Page 1
Liebert NX 30/40/60kVA
UNINTERRUPTIBLE POWER SUPPLY
USER MANUAL
10H52192UM60 - Rev. 1
Page 2
2 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX
All rights, including rights of translation, reproduction by
printing, copying or similar methods, even of parts, are
reserved.
Offenders will be liable for damages.
All rights, including rights created by patent grant or
registration of utility model or design, are reserved.
Delivery subject to availability. Right of technical modification
reserved.
Your Liebert NX model may differ from the one displayed on
the front cover.
Page 3
User Manual 10H52192UM60 - Rev. 1 - 09/2011 3
Contents Liebert NX
Contents
Chapter 1 Installing the UPS Module .................................................................................................................................. 7
1.1 Brief Introduction ................................................................................................................................................... 7
1.2 Unpacking ............................................................................................................................................................. 8
1.3 Initial Check .......................................................................................................................................................... 8
1.4 Location Selection ................................................................................................................................................. 9
1.4.1 UPS Room ................................................................................................................................................. 9
1.4.2 External Battery Room (Additional Conditions for UPS with Integrated Batteries) ..................................... 9
1.4.3 Storage ...................................................................................................................................................... 9
1.5 Positioning .......................................................................................................................................................... 10
1.5.1 System Cabinet ....................................................................................................................................... 10
1.5.2 Moving the Cabinet .................................................................................................................................. 10
1.5.3 Clearance ................................................................................................................................................ 10
1.5.4 Front Access ............................................................................................................................................ 10
1.5.5 Final Positioning and Fixing ..................................................................................................................... 11
1.5.6 Cable Entry .............................................................................................................................................. 11
1.6 External Protective Device .................................................................................................................................. 11
1.6.1 Rectifier and Bypass Input ....................................................................................................................... 12
1.6.2 External Battery Circuit Breaker .............................................................................................................. 12
1.6.3 UPS Output ............................................................................................................................................. 12
1.7 Power Cable ....................................................................................................................................................... 13
1.7.1 Maximum Steady State AC and DC Currents .......................................................................................... 13
1.7.2 Distance from Floor to Connection Point on the Equipment .................................................................... 13
1.7.3 Cable Connection .................................................................................................................................... 14
1.8 Control Cables and Communication ................................................................................................................... 17
1.8.1 Input Dry Contact Port ............................................................................................................................. 17
1.8.2 BCB Port .................................................................................................................................................. 18
1.8.3 Maintenance Switch and Output Switch State Port ................................................................................. 18
1.8.4 Output Dry Contact Port (Backfeed Protection) ....................................................................................... 19
1.8.5 Remote EPO Input Port ........................................................................................................................... 19
1.8.6 RS485 Port, RS232 Port, and IntelliSlot Port ........................................................................................... 20
1.8.7 NX IntelliSlot Communication .................................................................................................................. 20
1.8.8 IntelliSlot Web Card – SNMP/HTTP Network Interface Card (IS-WEBL) ................................................ 20
1.8.9 IntelliSlot 485 Interface Card (IS-485L) ................................................................................................... 20
1.8.10 IntelliSlot Relay Card (IS-485L) ............................................................................................................. 21
1.8.11 NX Communication Options .................................................................................................................. 21
Chapter 2 Battery .............................................................................................................................................................. 22
2.1 Brief Introduction ................................................................................................................................................. 22
2.2 Safety .................................................................................................................................................................. 22
2.3 Battery Power Cable (External Batteries Only) ................................................................................................... 23
Page 4
4 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Contents
2.3.1 Overview .................................................................................................................................................. 23
2.3.2 Installing the Batteries ............................................................................................................................. 23
2.3.3 Connecting the Batteries ......................................................................................................................... 23
2.4 Battery Maintenance ........................................................................................................................................... 25
2.5 Battery Recycling ................................................................................................................................................ 25
2.6 Reference Current and Connection of External BCB .......................................................................................... 26
Chapter 3 Installing Parallel Systems ................................................................................................................................ 28
3.1 Overview ............................................................................................................................................................. 28
3.2 1 + N Parallel System ......................................................................................................................................... 28
3.2.1 Installing the Cabinet ............................................................................................................................... 28
3.2.2 External Protective Device ....................................................................................................................... 29
3.2.3 Power Cable ............................................................................................................................................ 29
3.2.4 Auxiliary Control Wiring ........................................................................................................................... 30
3.2.5 Parallel Control Cables ............................................................................................................................ 30
3.3 Dual Bus System ................................................................................................................................................ 31
3.3.1 Installing the Cabinet ............................................................................................................................... 31
3.3.2 External Protective Device ....................................................................................................................... 31
3.3.3 Power Cable ............................................................................................................................................ 31
3.3.4 Control Cable ........................................................................................................................................... 31
Chapter 4 Operation .......................................................................................................................................................... 33
4.1 Brief Introduction ................................................................................................................................................. 33
4.1.1 Operating Theory ..................................................................................................................................... 33
4.1.2 Static Transfer Switch .............................................................................................................................. 34
4.2 1 + N Parallel System ......................................................................................................................................... 34
4.2.1 Parallel System Features ......................................................................................................................... 34
4.2.2 Requirements for Paralleling UPS Modules ............................................................................................. 34
4.3 Operating Mode .................................................................................................................................................. 34
4.3.1 Normal Mode ........................................................................................................................................... 35
4.3.2 Battery Mode ........................................................................................................................................... 35
4.3.3 Automatic Restart Mode .......................................................................................................................... 35
4.3.4 Bypass Mode ........................................................................................................................................... 35
4.3.5 Maintenance Mode (Manual Bypass) ...................................................................................................... 35
4.3.6 Parallel Redundancy Mode (System Expansion) ..................................................................................... 35
4.4 Battery Management (Set Up During Commissioning) ....................................................................................... 35
4.4.1 Normal Function ...................................................................................................................................... 35
4.4.2 Advanced Function .................................................................................................................................. 36
4.5 Battery Protection (Set Up by Commissioning Engineer) .................................................................................... 36
Chapter 5 Operator Control and Display Panel ................................................................................................................. 37
5.1 Introduction ......................................................................................................................................................... 37
5.1.1 Indicators ................................................................................................................................................. 37
Page 5
User Manual 10H52192UM60 - Rev. 1 - 09/2011 5
Contents Liebert NX
5.1.2 Audible Alarm (Buzzer) ............................................................................................................................ 38
5.1.3 Control Keys ............................................................................................................................................ 38
5.1.4 LCD and Menu Keys ............................................................................................................................... 38
5.2 LCD Screen Type ............................................................................................................................................... 39
5.2.1 Start Screen ............................................................................................................................................. 39
5.2.2 Primary Screen ........................................................................................................................................ 39
5.2.3 Default Screen ......................................................................................................................................... 40
5.3 Detailed Description of Menu Items .................................................................................................................... 40
5.4 Prompt Window ................................................................................................................................................... 42
5.5 Status/Alarm List ................................................................................................................................................. 42
Chapter 6 Operating Instructions ...................................................................................................................................... 46
6.1 Power Switches (Behind the Front Door) ............................................................................................................ 46
6.2 UPS Startup Procedures ..................................................................................................................................... 47
6.2.1 Procedure for Startup in Normal Mode .................................................................................................... 47
6.2.2 Procedure for Startup Without Input Supply ............................................................................................ 49
6.3 Procedures for Transfer Between Operating Modes ........................................................................................... 49
6.3.1 Transfer from Normal Mode to Battery Mode .......................................................................................... 49
6.3.2 Transfer from Normal Mode to Bypass Mode .......................................................................................... 49
6.3.3 Transfer from Bypass Mode to Normal Mode .......................................................................................... 50
6.3.4 Transfer from Normal Mode to Maintenance Mode ................................................................................. 50
6.3.5 Transfer from Maintenance Mode to Normal Mode ................................................................................. 50
6.4 Procedure for Completely Powering Down the UPS ........................................................................................... 51
6.5 Procedure for Completely Powering Down the UPS While Maintaining the Power Supply to the Load .............. 51
6.6 Isolation Procedure (for One UPS in a Parallel System) ..................................................................................... 51
6.7 Insertion Procedure (for One UPS in a Parallel System) .................................................................................... 52
6.8 EPO Procedure ................................................................................................................................................... 52
6.9 Automatic Restart ............................................................................................................................................... 52
6.10 UPS Reset Procedure ....................................................................................................................................... 53
6.11 Selecting the Display Language ........................................................................................................................ 53
6.12 Changing the Current Date and Time ............................................................................................................... 53
6.13 Control Password .............................................................................................................................................. 53
Chapter 7 Service ............................................................................................................................................................. 54
7.1 Service Procedures for Power Module and Bypass Module ............................................................................... 54
7.1.1 Notes ....................................................................................................................................................... 54
7.1.2 Service Procedure for Power Modules .................................................................................................... 54
7.1.3 Service Procedure for Bypass Module..................................................................................................... 54
7.2 Air Filter Replacement Procedure ....................................................................................................................... 55
Chapter 8 Product Specifications ...................................................................................................................................... 57
8.1 Conformity and Standards .................................................................................................................................. 57
8.2 Environmental Characteristics ............................................................................................................................ 57
Page 6
6 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Contents
8.3 Mechanical Characteristics ................................................................................................................................. 57
8.4 Electrical Characteristics (Input Rectifier) ........................................................................................................... 58
8.5 Electrical Characteristics (Intermediate DC Circuit) ............................................................................................ 58
8.6 Electrical Characteristics (Inverter Output) ......................................................................................................... 59
8.7 Electrical Characteristics (Bypass Input) ............................................................................................................. 59
8.8 Efficiency, Heat Losses and Air Exchange ......................................................................................................... 60
Chapter 9 Transformer Versions ....................................................................................................................................... 61
9.1 Input Transformer Version .................................................................................................................................. 61
9.2 Output Transformer Version ............................................................................................................................... 62
Appendix 1 Option List ....................................................................................................................................................... 63
Appendix 2 Abbreviations .................................................................................................................................................. 64
Page 7
User Manual 10H52192UM60 - Rev. 1 - 09/2011 7
Installing the UPS Module Liebert NX
Chapter 1 Installing the UPS Module
This chapter explains how to install the Liebert NX 30 - 60kVA UPS (hereinafter referred to as UPS) module, and includes
instructions about unpacking it, carrying out the initial checks, selecting the location, positioning it, and connecting it to external
protective devices and cables.
1.1 Brief Introduction
This paragraph provides a short summary of the factors that must be taken into account when selecting the location and
connecting the UPS and associated devices.
Because each site is different, this chapter does not provide detailed installation steps, and is only intended as a guide to the general
procedures and practices that the installation engineer should implement in order to handle the specific conditions present at the
site correctly.
Note: Handling
The equipment must be kept upright at all times and handled with care; it may be damaged if dropped or subjected to severe impact.
Warning: Professional installation required
1. The UPS complies with the requirements of EMC Directive 2004/ 108/ EC and the published technical standards.
Continued compliance requires installation in accordance with these instructions and use of approved accessories.
Installation restrictions or additional measures may be needed to prevent radio interference.
2. Do not apply electrical power to the UPS without the permission of the commissioning engineer.
3. The UPS should be installed by a qualified engineer in accordance with the information contained in this manual. All equipment not
covered by this manual is supplied with its own specific mechanical and electrical installation instructions.
Note: 3-phase 5-wire input power required
The standard UPS can be connected to 3-phase 5-wire (L1, L2, L3, N, PE) TN, TT, and IT AC distribution systems (IEC60364-3).
Warning: Battery hazards
1. Take special care when working with the batteries associated with the UPS. When the battery is connected, the battery terminal
voltage exceeds 400 Vdc and is potentially lethal.
2. Wear eye protection to prevent injury from accidental electrical arcs.
3. Remove rings, watches, and all metal objects.
4. Only use tools with insulated handles.
5. Wear rubber gloves.
6. 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.
7. If electrolyte comes into contact with the skin, the affected area should be washed immediately with water.
Page 8
8 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Installing the UPS Module
1.2 Unpacking
To avoid damaging the equipment, be extremely careful when removing the packaging. Check all packaging materials to ensure
that no items are discarded. Position the sloped pallet top cover in front of the pallet, as shown in Figure 1-1 and fix them together
using the hook, then roll the UPS gently down the resulting slope, as illustrated in Figure 1-1.
Figure 1-1 Unpacking
1.3 Initial Check
Check the following items before installing the UPS:
1. Inspect the UPS and battery externally and internally for signs of any damage that may have occurred during shipping. Report
any such damage to the shipper immediately.
2. Verify the UPS label and check that the UPS conforms to the data indicated on it. The UPS label is attached to the back of the door.
The UPS model, capacity, and main parameters are marked on the label.
Page 9
User Manual 10H52192UM60 - Rev. 1 - 09/2011 9
Installing the UPS Module Liebert NX
1.4 Location Selection
Note
The UPS and external battery cubicles should be installed on a concrete or other noncombustible surface.
Ensure that the floor is capable of supporting the weight of the UPS and associated devices.
1.4.1 UPS Room
The UPS is designed to be installed indoors. It should be installed in a clean environment with adequate ventilation in order to
ensure that the environmental parameters remain within the specified operating range (see Table 8-2). For example, the UPS
should not be installed in environments that do not conform to its design requirements, such as underpasses or outdoor locations
without air-conditioning.
The UPS uses forced cooling by internal fans. Cooling air enters the UPS through the ventilation grills at the front of the cabinet and
is expelled through the ventilation grills in the rear of the cabinet. Do not obstruct the ventilation holes.
We advise installing the UPS in an equipment room or power distribution room. If necessary, install an extractor fan system in order
to aid cooling-air flow and avoid overheating in the room. The UPS should be fitted with an air filter when it is operated in a dusty
environment.
1.4.2 External Battery Room (Additional Conditions for UPS with Integrated Batteries)
Batteries generate significant quantities of hydrogen and oxygen as they near the end of their re-charge cycle. Therefore the fresh
air volume of the battery installation environment must meet the EN50272-2001 requirements.
The ambient temperature of the battery must be stable. Ambient temperature is a major factor in determining battery capacity and
life. The nominal operating temperature of the battery is 20°C. Operating above this temperature will reduce the battery life,
whereas operating below it will reduce the battery capacity. If the average operating temperature of the battery rises from 20ºC to
30ºC, the service life of the battery will be reduced by 50%. If the operating temperature of the battery is above 40ºC, the battery
service life will decrease exponentially. In a normal installation, the battery temperature is maintained between 15°C and 25°C.
Keep batteries away from heat sources and ventilation holes.
If an external battery is used, a battery protection device (for example, fuse or circuit breaker) must be installed. The battery
protection device must be installed as close to the battery as possible, and the cabling distance between the battery protection
device and the battery must be kept to a minimum.
1.4.3 Storage
If the UPS is not installed immediately, it must be stored in a cool, dry place (see Table 8-2). The battery must also be stored in a
cool, dry place with good ventilation. Ideally, the equipment should be stored at a temperature between 20ºC and 25ºC. For UPS
modules with integrated batteries, the battery storage conditions shall apply.
Warning
During storage, charge the battery periodically in accordance with the battery manufacturer instructions. During the charging process,
temporarily connect the UPS to the mains and activate the battery for the time necessary to recharge the battery.
Page 10
10 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Installing the UPS Module
1.5 Positioning
To prolong the service life, the selected location must satisfy the following conditions:
flat ground
convenient wiring
space for easy operation on UPS
sufficient air exchange to dissipate heat produced by UPS
protection against atmospheric agents
protection against excessive humidity and heat sources
protection against dust
compliance with fire prevention requirements
operating ambient temperature between 20°C and 25°C (the temperature range for max. battery efficiency)
The UPS consists of a steel frame structure with removable panels. The top and side panels are secured by screws. The power
terminals are located on the rear of the unit, and are covered by a removable panel that is held in place by screws. The UPS is also
equipped with casters and brake pads. Opening the UPS door enables the operator to access the communication interfaces and
power switches. The UPS features an operator control and display panel located on its front door, which provides basic operating
status and alarm information. The UPS air inlet is located at the front and the outlet is at the back.
1.5.1 System Cabinet
Depending on the specific design requirements, a UPS system may include certain equipment cabinets, such as UPS cabinet,
external battery cabinet, external bypass cabinet, etc. The cabinets should be installed side by side for aesthetic effect.
1.5.2 Moving the Cabinet
Warning
1. Ensure that the lifting equipment used to move the UPS cabinet is capable of supporting its weight. For the UPS weight, refer to
Table 8-3.
2. Ensure that sufficient personnel and lifting gear are available when removing the shipping pallet.
Note
Take special care when moving the UPS and the battery cabinet when fitted with batteries, and keep moving distance to a minimum.
Before moving the UPS, ensure that the four brake pads at the bottom plate of the UPS are in the raised position.
The UPS is equipped with casters for ease of movement over short distances (e.g. to when transferring the UPS from the shipping
pallet and when moving the cable-connected UPS to its final position). For larger distances, use a forklift truck or similar device to
move the UPS.
1.5.3 Clearance
Leave sufficient space in front of the UPS so that the front door can be opened fully and personnel can move freely when operating
the power switches and connecting the interface cables located behind it. It is necessary to leave enough space behind the UPS (at
least 350 mm) to permit the air it expels to circulate freely. Since the power input and output cables are connected to the rear of
the UPS, make sure also that the clearance behind it is sufficient to prevent the cables from being crushed when the UPS is moved
to its final position. It is also possible to leave a little space either side of the unit so that it can be moved back and forth.
1.5.4 Front Access
The component layout of the UPS supports front access and top access for servicing, diagnosing, and repairing the UPS. To allow
access to the power terminals on the rear, the UPS is mounted on casters. This reduces the space requirement for side and rear
access.
Page 11
User Manual 10H52192UM60 - Rev. 1 - 09/2011 11
Installing the UPS Module Liebert NX
1.5.5 Final Positioning and Fixing
Figure 1-2 illustrates the UPS installation dimensions. Once the unit is in its final position, lower the brake pads, by unscrewing
them with a suitable wrench, until they rest on the ground. If the UPS is mounted on a raised floor, a suitable pedestal should be
designed, which should be able to support the weight of the UPS. When designing the pedestal, refer to the views below in Figure
1-2.
Figure 1-2 30 -60 kVA UPS Installation Dimensions (unit: mm)
1.5.6 Cable Entry
The UPS uses cable entry from below.
1.6 External Protective Device
The UPS is equipped with its own mains separation device. External circuit breakers must be fitted at the input AC supply of the UPS
at the installation site by the customer. They must be installed near the UPS and labeled as the mains separation devices for the
UPS.
Note: Warning label
The following label must be displayed on all switching devices installed in the same electrical system as the UPS, even when these
are located at a distance from the area in which it is located (according to European standard EN 62040-1)
WARNING! BEFORE WORKING ON THIS CIRCUIT: ISOLATE UNINTERRUPTIBLE POWER SYSTEM (UPS), THEN CHECK FOR
HAZARDOUS VOLTAGE BETWEEN ALL POWER TERMINALS INCLUDING THE PROTECTIVE GROUNDING TERMINAL. RISK OF
BACKFEED VOLTAGE.
This section provides a general guide for qualified installation engineers. The installation engineers should have knowledge of the
local wiring regulations for the equipment to be installed.
Page 12
12 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Installing the UPS Module
1.6.1 Rectifier and Bypass Input
Overcurrents
Common bypass: Install suitable protective devices on the incoming mains supply distribution system, taking into account the
power cable current-carrying capacity and overload capacity of the system (see Table 8-6). Under normal circumstances, we
recommend magnetic circuit breakers with IEC60947-2 tripping curve C (normal) at 125% of the current listed in Table 1-1.
Separate bypass: In the case of separate bypass supply, install separate protective devices on the bypass input lines in the incoming
mains distribution panel.
Note
1. The rectifier input and bypass input must use the same neutral line.
2. For IT power systems, four-pole protective devices must be used upstream of the input distribution panel and output distribution
panel, external to the UPS.
Earth Leakage
The residual earth current generated by the RFI suppression filter inside the UPS is greater than 3.5 mA and less than 1000
mA. It is recommended that the sensitivity of all differential devices be verified upstream of the input distribution panel.
Use of Differential Protective Devices (RCCBs or RCDs)
The UPS does not require RCCBs or RCDs to be connected upstream, however, when these are fitted in order to comply with local
regulations it must be remembered that separate RCCBs or RCDs in the rectifier and bypass supply lines may trip incorrectly,
interrupting the power supply to the unit. Therefore, if unavoidable, only one differential protection should be used for both
rectifier and bypass input.
An RCCB or RCD installed on the input bypass supply senses the sum of all earth leakage currents in both the UPS and the load it
supplies. To avoid incorrect operation, the following must be taken into consideration when selecting RCCBs or RCDs for
installation at input supply:
1. The nominal value of ID must take into account the earth leakage current of the UPS and the load, in normal operating
conditions: ID = ID
UPS + load leakage current.
(The maximum limit for UPS earth leakage current is 5% of the nominal input current. See EN62040-1)
2. It must be of a delayed operation type (greater than 300 mS).
3. The type of RCCB or RCD used must conform to product regulation EN62040-1.
In the case of systems distributed in parallel, a single, common RCCB or RCD is to be fitted upstream of the point at which the line
divides to supply the bypass inputs of the UPS. Installation of separate devices in other configurations can result in incorrect
operation.
In order to guarantee correct current distribution in the neutral cables, installation personnel are to ensure that the lengths of the
cables are as equal as possible. If, however, the bypass lines are drawn from sources that are galvanically isolated from each other,
an RCCB or RCD may be installed on each line. (In this case, and in cases when the load is supplied from the bypass via the bypass
static switch, the isolated sources are connected in parallel. It should be evaluated on an individual basis whether any resultant
imbalance between the currents on the bypass lines is compatible with the respective protective devices.)
1.6.2 External Battery Circuit Breaker
The UPS and its associated battery are protected against the effect of overcurrents by a fused switch, mounted on the external
battery cabinet. For internal batteries, the battery fused switch is integrated in the UPS.
The voltage of the battery overcurrent protection device is greater than 500 Vdc, and its DC breaking current is more than 8 kA.
1.6.3 UPS Output
The UPS output distribution must be fitted with a protective device. This device must be different to the input distribution
protection switch and must be able to provide overload protection (see Table 8-6).
Page 13
User Manual 10H52192UM60 - Rev. 1 - 09/2011 13
Installing the UPS Module Liebert NX
1.7 Power Cable
The cable design must comply with the instructions provided in this section, conform to local wiring practices, take the
environmental conditions into consideration, and comply with IEC60950-1.
1.7.1 Maximum Steady State AC and DC Currents
Table 1-1 Maximum Steady State AC and DC Currents
UPS rating (kVA)
Rated current (A) Busbar stud size
Input mains current
1，2
with full battery recharge
Output current
2
at full
load
Battery discharge
current at EOD
3
(32 blocks)
Main input, output,
bypass input cables
Battery cables
380V 400V 415V 380V 400V 415V Bolt
Tor q ue
(Nm)
Bolt
Tor q ue
(Nm)
60 112 106 102 90 86 82 200
M8 15 M8 15
40 75 71 68 60 57 55 133
30 56 53 51 45 43 41 100
Note:
1. Input mains current for common rectifier and bypass AC input.
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 1.7 times of the rated current.
3. The battery discharge current should change with the battery voltage.
1. Protective earth cable: Follow the most direct route possible when connecting the earth cable to the cabinet. The size of the
earth cable is to be determined according to the AC supply fault rating, cable lengths, and type of protection.
2. When sizing the battery cables, a maximum volt drop of 4 Vdc is permissible at the current ratings given in Table 1-1. The load
equipment is generally connected to a distribution board containing individually protected busbars rather than being connected
directly to the UPS output. The output cables from units in parallel to the parallel distribution bus should be the same type in order
to optimize current sharing. To minimize the electromagnetic interference, avoid forming coils.
3. See Figure 1-4 for the position of the terminals.
Warning
Failure to follow adequate earthing procedures may result in electromagnetic interference or in hazards such as electric shock or fire.
1.7.2 Distance from Floor to Connection Point on the Equipment
Table 1-2 Distance from Floor to Connection Point on the Equipment
UPS connection point
Minimum distance (mm)
30 kVA 40 kVA 60 kVA
Rectifier AC input supply 1000 1000 1000
Bypass AC input supply 1000 1000 1000
UPS AC output 1000 1000 1000
Battery power 1000 1000 1000
Auxiliary cable to monitoring board (U2) 1104 1104 1104
Page 14
14 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Installing the UPS Module
1.7.3 Cable Connection
Important
The operations described in this section must be performed by authorized personnel. If you have any questions, please contact the
local Emerson customer service center immediately.
Warning
1. Before connecting the cables, ensure that you are aware of the location and state of the breaker that connects the UPS input to the
mains distribution panel. Check that this breaker is off and display any warning signs necessary to prevent inadvertent operation of the
breaker.
2. Check that the battery fuses are not inserted and that the external battery switch is open.
3. The power cables should be routed through cable tunnels or metallic cable troughs to avoid being damaged by mechanical stress
and reduce electromagnetic interference in the area around them.
Once the equipment has been moved to its position and secured in place, refer to Figure 1-3 in order to connect the power cables as
described in the following procedures:
Figure 1-3 30/40/60 kVA UPS Electrical Connection
1. Make sure that the UPS equipment is isolated from its external power supply and all the UPS power isolators are open. Check that
these supplies are electrically isolated and display any warning signs necessary to prevent them being inadvertently operated.
2. In order to gain access to the external electrical connections, remove the rear panel of the UPS. Before the cables are connected
they are passed through the cable clamps to hold them in position and then secured.
Page 15
User Manual 10H52192UM60 - Rev. 1 - 09/2011 15
Installing the UPS Module Liebert NX
Figure 1-4 UPS Power Terminals
Note:
1. Main input: U1, V1, W1, N1
2. Bypass input: U2, V2, W2, N2
3. UPS output: U3, V3, W3, N3
4. Battery input: +, -, BATT N
5. Earth: PE
3. Connect the protective earth cable and all other earth cables required to the earth terminals (PE).
Note
The earth cables and neutral line connection must comply with local and national codes of practice.
4. Identify and connect power connections for the input cables according to one of the following two procedures, depending on
the type of installation.
Common Input Connections
1) For a common bypass and rectifier input configurations for 30kVA to 60kVA UPS, connect the AC input cables to the rectifier
input terminals (U1-V1-W1-PEN1) and to the bypass input terminals (U2-V2-W2-PEN2). See Table 1-1 for the torque. Ensure correct
phase rotation.
Separate Bypass Connections
2) For separate bypass configurations, connect the main input cables to the rectifier input terminals (U1-V1-W1-PEN1), and
connect the bypass input cables to the bypass input terminals (U2-V2-W2-PEN2). See Table 1-1 for the torque. Ensure correct phase
rotation.
Warning
For separate bypass operation, ensure that the linking busbars between the bypass input and main input are removed. The rectifier
input and bypass input must be referenced to the same neutral point.
Page 16
16 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Installing the UPS Module
System Output Connection
5. Connect the system output cables between the UPS output terminals (U3-V3-W3-N3) and the critical load. See Table 1-1 for the
torque. Ensure correct phase rotation.
Warning
If the load equipment will not be ready to accept power when the commissioning engineer arrives, ensure that the ends of the system
output cables are safely isolated.
Warning: Hazardous battery terminal voltage, 400 Vdc
1. Ensure correct polarity of battery string end connections to the UPS terminals, i.e. (+) to (+), (–) to (–) and (N) to (N) but do not make
these connections unless authorized by the commissioning engineer.
2. Ensure correct polarity of battery string end connections. Do not reconnect these links unless authorized by the commissioning
engineer.
6. For frequency converter applications, ensure the bypass links are removed.
7. Replace the protective cover.
Page 17
User Manual 10H52192UM60 - Rev. 1 - 09/2011 17
Installing the UPS Module Liebert NX
1.8 Control Cables and Communication
As shown in Figure 1-5, there are a number of dry contact ports (J5 to J10) and communication ports (RS485 port, RS232 port and
three IntelliSlot ports) on the bypass module front panel.
J8 J5
J10 J7
J6
J9
12
RS232 Intellislot 1RS485
Intellislot 2
Intellislot 3
Figure 1-5 Dry Contact Ports and Communication Ports
The UPS accepts external signals from voltage-free (dry) contacts connected to push-in input dry contact terminals. Subject to
prior software programming, the signals are accepted by the UPS when the relevant terminals and the +12 V terminals are shorted.
All control cables must be routed separately from the power cables and parallel cables, double-insulated and typically 0.5 mm2 to
1.5 mm2 CSA for maximum runs between 20 m and 30 m respectively.
1.8.1 Input Dry Contact Port
The input dry contact ports J7 and J8 provide ground fault contacts for the battery and surrounding area. The ports are shown in
Figure 1-6 and described in Table 1-3.
12V
BtG
ENV
J7
+1 2V
J8
GND
BAT_OUT
12V
BAT_IN
Figure 1-6 Input Dry Contact Ports J7 and J8
Table 1-3 Description of Input Dry Contact Ports J7 and J8
Position Name Description
J7.1 ENV*
Battery room environment detection
If closed to J7.4 activates the warning message: “Battery Room Alarm”
J7.2 BtG
Battery ground fault
If closed to J7.4 activates the fault message: “Battery Ground Fault”
J7.3 - Free
J7.4 +12V +12V power
J8.1 BAT_IN Internal battery temperature detection
J8.2 +12V +12V power
J8.3 BAT_OUT External battery temperature detection
J8.4 GND Power ground
Note*: Activating this feature turns off the battery charger.
Page 18
18 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Installing the UPS Module
1.8.2 BCB Port
J6 is the BCB port. The port is shown in Figure 1-7 and described in Table 1-4.
12V
OL
GND
FB
DRV
J6
12V
12V
Figure 1-7 BCB Port
Table 1-4 BCB Port Description
Position Name Description
J6.1 DRV BCB driver signal (only for use with BCB control board)
J6.2 FB
BCB contact state. Connection J6.2 to J6.3.
If the internal BCB is in the open position, the BCB auxiliary contact is open.
The requirement for the external BCB auxiliary is as follows:
If the external BCB is in the open position, the external BCB auxiliary contact must be open.
This contact is only active if J6.3 and J6.4 are closed.
J6.3 GND Power ground
J6.4 OL
BCB on line
If the “BCB Contact State” is used, J6.3 and J6.4 must be closed.
(The same applies to use with BCB control board)
The connection between the BCB port and BCB is shown in Figure 1-8.
电池开关
BCB
J10
OL
GND
FB
DRV
Aux-N.O.
Aux-N.O.
J6
Aux_N.O.
Aux_N.O.
BCB
Figure 1-8 Connection Between BCB Port and BCB
1.8.3 Maintenance Switch and Output Switch State Port
J9 is the maintenance switch and output switch state port. The port is shown in Figure 1-9 and described in Table 1-5.
EXT-S
CAB-S
CAB-S
J9
EXT_Q3
IN_S
GND
EXT_OUT
Figure 1-9 Maintenance Switch and Output Switch State Port
Page 19
User Manual 10H52192UM60 - Rev. 1 - 09/2011 19
Installing the UPS Module Liebert NX
Table 1-5 Description of Maintenance Switch and Output Switch State Port
Position Name Description
J9.1 EXT_Q3
External maintenance switch state. Connection J9.1 to J9.4.
The requirement for the external breaker auxiliary is as follows:
If the external maintenance switch is in the open position, the external bypass auxiliary contact must
be closed. If this function is not in use, J9.1 and J9.4 must be closed.
J9.2 IN_S
Internal maintenance switch state. Connection J9.2 to J9.4.
If the internal maintenance switch is in the open position, the bypass auxiliary contact is open.
J9.3 EXT_OUT
Internal output switch state. Connection J9.3 to J9.4.
If the internal output switch is in the open position, the output auxiliary contact is open.
J9.4 GND Power ground
1.8.4 Output Dry Contact Port (Backfeed Protection)
J5 is the output dry contact port. It provides two relay output dry contact signals. The port is shown in Figure 1-10 and described in
Table 1-6. The shunt trip coil of the external air breaker can be driven directly via this dry contact. The shunt trip coil of the external
air breaker should be 250 Vac / 5 A or 24 Vdc / 5A.
J5
BFP_C
BFP_S
BFP_O
Figure 1-10 Output Dr y Contact Port
Table 1-6 Description of Output Dry Contact Port
Position Name Description
J5.1 - Free
J5.2 BFP_O Bypass backfeed protection relay (normally open), closed to J5.3 if bypass SCR is shorted
J5.3 BFP_S Bypass backfeed protection relay center
J5.4 BFP_C Bypass backfeed protection relay (normally closed), open to J5.3 if bypass SCR is shorted
1.8.5 Remote EPO Input Port
The UPS has an EPO function that operates by a button on the operator control and display panel of the UPS or by a remote contact
provided by the user. The EPO switch is under a hinged, plastic shield.
J10 is the remote EPO input port. The port is shown in Figure 1-11 and described in Table 1-7.
J10
+12V
EPO_NO
+12V
+12V
EPO_NC
Figure 1-11 Remote EPO Input Port
Page 20
20 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Installing the UPS Module
Table 1-7 Description of Remote EPO Input Port
Position Name Description
J10.1 EPO_NC EPO activated if opened to J10.2
J10.2 +12V EPO activated if opened to J10.1
J10.3 +12V EPO activated if shorted to J10.4
J10.4 EPO_NO EPO activated if shorted to J10.3
EPO is triggered when pins 3 and 4 of J10 are shorted or pins 2 and 1 of J10 are opened.
If an external EPO facility is required, pins 1 and 2 or 3 and 4 of J10 are reserved for this function. The external EPO facility is also
connected to the normally open or normally closed remote stop switch between these two terminals using a shielded cable. If this
function is not used, pins 3 and 4 of J10 must be opened and pins 1 and 2 of J10 must be shorted.
Note
1. When activated, the UPS EPO shuts down the rectifiers, inverters and static bypass, but does not disconnect the input power supply
internally. To disconnect all power to the UPS, open the upstream input breakers and the battery circuit breaker when the EPO is
activated.
2. Pins 1 and 2 of J10 are supplied factory-shorted.
1.8.6 RS485 Port, RS232 Port, and IntelliSlot Port
The RS485 and RS232 ports provide serial data and are intended for use by authorized commissioning and service personnel during
UPS commissioning and service activities.
IntelliSlot ports 1 to 3 support the following communication cards:
1. IS-WEBL, IS-485L, IS-485EXI, IS-RELAY
These cards communicate with the UPS via the Liebert Velocity protocol and with the external network using the industry standard
protocol.
Note
1. IntelliSlot port 1 shares communication resources with the RS232 port for service programming and, to avoid conflict, should
preferably be used for cards other than the dry contact card.
2. For card installation and setting procedures, refer to the user manuals for the cards.
1.8.7 NX IntelliSlot Communication
The NX has three Liebert IntelliSlot ports that allow field-installation of optional communication cards. Liebert IntelliSlot cards
communicate via the proprietary Velocity protocol with cards that translate the information into protocols such as SNMP and
Modbus. Make sure Velocity protocol is selected in the Protocol Settings menu of the LCD control panel.
Other cards provide dry contact signals for external operating status signals.
The NX IntelliSlot communication ports may be installed or removed while the NX is operating.
1.8.8 IntelliSlot Web Card – SNMP/HTTP Network Interface Card (IS-WEBL)
This network interface card provides all real-time data and status information as SNMP traps for connection to a 10/100-baseT
Ethernet connection. This card will also transmit the same status information and all measured parameters for display via a web
browser.
1.8.9 IntelliSlot 485 Interface Card (IS-485L)
The IntelliSlot 485 card provides Building Management System monitoring and control of your UPS. The card delivers the Modbus
protocol via its RS-485 port. This makes it possible to integrate the UPS into existing Building Management Systems that support
the open protocol standard of RTU Modbus.
Page 21
User Manual 10H52192UM60 - Rev. 1 - 09/2011 21
Installing the UPS Module Liebert NX
1.8.10 IntelliSlot Relay Card (IS-485L)
The Liebert IntelliSlot relay card provides contact closure for remote monitoring of alarm conditions in your UPS. The card is easy to
install and can be integrated with other relay contact monitoring systems.
The Liebert IntelliSlot relay card is 24VAC/VDC at 1A.
1.8.11 NX Communication Options
Port Type and Location Labeled ID Name of Port
Monitoring Devices
Supported
Left IntelliSlot IntelliSlot 1
IS-WEBL
IS-485L
IS-RELAY
Center IntelliSlot IntelliSlot 2
IS-WEBL
IS-485L
IS-RELAY
Right IntelliSlot IntelliSlot 3
IS-WEBL
IS-485L
IS-RELAY
Page 22
22 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Battery
Chapter 2 Battery
This chapter provides relevant information about the battery, including a short introduction, and information on battery safety,
battery power cables, battery maintenance and recycling, and the reference current.
2.1 Brief Introduction
The UPS battery string consists of batteries connected in series in order to supply the rated DC input voltage for the UPS inverter.
The battery backup time (that is, the time that the battery can continue to supply the load for when the mains supply is interrupted)
depends on the ampere-hour capacity of the batteries. Therefore, it may be necessary to connect several battery strings in parallel.
The NX UPS includes a battery compartment that can accommodate the internal batteries.
In the case of UPS configurations without internal batteries, the unit must be connected to an external battery cabinet. The external
battery is fitted with a protective device that can be used to isolate the battery in the event of maintenance work. This device is
mounted inside or in close proximity to the battery cabinet.
Note
1. The external battery cabinet for the UPS can hold up to 64 12 V batteries.
2. It must be possible to disconnect the battery from the UPS when carrying out maintenance or service work. The fuse holder can be
switched on or off manually.
3. The requirements of the EC directives are satisfied when battery cabinets are used with original accessories. If alternative batteries
are used, you must ensure that the applicable EC directives are met, and declare conformity.
2.2 Safety
Take special care when working with the batteries associated with the UPS. When all the blocks are connected together, the battery
string voltage can be up to 576 Vdc. This is potentially lethal. Please follow the precautions for high voltage operation. Only
qualified personnel are allowed to install and maintain the battery. To ensure safety, the external batteries are to be installed inside
a lockable cabinet or in a purpose-designed, dedicated battery room, so that they are only accessible to qualified maintenance
personnel.
During battery maintenance, pay attention to the following items:
Ensure that the UPS is in maintenance mode.
The battery cell number setting in the background software must be consistent with the actual battery cell number.
If the battery fuses are blown, the UPS must be repaired by authorized service personnel. The fuses must be replaced
using the same type as those that were delivered with the UPS and must be supplied by the same manufacturer.
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 localized conditions.
Warning: Hazardous battery voltage present behind covers
1. No user-serviceable parts are located behind covers that require a tool for their removal. Only qualified service personnel are
authorized to remove such covers.
2. Before working on the copper bars connected to the external battery, please ensure they are disconnected from all power supplies.
3. Observe the following safety precautions when working on the batteries:
1) The battery must be firmly and reliably connected. After the connection is completed, all connections between the terminals and
the batteries must be calibrated. The requirements for torque specified in the instructions or user manual provided by the battery
manufacturer must be satisfied. All connections between the terminals and the batteries must be inspected and tightened at least
once a year. Failure to observe this may result in fire!
2) Inspect the battery appearance before accepting and using the battery. If there is any damage to the packaging, dirty battery
terminals, terminal erosion, rust, or cracks in the enclosures, deformation or electrolyte leakage, replace it with a new product. Failure
to do so may result in battery capacity reduction, electrolyte leakage, or fire.
3) Batteries are very heavy. Please use the proper method when moving and lifting batteries to prevent any injuries or damage to the
battery terminals. Severely damaged batteries may catch fire.
4) The battery terminals must not be subject to any force, such as the pulling force or twisting force exerted by cables. This may
damage the internal connection of the battery and severe damage may result in fires.
Page 23
User Manual 10H52192UM60 - Rev. 1 - 09/2011 23
Battery Liebert NX
Warning: Hazardous battery voltage present behind covers
5) The battery must be installed and stored in a clean, cool, and dry environment. Do not install the battery in a sealed battery chamber
or a sealed room. The battery room ventilation must comply with EN50272-2001 as a minimum requirement. Failure to follow this
instruction may result in battery bulging, fire, or even injuries.
6) The battery must be kept away from heat sources such as transformers or fire sources. Do not burn the battery or the set battery on
fire, as this may result in electrolyte leakage, battery bulge, fire, or explosion.
7) Do not connect any conductor directly between the positive and negative terminals of the batteries. Remove rings, watches,
necklaces, bracelets, and other metal objects before working on the batteries and ensure that the tools (for example, wrenches) are
wrapped with insulating material. Failure to do so may result in battery burning, explosion, human death or injury.
8) Do not dismantle, modify, or damage the battery. This may result in a battery short circuit, electrolyte leakage, or even injury.
9) Clean the battery enclosure with a damp cloth. To avoid any static or arcing, do not use dry cloths or dusters to clean the battery. Do
not use organic solvent, such as thinner, gasoline, or
volatile oil
, as this may crack the battery enclosure. In the worst case scenario, this
may result in a fire.
10) The battery contains diluted sulfuric acid. In normal use, the diluted sulfuric acid is absorbed by battery the baffle and pole plates.
However, if the battery is damaged, the acid may leak from the battery. Therefore, use personal protective equipment such as goggles,
rubber gloves, and an apron when operating the battery. The diluted sulfuric acid may cause blindness if it enters the eyes and burns if
it comes into contact with the skin.
11) The battery be affected by shorting, electrolyte dry-up, or positive-pole plate erosion at the end of its life. If it is still used in this
state, thermal runaway, bulging, or electrolyte leakage may occur. Please replace the battery before it reaches this state.
12) Before connecting or disconnecting the battery connection cables, please cut off the charging power.
13) Check if the battery has been unexpectedly earthed. If this is the case, remove the earth connection. Contact with any part of the
earthed battery may result in an electric shock.
2.3 Battery Power Cable (External Batteries Only)
2.3.1 Overview
Please install and connect the batteries according to the following description and graphic representation.
2.3.2 Installing the Batteries
1. Before installation, check the batteries for signs of damage, inspect and count the accessories, and carefully read this manual and
the user manual or installation instructions provided by the battery manufacturer.
2. There must be a clearance of 10 mm between the vertical sides of the batteries to allow for the smooth flow of air around the
batteries.
3. A certain amount of clearance must be maintained between the battery top and the underside of the layer above it to facilitate
battery monitoring and maintenance.
4. The batteries must be installed from the bottom layer upwards to avoid creating a high center of gravity. The battery must be
installed properly and protected from vibrations or shock.
5. In the case of a parallel UPS system that uses a common battery bank, an additional isolating device (switch) must be installed in
the dedicated common battery connection to each individual UPS, so that system maintenance can be carried out correctly. In any
event, we advise against using common battery solutions as they reduce the reliability of the system.
6. Measure the battery voltage and calibrate the battery voltage after starting up the UPS.
2.3.3 Connecting the Batteries
1. Check that the battery fuses are not inserted. These must be fitted during commissioning, NOT during installation.
2. If the battery cabinet is installed on a raised floor, the battery power cables and other cables can enter the UPS cabinet through
the base of the cabinet. If the UPS and battery cabinet are installed side by side on a solid floor, these cables can be fed into the UPS
cabinet via the cable entry holes in the lower part of the battery cabinet. The cables for connecting the UPS to the battery cabinets
are not included in the delivery. They can be provided by the manufacturer upon request. For the best interference suppression (to
reach class C2 EM) we recommend using shielded battery cables between the UPS cabinet and the battery cabinet. The shielding
must be connected to both the UPS and the battery cabinets.
3. Make the ground connections (PE).
4. When multiple battery strings are used, they must be connected in series and then in parallel. Before applying load and
commencing power-up, be sure to measure the total voltage of the battery strings and make sure that it is correct. The negative
and positive terminals of the battery must be connected to the corresponding negative and positive battery terminals of the UPS, in
Page 24
24 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Battery
accordance with the labels on the battery and the UPS. Reverse battery connection may result in explosion, fire, damage to the
battery, damage to the UPS, or personal injury.
5. After connecting the battery cables, install an insulating shroud for each terminal.
6. The bending radius of the cable is to be larger than 10D, where D is the outer diameter of the cable.
7. After connecting the cables, do not pull on the battery cables or the cable terminals.
8. Do not cross the battery cables during connection and do not tie the battery cables together.
9. Connect the temperature sensor cable to terminal J8 of the UPS. Shielded temperature sensor lines must be used between the
UPS cabinet and the battery cabinet. The shielding should be connected to the UPS. Secure the sensor in the battery cabinet using
a cable clamp or similar device.
10. See Figure 2-1 and Figure 2-2 for the battery cable connection.
11. For NX UPS, it is necessary to install a separator between the two rows of batteries on each layer of the battery compartment, as
shown in Figure 2-2. The separators have been placed in the battery compartment in the factory before delivery.
Figure 2-1 External Battery Cable Connection
Page 25
User Manual 10H52192UM60 - Rev. 1 - 09/2011 25
Battery Liebert NX
Figure 2-2 Internal Battery Cable Connection (NXr 30-B)
2.4 Battery Maintenance
For battery maintenance and maintenance precautions, refer to IEEE-Std-1188-2005 and the relevant manuals provided by the
battery manufacturer.
Note
1. Periodically check the screws of the battery terminals for loose connection. If there are any loose screws, tighten them immediately.
2. Check that all safety devices are present and that they function correctly. Check that the battery management parameters are set
correctly.
3. Measure and record the air temperature inside the battery room.
4. Check the battery terminals for damage and heating and ensure that there is no evidence of corrosion. Check the battery enclosure
and terminal covers for damage.
2.5 Battery Recycling
If the battery leaks electrolyte, or is otherwise physically damaged, it should be placed in a container resistant to sulphuric acid and
disposed of in accordance with local regulations.
Disused lead-acid storage batteries are classified as dangerous waste and are critical elements in disused battery pollution control.
Storage, transportation, use, and disposal of batteries must comply with the national and local laws and regulations on dangerous
waste, disused battery pollution prevention, and other standards.
In accordance with the relevant national regulations, disused lead-acid storage batteries must be recycled and must not be
disposed of by other methods. Illegal dumping or any other improper disposal of disused lead-acid storage batteries may cause
severe environmental pollution and those responsible may be liable for prosecution.
As a lead-acid storage battery supplier, Emerson has created an excellent service network and disused battery recycling system to
help customers dispose of lead-acid storage batteries legally and properly. For detailed information about Emerson's disused
battery recycling system, please consult the local customer service center or Emerson sales office. If the customer disregards these
instructions or does not use Emerson's disused battery recycling system, Emerson cannot be held responsible for any
environmental consequences of the failure to dispose of disused battery products correctly.
Page 26
26 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Battery
2.6 Reference Current and Connection of External Battery Cubicle
Table 2-1 provides recommendations for the rated current and CSA connection cable.
Table 2-1 Reference Table for Selection of Rated Current and CSA Connection Cables (Recommended)
Item Unit
UPS rating (kVA)
30 40 60
30-block
battery
Maximum battery discharge
current at full load
A 105 140 210
Reference rated current A 150 175 250
CSA connection cable mm2 35 50 70
32-block
battery
Maximum battery discharge
current at full load
A 100 133 200
Reference rated current A 150 150 250
CSA connection cable mm2 35 50 70
34-block
battery
Maximum battery discharge
current at full load
A 94 125 186
Reference rated current A 100 150 200
CSA connection cable mm2 35 50 70
36-block
battery
Maximum battery discharge
current at full load
A 88 118 176
Reference rated current A 100 125 200
CSA connection cable mm2 25 35 50
38-block
battery
Maximum battery discharge
current at full load
A 84 112 168
Reference rated current A 100 125 200
CSA connection cable mm2 25 35 50
40-block
battery
Maximum battery discharge
current at full load
A 80 106 160
Reference rated current A 100 125 200
CSA connection cable mm2 16 25 35
N
N
N
UPS
+
N
N
-
UPS
N
+
-
Figure 2-3 Connections Between Battery, BCB, and UPS (4 Wires at Battery Side)
UPS
N
N
N
N
UPS
Figure 2-4 Connections Between Battery, BCB, and UPS (3 Wires at Battery Side, Battery Consisting of 30 to 34 Cells)
Page 27
User Manual 10H52192UM60 - Rev. 1 - 09/2011 27
Battery Liebert NX
N
N
UPS
+
N
-
UPS
N
+
-
Figure 2-5 Connections Between Battery, BCB, and UPS (3 Wires at Battery Side, Battery Consisting of 36 to 40 Cells)
Figure 2-6 INSERIRE DISEGNO INTERCONNESSIONE ARM. BATT + UPS
Page 28
28 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Installing Parallel Systems
Chapter 3 Installing Parallel Systems
This chapter describes how to install and connect a parallel system.
3.1 Overview
Up to four UPS units can be connected in parallel to form a parallel system. Parallel systems must be installed in accordance with
the UPS module installation procedures and the requirements outlined in this chapter.
In addition to the EPO switch provided on the operator control and display panel of each UPS module for controlling the EPO of
each module respectively, the parallel system also provides a remote EPO function so that all the UPS modules can be shut down
simultaneously from a remote terminal, as shown in Figure 3-1.
Note
1. The remote EPO switch must provide a dry contact signal, which is normally open or closed.
2. The open circuit voltage provided is 5 Vdc, < 20 mA.
3. The external EPO device may consist of another control system that can disconnect the UPS mains supply or the bypass input.
4. A jumper is connected between pins 1 and 2 of the normally closed EPO-J10 port on the bypass module in the factory.
UPS 1
J10: 3
J10: 4
J10: 3
J10: 4
UPS 2
UPS 1
Bypass module
Bypass module
J10: 3
J10: 4
Bypass module
Figure 3-1 EPO Circuit Diagram
3.2 1 + N Parallel System
The basic installation steps for a parallel system are the same as for the UPS module. The following sections describe the differences
between the procedure for installing the parallel system and the procedure for installing the UPS module.
3.2.1 Installing the Cabinet
Position the UPS modules and connect them as shown in Figure 3-2. The output distribution, consisting of the external UPS output
switches and maintenance bypass, must be installed as shown in Figure 3-2, in order to facilitate maintenance and system testing.
Page 29
User Manual 10H52192UM60 - Rev. 1 - 09/2011 29
Installing Parallel Systems Liebert NX
Qout of allUPS
Rectifier
L1, L2, L3, N
UPS 1 output
Qout UPS1
Supplied by others
Qin
UPS1
Mains input
Qout UPS2
Qin
UPS2
Qout UPS3
Qin
UPS3
Qin Ext
Byp
Qout BYP
L1, L2, L3, N
L1, L2, L3,
N
L1, L2, L3, N
L1, L2, L3,
N
L1, L2, L3
L1, L2, L3, N
L1, L2, L3, N
L1, L2, L3, N
Mains input
Bypass input
Bypass input
Mains input
Bypass
input L1,
L2, L3,N
STS
Inverter
Rectifier
STS
Inverter
Rectifier
STS
Inverter
UPS 2 output UPS 3 output
Output distribution
Figure 3-2 1 + N UPS System with External Maintenance Switch
Note
For 1+N installations, an external bypass rated for the total system load must be installed and the UPS internal maintenance bypass
must be locked to prevent it from being operated.
For parallel systems with 3 or 4 UPS with redundancy, and parallel systems with 2 or more UPS without redundancy, you should
install bypass load sharing inductors to optimize current sharing during static bypass operation.
3.2.2 External Protective Device
Refer to Chapter 1 Installing the UPS Module.
3.2.3 Power Cable
The wiring of the power cable is similar to that of the UPS module. The bypass and main input supplies must use the same neutral
line input terminal. If the input has a current leakage protection device, it must be fitted upstream of the common neutral sinking
point. Refer to Chapter 1 Installing the UPS Module.
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 in bypass mode.
Page 30
30 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Installing Parallel Systems
3.2.4 Auxiliary Control Wiring
Auxiliary wiring must be installed as shown in Figure 3-3 to protect the system and enable a single UPS to be isolated and tested
during service. Refer to 1.8.3 Maintenance Switch and Output Switch State Port for auxiliary contact details.
Input distribution
UPS 3
J9
143
UPS 2
J9
143
UPS 1
J9
143
Q1Ex t
Q2Ex t
QByp
QUPS
Q2Ex t
Distribution panel
To load
Figure 3-3 Auxiliary Control Wiring
3.2.5 Parallel Control Cables
Shielded and double-insulated parallel control cables available in lengths of 5 m, 10 m and 15 m must be interconnected in a ring
configuration between the UPS modules, as shown in Figure 3-4. The parallel ports J2 and J3 are provided on the front panel of the
bypass module, as shown in Figure 3-5. The ring connection ensures the reliability of the control of the parallel system. Be sure that
the cables are connected correctly before starting up the system!
J2
J3
UPS 1
J2
J3
UPS 2
J2
J3
UPS 3
J2
J3
UPS 4
Figure 3-4 Connection of Parallel Control Cables of 1+N Parallel System
J2
J3
J4
Figure 3-5 Locations of Ports J2, J3 and J4 on Bypass Module
Page 31
User Manual 10H52192UM60 - Rev. 1 - 09/2011 31
Installing Parallel Systems Liebert NX
3.3 Dual Bus System
3.3.1 Installing the Cabinet
A dual bus system consists of two independent UPS systems, each containing one or more parallel UPS modules (maximum 4), as
shown in Figure 3-6. The dual bus system has high reliability and is suitable for loads with multiple input terminals. For single-input
loads, an optional STS can be fitted to start the LBS supplied in standard configuration.
UPS 1
Bypass
UPS 1
LBS
To load
Main input
UPS4 UPS4
Main input Main inputMain input
Parallel
control
cable
Parallel
control
cable
Bypass
STS
Figure 3-6 Typical Dual Bus System (with STS and LBS)
The dual bus system uses the LBS to keep the output of the 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 of the parallel system comprise
master and/or slave operation in normal or bypass mode.
Place the UPS modules side by side and connect the UPS modules together as described below.
3.3.2 External Protective Device
Refer to Chapter 1 Installing the UPS Module.
3.3.3 Power Cable
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 Chapter 1 Installing the UPS Module.
3.3.4 Control Cable
For NX-to-NX dual bus systems, connect the optional LBS cables between the two UPS systems as shown in Figure 3-7 to Figure 3-9.
The J3 and J4 ports are provided on the front panel of the bypass module, as shown in Figure 3-5.
Page 32
32 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Installing Parallel Systems
UPS 1
Bypass module
LBS cable
UPS 3 UPS 4
J2
J3
J4
J2
J3
J4
J2
J3
J4
J2
J3
J4
Bypass module Bypass module Bypass module
UPS 2
LBS cable
Figure 3-7 Connection of Typical Dual Bus System of Two Parallel Systems
UPS 1
Bypass module
LBS cable
J2
J3
J4
J2
J3
J4
Bypass module
UPS 2
Figure 3-8 Connection of Typical Dual Bus System of Two Single UPS Modules Without Redundancy LBS Cable
UPS 1
Bypass module
L
B
S
c
a
b
l
e
J2
J3
J4
J2
J3
J4
Bypass module
UPS 2
L
B
S
c
a
b
l
e
Figure 3-9 Connection of Typical Dual Bus System of Two Single UPS Modules with Redundancy LBS Cable
Page 33
User Manual 10H52192UM60 - Rev. 1 - 09/2011 33
Operation Liebert NX
Chapter 4 Operation
This chapter describes how to operate the UPS, and includes a short introduction and sections on the 1+N parallel system,
operating mode, battery management, and battery protection.
Warning: Hazardous mains and 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
authorized to remove such covers.
4.1 Brief Introduction
The UPS provides continuous, high-quality AC power to your critical equipment, such as telecommunications and data processing
equipment. The UPS supplies power that is free of the disturbances and variations in voltage and frequency that are common in
mains power, which is subject to brownouts, blackouts, surges and sags.
The UPS uses the latest high-frequency, double-conversion PWM technology and DSP technology to enhance its reliability and
increase the ease of use.
4.1.1 Operating Theory
As shown in Figure 4-1, the AC mains supply is converted by the rectifier into DC power. The inverter converts that DC power from
the rectifier or the DC power from the battery into AC power, and provides the AC power to the load. The battery supplies the load
through the inverter in the event of a mains failure. The mains source can also supply the load through the static bypass.
If UPS maintenance or repair is necessary, the load can be transferred without power interruption to the maintenance bypass.
Figure 4-1 Operating Theory for UPS Module System (30/40/60 kVA)
STS
Page 34
34 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Operation
4.1.2 Static Transfer Switch
The circuit block labeled STS in Figure 4-1 contains an electronically controlled switching circuit that enables the load to be
connected to either the inverter output or to the 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 fault, the load is automatically transferred to the
static bypass line.
During normal operating conditions, the inverter output and bypass supply must be fully synchronized in order to guarantee clean
(no-break) load transfer between the inverter output and static bypass line. The synchronization between the inverter output and
static bypass 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 maintenance bypass supply while the UPS is shut down for routine maintenance and repair.
Note
When the UPS is operating in bypass mode or in maintenance bypass, the equipment connected to it is not protected from power
failures, surges, or sags.
4.2 1 + N Parallel System
Up to four UPS modules can be connected in parallel to form a 1 + N system in order to increase the system capacity, reliability, or
both. The load is shared equally between the parallel UPS.
4.2.1 Parallel System Features
1. The parallel system hardware and software are identical to the single UPS module. The parallel configuration is achieved by using
settings in the configuration software. The parameter settings of each UPS module in the parallel system should be the same.
2. Parallel control cables are connected in a ring, providing both system reliability and redundancy. Dual bus control cables are
connected between any two UPS modules of each bus. The intelligent parallel 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 synchronized and self-recoverable, for example, after clearing any overloads that may occur.
3. The total load of the parallel system can be queried from the LCD for each UPS module.
4.2.2 Requirements for Paralleling UPS Modules
A group of paralleled modules behaves as if it were one large UPS, with the advantage of increased reliability. To ensure that all
modules are utilized equally 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 main input sources must be referenced to the same neutral potential.
3. Any RCD that is installed must be configured appropriately and located upstream of the common neutral bonding point.
Alternatively, the device must monitor the protective earth current of the system. Refer to Safety Manual.
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.
4.3 Operating Mode
The UPS is an on-line, double-conversion, reverse-transfer UPS that features the following operating modes:
Normal mode
Battery mode
Automatic restart mode
Bypass mode
Maintenance mode (manual bypass)
Parallel redundancy mode
Page 35
User Manual 10H52192UM60 - Rev. 1 - 09/2011 35
Operation Liebert NX
4.3.1 Normal Mode
The UPS rectifier derives power from the AC mains input source and supplies DC power to the inverter, which continuously supplies
the AC load to the load. Simultaneously, the charger, which derives power from the rectifier, float, or boost, charges the associated
backup battery of the UPS.
4.3.2 Battery Mode
The UPS operates in battery mode when the battery supplies backup power to the load through the inverter. In the event of a mains
failure, the UPS automatically transfers to battery mode without interrupting the power supply to the load. When AC mains supply
is restored, the UPS automatically returns to normal mode without the need for intervention on the part of the user, and without
interrupting the power supply to the load.
Note
Battery start function is available for switching the UPS to battery (charged) mode directly in the event of mains failure. Thus, the
battery power can be used independently to increase the UPS utility.
4.3.3 Automatic Restart Mode
The battery will become discharged following an extended AC mains failure. The inverters shut down when the battery reaches the
EOD voltage. The UPS can be programmed for automatic restart following EOD after a given variable delay time. This mode and any
delay times must be programmed by the commissioning engineer.
4.3.4 Bypass Mode
During normal operating mode, if the inverter fails, is overloaded or turned off, the static transfer switch will transfer the load from
the inverter to the bypass source without interrupting the power supply to the load. If the inverter is not synchronized with the
bypass, the static transfer switch will transfer the load from the inverter to the bypass interrupting the power supply to the load.
This is done to avoid paralleling unsynchronized AC sources. The length (time) of such interruption is programmable but typically
set to be less than 3/4 of an electrical cycle, for example, less than 15 ms (50 Hz) or less than 12.5 ms (60 Hz).
4.3.5 Maintenance Mode (Manual Bypass)
If UPS maintenance or repair is necessary, you may use the maintenance switch to transfer the load to the maintenance bypass,
without interrupting the power supply to the load. This maintenance switch is fitted in all UPS modules and rated for the full load of
one module.
4.3.6 Parallel Redundancy Mode (System Expansion)
For higher capacity, higher reliability, or both, the outputs of multiple UPS modules can be programmed for direct paralleling while
a built-in parallel controller in each UPS ensures automatic load sharing. The parallel system may include up to four UPS modules.
4.4 Battery Management (Set Up During Commissioning)
4.4.1 Normal Function
1. Constant current boost charge.
The charge current can be set up.
2. Constant voltage boost charge.
The boost charge voltage can be set up as required by the type of battery.
For VRLA batteries, the maximum boost charge voltage should not exceed 2.4 V/cell.
3. Float charge.
The float charge voltage can be set up as required by the type of battery.
For VRLA batteries, the float charge voltage should be between 2.2 V/cell and 2.3 V/cell.
4. Float charge temperature compensation.
The temperature compensation coefficient can be set up as required by the type of battery.
Page 36
36 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Operation
5. EOD protection.
When the battery voltage drops to the EOD voltage, the battery converter shuts down automatically and the battery is isolated to
avoid further battery discharge. The EOD voltage may be set to any value between 1.6 V/cell and 1.75 V/cell (VRLA) or
0.9 V/cell and 1.1 V/cell (NiCd).
6. Battery low pre-warning time.
The battery low pre-warning time is adjustable between 3 min and 60 min. The default setting is 5 min.
4.4.2 Advanced Function
The UPS provides an advanced function, battery maintenance test. At regular intervals, 20% of the rated capacity of the battery will
be discharged automatically, providing the current load exceeds 20% of the rated UPS (kVA) capacity. If the load is less than 20%,
the automatic discharge cannot be performed. The interval can be set to between 30 and 360 days. The battery self-test can be
disabled.
Conditions: battery on float charge for at least 5 h, load equal to 20% to 80% of rated UPS capacity.
Trigger: Manually by the Battery Maintenance Test command on the LCD or automatically.
Battery maintenance interval: 30 to 360 days (default setting: 60 days).
4.5 Battery Protection (Set Up by Commissioning Engineer)
Battery Low Pre-warning
The battery low pre-warning occurs before the EOD. After this pre-warning, the battery should be able to supply the full load for
another three minutes at the current discharge rate. The time can be configured to between 3 min and 60 min.
EOD Protection
When the battery voltage drops to the EOD voltage, the battery converter shuts down. The EOD voltage may be set to any value
between 1.6 V/cell and 1.75 V/cell (VRLA) or
0.9 V/cell and 1.1 V/cell (NiCd).
Battery Disconnect Device Alarm
The battery disconnect device alarm occurs when the battery disconnect device is tripped.
Page 37
User Manual 10H52192UM60 - Rev. 1 - 09/2011 37
Operator Control and Display Panel Liebert NX
Chapter 5 Operator Control and Display Panel
This chapter describes the functions of components on the operator control and display panel of the UPS and how to use them,
provides LCD display information, including the LCD screen types, detailed menu messages, prompt windows, and UPS alarm list,
and explains how to select the language and change the current date and time.
5.1 Introduction
The operator control and display panel is located on the front door of the UPS. It is the access point that enables the operator to
control the UPS and monitor all the measured parameters, UPS and battery status, and alarms. The operator control and display
panel is divided into three functional areas: mimic power flow chart, LCD display with menu keys, control keys, as shown in Figure
5-1. The components on the operator control and display panel are described in Table 5-1.
Figure 5-1 Operator Control and Display Panel
Table 5-1 Description of Operator Control and Display Panel
Part No. Function Key Function
1 Rectifier indicator
EPO EPO switch
2 Battery indicator INVERTER ON Inverter start switch
3 Bypass indicator INVERTER OFF Inverter shutdown switch
4 Inverter indicator FAULT CLEAR Fault reset switch
5 Output indicator SILENCE ON/OFF Audible alarm silencing switch
6 Status indicator F1 to F5 LCD menu keys
7 Buzzer
8 EPO switch cover
5.1.1 Indicators
The indicators mounted on the mimic power flow chart represent the various power paths and current UPS operational status. The
indicators are described in Table 5-2.
Table 5-2 Indicator Description
Indicator State Description
Rectifier indicator
Solid green Rectifier in normal operation
Flashing green Mains input normal, but rectifier not operating
Solid red Rectifier fault
Off Rectifier not operating, mains input abnormal
Battery indicator
Solid green Load on battery
Flashing green Battery EOD pre-warning
Solid red
Battery fault (failed, absent, or polarity reversed) or battery converter fault (failed,
overcurrent, or overtemperature)
Off Battery and battery converter normal, battery charging
Bypass indicator Solid green Load on bypass
3
6
5
2
4
7 8
Page 38
38 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Operator Control and Display Panel
Indicator State Description
Solid red Bypass power has fault or is outside specifications, or static bypass switch fault
Off Bypass normal
Inverter indicator
Solid green Load on inverter
Flashing green Inverter turning on, starting up, synchronizing
Solid red Inverter fault
Off Inverter not operating
Output indicator
Solid green UPS output on and normal
Solid red UPS output on and overloaded
Off UPS output off
Status indicator
Solid green Normal operation
Solid yellow Alarm (for example, AC input failure)
Solid red Fault (for example, fuse or hardware fault)
5.1.2 Audible Alarm (Buzzer)
UPS activity is accompanied by the three sounds, as described in Table 5-3.
Table 5-3 Audible Alarm Description
Alarm sound Meaning
A short beep Whenever a key on the operator control and display panel is pressed.
Beep every other second The UPS has a general fault, for example, AC input failure.
Continuous beep The UPS has a serious fault, for example, fuse or hardware fault.
5.1.3 Control Keys
The operator control and display panel provides five control keys, as described in Table 5-4.
Table 5-4 Description of Control Keys
Control key Label Description
EPO switch EPO
Cut off the load power, shut down the rectifier, inverter, static bypass, and
battery
Inverter start switch INVERTER ON Start the inverter
Inverter shutdown
switch
INVERTER OFF Shut down the inverter
Fault reset switch FAULT CLEAR Restart the UPS (subject to any fault being cleared)
Audible alarm silencing
switch
SILENCE ON/OFF
When an alarm is active, pressing this button silences the audible alarm.
Pressing this button again enables the buzzer again.
5.1.4 LCD and Menu Keys
The operator control and display panel features an LCD and five menu keys (F1 to F5). The menu keys are described in Table 5-5.
Table 5-5 Menu Key Description
Function 1
Function 2
F1 F2 F3 F4
ESC
Escape
Left
Up
Right
Down
Enter
Key F5
HOME
Featuring a 320 × 240 dot matrix graphic display, the user-friendly, menu-driven LCD allows you to easily browse through the input,
output, load, and battery parameters of the UPS, learn current UPS status and alarm information, perform functional settings, and
control operating modes. The LCD can also store up to 1024 historical records that can be retrieved for reference and diagnosis.
Page 39
User Manual 10H52192UM60 - Rev. 1 - 09/2011 39
Operator Control and Display Panel Liebert NX
5.2 LCD Screen Type
5.2.1 Start Screen
When the UPS is switched on, it performs a self-test, and the start screen appears for approximately 15 seconds, see Figure 5-2.
Figure 5-2 Start Screen
5.2.2 Primary Screen
After the UPS self-test is complete, the primary screen appears, see Figure 5-3. The primary screen is divided into four windows:
system information window, data window, menu window, and keypad window.
Figure 5-3 Primary Screen
The functions of the menu keys F1 to F5 on the screen vary according to the current selection and are indicated by self-explanator y
icons in the keypad window. Press the F1 key in any menu on the primary screen to return to the output menu.
Data window
Menu window
Keypad window
System information window
Page 40
40 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Operator Control and Display Panel
5.2.3 Default Screen
During UPS operation, if no alarms are activated within two minutes, the default screen will appear, as shown in Figure 5-4. After a
short delay, the LCD backlight will turn off. Press any menu key (F1 to F5) to restore the default screen.
Figure 5-4 Default Screen
5.3 Detailed Description of Menu Items
The description that follows refers to the LCD primary screen shown in Figure 5-3.
System Information Window
The system information window displays the current time, UPS name, configuration, and audible alarm state. There are no
user-operated functions in this window. For details, see Table 5-6.
Table 5-6 Item Description of System Information Window
Item Explanation
NX UPS name
12:30:36 Current time (format: 24 hours, hours, minutes, seconds)
1# Unit 1
/ Audible alarm enabled or disabled. : disabled; : enabled
Menu Window and Data Window
The menu window provides access to the data window menus. The data window displays the items associated with the menu
selected in the menu window. The user can browse the UPS parameters and set up the functions using the menu and data windows.
See Table 5-7 for more details.
Table 5-7 Item Description of Menu Window and Data Window
Menu Item Explanation
Mains
L-N voltage (V) Phase voltage
L-N current (A) Phase current
Frequency (Hz) Input frequency
L-L voltage (V) Line voltage
Power factor Power factor
Bypass
L-N voltage (V) Phase voltage
Frequency (Hz) Bypass frequency
L-L voltage (V) Line voltage
Output
L-N voltage (V) Phase voltage
L-N current (A) Phase current
Frequency (Hz) Output frequency
Page 41
User Manual 10H52192UM60 - Rev. 1 - 09/2011 41
Operator Control and Display Panel Liebert NX
Menu Item Explanation
L-L voltage (V) Line voltage
Output Power factor Power factor
Load
Sout (kVA) Sout: apparent power
Pout (kW) Pout: active power
Qout (kVAR) Qout: reactive power
Load level (%) Load (expressed in percentage of the phase rating load)
Crest factor Output current crest factor
System
Sout (kVA) Sout: apparent power of the parallel system
Pout (kW) Pout: active power of the parallel system
Qout (kVAR) Qout: reactive power of the parallel system
Single unit, no parallel
system data
Displayed in this data window when the UPS is configured as a single unit.
Battery
Battery voltage (V) Battery bus voltage
Battery current (A) Battery bus current
Battery temperature (°C) Battery temperature
Battery remain time (min) Remaining battery backup time (only in battery operation)
Battery capacity (%) Percentage of battery life when compared to a new battery.
Battery boost charging Battery is boost charging.
Battery float charging Battery is float charging.
Battery is not connected Battery is not connected
Event (active status/alarm)
Displays the status/active alarms. For the list of the status/alarms that may be
displayed on the UPS operator control and display panel LCD, refer to Table 5-9.
Records (status/alarm history)
Displays the status/alarm history. For the list of the status/alarms that may be
displayed on the UPS operator control and display panel LCD, refer to Table 5-9.
Language (language option) Provides 12 optional languages for the LCD.
Settings
Display contrast Adjusts the LCD contrast
Date format set Three formats selectable: MM/DD/YYYY, DD/MM/YYYY, YYYY/MM/DD
Date & time Sets the date and time.
Comm1 baud rate Sets the RS232 communication baud rate of the RS232 port and IntelliSlot port 1.
Comm2 baud rate Set the RS232 communication baud rate of IntelliSlot port 3.
Comm3 baud rate Set the RS485 communication baud rate of IntelliSlot ports 1 to 3.
Communication address Applicable to RS485 communication.
Communication mode Sets the communication mode.
Callback times
When the IntelliSlot 1 port communication mode is set to modem, this parameter
sets the number of callback attempts for each new alarm.
Phone No.1
Sets the first priority telephone number to be dialed in the event of an alarm when
the IntelliSlot port 1 communication mode is set to modem.
Phone No.2
Sets the second priority telephone number to be dialed in the event of an alarm
when the IntelliSlot port 1 communication mode is set to modem.
Phone No.3
Sets the third priority telephone number to be dialed in the event of an alarm
when the IntelliSlot port 1 communication mode is set to modem.
Command password The user can modify the command password.
Protocol Chose "Velocity" to communicate with IS-WEBL, IS-485L, IS-485EXI
Command
(initiate, stop
battery, system
test, or freshening
charge)
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 evaluation 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 window
appears about five seconds later to show the test result.
Stop testing Manually stops a battery maintenance test, battery capacity test, or system test.
Freshening charge Manually initiates a battery freshening charge.
Stop freshening charge Manually stops a battery freshening charge.
Modem auto-answer
enabled
Manually enable the modem’s auto-answer f
unction.
Eff. Curve (efficiency-load diagram)
Shows the load (expressed in percentage of the UPS rating load ) and the
corresponding efficiency (expressed in percentage) in numerical and graphic
format.
Page 42
42 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Operator Control and Display Panel
Menu Item Explanation
Run Time (runtime) Shows the UPS runtime and the bypass runtime: DDDD/HH/MM
Version
UPS version Provides UPS inverter, rectifier, bypass, and monitoring software versions.
UPS model Provides UPS model information, for example, 400V-60Hz.
Keypad Window
The current functions of the menu keys F1 to F5 on the screen are indicated by self-explanatory icons in the keypad window.
5.4 Prompt Window
A prompt window is displayed while the system is operating in order to alert you to certain conditions or request you to confirm a
command. The prompts are described in Table 5-8.
Table 5-8 Prompts and Meanings
Prompt Meaning
Transfer with interrupt, confirm or cancel
The inverter and bypass supplies are not synchronized and any load transfer
between the inverters and bypass will cause a brief load interruption.
The load is too high to be transferred without
interrupt
The total load must be less than the capacity of one UPS to allow a parallel system
to perform an uninterrupted transfer from bypass to inverter.
This operation will interrupt the supply to the
load, confirm or cancel
The bypass is out of tolerance, turning off the inverters will cause the load to be
de-energized.
This operation will cause inverter overload,
confirm or cancel
Turning off this inverter will overload the remaining inverter(s) in a parallel system.
Turn on more UPS to supply current load
The number of inverters already turned on is insufficient to supply the existing load.
The user must turn on more inverters.
Battery will be discharged, confirm or cancel
If you select battery maintenance test, the battery will discharge until the UPS
shuts down. This prompt is a confirmation request. Select Cancel to abort the test
and return the UPS to normal operating mode.
System self-test finished, everything is OK No action required.
Please check the current warnings Check the active alarm messages.
Enter control password Required for battery or UPS test (default: 123456).
Battery Self Test aborted, conditions not met
Battery self-test condition is not met. Please check whether the battery is in boost
charge state and the load is more than 20%.
Battery Refresh Charge aborted, conditions not
met
This prompt appears when you select the Refresh Charge command while the
battery Refresh Charge condition (such as no battery, charger failure) is not met.
5.5 Status/Alarm List
Table 5-9 provides the complete list of UPS status/alarm messages that are displayed either in the Event menu or the Records menu
described in Table 5-7.
Table 5-9 Status/Alarm List
Status/Alarm Explanation
Comm. fail Communications between the internal monitor and the rectifier, inverter or bypass have failed.
Parallel Comm. Fail
Communications between the inverter of each UPS in the parallel system have failed.
1.Check if any UPS modules are offline. If so, switch on these UPS and check if the alarm disappears.
2. Press the FAULT CLEAR button.
Battery Overtemp. The battery temperature is over the limit. Check the battery temperature and ventilation.
Ambient Overtemp. The ambient temperature is over the limit. Check the ventilation in the UPS room.
Battery Replaced Battery test failed. The battery must be replaced.
Battery Low Pre-warning
Before reaching EOD, the battery low pre-warning is activated. After this pre-warning, the battery should
be able to supply the full load for another three minutes at the current discharge rate. The time can be
configured to between 3 min and 60 min. Please make sure that you shut the load down in time.
Battery End of Discharge Inverters turned off due to battery EOD. Check the mains failure and try to recover it.
Mains Volt. Abnormal
The mains voltage is outside specifications and results in rectifier shutdown. Check the rectifier input phase
voltage.
Mains Undervoltage Mains voltage is under the limit with derated load. Check the rectifier input line voltage.
Mains Freq. Abnormal
The mains frequency is exceeding the tolerance and has caused the rectifier to shutdown. Check the
rectifier input voltage and frequency.
Page 43
User Manual 10H52192UM60 - Rev. 1 - 09/2011 43
Operator Control and Display Panel Liebert NX
Status/Alarm Explanation
Batt. Charger Fail The voltage of the battery charger is too high.
Control Power 1 Fail The UPS is operating but the control power is abnormal or not available.
Mains Phase Reversed The AC input phase rotation is reversed.
Rectifier Fault
An internal power module fault has been detected, the rectifier has been shut down and the battery is
discharging.
Rectifier Overtemp
The temperature of the heatsink is too high to keep the rectifier running. The UPS can recover from this
fault automatically. Check the surrounding area and ventilation.
Soft Start Fail
The rectifier can not start due to low DC bus voltage. Seek assistance from your local Emerson customer
service center.
Bypass Unable to Trace
This alarm is triggered by an inverter software routine when the amplitude or frequency of the bypass
voltage is outside specifications. The amplitude threshold is fixed for ±10% rating. This alarm automatically
resets once the bypass voltage becomes normal.
1. First, verify that the bypass voltage and frequency displayed on the LCD are within the selected ranges.
Note that the rated voltage and frequency are determined here by the output voltage level and output
frequency level respectively.
2. If the displayed voltage appears to be abnormal, check the voltage and frequency of the UPS bypass
supply. Check the external supply if they are exceeding the tolerance.
Bypass Abnormal
This alarm is triggered by an inverter software routine when the amplitude or frequency of the bypass
voltage exceeds the limit. The amplitude threshold is fixed for ±10% rating. This alarm automatically resets
once the bypass voltage returns to normal.
1. First, check if any associated alarms such as Bypass Phase Reverse and Mains Neutral Lost are active. If
they are, correct them first.
2. Then verify that the bypass voltage and frequency displayed on the LCD are within the bypass limits.
Note that the rated voltage and frequency are determined here by the output voltage level and output
frequency level respectively.
3. If the displayed voltage appears to be abnormal, check the voltage and frequency of the UPS bypass
supply. If the bypass voltage and frequency are abnormal, check the external bypass supply.
4. If the mains tends to trigger this alarm frequently, the bypass tolerance limits can be increased using the
service configuration software.
Inverter Asynchronous
This alarm is triggered by an inverter software routine when the inverter and bypass waveforms are more
than six degrees out of phase. The amplitude threshold is fixed for ±10% rating. This alarm resets
automatically once the condition is no longer true.
1. First, check if the alarms Bypass Unable to Trace or Bypass Abnormal occur. If they do, correct this first.
2. Verify the waveform of the bypass voltage.
Inverter fault
Inverter output voltage outside specifications. Load transfers to bypass. The faulty power module will shut
down and open output relay, and the remaining power
modules will remain online.
Fan fault At least one of the cooling fans failed.
Bypass STS Fail At least one of the STS on the bypass side is open or shorted. This fault is locked until power-off.
Output Fuse Fail
At least one of the inverter output fuses has blown. The inverter shuts down and the load transfers to
bypass if the remaining power modules are insufficient to supply the load.
Control Power 2 Fail The UPS is operating but the redundant control power is abnormal or not available.
Unit Over Load
This alarm appears when the load exceeds 105% of the nominal rating. The alarm automatically resets once
the overload condition is removed.
1. Find out if this alarm is correct by checking which phase is overloaded, as indicated on the load (%)
displayed on the LCD.
2. If this alarm is correct, measure the actual output current to confirm if the displayed value is correct.
3. If this is the case, disconnect the non-critical load.
In a parallel system, this alarm will be triggered if the load is severely unbalanced.
System Over Load
This alarm appears when the total load exceeds 105% of the nominal rating of the parallel system. The
alarm automatically resets once the overload condition is removed.
1. Find out if this alarm is true by checking which phase on which unit is overloaded, as indicated on the
load (%) displayed on the LCD.
2. If this alarm is correct, measure the actual output current to confirm if the displayed value is correct.
3. If this is the case, disconnect the non-critical load.
This alarm will be triggered if the load is severely unbalanced.
Page 44
44 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Operator Control and Display Panel
Status/Alarm Explanation
Unit Over Load Timeout
The UPS overload status continues and the overload times out.
Note that:
1. The highest loaded phase will indicate overload time-out first.
2. When the timer is active, then the alarm Unit Over Load should also be active as the load is above the
nominal rating.
3. When the time has expired, the load transfers to static bypass. The inverter shuts down and will restart
after 10 seconds.
4. If the load drops below 95%, after five minutes the system will transfer back to the inverter. Check the
load (%) displayed on the LCD to confirm if this alarm is correct. If the LCD indicates that an overload has
occurred, check the actual load and confirm if the UPS was overloaded before the alarm occurred.
Byp. Abnormal Shutdown Both the bypass and inverter voltages are abnormal and the output is off.
Inverter Over Current An inverter current overload has occurred.
Bypass Phase Reversed
The phase rotation of the bypass voltage is reversed. Normally, phase L2 lags 120 degrees behind phase L1,
and phase L3 lags 120 degrees behind phase L2.
Check that the phase rotation of the UPS bypass supply is correct.
Load Impact Transfer
A transfer to bypass occurred due to a large step load. The UPS can recover automatically. Turn on the load
equipment in stages to reduce the load impact on the inverter.
Transfer Time-out
The load remains on bypass power due to an excessive number of transfers that occurred within the last
hour. The UPS can recover automatically and will transfer the load back to inverter power within an hour.
Load Sharing Fault The UPS in a parallel system are not sharing the load current correctly.
DC Bus Abnormal The DC bus voltage is abnormal and results in inverter shutdown. The load transfers to bypass.
System Transfer
All UPS in the parallel system transfer to bypass at the same time when one of them needs to transfer to
bypass. This message appears on the LCD of the UPS with passive transfer to bypass.
DC Bus Over Voltage
The rectifier, inverter and battery converter shut down because the DC bus voltage is too high. Check if
there are any faults affecting the rectifier. If there are not any, check if an overload has occurred. Restart
the inverter after the fault has been cleared.
Bypass Over Current
The bypass current exceeds 135% of the rated current. The UPS generates an alarm but takes no further
action.
LBS Active The LBS setting is active. The UPS is acting as an LBS master or slave in a dual bus configuration.
Mains Neutral Lost The neutral line of the AC input mains is not detected.
Manual Turn On INVERTER ON button activated on the operator control and display panel to turn on the inverter.
Manual Turn Off INVERTER OFF button activated on the operator control and display panel to turn off the inverter.
EPO The local or remote EPO has been activated.
Interrupted Transfer
Confirm
A prompt for the user to decide whether to press the Enter key to acknowledge an interrupted load transfer
to bypass.
Transfer Cancel
A prompt for the user to decide whether to press the ESC key to avoid an interrupted load transfer to
bypass.
Unit Risk Off Confirm A prompt for the user to decide whether to press the Enter key to shut down a UPS in the parallel system.
Parallel System Risk Off
Confirm
A prompt for the user to decide whether to press the Enter key to shut down the parallel system.
Fault Reset FAULT CLEAR button pressed.
Alarm Silence SILENCE ON/OFF button pressed.
Turn On Fail
The inverter failed to turn on when the INVERTER ON button was pressed. This may be the result of an
invalid operation (maintenance bypass on) or DC bus or rectifiers may not be ready.
Audible Alarm Reset FAULT CLEAR or SILENCE ON/OFF button pressed.
Bypass Mode The UPS is in bypass mode.
Normal Mode The UPS is in normal mode.
Battery Mode The UPS is in battery mode.
Source share mode The inverter is supplied by the battery and rectifier at the same time.
UPS Shutdown UPS shutdown with no output power.
Batt. Float Charging Battery status (float charge mode)
Batt. Boost Charging Battery status (boost charge mode)
Battery Discharging Battery status (discharge mode)
Battery Period Testing The battery is undergoing the automatic periodic battery maintenance test (20% capacity discharge).
Batt. Capacity Testing The user initiated a battery capacity test (100% capacity discharge).
Battery Maintenance
Testing
The user initiated a maintenance test (20% capacity discharge).
Page 45
User Manual 10H52192UM60 - Rev. 1 - 09/2011 45
Operator Control and Display Panel Liebert NX
Status/Alarm Explanation
Inverter in Setting The inverter starts up and is synchronized.
Rectifier in Setting The rectifier starts up and is synchronized.
Battery Room Alarm The temperature in the battery room is high and requires attention.
Battery Reverse Reconnect battery and check battery wiring.
Auto start After UPS shutdown at EOD, the inverter automatically starts when the mains supply is restored.
Rec Flash Update Rectifier software being updated.
Inv Flash Update Inverter software being updated.
Monitor Flash Update Monitoring software being updated.
Bypass Flash Update Bypass software being updated.
LBS abnormal LBS abnormal
Page 46
46 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Operating Instructions
Chapter 6 Operating Instructions
This chapter provides detailed instructions for UPS operating procedures.
The audible alarm may be activated at various points during these procedures. Press the SILENCE ON/OFF button to silence the
audible alarm at any time.
Warning: Hazardous mains and/or battery voltage present behind protective cover
The components that can only be accessed by opening the protective cover with tools may not be operated by the user. Only qualified
service personnel are authorized to remove such covers.
Note
It is inevitable that the batteries will lose charge during transportation and storage; before attempting to carry out an autonomy test,
ensure that the batteries are fully charged as this may take several hours. Block performance typically improves after a few
discharge/recharge cycles.
6.1 Power Switches (Behind the Front Door)
The UPS is fitted with the following power switches:
- an input switch for rectifier (mains) input (QS1)
- an input switch for bypass input (QS2)
- a maintenance switch (QS3)
- an output switch (QS4)
- two battery circuit breakers (QS6 for Batt + and QS7 for Batt -)
All these switches are shown in Figure 6-1, Errore. L'origine riferimento non è stata trovata. and Figure 6-2.
Figure 6-1Location of Maintenance Switch of 30 kVA UPS
Maintenance switch
Page 47
User Manual 10H52192UM60 - Rev. 1 - 09/2011 47
Operating Instructions Liebert NX
Figure 6-2 Location of Maintenance Switch of 40-60 kVA UPS
6.2 UPS Startup Procedures
These procedures are based on the assumption that the installation is complete, the system has been commissioned by authorized
personnel, and the external protective devices are closed.
6.2.1 Procedure for Startup in Normal Mode
Warning
1. These procedures result in mains voltage being applied to the UPS output terminals.
2. If any load equipment is connected to the UPS output terminals, check with the user that it is safe to apply power. If the load is not
ready to receive power, ensure that it is safely isolated from the UPS output terminals.
3. Do not start the UPS until the installation procedures are complete and the system has been commissioned by authorized personnel.
Use the following procedure to turn on the UPS from a fully powered down condition. In a parallel system, perform each step of the
procedure on every UPS module before proceeding to the next step.
1. Close the UPS input switches QS1 (mains input) and QS2 (bypass input) to connect the mains power to the UPS.
At this point, the LCD starts up. The rectifier indicator flashes green during rectifier startup. About 30 seconds after the rectifier
enters normal operation, the green rectifier indicator remains on (not flashing). After system initialization, the bypass STS is closed
and the green bypass indicator remains on (not flashing). The red battery indicator is illuminated.
2. Close the internal and/or external battery circuit breakers (internal QS6 and QS7).
At this point the battery indicator turns off.
3. Close the output switch QS4.
The UPS indicator states are as listed in Table 6-1.
Table 6-1 UPS Indicator State
Indicator State
Rectifier indicator Green
Battery indicator Off
Bypass indicator Green
Maintenance switch
Page 48
48 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Operating Instructions
Indicator State
Inverter indicator Off
Output indicator Green
Status indicator Amber
4. Ensure that the maintenance switch QS3 is in the OFF position.
5. Press and hold the INVERTER ON button for 2 seconds.
The inverter starts up and the inverter indicator flashes green. When the inverter is ready, the UPS transfers from bypass to inverter,
the bypass indicator turns off, and the green inverter indicator remains on (not flashing).
The UPS is in normal mode and the UPS indicator states are as listed in Table 6-2.
Table 6-2 UPS Indicator State
Indicator State
Rectifier indicator Green
Battery indicator Off
Bypass indicator Off
Inverter indicator Green
Output indicator Green
Status indicator Green
Page 49
User Manual 10H52192UM60 - Rev. 1 - 09/2011 49
Operating Instructions Liebert NX
6.2.2 Procedure for Startup Without Input Supply
1. Verify that the battery is connected correctly.
2. Close the internal and/or external battery circuit breakers (internal QS6 and QS7).
3. Close the output switch QS4.
4. Press the battery start button (see Figure 6-3) on the front panel of any power module.
At this point, the LCD starts up and the battery indicator starts flashing green. After the rectifier has operated normally for 30
seconds, the green battery indicator remains on (not flashing).
电池启动按钮
Battery start button
Figure 6-3 Location of Battery Start Button
Note
After step 4, if any of the following conditions occur, disconnect the battery. The system can be started up one minute later.
EPO action
Fault in system commissioning
5. Press and hold the INVERTER ON button on the operator control and display panel for 2 seconds; the UPS begins to operate in
battery mode.
6. If the UPS is to switch from battery mode to normal mode when the mains power supply is restored, the input switches QS1 and
QS2 must be closed.
6.3 Procedures for Transfer Between Operating Modes
6.3.1 Transfer from Normal Mode to Battery Mode
Open the mains input switch QS1 to transfer the UPS to battery mode.
To transfer the UPS back to normal mode, wait for several seconds, then close the mains input switch QS1 to reconnect the mains
power to the UPS. 10 seconds later, the rectifier restarts feeding power to the inverter automatically.
Note
If the battery voltage drops to the EOD voltage, the load will be transferred to bypass (precondition: Bypass input switch QS2 is closed
and the bypass voltage is as in the specification). In bypass mode, the load is fed directly by the mains power instead of the pure AC
power from the inverter.
6.3.2 Transfer from Normal Mode to Bypass Mode
When the UPS is in normal mode, if the INVERTER OFF button on the operator control and display panel is pressed, the UPS is
transferred from normal mode to bypass mode.
Note
In bypass mode, the load is fed directly by the mains power instead of the pure AC power from the inverter.
Page 50
50 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Operating Instructions
6.3.3 Transfer from Bypass Mode to Normal Mode
When the UPS is in bypass mode, press the INVERTER ON button on the operator control and display panel. When the inverter
enters normal operation, the UPS is transferred from bypass mode to normal mode.
6.3.4 Transfer from Normal Mode to Maintenance Mode
This procedure transfers the load from the UPS inverter output to the maintenance bypass supply, but with the precondition that
the UPS is in normal mode.
Caution
Before performing this operation, read the information on the LCD to make sure that the bypass supply is normal and that the inverter
is synchronous with the bypass supply, so as not to risk a short interruption in the supply of power to the load.
Use the following procedure to transfer the UPS from normal mode to maintenance mode. In a parallel system, perform each step
of the procedure on every UPS module before proceeding to the next step.
1. Press and hold the INVERTER OFF button on the operator control and display panel for 2 seconds.
At this point, the inverter indicator turns off, the bypass indicator turns on, and the status indicator changes to amber,
accompanied by an audible alarm. The load transfers to the bypass and the inverter shuts down.
Note
Pressing the SILENCE ON/OFF button silences the audible alarm but leaves the alarm message displayed until the alarm condition is
rectified.
2. For a single UPS, close the maintenance switch QS3; for a 1+N parallel system, close the external maintenance switch.
3. Open the internal and/or external battery circuit breakers (internal QS6 and QS7).
4. Open the output switch QS4.
5. Open the input switches QS1 and QS2.
At this point, the load power supply is provided by the manual maintenance bypass.
Warning
1. If you need to carry out maintenance work on a faulty module, wait for 10 minutes to let the internal DC bus capacitor fully discharge
before removing the faulty module for maintenance.
2. When the UPS is in maintenance operating mode, the neutral line is still energized. Therefore, only qualified personnel must perform
maintenance work on the UPS.
Caution
When the UPS is in maintenance mode, the load is not protected against abnormal mains supply conditions.
6.3.5 Transfer from Maintenance Mode to Normal Mode
After carrying out maintenance work on the UPS, you can use this procedure to transfer the load from the maintenance bypass to
the inverter. Use the following procedure to transfer the UPS from maintenance mode to normal mode. In a parallel system,
perform each step of the procedure on every UPS module before proceeding to the next step.
1. Close the input switches QS1 (mains input) and QS2 (bypass input) of the UPS to feed the mains power to the UPS.
At this point, the LCD starts up. The rectifier indicator flashes green during rectifier startup. After about 30 seconds, the rectifier
enters normal operation. Following system initialization, the bypass STS is closed.
2. Close the internal and/or external battery circuit breakers (internal QS6 and QS7).
3. Close the output switch QS4.
The UPS indicator states are as listed in Table 6-1.
Page 51
User Manual 10H52192UM60 - Rev. 1 - 09/2011 51
Operating Instructions Liebert NX
4. For a single UPS, open the maintenance switch QS3; for a 1+N parallel system, open the external maintenance switch.
5. Press and hold the INVERTER ON button for 2 seconds.
The inverter starts up and the inverter indicator flashes green. When the inverter is ready, the UPS transfers from bypass to inverter,
the bypass indicator turns off, and the green inverter indicator remains on (not flashing). The UPS is in normal mode and the UPS
indicator states are as listed in Table 6-2.
6.4 Procedure for Completely Powering Down the UPS
Caution
The following procedure will switch off all power to the load.
Warning: Hazardous battery voltage
The UPS battery and connecting terminals remain energized at hazardous voltage levels at all times.
The following procedure is used to completely power down the UPS and load. All power switches, isolators, and circuit breakers will
be opened and the power will be removed from the load. In a parallel system, perform each step of the procedure on every UPS
module before proceeding to the next step.
1. Press and hold the INVERTER OFF button on the operator control and display panel for 2 seconds.
At this point, the inverter indicator turns off, the bypass indicator turns on, and the status indicator changes to amber,
accompanied by an audible alarm. The load transfers to the bypass and the inverter shuts down.
2. Open the internal and/or external battery circuit breakers (internal QS6 and QS7).
3. Open the input switches QS1 (mains input) and QS2 (bypass input) of the UPS.
At this point, in parallel systems the other UPS modules report Parallel Comm. Fail, which is normal. Other UPS modules continue to
supply the load through the inverter.
All of the indicators and the LCD on the operator control and display panel will be switched off as the mains-driven internal power
supplies decrease.
4. Open the output switch QS4 on the UPS.
6.5 Procedure for Completely Powering Down the UPS While Maintaining the
Power Supply to the Load
Caution
Ensure that the UPS has been installed with an external maintenance bypass cabinet before carrying out this procedure.
The following procedure is used to completely power down the UPS while maintaining the power supply to the load. In a parallel
system, perform each step of the procedure on every UPS module before proceeding to the next step.
1. Use the procedure in 6.3.4 Transfer from Normal Mode to Maintenance Mode to transfer the UPS to maintenance mode.
2. Close the maintenance switch on the external maintenance bypass cabinet.
3. Open the external circuit breakers or other protective devices at the input of the UPS.
4. Open the external output switch on the UPS.
6.6 Isolation Procedure (for One UPS in a Parallel System)
Caution
The following procedure will switch off all power to the load.
Warning: Hazardous battery voltage
The UPS battery and connecting terminals remain energized at hazardous voltage levels at all times.
The following procedure is used to isolate one UPS in a parallel system.
1. Press and hold the INVERTER OFF button on the operator control and display panel for 2 seconds.
2. Open the input switches QS1 and QS2 on the UPS and disconnect the battery.
Page 52
52 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Operating Instructions
At this point, the other UPS modules report Parallel Comm. Fail, which is normal. The other UPS modules continue to supply the
load through the inverter.
3. Open the output switch QS4 on the UPS.
4. Wait for 10 minutes before carrying out maintenance or repair work on the UPS.
6.7 Insertion Procedure (for One UPS in a Parallel System)
This procedure is used to reintegrate a UPS that has previously been isolated from a parallel system. This procedure is based on the
assumption that the installation is complete and that the system has been commissioned by authorized personnel.
1. Close the output switch QS4 on the UPS to be reintegrated.
2. Close the input switches QS1 and QS2 on the UPS and connect the battery.
3. Press and hold the INVERTER ON button on the UPS for 2 seconds.
The inverter starts up and the inverter indicator starts flashing green. When the inverter is ready, the UPS transfers to parallel
operation with the other UPS modules, and the inverter indicator remains on (not flashing).
The UPS is in normal mode and the UPS indicator states are as listed in Table 6-3.
Table 6-3 UPS Indicator State
Indicator State
Rectifier indicator Green
Battery indicator Off
Bypass indicator Off
Inverter indicator Green
Output indicator Green
Status indicator Green
6.8 EPO Procedure
The EPO switch is designed to switch off the UPS in an emergency (i.e. fire, flood, etc.). The system will turn off the rectifier and
inverter, will stop supplying the load immediately (including the inverter and bypass), and the battery will stop charging or
discharging.
If the input mains is present, the UPS control circuit will remain active; however, the output will be turned off. To remove all power
from the UPS, open the external feeder breaker.
Note
In a parallel system, the EPO only isolates the UPS that has an EPO that has been activated.
6.9 Automatic Restart
In the case of a mains failure, the UPS draws power from the battery system to supply the load until the batteries are depleted.
When the UPS reaches its EOD threshold, it will shut down.
The UPS will automatically restart and enable output power:
after the mains power is restored
if Auto Recovery after EOD Enabling is enabled
after the Auto Recovery once the EOD Delay Time expires (the default delay is 10 minutes); during the automatic
recovery delay, the UPS will charge 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 UPS manually by pressing the FAULT CLEAR
button.
Page 53
User Manual 10H52192UM60 - Rev. 1 - 09/2011 53
Operating Instructions Liebert NX
6.10 UPS Reset Procedure
After the EPO is activated or the UPS is shutdown due to inverter overtemperature, overload, battery overvoltage, or too many
transfer times, once all appropriate measures have been taken to rectify the problem indicated by the alarm message on the LCD,
carry out the following procedures to restore the UPS to normal operation.
1. Press the FAULT CLEAR button to enable the system to exit the shutdown state.
2. When the rectifier begins to operate normally (rectifier indicator green), press and hold the INVERTER ON button for 2 seconds.
Note
1. The rectifier will start and the bypass will begin to supply the load. The rectifier indicator flashes while the rectifier is starting up.
When the rectifier enters normal operation (about 30 seconds later), the rectifier indicator turns green.
2. The rectifier will be turned on automatically when the overtemperature fault disappears 5 minutes after the disappearance of
overtemperature signals.
If the mains input is cut off, the UPS will shut down completely when the EPO switch is pressed. The UPS will start up in bypass when
the mains input is returned. There will be power at the output terminals of the UPS.
Warning
1. If the maintenance switch QS3 is in the ON position and the mains input is present, there will be power at the output terminals of the
UPS.
2. If you need to carry out maintenance work on a faulty module, wait for 10 minutes to let the internal DC bus capacitor fully discharge
before removing the faulty module for maintenance.
6.11 Selecting the Display Language
The LCD menu and data display is available in 12 languages: Chinese, Dutch, English, French, German, Italian, Japanese, Polish,
Portuguese, Russian, Spanish, and Swedish.
Use the following procedure to select the language:
1. On the Output menu screen, press the F3 (left) or F4 (right) key to select the Language menu.
2. Press the F5 (enter) key to move the cursor to the screen data window.
3. Press the F3 (left) or F4 (right) key to select the desired language.
4. Press the F5 (enter) key to confirm.
5. Press the F2 (ESC) key repeatedly to return to the Output menu. At this point, the LCD display is shown in the selected language.
6.12 Changing the Current Date and Time
Use the following procedure to change the system date and time:
1. On the Output menu screen, press the F3 (left) or F4 (right) key to select the Settings menu.
2. Press the F5 (enter) key to move the cursor to the screen data window.
3. Press the F3 (up) or F4 (down) key to select the Date & Time item and then press the F5 (enter) key to confirm.
4. Press the F3 (up) key to change the position indicated by the small cursor. Press the F4 (right) key to change the small cursor
position.
5. Press the F5 (Enter) key to confirm and press the F2 (ESC) key to return to the Output menu.
6.13 Control Password
Password protection is used to limit the control functions that are accessible to the operator. The default password is ‘12345’. This
password provides access to UPS and battery test functions.
Page 54
54 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Service
Chapter 7 Service
This chapter covers UPS servicing, including the service procedures for the power module and bypass modules and the replacement
procedure for the air filters.
Warning: Hazardous mains and/or battery voltage present behind protective cover
1. The components that can only be accessed by opening the protective cover with tools may not be operated by the user. Only
qualified service personnel are authorized to remove such covers.
2. When performing maintenance work on the UPS, note that the neutral line is energized.
7.1 Service Procedures for Power Module and Bypass Module
7.1.1 Notes
1. Only customer service engineers may service the power and bypass modules.
2. Remove the power modules and bypass module from top to bottom to prevent the cabinet tipping over due to the high center of
gravity.
3. To ensure safety, before servicing the power modules and bypass module, be sure to use a multimeter to verify that the DC bus
capacitor voltage is lower than 60 Vdc, and that the voltages between the earth and the components you are going to work on are
below hazardous levels, i.e. lower than 60 Vdc or 42.4 Vac peak value.
4. The bypass module cannot be swapped. Only when the UPS is transferred to internal or external maintenance bypass or
completely powered down can the bypass module be removed.
5. After the power modules and bypass module have been removed, wait 10 minutes before servicing them.
7.1.2 Service Procedure for Power Modules
Provided that the UPS is in normal mode and that the bypass is normal:
1. If the available UPS power modules have redundancy, proceed to step 2; if not, press and hold the INVERTER OFF button on the
operator control and display panel for two seconds to manually turn off the inverters; the UPS transfers to bypass mode.
2. Set the Ready switch on the front panel of the power module to the up position (i.e. in unready state).
3. Two minutes later, remove the fixing screws on both sides of the front panel of the module and pull the module out of the
cabinet.
Note
The module will be blocked by a spring bolt located on the left side of the module when the module is pulled halfway out of the cabinet.
At this point, you must press the spring bolt before continuing to pull the module out.
4. After servicing the module, check that the address of this module is different from those of other modules and that the address is
in the range from one to five (one to six for 200 kVA UPS). Check that the Ready switch is in the unready state.
5. Insert the module into the cabinet (after at least another 10 seconds) and tighten the screws on both sides.
6. Wait for two minutes and then set the Ready switch on the module to the down position; the module will connect to the system.
If the UPS has been transferred to bypass, press and hold the INVERTER ON button for two seconds to start all the power modules.
7.1.3 Service Procedure for Bypass Module
Provided that the UPS is in normal mode and that the bypass is normal:
1. Press and hold the INVERTER OFF button on the operator control and display panel for two seconds to manually turn off the
inverters; the UPS transfers to bypass mode.
2. Close the maintenance bypass switch QS3; the UPS transfers to maintenance mode.
3. Open the internal and/or external battery circuit breakers (internal QS6 and QS7).
4. Open the UPS output switch QS4 and the input switches QS1 and QS2.
5. Remove the fixing screws on both sides of the front panel of the bypass module and pull the module out of the cabinet. Wait for
10 minutes before servicing the bypass module.
6. After servicing the module, insert the module into the cabinet (after at least another 10 seconds) and tighten the screws on both
sides.
Page 55
User Manual 10H52192UM60 - Rev. 1 - 09/2011 55
Service Liebert NX
7. Close the UPS output switch QS4 and the input switches QS1 and QS2 in turn.
Two minutes later, the bypass indicator on the operator control and display panel turns on, indicating that the UPS is operating in
bypass mode.
8. Open the maintenance switch QS3, press and hold the INVERTER ON button on the operator control and display panel for two
seconds to manually turn on the inverters; the UPS transfers to normal mode.
7.2 Air Filter Replacement Procedure
As shown in Figure 7-1 and Figure 7-2, the UPS is equipped with air filters on the back of the front door. Each air filter is secured by a
fixing bar on both sides. To replace the air filter, proceed as follows:
1. Open the front door of the UPS to access the air filters on the back of the door.
2. Remove the fixing bar on either side of the air filter and loosen the fixing screws of the fixing bar on the other side; it is not
necessary to remove this fixing bar.
3. Remove the air filter and insert a clean one.
4. Reinstall the fixing bar in its original position.
5. Tighten the fixing screws of the fixing bar on the other side.
Figure 7-1 Replacing Air Filter on 30 kVA UPS
Page 56
56 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Service
Figure 7-2 Replacing Air Filter on 40 /60 kVA UPS
Page 57
User Manual 10H52192UM60 - Rev. 1 - 09/2011 57
Product Specifications Liebert NX
Chapter 8 Product Specifications
The chapter lists the UPS specifications.
8.1 Conformity and Standards
The UPS has been designed to conform to the European and international standards listed in Table 8-1.
Table 8-1 European and International Standards
Item Normative reference
General and safety requirements for UPS used in operator access areas EN62040-1/IEC62040-1
EMC requirements for UPS EN62040-2/IEC62040-2
Method of specifying the performance and test requirements of UPS EN62040-3/IEC62040-3
Note: The product standards in this table incorporate relevant compliance clauses with generic IEC and EN standards for safety
(IEC/EN60950), electromagnetic emission and immunity (IEC/EN61000 series), and construction (IEC/EN60146 series and 60529)
8.2 Environmental Characteristics
Table 8-2 Environmental Characteristics
Item Unit
Rated power (kVA)
30 40 60
Noise within 1 m (from the front) dBA 52 54 59
Altitude m
≤
1000, derate power by 1% per 100 m between 1000 m and 2000 m
Relative humidity %RH 0 to 95, non condensing
Operating temperature
°C
0 to 40; battery life is halved for every 10°C increase above 20°C
Storage and transport temperature for UPS
°C
-20 to 70
Recommended battery storage temperature
°C
-20 to 30 (20
°C for optimum battery storage
)
Overvoltage level Overvoltage level 2
Pollution level Pollution level 2
8.3 Mechanical Characteristics
Table 8-3 Mechanical Characteristics
Item Unit
Rated power (kVA)
30 40 60
Dimensions (W × D × H) mm 600
× 843× 16
00
Weight (excluding battery) kg 230 260 260
Weight (including battery) kg 590 630 630
Color Black ZP7021
Protection degree, IEC(60529) IP20 (front door open or closed)
Page 58
58 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Product Specifications
8.4 Electrical Characteristics (Input Rectifier)
Table 8-4 Rectifier AC Input (Mains)
Item Unit
Rated power (kVA)
30 40 60
Rated AC input voltage 1 Vac 380/400/415 (3-phase and sharing neutral with the bypass input)
Input voltage range 2 Vac 228 to 477
Frequency 2 Hz 50/60 (tolerance: 40 Hz to 70 Hz)
Power factor kW / kVA, full load (half load) 0.99 (0.98)
Input power kVA rated 3 (maximum 4) 32 (36) 42 (51) 63.5 (72.5)
Input current A rated
3
(maximum 4) 46 (53) 61 (75) 92 (106)
Harmonic current distortion THDI% FL 5
Duration of progressive power
walk-in
sec
5 sec to reach full rated current
(selectable 1 sec through 5 sec in 1-second intervals)
Note:
1. Rectifiers operate at any of the rated supply voltages and frequencies without further adjustment.
2. At 305 V mains input, the UPS maintains the specified output voltage at rated load without discharging a previously charged battery.
3. IEC62040-3/EN50091-3: At rated load and input voltage 400 V, battery charged.
4. IEC62040-3/EN50091-3: At rated load and input voltage 400 V, battery charging at maximum rated power
8.5 Electrical Characteristics (Intermediate DC Circuit)
Table 8-5 Battery
Item Unit
Rated power (kVA)
30 40 60
Battery bus voltage Vdc Nominal: 384 (VRLA float charge is 436 V); range: 300 to 576
Quantity of lead-acid blocks
Nominal 32 = [1 block (12 V)]
Maximum 40 = [1 block (12 V)]
Minimum 30 = [1 block (12 V)]
Float voltage V/cell (VRLA)
2.27 (selectable between 2.2 V/cell and 2.3 V/cell)
Constant current and constant voltage charge mode
Temperature compensation
mV/°C/cl
3 (selectable between 0 and 5
mV/°C/cell
, or inhibit)
Temperature compensation
central point
°C 25 (selectable between 20 and 30°C)
Ripple voltage % V float
≤
1
Ripple current % C10
≤
5
Boost voltage V/cell (VRLA)
2.35 (selectable between 2.3 V/cell and 2.4 V/cell)
Constant current and constant voltage charge mode
Programmable automatic trigger or inhibit of boost mode
Boost control
Float-boost current trigger 0.050 C
10
(selectable between 0.001 and 0.070)
Boost-float current trigger 0.010 C
10
(selectable between 0.001 and 0.025)
24 h safety time timeout (selectable between 8 h and 30 h)
Boost mode inhibit also selectable
EOD voltage
V/cell (VRLA)
Lower limit: 1.63 (selectable between 1.60 V/cell and 1.67 V/cell)
Upper limit: 1.75 (selectable between 1.67 V/cell and 1.85 V/cell)
Battery charging power
1
and max charging current
(adjustable)
2
kW 4.5 6 (9) 9
A 11 14.7 (22) 22
Note:
1. At low input voltage the UPS recharge capability increases as the load decreases (up to the maximum capacity indicated).
2. Max currents listed are for EOD voltage of 1.67 V/cell for 240 cells
Page 59
User Manual 10H52192UM60 - Rev. 1 - 09/2011 59
Product Specifications Liebert NX
8.6 Electrical Characteristics (Inverter Output)
Table 8-6 Inverter Output (to Critical Load)
Item Unit
Rated power (kVA)
30 40 60
Rated AC voltage 1 Vac 380/400/415 (three-phase five-wire, with neutral reference to the bypass neutral)
Frequency 2 Hz 50/60
Overload
long time %
100 – 105
60 min %
105 – 110
10 min %
110 – 125
1 min %
125 – 150
< 200 ms % > 150
Fault current
(current limitation for max. 200 ms)
% 310 465 310
Non-linear load capability 3 % 100
Neutral current capability % 170
Steady state voltage stability %
± 1
Transient voltage response 4 %
± 5
Total harmonic voltage % <1 (linear load), <4 (non-linear load 3)
Synchronization window Hz
Rated frequency ±5
Slew rate (max change rate of
synchronization frequency)
Hz/s 1; setting range: 0.1 to 3 (single unit), 0.2 (parallel system)
Note:
1. Factory default set to 400 V. 380 V or 415 V selectable by commissioning engineer.
2. Factory default set to 50 Hz. 60 Hz selectable by commissioning engineer. Note that the system frequency can be changed only when
the UPS is on bypass. It is strictly prohibited to change the system frequency when the UPS is on inverter.
3. IEC 62040-3, annex E (crest factor 3:1).
4. IEC 62040-3 also for 0% - 100% - 0% load transient. Transient recovery time: return to within 5% of steady state output voltage within
half a cycle.
8.7 Electrical Characteristics (Bypass Input)
Table 8-7 Bypass Input
Item Unit
Rated power (kVA)
30 to 60
Rated AC voltage
1
Vac
380/400/415, three-phase five-wire, sharing neutral with the rectifier input and
providing neutral reference to the output
Rated
current
380V
400V
415V
A 225
A 215
A 205
Upstream protection, bypass
line
N/A
Thermomagnetic circuit breaker, rated up to 125% of nominal output current.
IEC 60947-2 curve C.
Current rating of neutral cable A 1.7 × In
Frequency 2 Hz 50/60
Transfer time (between
bypass and inverter)
ms
Synchronous transfer: ≤1
Asynchronous transfer (default): 15 (50Hz), 13.3 (60Hz); or 40, 60, 80, 100 selectable
Bypass voltage tolerance %Vac
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)
Bypass frequency tolerance %
±10 or ±20; default: ±10
Synchronization window Hz Rated frequency ±5
Note:
1. Factory default set to 400 V. 380 V or 415 V selectable by commissioning engineer.
2. Factory default set to 50 Hz. 60 Hz selectable by commissioning engineer.
Page 60
60 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Product Specifications
8.8 Efficiency, Heat Losses and Air Exchange
Table 8-8 Efficiency, Heat Losses and Air Exchange
Item Unit
Rated power (kVA)
30 40 60
Overall efficiency
Normal mode (double-conversion) % > 95
Inverter efficiency (DC/AC) (battery at nominal voltage 432 Vdc and full-rated linear load)
Battery mode % 95
Heat losses & air exchange
Normal mode kW 1.5 1.8 2.9
No load kW 0.3 0.6 0.6
Maximum forced air cooling (front
intake, rear exhaust)
L/sec 112 192 192
Note: 400 Vac input and output, battery fully charged, full-rated linear load
Page 61
User Manual 10H52192UM60 - Rev. 1 - 09/2011 61
Transformer Version Liebert NX
Chapter 9 Transformer Versions
9.1 Input Transformer Version
This UPS can be supplied with an insulating transformer at the UPS input. This transformer is installed in place of the batteries and
provides electrical insulation between the load and the input mains utility.
Figure 9-1 UPS with Input Insulating Transformer
Page 62
62 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Transformer Versions
9.2 Output Transformer Version
This UPS can be supplied with an insulating transformer at the UPS output. This transformer is installed in place of the batteries and
provides electrical insulation between the UPS output and the load.
Figure 9-2 UPS with Output Insulating Transformer
Page 63
User Manual 10H52192UM60 - Rev. 1 - 09/2011 63
Appendix 1 Option List Liebert NX
Appendix 1 Option List
Table 1 Option List
Option Part Numbe
r
Comment
Relay card IS-Relay
Web Card IS-WEBL
T
o be installed in intellislot port 2 (first choice) or 3
Modbus card IS-485L
T
o be installed in intellislot port 2 (first choice) or 3
V
elocity Pass trought card IS-485EXI
T
o be installed in intellislot port 2 (first choice) or 3
Parallel or Dual Bus Connection Cable (5m) 10H54910P15
Parallel or Dual Bus Connection Cable (10m) 10H54910P01
Parallel or Dual Bus Connection Cable (16m) 10H54910P08
BATTERY CABINET - 5Y:2X32X26Ah LI66150MM340AA0
BATTERY CABINET - 10Y :2X32X26Ah LI66160MM340AA0
EMPTY BATTERY CABINET LI66610MA000AA0
BATTERY SHELF KIT FOR INTERNAL BATTERY 10B14698GPK1
Page 64
Liebert NX Appendix 2 Abbreviations
64 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Appendix 2 Abbreviations
AC Alternating current
BCB Battery circuit breaker
CSA Cross sectional area
CT Center tap
DC Direct current
DSP Digital signal processor
EMC Electromagnetic compatibility
EOD End-of-discharge
EPO Emergency power off
LCD Liquid crystal display
LBS Load bus synchronizer
MCCB Moulded-case circuit breaker
PE Protective earth
PWM Pulse width modulation
RCCB Residual current circuit breaker
RCD Residual current detector
RFI Radio frequency interference
SCR Silicon-controlled rectifier
STS Static transfer switch
UPS Uninterruptible power system
VRLA Valve-regulated lead-acid
Loading...