Liebert NX 30 kVA User manual

Brand: Liebert

Model: NX 30 kVA

Category: Uninterruptible power supplies (UPSs)

Type: User manual

This manual is also suitable for

Liebert NX 30/40/60kVA

UNINTERRUPTIBLE POWER SUPPLY

USER MANUAL

10H52192UM60 - Rev. 1

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.

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

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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 S ystems ................................................................................................................................ 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

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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

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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

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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

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.

Do not apply electrical power to the UPS without the permission of the commissioning engineer.

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.

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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.

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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.

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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.

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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.

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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).

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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

，

with full battery recharge

Output current

at full

load

Battery discharge

current at EOD

(32 blocks)

Main input, output,

bypass input cables

Battery cables

380V 400V 415V 380V 400V 415V Bolt

Torq ue

(Nm)

Bolt

Torq 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

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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.

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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.

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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.

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

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 mm

1.5 mm

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

+12V

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.

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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

GND

DRV

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

GND

DRV

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

EXT_Q3

IN_S

GND

EXT_OUT

Figure 1-9 Maintenance Switch and Output Switch State Port

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.

BFP_C

BFP_S

BFP_O

Figure 1-10 Output Dry 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

EPO_NC

Figure 1-11 Remote EPO Input Port

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.

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Liebert NX 30 kVA User manual

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Model: NX 30 kVA

Category: Uninterruptible power supplies (UPSs)

Type: User manual

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