries.
• Eye protection should be worn to prevent injury from electrical arcs.
• Remove rings, watches, necklaces, bracelets and all other metal objects.
• Use only tools with insulated handles.
• Wear rubber gloves and a rubber apron when handling batteries.
• If a battery leaks electrolyte or is otherwise damaged, it should be placed in a container
resistant to sulfuric acid and disposed of in accordance with local regulations.
• If electrolyte comes into contact with the skin the affected area should be washed immediately with plenty of clean water.
• Batteries must always be disposed of according to local environmental laws.
• When replacing batteries, use the same number and type that were originally fitted.
• Disconnect charging source before connecting or disconnecting battery terminals.
• Determine whether the battery is inadvertently grounded. If it is inadvertently grounded,
remove the source of the ground. Contact with any part of a grounded battery can result in
electrical shock.
18
Battery Installation
2.3
Battery Cabinet
2.3.1
Introduction
This cabinet can also be used in conjunction additional cabinets, to provide the necessary accommodation required by the larger cells associated with system’s having a long autonomy time.
Where two (or more) cabinets are used they are positioned alongside each other and secured and
bonded together. If the cabinet(s) is located immediately adjacent to the main UPS equipment the two
units are bolted together.
2.3.2
Temperature Considerations
Valve-regulated, lead acid battery cells are sensitive to ambient temperature and should be operated
between 15°C and 25°C (59-77°F). Battery capacity is increased by 1% for every 1°C (2°F) increase in
temperature up to 25°C (77°F). Battery life is reduced at temperatures above 25°C (77°F).
When batteries are mounted in the same room as the UPS unit, it is the battery that dictates the
designed maximum ambient temperature, not the UPS. — i.e. in the case of valve-regulated cells, the
ambient room temperature should be kept between 15°C and 25°C (59-77°F), and not between 0°C
and 40°C (32-104°F) (which is the specified main equipment operating temperature range). Temperature deviations are permissible for short periods, provided the average temperature does not exceed
25°C (77°F).
2.3.3
Dimensions
The external dimensions are shown in Table 9. These are the same height and depth as the UPS
module and provide a matching appearance when bolted together. All cabinets are fitted with doors,
which must be fully opened in order to fit or remove the batteries. The door swing must therefore be
taken into consideration when planning the positioning of the cabinets.
2.3.4
Weight
The unladen weight is shown below in Table 9. When designing the battery installation the weight of
the batteries and cables must be added to the unladen weight. This is particularly important when
placing the NX on a raised floor.
Table 9
2.3.5
Dimensions and weight
Model
Optional
Circuit Breaker
Amperes
Maximum
Discharge Current
(at EOD)
Battery Cabinet
50A
10kVA 22A
15kVA 33A
20kVA 44A
External Cabinet
WxDxH mm (in)
820x700x1400
(32-1/4x27-5/8x55)
Cabinet Weight
Without Batteries
kg (lb)
170 (375)
Circuit Isolator Features
The UPS is fitted with internal Anderson connectors and fuses for connection and disconnection of
batteries. External battery banks are protected by battery fuses or a optional circuit breaker (with
status contacts and undervoltage trip coil). Refer to 2.5 - Battery Control for details.
19
Battery Installation
2.3.6
Battery Temperature Board (Optional)
The optional external battery temperature sensor kit contains one probe and one temperature transport board as illustrated in Figure 6. It is connected to the UPS Monitor Board.
Figure 6
Single temperature sensor and monitor board-U2
Name: W2 L=5m
Temperature
Sensor
Name: W1 L=30m
X7
NC
12V
OUT
GND
+
IN
TMP-2
Monitor
Board
– U2
-12V
BAT-T
GND
UPS
Cable W2 is packed with the temperature sensor.
2.3.7
Moving the Battery Cabinets
!
WARNING
Ensure any lifting equipment used in moving the cabinet has sufficient lifting capacity.
Ensure that the weight is within the designated surface weight loading of any handling equipment.
See Table 9 for weight details.
Battery cabinets can be handled by means of a fork lift or similar equipment.
NOTE
Care must be taken when maneuvering units fitted with batteries. Keep such moves to a
minimum.
When the equipment has been finally positioned ensure the adjustable feet are set so that the
battery cabinet will remain stationary and stable.
Seismic anchors option is available for anchoring the unit to a concrete floor.
2.3.8
Cable Entry
Cables enter the battery cabinet from the bottom. Cable entry is made possible by removing a blanking piece fitted at the bottom to reveal the cable entry hole.
20
Battery Installation
2.3.9
General Arrangement Drawings
Refer to Figures 7 and 8 for general arrangement of battery cabinet models.
Figure 7
Battery cabinet bottom cable entry location
Bottom View
700
250
82,5
100 83
1400
620
828
All dimensions are
expressed in millimeters.
21
Battery Installation
Figure 8
Battery cabinet with fuse or optional circuit breaker locations
Bottom cable entry
2.4
Battery Power Cables
2.4.1
Connection Principles
The following notes, in conjunction with the diagrams, illustrate the broad principles to be followed
when fitting and connecting the majority of battery installations.
22
Battery Installation
2.4.2
Fitting the Batteries
1. In general, at least 10mm (3/8") must be left unobstructed on all vertical sides of the battery
blocks to permit free air movement around the cells.
2. Clearance should be allowed between the top of the cells and the underside of the shelf above (this
is necessary for monitoring and servicing the cells).
3. When installing the batteries on racks always work from the bottom shelf upwards to prevent
raising the centre of gravity.
2.4.3
Connecting the Battery
1. When the battery cabinet is installed on a raised floor the battery power cables and optional circuit
breaker control cables can be routed to the UPS cabinet via the floor of the cabinet. If the UPS and
battery cabinet are located adjacent to each other and located on a solid floor these cables can be
passed between the cabinets via the lifting apertures located in the lower sides of the cabinets.
2. In general it is recommended that the inter-connecting cables be fitted to the batteries within
their particular level before fitting the inter-level connecting cables, followed finally by the cables
to the circuit breaker.
3. An insulating shroud should be fitted to each terminal after its connection has been made.
4. When connecting the cables between the battery string ends to the optional circuit breaker always
connect the circuit breaker end of the cable first.
2.4.4
Battery Room Design
Whatever the type of mounting system selected, the following conditions should be noted:
• Cell Layout—1
Whichever battery mounting system is used, the batteries should be arranged to prevent the possibility of simultaneous contact with two exposed live parts having a potential greater an 150V.
Where this is not possible, insulated terminal shields must be installed and insulated cables must
be used for connections.
• Service Platform—2
The service platform (or duckboard) must be slip-proof, insulated from the floor and at least one
metre (39 in.) wide.
• Connections—3
All connections must be as short as possible.
• Battery Protection Fuses/Circuit Breaker—4
The battery circuit breaker is generally installed at the front of the battery room. See 2.5 - Battery Control for details on connecting the circuit breaker box available for the Liebert NX.
Figure 9
Battery room design
4
1
3
2
2.5
Battery Control
Battery temperature sensor cables are connected between UPS auxiliary terminal block X3 BCB, the
Battery Temperature sensor and the battery as shown in Figure 6.
Cables connected to X3 BCB must contain a protective earth wire or a shield, be segregated from
power circuits, double insulated and of a typical 0.5 to 1mm2 cross section area for maximum runs
between 25 and 50 meters respectively. The shield should be connected to the protective earth of the
battery cabinet or battery breaker, not at the UPS
23
UPS Multi-Module Installation
3.0
UPS MULTI-MODULE INSTALLATION
3.1
General
The installation of a multi-module UPS configuration must follow the installation procedure for a single UPS module with the additional requirements detailed in this chapter.
In addition to the local EPO push button on the front panel of the UPS module (that stops operation of
that module), the UPS supports also a remote emergency stop to permit simultaneous multi-module
shutdown.
NOTES
1. The remote emergency power off switch must be voltage-free and Normally Open or
Normally Closed.
2. The open voltage supplied is 12VDC, < 20mA
3. This external emergency stop may be supplied with a second set of contacts that can be used
to trip incoming mains or bypass supply circuit breakers supplied by others and fitted with
remote trip units.
4. Normally Closed EPO - X2: 1&2, these terminals are supplied factory-linked on the monitor
board.
Figure 10 Emergency power off connections
UPS2
X2:3
X2:4
X2:3
X2:4
Monitor Board
Monitor Board
UPS1
EPO
UPS2
X2:3
X2:4
X2:3
X2:4
Monitor Board
UPS1
EPO
24
Monitor Board
UPS Multi-Module Installation
3.2
Paralleled UPS Modules
The basic installation procedure of a parallel system comprising two or more UPS modules is the
same as that of single module system. The following sections only introduce the installation procedures specific to the parallel system.
3.2.1
Cabinet Installation
Place the UPS modules side by side and interconnect as shown in Figure 11. The distribution panel
(external bypass cabinet) is optional but recommended for ease of maintenance and system testing.
Figure 11 Typical 1+N system block diagram with common input supply, with separate batteries and
optional output / bypass distribution panel
SUPPLIED BY OTHERS
INPUT MAINS
INPUT MAINS
SUPPLY L1, L2, L3, N
UPS1
SUPPLY L1, L2, L3, N
CB1
UPS2
RECTIFER
CB1
RECTIFER
SW1-C
FUSES
SW1-C
FUSES
STATIC
SWITCH
STATIC
SWITCH
CHARGER
CHARGER
BATTERY 2
BATTERY 1
INVERTER
INVERTER
SW1-D
SW1-A
SW1-A
L1, L2, L3, N
L1, L2, L3, N
Q2EXT
Q1EXT
QUPS
Distribution Cabinet
TO LOAD
25
QBYP
UPS Multi-Module Installation
Figure 12 Dry contacts, multiple UPS modules with distribution panel
Input Distribution
UPS 1
UPS 2
UPS N
M3 Board
X3
M3 Board
X3
M3 Board
X3
Ext. Maint. Ext. Out
Ext. Maint. Ext. Out
Q1Ext
Ext. Maint. Ext. Out
Q2Ext
Distribution Panel
QUPS
QnExt
QByp
To Load
3.2.2
External Protective Devices
Refer to the instructions in 1.0 - Single Module UPS Installation.
3.2.3
Power Cables
The wiring of power cables is similar to that of single module system. The Bypass and the Main input
sources must be referenced to the same neutral potential and input earth leakage monitoring devices,
if installed, must be located upstream of the common neutral sinking point. Refer to the instructions
in 1.0 - Single Module UPS Installation.
NOTE
The length and specification of power cables including the bypass input cables and UPS output
cables should be the same. This facilitates load sharing when operating in bypass mode.
26
UPS Multi-Module Installation
3.2.4
Control Cables
Intermodule Control
Shielded and double insulated control cables available in lengths of 5, 10 and 15 meters must be must
be interconnected in a ring configuration between UPS modules as shown below. The parallel control
board is mounted on the top, behind protective cover of each UPS module (refer to Figure 20). The
ring configuration ensures high reliability of the control. Refer to Figure 13.
Figure 13 Connection of 1+N system parallel control cables
3.3
Hot-Standby UPS Modules
3.3.1
Cabinet Installation
X1-1
X1-2
X1-1
X2-1
P1
X2-2
P2
P1
P2
X1-2
X2-1
X1-2
P4
X1-1
X2-2
X4
P3
X1-2
X2-1
P1
P2
P2
X1-1
X2-2
Parallel Board
X3
P5
X4
P4
X1-2
X4
X2-1
6
Parallel Board
X3
P5
P3
X1-1
X2-2
5
Parallel Board
X3
P5
P3
X1-2
X2-1
4
X4
P3
P2
P1
X2-2
P3
P3
X1-1
X2-1
P4
P2
X2-2
X4
P1
X4
Parallel Board
X3
P5
P1
Parallel Board
X3
P5
P4
Parallel Board
X3
P5
UPS
3
P4
2
P4
1
Place the UPS modules side by side and interconnect as shown below.
The hot standby mode comprises two series connected UPS modules of the same rating. One module
is designated as the hot standby master, and the other module is designated as the hot standby slave.
Their roles are determined by power connection and configuration software. In normal operation, both
slave and master operate in normal mode and the output from one upstream UPS feeds the bypass
input to the other (downstream) UPS. The output of the downstream UPS is connected to the critical
load and is always synchronised to the output of the upstream UPS. If the inverter of the UPS connected to the load fails, the inverter of the upstream UPS supplies the load through the downstream
UPS bypass circuit. The system can be programmed to cycle the downstream UPS between Normal
mode and bypass mode so that both ups are equally exercised.
NOTE
If it is a hot-standby system, the master must be turned on first.
3.3.2
External Protective Devices
Refer to the instructions in 1.0 - Single Module UPS Installation.
27
UPS Multi-Module Installation
3.3.3
Power Cables
The wiring of power cables is similar to that of single module system except that the output of the
upstream UPS is fed into the bypass input of the downstream UPS, and the load is fed by the downstream UPS through its inverter or bypass. The bypass and the main input sources must be referenced to the same neutral potential and input earth leakage monitoring devices, if installed, must be
located upstream of the common neutral sinking point. Refer to the instructions in 1.0 - Single Module UPS Installation.
No control wires other than those specified for the single module configuration are required.
Figure 14 Hot standby configuration
INPUT DISTRIBUTION
UPSTREAM
DOWNSTREAM
Bypass L1,
L2, L3, N
Mains L1,
L2, L3, N
Q1
Q1
B1
RECTIFIER
STATIC
SWITCH
Bypass L1,
L2, L3, N
Mains L1,
L2, L3, N
Q2
INVERTER
L1, L2, L3, N
L1, L2, L3, N
UPS1
OUTPUT
TO LOAD
3.4
Dual Bus System
3.4.1
Cabinet Installation
The Dual Bus System consists of two independent UPS configurations each consisting of one or more
UPS modules. Dual Bus Systems are high availability configurations suitable for loads with multiple
input terminals. For single input loads an optional Static Transfer Switch may be added and the standard Load Bus Synchroniser activated. Depending on the configuration, follow the appropriate installation instructions for each system.
Place the UPS modules side by side and interconnect as shown below.
The objective of the Dual-bus Synchronizer (DBS) is to keep the output of two independent UPS systems (or parallel systems) in synchronization. One system is designated as the master; the other is
designated as the slave. The operating modes covered comprise master and or slave operating
inverter or bypass mode.
28
UPS Multi-Module Installation
Figure 15 Typical dual bus system configuration with static transfer switch and Load Bus Synch
Bypass
supply
Bypass
supply
Input
Rectifier
UPS 6
Input
Rectifier
UPS1
Intermodule
control cable
Input
Rectifier
LBS
Input
Rectifier
UPS 6
UPS1
Intermodule
control cable
STS
Load
3.4.2
External Protective Devices
Refer to the instructions supplied in 1.0 - Single Module UPS Installation.
3.4.3
Power Cables
The wiring of power cables is similar to that of single module system. The Bypass and the Main input
sources must be referenced to the same neutral potential and input earth leakage monitoring devices,
if installed, must be located upstream of the common neutral sinking point. Refer to the instructions
in 1.0 - Single Module UPS Installation
29
UPS Multi-Module Installation
3.4.4
Control Wires
For Liebert NX to NX dual bus configuration, interconnect the optional DBS cable between any DBS
ports of two parallel systems as illustrated in Figure 16.
Figure 16 Connections of a typical dual bus system utilising Load Bus Synch
UPS
8
X1-2
X2-1
P1
X2-2
X1-1
X1-2
P4
X1-1
X1-2
X2-1
P2
P2
P1
X2-2
X4
P3
DBS Cable
P4
X1-1
P3
P4
X1-2
X2-1
Parallel Board
X3
P5
X4
P1
X2-2
P2
X2-1
P1
P2
P3
X1-1
X4
P4
X4
X2-2
Parallel Board
X3
P5
Parallel Board
X3
P5
P3
Parallel Board
X3
P5
UPS
8
Parallel System I
A
Parallel System II
B
NOTE
Example shown with ring control cables ("8") for DSB applied to two 1+1 paralleled systems.
3.4.5
Extended Dual Bus Synchronization Option (DBS Interface Box)
For Liebert NX to non- NX (whether another Liebert UPS range or not) dual bus configuration, one
DBS interface box shall be mounted on the non- Liebert NX UPS. In this situation, the other UPS system is always treated as a master and the following conditions are covered:
• Master and slave are both on inverter
• Master on bypass, slave on inverter
30
Installation Drawings
4.0
INSTALLATION DRAWINGS
Figure 17 Electrical connections
Earth
UPS
To Customer’s Safety
Earth
A
X3
Ext. Maint.
B
Parallel Board
C
Ext. Out
To Critical Load
N
Power
Cables
A
B
X5
X4
ModemSNMP
Main/Bypass Input
Supply
N
RS-485
J4
Gen
J13
BPS
J21
AFC
J25
X2 Ext EPO
Input
X3
J26
MBC
J28-1
J28-2
J28-3
J28-4
BCB
J30
X3
External Battery
X7
J10-1
J10-2
J10-4
J10-3
J22-2
J22-3
J22-4
X1
C
Monitor Board
+ N Batt
31
Installation Drawings
Figure 18 General arrangement—10-20kVA UPS module
600
700
10mm dia threaded
mounting holes
2
7
86.5
1400
1
Leveler
Detail A, rear of unit
shown without side panel
Leveling feet
90
LEFT SIDE VIEW
FRONT VIEW
5
420
10-20 kVA
3
180
4
867.5
700
Air
Intake
28
1380
6
103
321
320
625
430
520
TOP VIEW
BOTTOM VIEW
1) Air inlet grille
2) Air outlet grille
3) Adjustable fixing feet
4) Castors for maneuvering
5) Seismic anchors (option)
6) Cable entry
7) Operator control and display panel
All dimensions are in mm.
32
Installation Drawings
Figure 19 10-20kVA NX front view with doors open
1) Main/Bypass Input terminal (T1)
2) Battery /Output terminal (T2)
3) Internal battery Input switch (CB2)
4) Rotary switch (SW1)
5) Monitor board (U2)
5
4
3
2
1
T2
External Battery Input
Output
T1
Main Input
Bypass Input
33
Installation Drawings
Figure 20 Location of parallel logic board M3
Battery
Start
Interface
Parallel
Logic
Board
NXe 10-20kVA Top View
Figure 21 Internal battery layout and connecting
BOTTOM LAYER
Layer 5
Layer 4
W501 2 pcs
TOP LAYER
Layer 1
Layer 2
+
-
+
-
-
+
-
+
+
-
+
-
+
-
+
Layer 3
W500
34pcs
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
+
-
+
-
+
-
+
-
+
-
-
+
-
+
-
+
-
+
-
+
+
-
+
-
+
-
+
-
+
-
-
+
-
+
-
+
-
+
-
+
-
W506 CB2_5
W500
34pcs
W503 4 pcs
+
W502 4 pcs
N
W508 CB2_1
W504 CB2_3
34
Installation Drawings
Figure 22 Internal battery layout
347mm
151mm
562mm
160mm
160mm
160mm
160mm
Battery
136mm
35
Operation
5.0
OPERATION
!
WARNING
Hazardous Mains and / or Battery Voltage present behind covers.
No user-serviceable parts are located behind covers that require a tool for their removal. Only
qualified service personnel are authorised to remove such covers.
5.1
Introduction
Liebert’s NX™ Uninterruptible Power System system provides continuous, high-quality AC power to
your business-critical equipment, such as telecommunications and data processing equipment. The
NX UPS supplies power that is free of the disturbances and variations in voltage and frequency common to utility power, which is subject to brownouts, blackouts, surges and sags.
The NX utilizes the latest in high frequency, double-conversion pulse width modulation (PWM) technology and fully digital controls to enhance its reliability and increase the ease of use.
The standard NX consists of the UPS and internal batteries in a compact, single cabinet.
As shown in Figure 23, the AC utility source is input at CB1 and the rectifier converts the AC utility
into DC power. The inverter converts that DC power from the utility—or DC power from the batteries
—into AC power for the load. The batteries power the load through the inverter in the event of a
power failure. The utility source can also power the load through the static bypass.
If maintenance or repair of the UPS is necessary, the load can be switched without interruption in
service to the maintenance bypass.
Figure 23 Single unit block diagram with split-bypass input
SW1/D
Maintenance Bypass
Static Switch
SW1/C
Bypass Input
Rectifier
Inverter
AC Utility Input
Static Switch
SW1/A
UPS
Output
CB1
SW1/B
Neutral Wire
Battery
Charger
Battery
5.1.1
Split-Bypass Input
Figure 23 illustrates the Liebert NX UPS in what is known as the split-bypass configuration wherein
a separate power switch to a dedicated bypass power source that also feeds the maintenance bypass
line connects the static bypass line. Where a separate power source is not available, the bypass and
rectifier input supply connections are linked.
36
Operation
5.1.2
Static Transfer Switch
The circuit blocks labeled Static Switch in Figure 23 contain electronically controlled switching circuits that enable the critical load to be connected to either the inverter output or to a bypass power
source via the static bypass line. During normal system operation the load is connected to the
inverter; but in the event of a UPS overload or inverter failure, the load is automatically transferred
to the static bypass line.
To provide a clean (no-break) load transfer between the inverter output and static bypass line, the
static switch activates, connecting the load to bypass. To achieve this, the inverter output and bypass
supply must be fully synchronized during normal operating conditions. This is achieved through the
inverter control electronics, which make the inverter frequency track that of the static bypass supply,
provided that the bypass remains within an acceptable frequency window.
A manually controlled, maintenance bypass supply is incorporated into the UPS design. It enables the
critical load to be powered from the utility (bypass) supply while the UPS is shut down for routine
maintenance.
NOTE
When the UPS is operating in bypass mode or on maintenance bypass, the connected
equipment is not protected from power failures or surges and sags.
5.1.3
Battery Temperature Compensation
For 10-20kVA UPS with internal batteries, a standard temperature probe is installed to measure the
internal battery temperature to optimize battery management. The measured temperature can be
displayed from the UPS front panel.
For UPS with external batteries, an optional battery temperature interface equally optimises the
external battery management by connecting up to four external temperature sensors from the battery
cabinet(s) to a control unit inside the UPS.
Figure 24 Multiple battery temperature sensors
Temperature
Sensor
X103
NC
12V
OUT
GND
+
IN
TMP-2
Temperature
Sensor
X104
NC
12V
OUT
GND
+
IN
TMP-2
X108
+12V
OUT
GND
Temperature
Sensor
X105
NC
12V
OUT
GND
+
IN
-
BCB Control
Board – C2
X106
NC
12V
OUT
GND
+
IN
TMP-2
BCB Box
37
Monitor
Board
– U2
-12V
BAT-T
GND
UPS
TMP-2
Temperature
Sensor
X7
Operation
5.1.4
Redundant Control Power Supply Board
The UPS is equipped with two identical and fully redundant control power supply boards. Each of
them takes inputs from the AC and DC sources. When one of the sources or even if one of the control
power boards fails, the UPS system can still operate normally. This feature further enhances the reliability of the system.
5.1.5
Socket Outlet
One single-phase Shuko-type universal outlet of 3A current handling capability provides nominal
UPS output voltage of up to 3A current capacity for the ease of testing, commissioning & servicing of
the UPS.
5.2
Multi Module UPS—1+N
Multi-module UPS are formed by several “single unit” UPS modules to constitute “1+N”system where
groups of one or more, up to six, single units operate together for the purpose of providing additional
power or reliability or both. The load is equally shared between any paralleled UPS.
Figure 25 1+N multi-module UPS with external maintenance bypass switch
Qin UPS1
Qin UPS2
Qin UPS3
Qin Ext
Byp
Supplied by Others
Input Mains Supply
Input Mains Supply
L1,L2,L3,N
Q1
RECTIFIER
B1
STATIC
SWITCH
UPS1
OUTPUT
Qout UPS1
Qout all UPS
Bypass Mains Supply
L1,L2,L3,N
L1,L2,L3,N
RECTIFIER
B1
STATIC
SWITCH
RECTIFIER
B1
STATIC
SWITCH
INVERTER
INVERTER
L1,L2,L3,N
UPS2
OUTPUT
Qout UPS2
Distribution Cabinet
L1,L2,L3,N
Q1
Q1
INVERTER
L1,L2,L3,N
Input Mains Supply
Bypass Mains Supply
L1,L2,L3,N
L1,L2,L3,N
UPS3
OUTPUT
L1,L2,L3,N
Qout UPS3
Qout Byp
Further, single unit or 1+N groups may be configured as “distributed redundant” systems with independent outputs that nevertheless are synchronised through a Load Bus Synchroniser (LBS) so that
critical loads can be seamlessly transferred from one system to another. See 5.3 - Modes of Operation for more information.
38
Operation
5.2.1
Features of NX Multi-Module UPS Configurations
1. The hardware and firmware of single module UPS units is completely compatible with the
requirements of a multi-module system. Multi-module configuration is achieved merely through
settings in configuration software.
2. Parallel control cables are connected in a ring, providing both performance and redundancy.
Dual-bus control cables are connected between any two UPS modules of each bus. The intelligent
paralleling logic provides the user with maximum flexibility. For example, shutting down or
starting up UPS modules in a parallel system can be done in any sequence. Transfers between
Normal and Bypass modes of operation are synchronised and self –recovering e.g. following
overloads and their clearance.
3. The total load of the multi-module system can be queried from each module’s LCD display.
5.2.2
Requirements for Paralleling of UPS Modules
A group of paralleled modules behave as if it were one large UPS with the advantage of presenting
higher reliability. In order to assure that all modules are equally utilised and to comply with relevant
wiring rules, the following requirements apply:
1. All UPS modules must be of the same rating and must be connected to the same bypass source.
2. The bypass and the main input sources must be referenced to the same neutral potential.
3. Any RCD, Residual Current monitoring device, if installed, must be of an appropriate setting and
located upstream of the common neutral bonding point. Alternatively, the device must monitor
the combined 4-wire rectifier and split-bypass input currents of the system. Refer to the High
Leakage Current Warning on page 1.
4. The outputs of all UPS modules must be connected to a common output bus.
NOTE
Optional isolation transformers are available for applications where sources do not share the
same neutral reference or where the neutral is not available.
5.3
Modes of Operation
The NX UPS is an on-line, double-conversion, reverse-transfer UPS that permits operation in these
modes:
•
•
•
•
•
•
•
•
•
5.3.1
Normal Mode
Battery Mode (Stored Energy Mode)
Auto-Restart Mode
Bypass Mode
Maintenance Mode (Manual Bypass)
ECO Mode
Parallel Redundancy Mode
Hot-Standby Mode
Frequency Converter Mode
Normal Mode
The UPS inverter continuously supplies the critical AC load. The rectifier/charger derives power from
the AC mains input source and supplies DC power to the inverter while simultaneously FLOAT or
BOOST charging its associated backup battery.
5.3.2
Battery Mode (Stored Energy Mode)
Upon failure of the AC mains input power; the inverter, which obtains power from the battery, supplies the critical AC load. There is no interruption in power to the critical load upon failure or restoration of the AC mains input power after which the “Normal Mode” operation will continue without the
necessity of user intervention.
5.3.3
Auto-Restart Mode
The battery may become exhausted following an extended AC mains failure. The inverter shuts down
when the battery reaches the End Of Discharge voltage (EOD). The UPS may be programmed to
“Auto Recovery after EOD” after a delay time. This mode and any delay time are programmed by the
commissioning engineer.
39
Operation
5.3.4
Bypass Mode
If the inverter overload capacity is exceeded, or if the inverter becomes unavailable for any reason,
the static transfer switch will perform a transfer of the load from the inverter to the bypass source,
with no interruption in power to the critical AC load. Should the inverter be asynchronous with the
bypass, the static switch will perform a transfer of the load from the inverter to the bypass with interruption in power to critical AC load. This is to avoid paralleling of unsynchronised AC sources. This
interruption is programmable but typically set to be less than 3/4 of an electrical cycle, e.g., less than
15ms (50Hz) or less than 12.5ms (60Hz).
5.3.5
Maintenance Mode (Manual Bypass)
A manual bypass switch is available to ensure continuity of supply to the critical load when the UPS
becomes unavailable e.g. during a maintenance procedure. This manual bypass switch is fitted in all
UPS modules and rated for full load of one module.
5.3.6
ECO Mode (Single UPS Only)
IF ECO mode is selected, the double-conversion UPS operation is inhibited at most times for the purpose of saving energy. In this mode of operation, not unlike UPS of line-interactive or stand-by technology, the bypass is the preferred source and only when the voltage and / or frequency of the bypass
supply are beyond pre-defined and adjustable limits the critical AC load is transferred to the inverter.
This transfer takes place with an interruption of less than 3/4 of an electrical cycle, e.g., less than
15ms (50Hz) or less than 12.5ms (60Hz).
5.3.7
Parallel Redundancy Mode (System Expansion)
For higher capacity or higher reliability or both, the outputs of up to six UPS modules can programmed for directly paralleling while a built-in parallel controller in each UPS ensures automatic
load sharing.
5.3.8
Hot-Standby Mode
This is an alternative 1+1 redundancy application that ensures higher availability or better usage
control or both. Two UPS are connected in Hot Stand By mode as follows: UPS 1connects to the critical load, and UPS 2 connects to the bypass of UPS 1. The remaining AC inputs are connected to the
incoming AC mains supply. UPS 1 synchronises to the output of the UPS 2 ensuring uninterrupted
load transfer from UPS 1 to UPS 2 or vice versa. This ensures that any specified load is supplied by a
UPS while still providing a bypass path to cater for overloads. Further, the system can also be programmed to reverse UPS1 between Normal and Bypass Modes so that each UPS is equally utilised.
This interval is programmable from 1 to 4,320 hours (180 days).
5.3.9
Frequency Converter Mode
The NX UPS can be programmed into frequency converter mode for either 50Hz or 60Hz stable output frequency. The input frequency may vary from 40Hz to 70Hz. In this mode the static bypass operation is disabled, and the battery becomes optional depending on any requirement to operate in
battery mode (stored energy mode).
40
Operation
5.4
Battery Management—Set During Commissioning
5.4.1
Normal Function
• Constant charging current—Current can be set up to limit charging power.
• Constant boost voltage boost (if applicable)—Voltage of boost charging can be set as required
by the type of battery.
For Valve Regulated Lead Acid (VRLA) batteries, maximum boost charge voltage should not
exceed 2.4V / cell.
• Float Charge—Voltage of float charging can be set as required by the type of battery.
For VRLA, float charge voltage should be between 2.2V to 2.3V.
• Float Charge Temperature Compensation (optional)—A coefficient of temperature compensation can be as required by the type of battery.
• End of discharge protection (EOD)—If the battery voltage is lower than the EOD, the battery
converter will shut down and the battery is isolated to avoid further battery discharge. EOD is
settable from 1V to 1.9V per cell.
• Battery Low Warning Time—Settable between 3 and 60 minutes. The default is 5 minutes.
5.4.2
Advanced Functions (Software Settings Performed by the Commissioning Engineer)
Battery Self-Test and Self-Service
At periodic intervals 20% of the rated capacity of the battery will be discharged automatically at a
rate equal to 15% (kW) of the rated UPS (kVA) capacity. During discharge the rectifier provides the
balance necessary to feed the load. The minimum amount of load must exceed 20% of the nominal rating of the UPS module. If the load is less than 20%, auto-discharge cannot be executed. The periodic
interval can be set from 30 to 360 days. The periodic testing can also be inhibited.
• Conditions—Battery fully charged, load 20~100% of rated UPS capacity
• Trigger—Manually through LCD panel or automatically
• Battery Self-Test Interval—30-360 days (default setting is 60 days)
5.5
Battery Protection (settings by commissioning engineer)
Battery Undervoltage Pre-warning
The battery undervoltage pre-warning occurs before the end of discharge. After this pre-warning, the
battery should have the capacity for 3 remaining minutes discharging with full load. The time is user
configured from 3 to 60 minutes.
Battery End of Discharging (EOD) Protection
If the battery voltage is lower than the EOD, the battery converter will be shut down. EOD is settable
from 1V to 1.9V per VRLA cell (or 1.0 to 1.3 V per NiCd cell).
Battery Isolator Open Warning
If the battery isolator is open, this warning will occur.
The external battery to the UPS through an external battery isolator, which is manually closed and
electronically tripped via the UPS control circuits.
41
Operating Procedures
6.0
OPERATING PROCEDURES
!
WARNING
Hazardous mains and / or battery voltage present behind covers.
No user-serviceable parts are located behind covers that require a tool for their removal. Only
qualified service personnel are authorised to remove such covers.
6.1
Introduction
The NX can operate in any of four modes, as shown in Table 10. This section provides instructions on
switching between modes, resetting the UPS, switching the inverter On and Off and performing other
operations.
Table 10
UPS operating modes
Rotary Switch
Position
NORMAL
Operating Mode
Normal Operation
On Static Bypass
BYPASS or
NORMAL
On Test
TEST
On Maintenance
Bypass
MAINT
Description
The UPS is powering the load.
The load power is supplied through the static bypass line. This may be
considered as a temporary mode during load transfers between inverter
and maintenance bypass or supply under abnormal operating conditions.
No load power is supplied by the UPS. The load is connected to utility
power via the Maintenance Bypass Supply line. NOTE: The load is not
protected against disturbances in AC input power in this mode.
The UPS is shut down but the load is connected to utility power via the
Maintenance Bypass Supply line. NOTE: The load is not protected
against disturbances in AC input power in this mode.
NOTE
1. The user controls and indicators mentioned in these procedures are identified in 7.0 Operator Control Panel and Display.
2. The audible alarm may sound at various points during these procedures. It can be canceled
at any time by pressing the SILENCE ON/OFF push button.
NOTE
This unit refers to some modes and conditions that are set or adjusted using proprietary service
software. To take advantage of all the available features for the NX, the unit must be
commissioned by a Liebert factory-trained service engineer.
6.1.1
Power Switches
The UPS unit power switches are CB1 and SW1.
• CB1 - Input Isolator. Connects the utility supply to the UPS input.
• SW1 - Rotary switch. Has four positions—NORMAL, BYPASS, TEST and MAINT—that correspond to different positions of the SW1-A/B/C/D.
The positions of the rotary switch (SW1) are:
• SW1-A—Output Isolator. Connects the output of the UPS to the load.
• SW1-B—Neutral Isolator. Connects neutral to the UPS.
• SW1-C—Bypass Isolator. Connects the UPS with the bypass supply.
• SW1-D—Maintenance Bypass Isolator. Permits supply of the load directly by the bypass line for
maintenance of the UPS unit.
The functions of the rotary switch are shown in Table 11.
Table 11
Rotary switch configurations
Rotary Switch
Position
NORMAL
BYPASS
TEST
MAINT
OUTPUT (SW1-A)
BYPASS (SW1-C)
✔
✔
✔
✔
✔
MAINT
(SW1-D)
✔
✔
42
NEUTRAL (SW1-B)
✔
✔
✔
Operating Procedures
6.2
UPS Startup
The NX must be fully installed and commissioned before startup, and external power isolators must
be closed. Once those general conditions are met, the UPS may be started.
6.2.1
Start-Up Procedure
To start the UPS from a fully powered-down condition:
1. Open the UPS door to gain access to the main power switches.
!
WARNING
During this procedure the output terminals will become live.
If any load equipment is connected to the UPS output terminals, please check with the load
user and ascertain whether it is safe to apply power to the load. If the load is not ready to
receive power, then ensure that it is safely isolated from the UPS output terminals.
!
CAUTION
Do not operate the rotary switch too fast. Always wait at least three seconds when rotating
the switch from one position to another
2. Close CB1.
3. Turn the rotary switch to TEST.
The bypass contactor (M2) closes automatically and the LCD begins to show start-up screens. The
rectifier indicator flashes green while the rectifier is starting up. It stops flashing and becomes
solid green about 30 seconds after the rectifier enters the normal operation state. After initialization, the bypass static switch closes.
Because output switch SW1-A is still open, the UPS channels power through Maintenance Bypass
Supply line (SW1-D). The bypass indicator extinguishes, provided that the bypass is normal.
The UPS mimic display indicators will be:
Indicator
Rectifier indicator
State
Off
Battery indicator
Off
Bypass indicator
Off
Inverter indicator
Off
Load indicator
Off
Status indicator
Off
!
WARNING
Do NOT turn the rotary switch until the rectifier indicator stops flashing green.
4. Turn the rotary switch to BYPASS.
Indicator
State
Rectifier indicator
Green
Battery indicator
Off
Bypass indicator
Green
Inverter indicator
Off
Load indicator
Green
Status indicator
Amber
The maintenance switch SW1-D opens and output switch SW1-A closes. The UPS powers from
static bypass instead of from maintenance bypass. The bypass and load indicators turn on. The
design of the rotary switch ensures uninterrupted output.
43
Operating Procedures
5. Turn the rotary switch to NORMAL, then press the INVERTER ON control button for 2 seconds.
The inverter will start and the inverter indicator will flash green. After the inverter is ready, the
UPS transfers from bypass to inverter, the bypass indicator turns off and the inverter and load
indicators turn on.
The UPS is operating normally. The UPS mimic display indicators will:
6.2.2
Indicator
State
Rectifier indicator
Green
Battery indicator
Off
Bypass indicator
Off
Inverter indicator
Green
Output indicator
Green
Status indicator
Green
Verify Switching Between Operation Modes
Switch from normal mode to battery mode
• Open CB1 to enter battery mode. This breaks the utility connection to the NX.
To return to normal mode, wait a few seconds and close CB1. The rectifier will restart automatically after 10 seconds and resume feeding power to the inverter.
Switch from Normal Mode to Bypass Mode
• Press INVERTER OFF button to switch to bypass mode.
NOTE
In bypass mode, the load is being powered by the utility and is not receiving conditioned power
through the inverter.
Switch from Bypass Mode to Normal Mode
• Turn the rotary switch to NORMAL.
• In bypass mode, press the INVERTER ON button. When the inverter is ready, the UPS will
switch to normal mode.
44
Operating Procedures
6.3
Switching the UPS from Normal to Maintenance Bypass
Follow the procedure below to transfer the load from the inverter output to the Maintenance Bypass
line of the UPS.
!
CAUTION
Before performing this operation, read the messages on the LCD to be sure that bypass supply
is regular and the inverter is synchronous with it. If those conditions are not present, there is
a risk of a short interruption in powering the load.
This procedure assumes that UPS is operating normally.
1. Press the INVERTER OFF button on the right side of the operator control panel for longer than 2
seconds.
The Inverter indicator will turn off and the status indicator (6) will turn amber and an audible
alarm will sound. The load will transfer to static bypass and the inverter will shut off.
NOTE
Pressing the Alarm Silence Switch cancels the audible alarm, but leaves the warning message
displayed until the appropriate condition is rectified.
2. Open the UPS door to gain access to the main power switches, SW1 and CB1.
3. Turn the rotary switch to BYPASS position. The UPS Bypass Static Switch still supply power to
load.
4. Turn the rotary switch to TEST. The load is now on maintenance bypass.
5. Turn the rotary switch to MAINT.
6. Open rectifier switch CB1. All operator indicators and messages will turn off as the utility driven
internal power supplies decay. The unit will power down, but the load will continue to be supplied
by the manual maintenance bypass.
!
WARNING
!
WARNING
!
6.4
Wait 5 minutes for the internal DC busbar capacitors to discharge before attempting to
remove the internal protective barriers.
Even with the UPS rotary switch in maintenance bypass position portions of the unit are still
energized. Service is to be performed by qualified personnel only.
CAUTION
The load equipment is not protected from normal supply aberrations when operating in the
maintenance bypass mode.
Powering Down the UPS
To power down the UPS completely, follow the procedures in 6.3 - Switching the UPS from Normal to Maintenance Bypass.
To completely isolate the UPS from the AC supplies, the main external power input isolator (both isolators, where separate supplies are provided for rectifier and bypass) should be opened (see
Figure 26).
!
WARNING
To prevent injury to personnel, lockout or tagout the service supplies.
45
Operating Procedures
6.5
Powering Down the UPS and Maintaining Power to Load
NOTE
An external Maintenance Bypass Cabinet must be installed before attempting to perform the
following procedure
If the UPS needs to be shut down completely while maintaining power to the load, follow these steps:
1. Perform Steps 1 through 5 in 6.3 - Switching the UPS from Normal to Maintenance
Bypass.
2. Close the external maintenance bypass rotary switch to Maint position.
!
WARNING
!
WARNING
On the primary input distribution panel, which is often located distant from the UPS area, a
label should be posted advising service personnel that the UPS circuit is under maintenance.
Wait 5 minutes for the internal DC busbar capacitors to discharge.
The UPS is now completely powered down.
NOTE
The maintenance bypass power switch may be operated at any time while the UPS is powered
down to connect the load to the maintenance bypass supply if required
The procedure can be performed only after the installation has been completed (which includes the
maintenance bypass cabinet), after the system has been placed in operation by authorized personnel.
See Figure 26 for more information.
Figure 26 Example of configuration for single UPS with external maintenance bypass cabinet.
CB1
SW
CB2
3P
46
Operating Procedures
6.6
Emergency Shutdown With EPO
This circuit has been designed to switch off the UPS in emergency conditions (i.e., fire, flood, etc.). The
system will turn off the rectifier, inverter and stop powering the load immediately (including the
inverter and bypass), and the battery stops charging or discharging.
If the input utility is present, the UPS’s controls will remain active; however, the output will be
turned off. To remove all power from the UPS, the external feeder breaker should be opened.
6.7
Auto Restart
When the main and bypass sources fail, the UPS draws power from the battery system to supply the
load until the batteries are depleted. When the UPS reaches its end of discharge (EOD) threshold, it
will shut down.
The UPS will automatically restart and enable output power:
• After utility power is restored
• If “Auto Recovery after EOD Enabling” is enabled
• After the “Auto Recovery after EOD Delay Time” expires (the default delay is 10 minutes) During
the auto recovery delay, the NX will be charging its batteries to provide a safety margin for equipment shutdown if input power fails again.
If the “Auto Recovery after EOD Enabling” feature is disabled, the user may restart the system manually by pressing “Fault Clear” button.
6.8
Reset After Shutdown for Emergency Stop (EPO Action) or Other Conditions
Once all appropriate measures have been taken to correct the problem indicated by the alarm message appearing on the operator control panel display, carry out this procedure to restore the UPS to
regular operation following an EPO action or for the following reasons: Inverter Overtemperature,
Cut-off Overload, Battery Overvoltage, excessive switching (BYP: XFER COUNT BLOCK), etc.
When the user confirms that the fault is cleared:
1. Press the FAULT CLEAR button to clear all alarms.
2. Follow Steps 2- 6 in Section 6.3 to turn-off the UPS
3. Follow steps in Section 6.2.1to turn the UPS on.
After the EPO button is pressed, if the input utility is removed, the UPS will shut down completely.
When input utility is returned, if the rotary switch (SW1) is in either Bypass or in Normal position,
the UPS will start up on Bypass. There will be power at the output terminals of the UPS.
!
6.9
WARNING
If the rotary switch is in the Maint. position and input utility is present, there will be power at
the output terminals of the UPS.
Language Selection
The LCD menus and data display are available in 12 languages: Chinese, Dutch, English, French,
German, Italian, Japanese, Polish, Portuguese, Russian, Spanish and Swedish.To select a different
language than the one being displayed:
1. From the main menu, press the F1 (shift) key to move the cursor to the menu at the top of the
screen.
2. Press F2 and F3 (left and right arrows) as needed to select the Language menu.
3. Press F1 (shift) to move the cursor to the data and settings area of the LCD.
4. Use F2 and F3 (up and down) to select the required language.
5. Press the F4 (enter) key to accept the language selection.
6. Return to the main menu by repeatedly pressing F1 (ESC) as needed; all text on the LCD will now
be displayed in the selected language.
47
Operating Procedures
6.10
Changing the Current Date and Time
To change the system date and time:
1. From the main menu, press the F1 (shift) key to move the cursor to the menu at the top of the
screen.
2. Press F2 and F3 (left and right arrows) as needed to select the Settings menu.
3. Press F1 (shift) to move the cursor to the data and settings area of the LCD.
4. Use F2 and F3 (up and down) to select the Date & Time option, then press F4 (enter).
5. Position the cursor on the row in which the date and time are displayed, then press F4 (enter).
6. Using the F2 and F3 (up and down) keys, enter the current time and date information.
7. Press F4 (enter) to save the settings, then press F1 (ESC) to return to the main menu.
6.11
Command Password
Password protection is used to limit the control functions accessible to the operator. The default password is 123456. This password provides access to UPS and battery test functions.
48
Operator Control Panel and Display
7.0
OPERATOR CONTROL PANEL AND DISPLAY
7.1
Introduction
The operator control panel and display is located on the front door of the UPS. The panel is the access
point for operator control and monitoring of all measured parameters, UPS and battery status and of
event and alarm logs.
Figure 27 UPS control and display panel
The operator control panel is divided into three functional areas
Mimic Power Flow Chart
Graphic LCD monitor with menu keys
Direct Access keys
6
3
Status
1
4
Liebert Nxe
020kVA 3X3
2005-10-22
Single
17:32:20
Normal
8
5
Bypass
2
7
Output
L1-N/L2
L1-N/L2 voltage (V) 229.5
L-N current (A)
24.5
Frequency (Hz)
49.97
L-L voltage (V)
397.5
Power Factor
0.99
Rotary SW. normal pos.
Manual turn on
Normal mode
Load
L2-N/L3
229.5
24.5
49.97
397.5
1.00
07-07
07-07
07-07
L3-N/L1
229.5
24.5
49.97
397.5
0.99
EPO
INVERTER ON
INVERTER OFF
FAULT CLEAR
SILENCE ON /OFF
17:24
17:29
17:30
?
F1
Table 12
F2
F3
F4
HELP
UPS control and display panel components
Component #
Button
Function
Function
1
Rectifier (Input AC to DC)
EPO
Emergency Power Off button
2
Battery (DC Back-up)
Inverter ON
Inverter start button
3
Bypass Input
Inverter OFF
Inverter shutdown button
4
Inverter (DC to AC)
Fault Clear
Reset button
5
Load (AC Output)
Silence On/Off
Audible Alarm Mute
6
UPS Status and Alarm indicator
7
Audible Alarm (Buzzer)_
8
Emergency Power Off Button cover
—
F1-F4, Help
49
—
—
LCD Menu keys
—
Operator Control Panel and Display
7.1.1
Mimic Power Flow
The LEDs mounted on the mimic flow chart represent the various power paths and current UPS operational status.
Table 13
Green
Rectifier in Normal Operation
Flashing
Green
Input AC Normal, but rectifier not operating
Red
Rectifier Failed
Off
Rectifier Not operating, Input AC Not Available or out of normal range
Table 14
Battery indicator—2
Green
Battery Normal, but discharging and powering the load
Flashing
Green
Battery End of Discharge pre-warning
Red
Battery abnormal (Failed, Absent or Polarity Reversed) or Battery
Converter abnormal
(Failed, overcurrent, overtemperature)
Off
Battery and Converter Normal, Battery charging.
Table 15
Bypass indicator—3
Green
Load on Bypass power
Red
Bypass not available, out of normal range or Static bypass switch fault.
Off
Bypass Normal, load not on bypass
Table 16
Inverter indicator—4
Green
Inverter Normal and powering the load
Flashing
Green
Inverter ON, starting up, synchronising,
or standing by (ECO mode)
Red
Inverter failed
Off
Inverter not operating
Table 17
Load indicator—5
Green
UPS output ON and Normal
Red
UPS output ON and Overloaded
Off
UPS output OFF.
Table 18
7.1.2
Rectifier indicator—1
Status (Alarm) indicator—6
Green
Normal Operation
Yellow
UPS Warning e.g. AC Input Failure
Red
UPS fault e.g. Fuse or Hardware failure
Audible Alarm (Buzzer)
UPS activity is accompanied by the following sounds
Table 19
Audible alarm key
Single beep
Direct Access key acknowledgement
One beep
per second
UPS Warning e.g. AC Input Failure
Continuous
beep
Fault e.g. Fuse or Hardware failure
50
Operator Control Panel and Display
7.1.3
Direct Access Push Buttons (Keys)
Emergency Power Off (EPO)
Disconnects Power to the Load. Disables rectifier, inverter, static bypass
and battery operation.
Inverter ON
Enables Inverter Operation
Inverter OFF
Disables Inverter Operation
Fault clear
Resets blocked UPS functions (subject to any fault being cleared)
Silence ON/OFF
Toggle type buzzer mute. Any new fault re-enables the buzzer.
Press and hold Direct Access key briefly until acknowledged by a single beep.
7.1.4
LCD Monitor and Menu keys
The user-friendly and menu-driven 320 x 240 dot graphic LCD monitor displays real time data and at
the same time stores 512 historical records that can retrieve for reference and diagnosis.
The user can perform commands or easily browse through the input, output, load and battery parameters. For quick reference, the UPS status and any warnings are always highlighted without the need
of navigating through the menu. The versions of converter firmware, inverter firmware and internal
monitor firmware can also be displayed on the LCD.
Menu keys F1 to F4 are used to navigate within the graphic LCD monitor windows.
Table 20
Menu key Icons and their meaning
Key
F1
F2
F3
F4
Help
?
Window Type 1
LEFT
RIGHT
ENTER
Next Data Window
HELP
ESC
Window Type 2
Escape
UP
DOWN
Figure 28 Graphic LCD monitor windows and keypad
Liebert Nxe
20kVA 3X3
2005-10-22
Unit #1
Bypass
Main
A(AB)
220
20.5
50.1
380
0.99
Vphase V
Iphase A
Freq. Hz
Vline V
P.F.
Input breaker closed
Manual turn on
UPS in normal mode
17:32:20
Normal
Output
B(BC)
220
20.5
50.1
380
0.99
C(CA)
220
20.5
50.1
380
0.99
01-12 12:28:16
01-12 12:30:06
01-22 12:30:16
?
F1
F2
F3
51
F4
HELP
1 - UPS System
Window
2 - UPS Menu
Window
3 - UPS Data
Window
4 - Current Record
Window
5 - Keypad Window
Operator Control Panel and Display
The function of keys F1 to F4 is shown by a self-explanatory icon as appropriate for the particular
window. As shown in Figure 28 above, pressing F1 moves the cursor (resting in “OUTPUT”) from the
UPS Menu Window (2) to current record window (4) where it would first rest in “Input breaker closed’.
In a similar manner, pressing F2 would move the cursor from the Output data window to the Bypass
data window.
The summary menu tree is shown below. Refer to 7.2 - All Status and Event Messages Displayed
on the UPS Front Panel for a detailed description of each menu item.
Figure 29 Menu tree
Mains (input)
TX Input *
Bypass
Output
TX Output **
L-N voltage (V)
L-N current (A)
Frequency (Hz)
L-L voltage (V)
Power factor
L-N voltage (V)
L-L voltage (V)
L-N voltage (V)
Frequency (Hz)
L-L voltage (V)
L-N voltage (V)
L-N current (A)
Frequency (Hz)
L-L voltage (V)
Power factor
L-N voltage (V)
L-L voltage (V)
Load
System
Battery
Records
Sout (kVA)
Pout (kW)
Qout (kVAR)
Loadlevel %
Crest factor
Sout (kVA)
Pout (kW)
Qout (kVAR)
Single unit, no
parallel data
Battery voltage (V)
Battery current (A)
Battery temperature (°C)
Remain Time Min.
Battery capacity (%)
Battery boost charging
Battery float charging
Battery disconnected
(history log)
Language
Settings
Command
Version
(Choices for
display)
Display contrast
Date format set
Date & time
Comm1 baud rate
Comm2 baud rate
Comm3 baud rate
Communication address
Communication mode
Callback times
Phone No.1
Phone No.2
Phone No.3
Command password
Battery maintenance test
Battery capacity test
System test
Stop testing
UPS version
UPS model
* When configured, input transformer voltages are
displayed on the front LCD. When not activated, the
values are hidden.
** When configured, output transformer voltages are
displayed on the front LCD. When not activated, the
values are hidden.
52
Operator Control Panel and Display
7.1.5
Detailed Description of Menu Items
The description that follows refers to the graphic LCD monitor window shown on Figure 28.
UPS System Window: This fixed-pane window displays current time and date and identifies the UPS,
its configuration and its status.
Table 21
UPS system window
Description
Explanation
Liebert NX
UPS family name
2005-10-22
YYYY-MM-DD (see Settings menu for other date formats)
12:30:36
Current Time (24 hr HH:MM:SS format)
020kVA-3x3
20kVA = UPS rated output, 3 x 3 = 3-phase input and output
(Configuration)
Single = single double-conversion unit
ECO = single stand-by unit with double-conversion fall-back
Master = master in a 1+1 Hot Stand By system
Slave = slave in a 1+1 Hot Stand By system
Unit # 1 = of max 6 double-conversion units in a parallel system
Single, ECO, Master, Slave or Unit # 1
(Status)
Normal, Warning or Fault
Normal = UPS operating Normal
Warning = System attention required, e.g. AC Input Failure
Fault = UPS Fuse or Hardware Failure
Menu and Data Window
Use the horizontal arrow keys to navigate between any of the selectable menu and data windows.
Table 22
Menu
Type
Mains
(input)
TX Input
Bypass
Output
TX Output
Load
Descriptions of UPS menus and data window items
Item Type
Explanation
L-N voltage (V)
Phase voltage
L-N current (A)
Phase current
Frequency (Hz)
Input frequency
L-L voltage (v
Line-line voltage
Power factor
Power factor
L-N voltage (V)
Phase voltage
L-L voltage (V)
Line-line voltage
L-N voltage (V)
Phase voltage
Frequency (Hz)
Bypass frequency
L-L voltage (A)
Line-line voltage
L-N voltage (V)
Phase voltage
L-N current (A)
Phase current
Frequency (Hz)
Input frequency
L-L voltage (V)
Line-line voltage
Power factor
Power factor
L-N voltage (V)
Phase voltage
L-L voltage (V)
Line-line voltage
Sout (kVA)
Sout: Apparent power
Pout (kW)
Pout: Active power
Qout (kVAR)
Qout: Reactive power
Loadlevel %
The percent of the UPS rating load
Crest factor
Output current Crest Factor
53
Operator Control Panel and Display
Table 22
Menu
Type
System
Battery
Descriptions of UPS menus and data window items (continued)
Item Type
Explanation
Sout (kVA)
Sout: Apparent power
Pout (kW)
Pout: Active power
Qout (kVAR)
Qout: Reactive power
Single unit, no parallel data
When configured as a single unit, UPS has only native load, no system
load.
Battery voltage (V)
Battery bus voltage
Battery current (A)
Battery bus current
Battery temperature (°C)
Internal battery temperature °C
Remain Time Min.
Battery run time remaining
Battery capacity (%)
Percentage of battery life remaining
Battery boost charging
Battery is boost charging
Battery float charging
Battery is float charging
Battery disconnected
Battery is not connected
Records
(history log)
Displays all records in the history log
Language
(choices for text displayed)
User may select any of 12 languages for LCD text.
Display contrast
Adjust the LCD display contrast
Date format set
Choose the format for date display: M/D/Y, D/M/Y, M/D/Y, Y/M/D
Date & time
Set the date and time
Comm1 baud rate
Communication baud rate setting for Intellislot 1
Comm2 baud rate
Communication baud rate setting for Intellislot 2
Comm3 baud rate
Communication baud rate setting for Intellislot 3
Settings
Command
(start/stop
battery &
system
tests)
Version
Communication address
This setting is applicable to RS485 communication mode
Communication mode
Communication Mode Setting
Callback times
When Intellislot 1 Communication mode is Modem, this parameter sets
the number of times a number is redialed to send an alarm notification.
Phone No.1
When Intellislot 1 Communication mode is Modem, this is the first
phone number to be dialed (to send an alarm notification).
Phone No.2
When Intellislot 1 Communication mode is Modem, this is the second
phone number to be dialed (to send an alarm notification).
Phone No.3
When Intellislot 1 Communication mode is Modem, this is the third
phone number to be dialed (to send an alarm notification).
Command password
User can modify the command password.
Battery maintenance test
This test performs a partial discharge of the battery to obtain a rough
estimate of the battery capacity. Load must be between 20% and 80%.
Battery capacity test
This test performs a full discharge of the battery to obtain a precise
measure of the battery capacity. Load must be between 20% and 80%.
System test
This is a self-test of the UPS. When the user activates this function, a
pop-up window appears about 5 seconds later to show the results.
Stop testing
Manually stops a battery maintenance test, battery capacity test or
system test.
UPS version
Provides UPS firmware version numbers for the inverter, rectifier and
software display board.
UPS model
Provides UPS model information—for example, 208V-60Hz.
54
Operator Control Panel and Display
Current Record Window
Keeps a log the events that resulted in the current mode of operation. Ignores transient conditions
that have been resolved.
Use “page” (F1) and up / down arrow to read the events.
For a complete history log, refer to the Records tab of the Menu and Data Window.
Refer to Table 23 for a complete list of supported status messages.
7.2
All Status and Event Messages Displayed on the UPS Front Panel
This is the complete list of UPS events and status messages supported for display in either the Record
window (Historic data) or in the Current window (Prevailing data) as described in 7.1.4 - LCD Monitor and Menu keys.
Table 23
UPS messages
Message
Description / Suggested Action (if any)
Inverter Comm. Fail
Internal RS485 communication failure between monitor and inverter
Rectifier Comm. Fail
Internal RS485 communication failure between monitor and rectifier
Parallel Comm. Fail
The CAN communication between different UPSs within a parallel system fails.
1.Check if there are some UPSs not powered on in the parallel system. If so, power
on these UPSs and check if the alarm disappears.
2. Press Fault Clear push button.
Battery Overtemp.
The Battery temperature is over limit. Check the battery temperature and ventilation
Ambient Overtemp.
The Ambient temperature is over limit. Check the ventilation of UPS room.
Battery Fault
Battery detected faulty (Reserved)
Battery Replaced
Battery test failed, Battery should be replaced.
Battery Low Pre-warning
Before the end of discharge, battery undervoltage pre-warning should occur. After this
pre-warning, battery should have the capacity for 3 minutes discharging with full load.
The time is user-configured from 3 to 60 minutes.
Shut down the load in time.
Battery End of Discharge
Inverter turned off due to low battery voltage. Check the utility failure and try to
recover it.
Mains Volt. Abnormal
Mains Voltage exceeds the upper or lower limit and results in rectifier shutdown.
Check the input line-to-neutral voltage amplitude of rectifier.
Mains Undervoltage
Mains Voltage is undervoltage with derated load.
Check the input line-to-line voltage amplitude of rectifier
Mains Freq. Abnormal
Mains frequency is out of limit range and results in rectifier shutdown.
Check the rectifier’s input voltage frequency
Rectifier Fault
Rectifier detected faulty. Rectifier shuts down. Battery discharges.
Rectifier Overtemp.
The temperature of heat sink is too high to keep the rectifier running.
The UPS can recover automatically. Check the environment and ventilation.
Batt. Contactor Fail
Battery contactor or circuit breaker not responding to control signals.
Batt. Charger Fault
The voltage of the battery charger is too high.
Control Power 1 Fail
UPS operates but Redundant Control Power is not available.
Mains Phase Reversed
AC Input phase sequence is reversed.
Rectifier Overcurrent
Rectifier is overloaded.
Soft Start Fail
Rectifier could not start due to low DC bus voltage
55
Operator Control Panel and Display
Table 23
UPS messages
Message
Description / Suggested Action (if any)
Bypass Unable to Trace
This alarm is triggered by an inverter software routine when the amplitude or
frequency of bypass voltage is beyond the normal range.
The amplitude threshold is fixed for positive and negative 10% rating.
This alarm automatically resets once the bypass voltage goes normal.
1. First verify that the bypass voltage and frequency displayed on the panel is within
the selected range. Note here the rated voltage and frequency are specified by
“Output voltage level” and “Output frequency level” respectively.
2. If the displayed voltage is believed to be abnormal, then verify the bypass voltage
and frequency presented to the UPS. Check the external supply if it is found to be
faulty.
Bypass Abnormal
This alarm is triggered by an inverter software routine when the amplitude or
frequency of bypass voltage exceeds the limit.
This alarm automatically resets once the bypass voltage goes normal.
First check if there are some relevant alarms such as “Bypass disconnect open”,
“Bypass phase reverse” and “Mains neutral lost”. If they appear, solve them first.
1. Then verify that the bypass voltage and frequency displayed on the panel is within
the bypass limit. Note here the rated voltage and frequency are specified by “Output
voltage level” and “Output frequency level” respectively.
2. If the displayed voltage is believed to be abnormal, then verify the bypass voltage
and frequency presented to the UPS. Check the external bypass supply if it is found
to be faulty. If the utility is likely to trigger this alarm frequently, the bypass limit can be
changed a little larger through the configuration software according to the customer’s
agreement.
Inverter Asynchronous
This alarm is triggered by an inverter software routine when the inverter and bypass
waveforms are misaligned by more than 6 degrees in phase. This alarm resets
automatically once the condition is no longer true.
1. First check if the alarm “Bypass unable to trace” or “Bypass abnormal” occurs. If so,
solve it first.
2. Verify the waveform of the bypass voltage. If it is too distorted, ask the customer to
verify and seek any possible measurements.
Inverter Fault
Inverter output voltage beyond limits. Load transfers to bypass.
Inverter Overtemp.
The temperature of the inverter heat sink is too high to keep inverter running.
This alarm is triggered by the signal from a temperature monitoring thermostat on the
inverter bridge heat sink.
The UPS will recover automatically after a 5 minute delay from the disappearance of
the overtemperature signal.
If the overtemperature condition is true, then check for and verify:
1. high ambient air temperature.
2. blocked cooling airway.
3. any fan failure.
4. prolonged inverter overload
Fan Fault
At least one of the cooling fans has failed
Inverter STS Fail
At least one of the static switches of inverter side is open or short circuit. This fault is
locked until power off.
Bypass STS Fail
At least one of the static switches of bypass side is open or short circuit. This fault is
locked until power off
Operation Invalid
This record is registered following an incorrect operation:
Output Fuse Fail
At least one of the inverter output fuses is blown. Inverter shuts down. Load transfers
to bypass.
Control Power 2 Fail
UPS operates but Redundant Control Power is not available.
Unit Over load
The UPS is confirmed to be overload when the load arises above 105% nominal
rating.
The alarm automatically resets once the overload condition is removed.
1. Confirm that the alarm is true by checking the load percent indicated on the LCD
panel to determine which phase is being overloaded.
2. If the alarm is true, measure the actual output current to verify that the indications
are valid.
Disconnect unnecessary load and ensure the safety. In a parallel system, a severe
load sharing error can also leads to the alarm.
56
Operator Control Panel and Display
Table 23
UPS messages
Message
Description / Suggested Action (if any)
System Over load
The UPS parallel system is confirmed to overload when the total load arises above
105% nominal rating for the set basic number of UPSs. The alarm automatically
resets once the overload condition is removed.
1. Confirm that the alarm is true by checking the system load percent indicated on the
LCD panel to determine which phase is being overloaded.
2. If the alarm is true, measure the actual output current to verify that the indications
are valid.
Disconnect unnecessary load and ensure the safety. In a parallel system, a severe
load sharing error can also leads to the alarm.
Unit Over load Timeout
The UPS is confirmed to overload and the overload times out.
Note 1: the highest loaded phase will indicate overload timing-out first.
Note 2: When the timer is active then alarm “unit overload” should also be active as
the load is above nominal.
Note 3: When the timer has expired, the inverter Static Switch is opened and the load
transferred to bypass. The inverter shutdown and will restart after 10 seconds.
Note 4: If the load decreases lower than 95% after 5 minutes, the system will transfer
back to inverter mode.
Confirm that the alarm is genuine by checking the load percent indicated on the LCD.
If an overload is indicated then check the load, and investigate any additional load
connected prior to the alarm (if applicable).
Byp. Abnormal Shutdown
Both bypass and inverter voltages unavailable. Load interruption
Inverter Over Current
Inverter Pulse Width Modulation module overloaded.
Bypass Phase Reversed
The phase sequence direction of bypass voltage is reversed.
Normally, the phase of phase B lags 120 degrees behind phase A, and the phase of
phase C lags 120 degrees behind phase B.
Verify that the phase rotation of the bypass supply presented to the UPS is correct,
and rectify it if it is found to be in error
Load Impact Transfer
A transfer to bypass occurred due to a large step load. The UPS should recover
automatically. Turn on connected equipment in sequential order to reduce the step
loading of the inverter.
Transfer Time-out
The load is on bypass power due to excessive number of transfers that occurred
within the last hour.
The UPS will recover automatically and will transfer the load back to inverter power
within an hour.
Load Sharing Fault
UPS modules within a parallel system are not sharing the load current equally.
DC Bus Abnormal
DC input voltage to inverter beyond limits. Inverter shuts down. Load transfers to
bypass.
System Transfer
The whole paralleled UPS system transferred to bypass at the same time. This
message will appear on the UPS which passive transfer to bypass
Parallel Board Fault
Malfunction of the paralleling control circuits of this UPS module. Can cause “System
Transfer” to bypass.
DC Bus Over Voltage
Rectifier, inverter and battery converter were shutdown because DC bus voltage is
too high. Check whether there is a fault in rectifier side. If no, then check whether
overload occurs. Restart the inverter after resetting the fault
Parallel Connect Fault
The parallel cables are not connected correctly in a parallel system.
Reset the fault by pressing the "fault clear" button, then restart the inverter by
pressing the "inverter on" button.
Bypass Over Current
Bypass current is over limit above 135% rating. The UPS just alarms and does
nothing.
LBS Active
Load Bus Synchronisation is active. The UPS is acting as an LBS master or slave in a
dual bus configuration.
Setting Save Error
History records not saved. (Reserved)
Mains Neutral Lost
AC Input mains reference neutral not detected.
Protocol version clash
Firmware incompatibility between Monitor Board and Digital Signal Processor Board.
Battery ground fault
Battery leakage to ground detected (option)
Manual Turn On
Manual Turn On via front panel
Manual Turn Off
Manual Turn Off via front panel
57
Operator Control Panel and Display
Table 23
UPS messages
Message
Description / Suggested Action (if any)
EPO
Emergency Power Off direct access key pressed or external command received
Transfer Confirm
Prompt to press “enter” key to acknowledge that an interrupted load transfer to
bypass will happen.
Transfer Cancel
Prompt to press “ESC” key to avoid that an interrupted load transfer to bypass will
happen.
Unit Off Confirm
Prompt to press “enter” key to acknowledge that the UPS will be disconnected from
other paralleled UPS modules.
System Off Confirm
Prompt to press “enter” key to acknowledge that the all paralleled UPS will be
disconnected from the load.
Fault Reset
Fault clear direct access key pressed
Alarm Silence
Silence On/Off direct access key pressed
Turn On Fail
Inverter failed to turn on when Inverter On direct access key was pressed. This may
be as a result of Invalid Operation (Maintenance bypass on) or DC bus or rectifier not
ready.
Alarm Reset
Fault clear or Silence On/Off direct access key pressed
Bypass Mode
Load supplied from AC input bypass supply.
Normal Mode
Load supplied from Inverter output through double conversion of the AC mains input
supply.
Battery Mode
Load supplied from Inverter output through double conversion of the Battery supply.
Source share mode
Load supplied from Inverter output through shared double conversion of the AC
mains input supply and of the Battery supply.
UPS Shutdown
UPS Shutdown, output power-down
Check UPS Output
Inverter off during normal startup (diagnostics information only)
Generator Connected
Generator active signal received. Source share mode may be activated pending UPS
settings.
BCB open
Battery Circuit Breaker status (open)
BCB closed
Battery Circuit Breaker status (closed)
Battery Float Charging
Battery status (Float charge mode)
Battery Boost Charging
Battery status (Boost charge mode)
Battery Discharging
Battery status (discharge mode)
Battery Period Testing
Automatic periodic battery maintenance discharge test (20% capacity discharge)
Batt. Capacity Testing
User initiated battery capacity discharge test (100% capacity discharge)
Batt. Maint. Testing
User initiated maintenance discharge test (20% capacity discharge)
UPS System Testing
User initiated UPS self test
Inverter in Setting
Inverter starting up and synchronising
Rectifier in Setting
Rectifier starting up and synchronising
MBP-T cabinet Fan Fault
Maintenance bypass cabinet fans fault.
Ext Input TX Overtemp
External Input Isolation Transformer Over Temperature
Ext Output TX Overtemp
External Output Isolation Transformer Over Temperature
Battery Room Alarm
Environment in Battery Room Needs Attention
Rotary Sw. Test Pos.
Rotary switch is in test position.
Rotary Sw. Normal Pos.
Rotary switch is in normal position.
Rotary Sw. Bypass Pos.
Rotary switch is in bypass position.
Rotary Sw. Maint. Pos.
Rotary switch is in maintenance position.
Battery Contactor Open
Battery Contactor Open
Battery Contactor Close
Battery Contactor Closed
Battery Reverse
Connect the battery again and check the wiring of batteries
No Battery
Check the battery and the wiring of batteries
Auto start
After UPS was shutdown at EOD, inverter auto starts when utility restore
58
Operator Control Panel and Display
7.3
Prompt (Pop-Up) Windows
The prompt window is displayed during the operation of the system to alert the user to certain conditions and / or to require user confirmation of a command.
Table 24
7.4
Prompt windows, meanings
Prompt
Meaning
Transfer with interrupt, please confirm or cancel
Inverter and Bypass supplies are not synchronised and
any load transfer between the supplies will cause a brief
load interruption.
The load is too high to be transferred with interrupt
The total load must be less than the capacity of one unit
to allow a parallel system to perform an interrupted
transfer from bypass to inverter.
This Operation Leads to Output Shutdown, Confirm or
Cancel
No alternative supply is available and any Inverter Off
operation will cause the load to be de-energised.
This operation leads to inverter overload, confirm or
cancel
The turn-off this inverter will lead to the overload of
remaining inverter(s) in a parallel system.
Turn on more UPS to carry current load
The number of paralleled inverters already turned on is
insufficient to carry the existing load.
Battery will be depleted, confirm
Battery Capacity test discharges the battery 100%
System self test finished - everything is ok.
No action required
System self test finished - Please check the current
warnings.
Check “Current Records” window
Enter control password
Required for Battery or UPS test (default = 12345)
Dynamic Energy Flow Chart and UPS Help Screen
This screen displays a mimic diagram of the UPS that includes energy flow and status of isolation and
transfer switches. Press the “Help” key to activate this screen. Press again to toggle between this
screen and the main screen.
Figure 30 Help screen
Help information
Select the current record window
Select the previous menu item
Press help key back to main menu
F1
F2
F3
59
F4
HELP
Operator Control Panel and Display
7.5
Default Screen Saver
This default screen is displayed following at least 2 minutes of operation with no new alarm. After
another delay, the backlight turns off. Press any key to reactivate the screen.
Figure 31 Default screen
Liebert Nxe
20 kVA-3x3
2005-05-22
UNIT #1
12:30:36
NORMAL
Press any key, back to main menu
F1
F2
F3
60
F4
HELP
Options—For Assembly Inside the UPS Cabinet
8.0
OPTIONS—FOR ASSEMBLY INSIDE THE UPS CABINET
Several items of optional equipment are available for connection to the Liebert NX UPS. These are
described in this section of the manual and should be fitted prior to installation.
8.1
Protection
8.1.1
Battery Ground Fault Detection
In addition to any residual current device mounted externally and upstream the UPS or when
optional isolation transformers are fitted to the UPS, an optional residual battery current device can
be fitted to detect leakage current from the battery into the PE (Protective Earth) Residual current
range monitored: 30~3000mA.
Power supply voltage for the set: AC230V (L-N);
When a battery ground fault is detected, an alarm will appear on the UPS display panel.
An additional Dry contact fault Alarm signal is available for remote monitoring:
Table 25
Terminal
21
Dry contact fault alarm signal is available for remote monitoring
Name
Definition
Common
Battery Ground Fault Detection – can be
programmed as Alarm or Pre-Alarm
22
NC
24
NO
The Battery ground fault detection set contains one CT (current transformer) and one DC sensitive
residual current monitor. The connection of this set for UPS is illustrated as follows.
Figure 32 Battery ground fault detection set connections
Current
Transformer
W1-A358
Battery
BCB or
Contactor
X
Batt-N
K1
Socket
Output
Phase
K2
I2
Monitor Board
-U2
I2
A1
11
4 +12V
A2
14
2
IN DRY-X3
Output
Neutral
Battery Ground
Fault Detection
Resys B470
(AC230)
BtG
The Battery Ground Fault Detection Set is assembled within the UPS cabinet.
61
UPS
Options—For Assembly Inside the UPS Cabinet
8.1.2
Redundant Fan for Power Module
In addition to ensure sufficient cooling power at various operation modes with 100% rated load, a
redundant power module fan set can be supplied, thus ensuring continuity of UPS operation even
with the failure of some fans. No extra footprint is required.
Figure 33 Redundant power module fan set
Redundant AC Fan
Fan120
Fan120
W354
(AC Fan 1-3)
W354
Fan120
(AC Fan 1-2)
W354
W354
(AC Fan 1-1)
Standard AC Fan
(AC Fan 1-4)
Fan120
W353 X1_J6
TOP VIEW
Figure 34 Communication bays and cable location
Location
Preferred Device This Location
RS-232-1 DB-9 (COM Port 1) - Serial MultiLink Software
(Port Setting 2400 Baud)
RS-232-2 DB-9 (COM Port 2 - Service Access Software
(Port Setting 9600 Baud)
DB-9
Monitor
Board
Location
Top Bay (COM Port 1)
Mid Bay (COM Port 2)
Bottom Bay (COM Port 3)
Preferred Device This Location
Relay Card (no port setting req’d)
Multiport4 (no port setting req’d)
OCWeb LB / OC485 (port setting 24
Top
Mid
Suggested routing of customer-supplied
communication cables
Gland plate for cable exit
Notes:
a) All Intellislot cards are supported in any bay.
b) Port sharing is:
- PERMITTED between RS232-x DB9 devices and Relay /
Multiport4 Intellislot cards (i.e., Serial Multilink software
will work from RS232-1 DB9 also when relay card is
inserted in the top bay.
- NOT PERMITTED between RS-232-x D-B9 devices and
OCWeb / OC485 cards (i.e., Serial MultiLink software will
not work from RS232-1 DB-9 when OCWeb card is inserted
in the top bay.
62
Options—For Assembly Inside the UPS Cabinet
8.1.3
OC Web Card - SNMP/HTTP Network Interface Card
This network interface card provides all real-time data and status information as SNMPv1 traps for
connection to a 10/100-baseT Ethernet network and in addition the same card will also transmit the
same status information and all measured parameters for display via a Web browser.
This card is supported in the top, middle and bottom Intellislot bays.
Figure 35 OC Web Card data summary window
Figure 36 OC Web Card battery data summary
63
Options—For Assembly Inside the UPS Cabinet
8.1.4
Relay Card
The Relay card provides voltage-free contact closures for remote monitoring of alarm conditions.
Delivering On Battery, On Bypass, Low Battery, Summary Alarm, UPS Fault and On UPS signals,
the easy-to-install card integrates with AS/400 computers (additional cable required) and other relay
contact monitoring systems.
The Relay card is rated for 24 VAC/VDC at 1A and supported in any of the three NX Intellislot bays.
Table 26
Relay Card pin configuration
Pin
Function
Operation
Closed if no UPS failure
1
UPS Fault
2-3
Not Used
4
UPS Fault
Closed if UPS fails
5
Summary Alarm**
Closed if SUMMARY ALARM** occurs
6
Summary Alarm**
Closed if no alarm conditions are present
7
Any Mode Shutdown return
Not – use External EPO terminal
8
Not Used
9
Common - Low Battery
10
Low Battery
Closed if battery is OK
Low Battery
Closed if LOW BATTERY point occurs.
11
12-13
Not Used
14
UPS Any Mode Shutdown
Not support– use External EPO terminal
15
On UPS
Closed if ON UPS (inverter) power
16
On Battery
Closed if ON BATTERY power (Utility failure)
17
Common - UPS Fault, Summary Alarm,
On UPS, On Battery, On Bypass
18
19 ÷ 23
On Battery
Closed if not ON Battery power (Utility OK)
Not Used
24
On Bypass
25
Not Used
Closed if ON BYPASS
**A Summary Alarm occurs when any of the following conditions exist:
•
•
•
•
Utility power is out of the acceptable range (voltage and/or frequency)
UPS is in BYPASS MODE (load not on Inverter power)
UPS Battery is LOW
UPS fault has occurred
Table 27:
#
8.1.5
Connection
Description
JP01
Pin 9 to Pin 17
Allows all relay COMMONS to be tied together.
JP02
Pin 7 to Pin 17
REMOVE - (Interconnects all relay COMMONS and the (not supported)
ANY MODE SHUTDOWN Return.
Multiport-4 Card
The Multiport-4 card provides 4 sets of voltage-free contact closures for remote monitoring of alarm
conditions UPS operation On Battery and battery low condition. A typical application is to allows a
maximum of four computer systems to simultaneously monitor the status (e.g., utility power failure /
low battery) of a single UPS.
This card is supported in any of the three NX Intellislot bays.
64
Options—For Assembly Inside the UPS Cabinet
Figure 37 SiteNet MultiPort4 Intellislot pin configuration
CPU
CPU
UPS
CPU
CPU
Table 28
Pin
SiteNet MultiPort4 Intellislot pin assignment
Assignment
Description
1
Low Battery
2
Not Used
3
Not Used
4
Not Used
5
Not Used
6
Not Used
7
Low Battery Common
8
Utility Fail Common
9
Utility Fail
65
Options—For Assembly Inside the UPS Cabinet
8.2
OC485 Web Card – Modbus, Jbus, IGM Net
The OpenComms 485 Card facilitates SiteScan Web or Building Management Systems monitoring.
The RS232 port is used for connection to a personal computer for setting up.
The RS-485 port supports IGM Net and Modbus/JBus protocols and maps the operation of the UPS
including status, alarms and data (voltages, currents, frequency, power, power factor, temperatures
etc.)
Figure 38 OC485 Web card
Table 29
NX communication options
Physical
description
of port
Top
Intellislot
Labeled
ID Name
of Port
Intellislot 2
(On Monitor Board)
On the UPS
LCD screen,
under Settings,
controlled by:
Comm 1
Monitoring
Devices
supported
Multiport 4
any
Relaycard-int
any
OCWEB-LB
Modbus/Jbus
Middle
Intellislot
Intellislot 1
(On Monitor Board)
Comm 2
Relaycard-int
any
OCWEB-LB
8.2.1
Comm 3
Top
DB9 port
RS232-1
Comm 1
Bottom
DB9 port
RS232-2
Comm 2
2400
Not simultaneous with
Multilink in RS232-2
any
any
OCWEB-LB
2400
Modbus/Jbus
2400
Multilink Serial
Not simultaneous with
Multilink in RS232-2
2400
Relaycard-int
Multilink Serial
Comments
2400
any
Multiport 4
Intellislot 3
(On Monitor Board)
2400
Multiport 4
Modbus/Jbus
Bottom
Intellislot
Baud
rate
9600
2400
Not simultaneous with Web
card in middle intellislot.
Remote Alarm Monitor
Status and alarm conditions are available on an optional remote alarm monitor (RAM) panel that is
driven by volt-free alarm status contacts from an optional relay alarm board.
66
Technical Specifications
9.0
TECHNICAL SPECIFICATIONS
9.1
Conformity and Standards
The UPS has been designed to conform to the following European and international standards:
Table 30
Compliance with European, international standards
Description
Normative reference
General and safety requirements for UPS used in
operator access areas
EN 50091-1-1 /IEC 62040-1-1 / AS 62040-1-1
Electromagnetic compatibility (EMC) requirements for
UPS
EN 50091-2 / IEC 62040-2 / AS 62040-2 (Class A)
Method of specifying the performance and test
requirements of UPS
EN 50091-3 / IEC 62040-3 / AS 62040-3 (VFI SS 111)
The product standards in Table 30 incorporate relevant compliance clauses with generic IEC and EN
standards for safety (IEC/EN/AS60950), electromagnetic emission and immunity (IEC/EN/AS61000
series) and construction (IEC/EN/AS60146 series and 60529).
Table 31
Environmental characteristics
Unit of
Measurement
10
15
20
Acoustic Noise Level at 1 Meter (39 in)
dBa
51.0
51.5
51.6
Altitude of Operation
m (ft)
≤1000m (3280 ft) above sea level
de-rate power by 1% per 100m(328 ft) between
1000 and 2000 m (3280 and 6560 ft)
-
0 to 95% non condensing
Operating Temperature
°C (°F)
0 to 40 (32-104°)
Battery life is halved for every 10° (18°) increase
above 20° (68°)
Storage-Transport Temperature for UPS
°C (°F)
-20 to 70 (-4 to 158)
Recommended Battery Storage
Temperature
°C (°F)
-20 to 30 (-4 to 86)°F)
(20°C [68°F] for optimum battery storage)
Rated power, kVA
Relative Humidity
Table 32
Overall efficiency, heat losses and air exchange
Unit of
Measurement
10
15
20
Normal Mode (dual conversion)
%
90.4
91.2
91.3
ECO Mode
%
93.2
94.2
94.7
Rated Power,
kVA
10
15
20
Battery Mode
%
91.3
91.7
92.0
Rated Power
kVA
10
15
20
Normal Mode (full load, battery charged)
kW
1.6
1.8
2.2
ECO Mode (full load, battery charged)
kW
1.3
1.4
1.4
No Load
kW
1.3
1.3
1.3
Rated Power, kVA
Inverter Efficiency (DC/AC)
(battery at nominal voltage 480VDC and full-rated linear load)
Heat Loss & Air Exchange (Ventilation)
Forced Air Cooling (front intake, back exhaust)
Input and output voltage 400VAC, battery charged, full rated linear load
67
3
L/sec (m /hr)
254 (917)
Technical Specifications
Table 33
Mechanical characteristics
Unit of
Measurement
Rated Power, kVA
Dimensions, WxDxH
10
15
20
600x700x1400
(23-9/16x27-5/8x55)
mm (in)
Mass
Mass without batteries
kg (lb)
180 (397)
204 (450)
204 (450)
Mass with internal batteries
(with typical 12Ah battery)
kg (lb)
550 (1213)
574 (1265)
574 (1265)
Finish
N/A
Pantone 877 (Silver grey)
equivalent Becker Silver epoxy polyester powder 04137-2
Protection Degree, IEC (60529)
N/A
IP20 (finger-proof with front doors open or closed)
Table 34
Rectifier AC input (mains)
Rated Power, kVA
Unit of
Measurement
10
15
20
Rated AC Input Voltage 1
VAC
380/400/415
(3-phase and sharing neutral with the bypass input)
Input Voltage Tolerance 2
VAC
305V to 477V
304V to 208V (output derated below 70%)
Hz
50/60Hz (tolerance 40Hz to 70Hz)
kW/kVA, full load
(half load)
0.99 (0.98)
Frequency 2
Power Factor
Input Power
Input Current
Harmonic Current
Distortion
Duration of Progressive
Power Walk-In
kVA rated 3
(maximum 4)
10.0 (15.9)
13.9 (19.6)
18.4 (24.0)
A rated 3 (maximum 4)
15 (22)
20 (28)
27 (35)
THDI % FL
3
3
3
10 seconds to reach full rated current
(selectable 5 through 30 seconds in 5 second
intervals)
sec
1. Rectifier operates at any of the rated supply voltages and frequencies without further adjustment.
2. At 305V input mains the UPS maintains the specified output voltage at rated load without discharging a previously charged
battery
3. IEC 62040-3 / EN 50091-3: at rated load and input voltage 400V, battery charged
4. IEC 62040-3 / EN 50091-3: at rated load and input voltage 400V, battery charging at maximum rated power.
68
Technical Specifications
Table 35
Battery
Intermediate DC Circuit
Rated Power, kVA
Unit of
Measurement
Battery Bus Voltage
10
15
20
Nominal: 480V (VRLA Float charge is 540V)
Range: 400V - 600V
VDC
Number of Lead-Acid Cells
Nominal
Maximum
Minimum
Float Voltage
240 = [40 x 6-cell (12V) blocks]
264 = [44 x 6-cell (12V) blocks]
228 = [38 x 6-cell (12V) blocks]
2.25 V/cell (selectable from 2.2 –2.3V/cell)
Constant current and constant voltage (IU) charge mode
- 3.0 (selectable 0 to – 5.0 around 25°C or 30°C. or inhibit)
≤1
≤5
2.35 V/cell (selectable from 2.30-2.40V/cell)
Constant current and constant voltage (IU) charge mode
- float-boost current trigger 0.050 C10 (selectable 0.030-0.070)
- boost-float current trigger 0.010 C10 (selectable 0.005-0.025) with
24 hr safety timeout (selectable 8-30 hr)
- boost mode inhibit also selectable
1.63 V/cell (selectable from 1.60~1.90 V/cell
Auto Inverse EOD voltage x discharge current mode
(The end of discharge voltage increases at low discharge currents).
2.4 V/cell (selectable from 2.3-2.4V/cell)
Constant current and constant voltage (IU) charge mode
Programmable auto trigger or inhibit of boost mode
2.5
5
5
3.75
7.5
7.5
V/cell (VRLA)
Temperature Compensation
Ripple Voltage
Ripple Current
Boost Voltage
mV/°C/cl
% V float
% C10
VRLA
Boost Control
End Of Discharge
V/cell (VRLA)
Battery Charge
V/cell
Battery Charging Power*
max current (adjustable)
kW
A
* At low input voltage the UPS recharge capability increases with load decrease (up to the maximum capacity indicated)
Table 36
Inverter output to critical load
Rated Power, kVA (kW)
Unit of
Measurement
Steady state voltage stability
%
response 4
%
15 (12)
20 (16)
380/400/415 V
(three-phase, four-wire with neutral referenced
to the bypass neutral)
50 / 60
110% for 60 min
125% for 10 min
150% for 1 min
>150% for 200 msec
340% current limitation for 200 msec
100%
170%
±1 (balanced load),
±2 (100% unbalanced load),
±5
%
< 1 (linear load), < 4 (non linear load 3)
Rated AC Voltage 1
VAC
Frequency 2
Hz
Overload
% Rated
Fault Current
Non linear load capability 3
Neutral current capability
% Rated
% Rated
% Rated
Transient voltage
Total Harmonic Voltage
Distortion (THDV)
Synchronisation - Window
Slew Rate (Max change rate
of synch frequency)
1.
2.
3.
4.
Hz sec
10 (8)
Rated frequency +/- 1 Hz (selectable +/- 0.5 to
+/- 3Hz)
1 Hz/sec
selectable 0.1 to 3Hz/s (single UPS)
0.1 to 1.0Hz/sec (paralleled UPS)
Factory set to 400V – 380 or 415V selectable by commissioning engineer.
Factory set to 50Hz; 60 Hz selectable by commissioning engineer. Frequency converter operation also selectable.
EN 50091-3 (1.4.58) crest factor 3:1
IEC 62040-3 / EN 50091-3 also for 0-100-0% load transient. Transient recovery time: return to within 5% of steady state
output voltage within half a cycle.
69
Technical Specifications
Table 37
Bypass mains input
Rated power, kVA
Unit of
Measurement
Rated AC Voltage 1
VAC
10
15
20
380/400/415 V
three-phase four-wire, sharing neutral with the rectifier input
and providing neutral reference to the output
Rated Current
380V
400V
415V
Overload Capacity
Upstream Protection,
Bypass Line (by others)
Current Rating of Neutral Cable
Frequency 2
Transfer Time (between
bypass and inverter)
Bypass Voltage Tolerance
Bypass Frequency Tolerance
Synchronisation - Window
A
A
A
%
N/A
A
Hz
ms
% VAC
%
Hz
Slew Rate (max change rate
of synch frequency)
Hz/Sec
Inverter Voltage Tolerance
% VAC
15
15
14
23
30
22
29
21
28
135% long term
170% 10 min
1000% 100 ms
Thermomagnetic circuit breaker, rated up to 125%
of nominal output current. IEC 60947-2 curve C.
1.7 x In
50 / 60
Synchronous transfer: ≤ 0.5
Asynchronous transfer (default): 15 ms (50 Hz), 13.3 ms (60 Hz)
or 40, 60, 80, 100 ms, selectable
Upper limit: +10, +15 or +20, default +15
Lower limit –10, -20, -30 or -40, default: -20
(delay time to accept steady bypass voltage: 10 sec)
± 2.5 ± 5 ± 10 or ± 20 default ±10
Rated frequency ±1 Hz (selectable ± 0.5 to ±3Hz)
1 Hz/sec
selectable 0.1 to 3Hz/s (single UPS),
0.1 to 1.0Hz/sec (paralleled UPS)
±5
1. Factory set to 400V – 380 or 415V selectable by commissioning engineer.
2. Factory set to 50Hz; 60 Hz selectable by commissioning engineer. Bypass condition ignored when UPS set as frequency converter.
70
POWER AVAILABILITY
Liebert NX™
USER MANUAL
The Company Behind the Products
With over a million installations around the globe,
Liebert is the world leader in computer protection
systems. Since its founding in 1965, Liebert has
developed a complete range of support and
protection systems for sensitive electronics:
•
Environmental systems—close-control
conditioning from 1 to 60 tons
air
•
Power conditioning and UPS with power
ranges from 300 VA to more than 1000 kVA
•
Integrated systems that provide both
environmental and power protection in a
single, flexible package
•
Monitoring and control—from systems of any
size or location, on-site or remote
•
Service and support through more than 100
service centers around the world and a 24/7
Customer Response Center
While every precaution has been taken to ensure the
accuracy and completeness of this literature, Liebert
Corporation assumes no responsibility and disclaims all
liability for damages resulting from use of this information
or for any errors or omissions.
© 2005 Liebert Corporation
All rights reserved throughout the world. Specifications
subject to change without notice.
® Liebert and the Liebert logo are registered trademarks
of Liebert Corporation. All names referred to are
trademarks or registered trademarks of their respective
owners.
SL-25410 (9/05) Rev. 1
Technical Support/Service
Web Site
www.liebert.com
Monitoring
800-222-5877
monitoring@liebert.com
Outside the US: 614-841-6755
Single-Phase UPS
800-222-5877
upstech@liebert.com
Outside the US: 614-841-6755
Three-Phase UPS
800-543-2378
powertech@liebert.com
Environmental Systems
800-543-2778
Outside the United States
614-888-0246
Locations
United States
1050 Dearborn Drive
P.O. Box 29186
Columbus, OH 43229
Italy
Via Leonardo Da Vinci 8
Zona Industriale Tognana
35028 Piove Di Sacco (PD)
+39 049 9719 111
Fax: +39 049 5841 257
Asia
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108 Gloucester Road, Wanchai
Hong Kong
852 25722201
Fax: 852 28029250