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Liebert NXC 10/15/20kVA
UNINTERRUPTIBLE POWER SUPPLY
USER MANUAL
10H52188UM51 - rev. 1
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2 User Manual 10H52188UM51 - Rev. 1 - 09/2011
Liebert NXC
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.
Liebert NXC may differ from the one displayed on the
front cover.
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User Manual 10H52188UM51 - Rev. 1 - 09/2011 3
Liebert NXC Contents
Contents
CHAPTER 1 PRODUCT INTRODUCTION ......................................................................................................................... 5
1.1 Features ........................................................................................................................................................................ 5
1.2 Model Configurations ................................................................................................................................................... 5
1.3 Appearance And Components ...................................................................................................................................... 6
1.3.1 Appearance ................................................................................................................................................................................ 6
1.3.2 Components .............................................................................................................................................................................. 6
1.4 Operating Principle ....................................................................................................................................................... 7
1.5 UPS State And Operation Mode .................................................................................................................................... 8
1.5.2 Normal Mode ............................................................................................................................................................................. 9
1.5.3 Bypass Mode .............................................................................................................................................................................. 9
1.5.4 Battery Mode.............................................................................................................................................................................. 9
1.5.5 ECO Mode (For Single UPS System Only) .................................................................................................................................... 9
1.5.6 FRC (Frequency Converter) Mode .............................................................................................................................................. 9
1.5.7 Fault State .................................................................................................................................................................................. 9
1.5.8 Maintenance Bypass Mode ....................................................................................................................................................... 10
1.6 Specifications ............................................................................................................................................................. 10
CHAPTER 2 SINGLE UPS INSTALLATION AND COMMISSIONING ............................................................................. 12
2.1 Unpacking Inspection ................................................................................................................................................. 12
2.2 Installation Preparation ............................................................................................................................................... 12
2.2.2 Location ................................................................................................................................................................................... 13
2.2.3 Environmental Requirement .................................................................................................................................................... 13
2.2.4 Installation Tools ...................................................................................................................................................................... 14
2.3 External Protective Device .......................................................................................................................................... 14
2.3.1 Rectifier And Bypass Input ........................................................................................................................................................ 14
2.3.2 Battery Input (for external Battery) .......................................................................................................................................... 15
2.4 Connecting Power Cables ........................................................................................................................................... 15
2.4.1 Connecting I/O Cables .............................................................................................................................................................. 17
2.4.2 Connecting and Installing External Battery ............................................................................................................................... 22
2.5 Single UPS Commissioning ......................................................................................................................................... 23
2.5.1 Check Before Power-On ........................................................................................................................................................... 23
2.5.2 Single UPS Parameters Setting ................................................................................................................................................. 23
2.5.3 Normal Mode Start-Up ............................................................................................................................................................. 26
2.5.4 Battery Mode Start-Up ............................................................................................................................................................. 26
CHAPTER 3 PARALLEL UPS INSTALLATION AND COMMISSIONING ....................................................................... 27
3.1 Features ...................................................................................................................................................................... 27
3.2 Requirements ............................................................................................................................................................. 27
3.3 Connecting Power Cables ........................................................................................................................................... 27
3.3.1 Connecitng I/O Cables .............................................................................................................................................................. 28
3.3.2 Connecting Parallel Cables ....................................................................................................................................................... 28
3.3.3 Connecting external Battery Cables ......................................................................................................................................... 30
3.4 Commissioning Parallel System .................................................................................................................................. 32
3.4.1 Check Before Power-On ........................................................................................................................................................... 32
3.4.2 Parallel System Parameters Setting .......................................................................................................................................... 32
3.4.3 Power-On Commissioning For Parallel System ......................................................................................................................... 33
3.5 Installation And Commissioning For Double Bus System with common neutral .......................................................... 34
3.5.1 Introduction ............................................................................................................................................................................. 34
3.5.2 Installing External Protective Device ........................................................................................................................................ 35
3.5.3 Connecting Power Cables ........................................................................................................................................................ 35
3.5.4 Connecting LBS Cables ............................................................................................................................................................. 35
3.5.5 Setting Parameters Of Double Bus System ............................................................................................................................... 37
CHAPTER 4 OPERATION AND DISPLAY PANEL .......................................................................................................... 38
4.1 Introduction ............................................................................................................................................................... 38
4.1.1 LED Indicators .......................................................................................................................................................................... 38
4.1.2 Audible Alarm (Buzzer) ............................................................................................................................................................. 38
4.1.3 Control Buttons ........................................................................................................................................................................ 39
4.1.4 LCD And Menu Buttons ............................................................................................................................................................ 39
4.2 LCD Screen Types ....................................................................................................................................................... 39
4.2.1 Start Screen .............................................................................................................................................................................. 39
4.2.2 Primary Screen ......................................................................................................................................................................... 40
4.2.3 Default Screen .......................................................................................................................................................................... 40
4.3 Detailed Description Of Menu Items ........................................................................................................................... 41
4.4 Prompt Window ......................................................................................................................................................... 43
4.5 UPS Alarm Message List .............................................................................................................................................. 43
CHAPTER 5 UPS OPERATION INSTRUCTIONS ............................................................................................................ 46
5.1 UPS Start-Up ............................................................................................................................................................... 46
5.2 Transfer Procedures Between Operation Modes ......................................................................................................... 46
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Contents Liebert NXC
5.2.1 Transfer From Normal Mode To Battery Mode ......................................................................................................................... 46
5.2.2 Transfer From Inverter Mode To Bypass Mode ......................................................................................................................... 46
5.2.3 Transfer From Bypass Mode To Inverter Mode ......................................................................................................................... 46
5.2.4 Transfer From Inverter Mode To Maintenance Bypass Mode .................................................................................................... 46
5.2.5 Transfer From Maintenance Bypass Mode To Inverter Mode .................................................................................................... 47
5.3 UPS Complete Shutdown ............................................................................................................................................ 48
5.4 EPO ............................................................................................................................................................................. 48
5.5 Auto Restart ............................................................................................................................................................... 48
5.6 UPS Reset ................................................................................................................................................................... 48
5.7 Language Selection .................................................................................................................................................... 49
5.8 Changing Current Date And Time ............................................................................................................................... 49
5.9 Control Password ....................................................................................................................................................... 49
CHAPTER 6 COMMUNICATION...................................................................................................................................... 50
6.1 Installing Intellislot cards ............................................................................................................................................ 50
6.1.1 Intellislot cards Port ................................................................................................................................................................. 50
6.2 Connection Cables For Dry Contact Port ..................................................................................................................... 50
6.3 Connecting USB Communication Cables .................................................................................................................... 52
CHAPTER 7 MAINTENANCE .......................................................................................................................................... 53
7.1 Fan Maintenance ........................................................................................................................................................ 53
7.2 Battery Maintenance .................................................................................................................................................. 53
7.3 Cleaning UPS .............................................................................................................................................................. 54
7.4 Checking UPS State .................................................................................................................................................... 54
7.5 Checking UPS Functions ............................................................................................................................................. 54
CHAPTER 8 OPTIONS ..................................................................................................................................................... 55
8.1 Option list ................................................................................................................................................................... 55
8.2 Communication Cables .............................................................................................................................................. 55
8.3 Battery Cabinet ........................................................................................................................................................... 55
8.4 Liebert NXC Input Transformer Version ...................................................................................................................... 56
8.5 Liebert NXC Output Transformer Version ................................................................................................................... 56
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Liebert NXC Product Introduction
Chapter 1 Product Introduction
Liebert NXC UPS (UPS for short) is an intelligent online UPS system with sine wave output developed by Emerson Network
Power. The UPS offers reliable and high quality AC power to the precision instrument.
The UPS is applicable to supplying AC power to small scale computer centre, network, communication system, automatic
control system and precision instrument.
This chapter introduces the features, model configurations, appearance and components, operating principle, UPS state and
operation mode, and specifications of the UPS.
1.1 Features
The UPS features include:
Compatible with two modes: 3-phase mains output and single-phase mains output. The system wiring must be checked
and the panel setting must be conducted manually
Capable of parallel connection to achieve up to 3 + 1 parallel redundant power
High-frequency double conversion topology structure, with high input power factor, wide input voltage range, and
output immune to grid interference, thus adaptable to areas with unstable mains supply
High power density
Full digital control technology based on digital signal processor (DSP) to achieve high system reliability with
self-protection and fault diagnosis functions
Intelligent battery management to extend the batter y life
Operation and display panel with both LCD and LED indication to help you learn about the system operation state and
operating parameters
Capable of ECO power supply mode, which helps you save energy to the maximum extent
Flexible network management with Emerson monitoring software
Fan fault self-test and automatic recognition functions
SNMP card optional, providing network communication function
Capable of connecting multiple battery strings, extending the power supply time of battery mode
1.2 Model Configurations
Three rated power types are available for Liebert NXC UPS: 10kVA, 15kVA and 20kVA.
The model configurations are shown in Table 1-1.
Table 1-1 Model configurations
Typ e Des criptio n
LI6010… (10kVA)
For single UPS system, for 1 + 1 parallel system and above 1 + 1 parallel system,
the external battery cabinet with big capacity is recommended
LI6015… (15kVA)
LI6020… (20kVA)
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1.3 Appearance And Components
1.3.1 Appearance
The UPS device appearance is shown in Figure 1-1.
Front view Rear view
Figure 1-1 UPS appearance
1.3.2 Components
UPS module front panel
As shown in Figure 1-2, the UPS module front panel provides ventilation holes, operation and display panel, LED indicators, DIP
switch and battery cold start button.
Figure 1-2 UPS module front panel
Ventilation hole
Operation and display panel
LED indicator
DIP switch and battery
cold start button (with
protective cover)
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Liebert NXC Product Introduction
UPS module rear panel
As shown in Figure 1-3, the UPS module rear panel provides parallel ports, Load Bus Synchronization ports, terminal block,
Intellislot cards port, dry contact ports, USB port and ventilation holes. The SIC-SNMP card in the Intellislot cards port is optional,
it is sold separately.
Figure 1-3 UPS module rear panel
Figure 1-4 show the location of user I/O connectors
Figure 1-5
Note
Non-authorized personnel are prohibited from opening the UPS chassis cover.
1.4 Operating Principle
The operating principle of the UPS is shown in Figure 1-6.
Figure 1-6 UPS operating principle
1. The UPS is composed of mains input (mains and bypass), I/O filter, rectifier/PFC, charger, inverter, bypass, battery, DSP
controller, System Control Power and UPS output.
2. When the mains is normal, the rectifier will start, and the charger will charge the battery string. Before turning on the UPS,
the output voltage is the bypass voltage, and the mains supplies power to the load through the bypass. After turning on the UPS,
the inverter output is connected to the load, and the mains supplies DC power to the inverter through the rectifier/PFC circuit.
The inverter then converts DC power into pure sine wave AC power, and supplies AC power to the load through the electronic
transfer switch.
3. When the mains is abnormal, the rectifier/PFC circuit boosts the battery voltage and supplies it to the inverter. The inverter
then converts it into pure sine wave AC power, and supplies AC power to the load through the electronic transfer switch.
4. After the mains returns to normal state, the UPS will automatically transfer from battery mode to Normal mode, the mains
supplies DC power to the inverter through the rectifier/PFC circuit, and then the electronic transfer switch supplies DC power to
the load.
Input filter
Bypass
Inverter
Output filter
Rect ifier/PF C
Auxiliary
p
ower
Charger
DSP
controller
Battery
Bypass input
Mains input
Output
Parallel port
LBS port
Intelligent card
port (with
protective cover)
Dry contact port
USB port
Ventilation hole
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Product Introduction Liebert NXC
1.5 UPS State And Operation Mode
The UPS state and operation mode include: Normal mode, Bypass mode, Battery mode, FRC (Frequency Converter) mode, ECO
mode, Fault state and Maintenance Bypass mode. The operation schematic diagrams of Normal mode, Bypass mode, Battery
mode, Maintenance Bypass mode ECO mode and FRC mode are shown in Figure 1-7.
Figure 1-7 Operation schematic diagram
For the LED indicators introduced in this section, refer to 4.1.1.
Bypass input
Mains input
Normal mode
Output
Bypass input
Mains input
Bypass mode
Output
Bypass input
Mains input
Battery mode
Output
Bypass input
Mains input
Maintenance
Bypass mode
Output
Bypass input
Mains input Output
ECO mode
Mains input Output
FRC mode
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Liebert NXC Product Introduction
1.5.2 Normal Mode
When the mains input is normal, the load is provided with voltage-stabilized and frequency- stabilized power by the inverter,
and meanwhile the battery is charged.
In Normal mode, the inverter indicators are on (green).
1.5.3 Bypass Mode
If the overload overtime, inverter or rectifier failure appears during the UPS operation in Normal mode, the UPS will transfer to
Bypass mode, that is, the load is powered by the bypass source, which comes directly from the mains input; if the rectifier is
normal, the internal charger will charge the battery. In Bypass mode, the inverter indicators are off.
Note
In the event of mains failure or mains voltage out of range in Bypass mode, the UPS will shut down and stop the output.
1.5.4 Battery Mode
Upon mains failure, rectifier overload or mains voltage out of range, the rectifier and internal charger will become inoperative,
and the battery will supply power to the load through the inverter. The inverter indicators are on together with buzzer alarming,
which notifies you that the UPS is in Battery mode.
Note
1. The battery has been fully charged before delivery. However, transportation and storage will inevitably cause some capacity loss.
Therefore, it is required to charge the battery for eight hours before putting the UPS into operation, so as to ensure the adequate
backup time for battery.
2. The battery cold start can also be used to start the UPS from the Battery (charged) mode upon mains failure. Therefore, the battery
power can be used independently for improving the system availability to some extent.
1.5.5 ECO Mode (For Single UPS System Only)
In ECO mode, the load is powered by bypass when the bypass voltage is normal, and the load is powered by inverter when the
bypass voltage is abnormal. ECO mode is an energy-saving operation mode. For power equipment insensitive to power grid
quality, you can use the ECO mode for power supply through bypass to reduce the power loss.
Note
1. In ECO mode, if the bypass failure or abnormal bypass voltage appears when the output is not overloaded, the UPS will transfer to
Normal mode. However, if the bypass failure or abnormal bypass voltage appears when the output is overloaded, the UPS will not
transfer to Normal mode, but shut down the bypass.
2. In ECO mode, the efficiency of the UPS is up to 98%.
1.5.6 FRC (Frequency Converter) Mode
This mode can be used for mains and load with different frequencies (60/50Hz or 50/60Hz).
1.5.7 Fault State
In Normal mode, the UPS will transfer to Bypass mode if the inverter failure or UPS overtemperature appears. In Battery mode
(with no bypass mains), the UPS will shut down and stop the output if the inverter failure or UPS overtemperature appears. In
Fault state, the fault indicators will turn on, the buzzer will keep beeping, and the corresponding fault information will be
displayed on LCD.
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1.5.8 Maintenance Bypass Mode
If the maintenance and repair for UPS is needed, you can switch the load to the Maintenance Bypass through maintenance
bypass MCB, and the power to the load is uninterrupted. The maintenance bypass Miniature Circuit Breaker is located on the
rear panel of the UPS device, and the capacity meets the requirements of total load capacities.
Note
When the UPS has malfunctions and can not working normally, please get in touch with the nearest Emerson branch office or local
service centre. It is prohibited to repaire by yourself, otherwise the personnel injury and damage to the equipment will occur.
1.6 Specifications
The specifications are listed in Table 1-2.
Table 1-2 Specifications
Item
Specifications
LI6010… (10kVA) LI6015... (15kVA) LI6020… (20kVA)
Input
Rated voltage 380Vac/400Vac/415Vac; default 400Vac
Voltage range
304Vac ~ 478Vac, at full load
228Vac ~ 304Vac, linear derating
228Vac, at half load
Rated frequency 50Hz/60Hz; default 50Hz
Frequency range 40Hz ~ 70Hz
Power factor
≥
0.99, at full load; ≥ 0.98, at half load
Output
Rated power 9kW 13.5kW 18kW
Vol tage
3-in 3-out: 230Vac ± 1%, 3-phase balance load
3-in 1-out: 230Vac ± 1%
Frequency synchronization range Rated frequency ±8%Hz
Frequency track rate 0.6Hz/s (single UPS), 0.2Hz/s (parallel system)
Rated power factor 0.9
Crest factor 3:1
Voltage harmonic distortion < 2% (linear load), < 5% (non-linear load)
Dynamic response recovery time 60ms
Overload capacity
At 25°C: 105% ~ 125%, 5min
125% ~ 150%, 1min
Bypass voltage
Upper limit: +10%, +15% or +20%; default: +15%
Lower limit: -10%, -20%, -30% or -40%; default: -20%
Mains efficiency > 93%, up to 94%
Battery
Type Sealed, lead-acid, maintenance-free battery
Block(12V) No. Per positive and negative string: 30, 32, 34, 36, 38, 40; default: 32
Rated voltage 360Vdc ~ 480Vdc
Charge power
4.5kW, 0°C ~ 30°C
4.05kW, 30°C ~ 35°C
3.6kW, 35°C ~ 40°C
Adjust automatically according to the ambient temperature
Tra ns fe r
time
Mains←→Battery
0ms
Inverter←→Bypass
Synchronous transfer: ≤ 1ms
Asynchronous transfer (default): ≤ 20ms
Or 40ms, 60ms, 80ms and 100ms are available
Noise
≤
58dB
Panel display mode LED and LCD
Safety IEC/EN 62040-1:2008
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Liebert NXC Product Introduction
Item
Specifications
LI6010… (10kVA) LI6015... (15kVA) LI6020… (20kVA)
EMC
Conduction emission IEC/EN 62040-2
Immunity I
≤
16A, IEC/EN 61000-3-3; 16A < I ≤ 75A, IEC/EN 61000-3-11
Harmonic current I ≤ 16A, IEC/EN 61000-3-2; 16A < I ≤ 75A, IEC/EN 61000-3-12
Surge protection
IEC/EN 61000-4-5, endurance level 4 (4kV) (live line to earth),
level 3 (2kV) (during live lines)
Protection level IP20
Ambient
condition
Operating temperature 0°C ~ 40°C
Storage temperature
-40°C ~ +70°C (battery excluded); -20°C ~ +55°C (battery
included)
Relative humidity 5%RH ~ 95%RH, non-condensing
Altitude
< 2000m; derating according to GB/T3859.2 when higher than
2000m
Size W × H × D 500mm × 1240mm × 860mm
Weigh t
Net weight
215kg with Battery 32 Blocks
315kg with Battery 64 Blocks
415kg with Battery 96 Blocks
520kg with Battery 128 Blocks
115kg without Battery
Gross weight
245kg with Battery 32 Blocks
345kg with Battery 64 Blocks
445kg with Battery 96 Blocks
550kg with Battery 128 Blocks
145kg without Battery
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Single UPS Installation and Commissioning Liebert NXC
Chapter 2 Single UPS Installation And Commissioning
This chapter introduces the installation, cable connection and commissioning of the single UPS.
Each site has its peculiarity, so this chapter provides the guidance with general installation procedures and methods for the
installation engineer, who should conduct the installation according to the actual conditions.
Warning: professional installation
The UPS should be installed by a qualified engineer according to the information contained in this chapter. If any problem is found,
please get in touch with Emerson local service centre immediately.
The UPS shall not be powered on without approval of the commissioning engineer.
For other equipments which are not introduced in this manual, the detailed information about mechanical installation and electrical
installation are delivered with the equipment.
Note: 3-phase 5-line for power input
The UPS can be connected to 3-phase 5-line (L1, L2, L3, N, PE) TN, TT and IT AC power distribution system (IEC/EN 60364-3).
2.1 Unpacking Inspection
After the UPS arrival, you should unpack it and check the following items:
1. Visually inspect the UPS appearance for transportation damage. If any problem is found, please notify the carrier
immediately.
2. Check the accessories and models against the delivery list. If any problem is found, please notify the dealer immediately.
2.2 Installation Preparation
Prior to transportation, make sure of the height of the door enough and not other
obstacles standing in the passage. Refer to the following for dismantling of machine
cabinet.
Remove cover plate, side plates and fillings first.
Place dismantled cover plate on pallet sloped position, and then fix cover plate and
pallet with ironclads, so a slope form, push UPS along the slope.
Routine maintenance operations may involve removal of front and rear panels. Space
must be provided to permit the unit to be rolled back and forward.
Always install the Stabilizing Brackets to enhance the stabilizing of the UPS. If the UPS
needs to be moved after Stabilizing Brackets have been attached, the Brackets must be
removed.
To remove the Stabilizing Brackets, unscrew all the nuts and bolts holding it in place and slide it out from under the UPS.
When the UPS has reached its new position, push the Brackets into its down position again, and tighten the screws.
Brake Pad: with 19mm wrench in clockwise direction to screw the Brake Pads down to the ground, in this way to prevent the
UPS moving.
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2.2.2 Location
To extend the UPS life, the place chosen must offer:
The UPS must be installed vertically, on a level and even surface
Convenient wiring
Adequate operator access area
Adequate ventilation to meet the heat dissipation requirement
No corrosive gas, such as sulphur dioxide and so on
No excessive moisture or heat source
No excessive dust
Compliance with fire-fighting requirements
Operating temperature compliant with the specifications, see Table 1-2 for details
2.2.3 Environmental Requirement
UPS room
The UPS is designed for indoor installation, which should be installed in a clean and well-ventilated environment, so as to keep
the ambient temperature within the specifications.
The internal fans provide the forced air cooling for the UPS. Cooling air enters the UPS through the ventilation holes on the front
panel, and exhausts the hot air through the back ventilation holes. Therefore, do not obstruct the ventilation holes. Maintain at
least 200mm clearances between the front, rear, side panels of the UPS and the wall or adjacent equipment (see Figure 2-1), so
as not to obstruct the UPS ventilation and heat dissipation. Otherwise, the UPS internal temperature will rise, which will shorten
the UPS life.
If necessary, an indoor exhaust fan should be installed to keep the indoor temperature from rising. An air filter should be used
where the UPS is to operate in a dusty environment.
Figure 2-1 Installation clearances
Note
The UPS should be installed only on the concrete surface or other non-flammable surfaces.
Note: for exchanging the UPS
Power Module or the Battery
Tra y a fron t clea rance o
f
950mm is necessary.
50mm
50mm
General view
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UPS room (when Battery is integrated)
A small amount of hydrogen and oxygen will be generated at the end of battery charging, therefore, you must ensure that the
fresh air ventilation of battery installation environment meets the EN50272-2001 requirements.
The battery ambient temperature should be the constant temperature, for the ambient temperature is the main factor to affect
the battery capacity and life. The battery standard operating temperature is 20°C, operation above this temperature will
shorten the battery life, and operation below this temperature will reduce the battery capacity. If the battery average
temperature in operation rises from 20°C to 30°C, the battery life will be reduced by 50%; if the battery temperature in
operation exceeds 40°C, the battery life will be decreased exponentially. In general, the enabled ambient temperature of the
battery is 15°C ~ 25°C. The battery should be kept away from heat and ventilation holes.
When the UPS uses an external battery, you must install a battery protective device (such as fuse or circuit breaker) in areas near
the battery, and use the shortest wiring distance for the protective device and battery connection.
Storage
The UPS must be stored indoors, so as to be protected against the excessive moisture or overtemperature environment, when
the UPS does not need to be installed immediately. The battery requires dry and low temperature, well-ventilated environment
for storage, and the most suitable storage temperature is 20°C ~ 25°C.
Warning: battery hazards
During the battery storage, the battery must be periodically charged according to the battery instructions. You can connect the UPS to
the mains temporarily when charging the battery,
so as to charge the battery for battery activation
.
2.2.4 Installation Tools
Prepare installation tools according to Table 2-1. The tools must be insulated and ESD-proof processed prior to use.
Table 2-1 Installation tools list
Installation tool Specification Application
Cross screwdriver EJ5100mm Remove the screws of the terminal block cover, or open the chassis
Slotted screwdriver EJ375mm Connect I/O cables
Wire-pressure plier YT-12 Press wires for I/O terminal block
Diagonal plier MTC3C Make I/O cables
2.3 External Protective Device
The circuit breaker or other protective devices must be installed at the external AC input port of the UPS. This section provides
the general guidance for qualified installation engineer. The qualified installation engineer should learn about the local wiring
regulations for the equipment to be installed.
2.3.1 Rectifier And Bypass Input
Overcurrent
The appropriate overcurrent protective device should be installed on the mains input power distribution, and the current
capacity of power cable and the system overload requirements should be taken into account in installation (see Table 2-1). It is
recommended to use the thermo magnetic circuit breaker which satisfies with IEC/EN 60947-2 tripping curve C (normal) when
the current value reaches 125% of the current value listed in Table 2-2.
Split-bypass
When the system adopts split-bypass, separate protective devices should be installed at the mains input power distribution
respectively for the mains and bypass.
Main/Bypass backfeed protection
When using the main/bypass backfeed protection function, you need to install a protective device with auxiliary contact
function at the user’s gross mains input air breaker (including the main input and bypass input), and this auxiliary contact signal
should be connected to the system dry contact port.
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Note
1. The same neutral line must be used for the rectifier and bypass power.
2. For IT power grid system, the quadrupole protective device must be installed at the UPS external I/O power distribution.
Earth leakage current
The residual current detector (RCD) for the UPS upstream input power distribution should be:
Sensitive to the DC unidirectional pulse (level A) in power distribution network
Insensitive to the transient current pulse
General sensitivity type, settable: 0.3A ~ 1A
The residual current circuit breaker (RCCB) must be sensitive to the DC unidirectional pulse (level A) in power distribution
network, but insensitive to the transient current pulse, as shown in Figure 2-2 respectively.
Figure 2-2 RCCB symbols
When using the earth RCD in split-bypass system or parallel system, the RCD should be located at the upstream input power
distribution terminal to avoid generating the false alarm.
The earth leakage current introduced by the RFI filter in the UPS ranges from 3.5mA to 1000mA. It is recommended to confirm
the sensitivity of each differential device of the upstream input power distribution and downstream power distribution (to
load).
2.3.2 Battery Input (for external Battery)
The overcurrent protective device has been placed into the battery cabinet, when you choose the battery cabinet option
provided by Emerson. Otherwise, the external battery cabinet should provide DC compatible fused circuit breaker, so as to
provide the overcurrent protection for the UPS and its batteries.
2.4 Connecting Power Cables
I/O cables and battery cables are required for connection. When connecting the cables, you should follow the local wiring
regulations, take the environment situation into account, and refer to Table 3B of IEC/EN 60950-1. The max. current in different
operating modes is listed in Table 2-2, the recommended min. cable CSA is listed in Table 2-3. Select the appropriate cables
according to Table 2-2 and Table 2-3.
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Table 2-2 Max. steady state AC and DC current
UPS rated
power (kVA)
Rated current (A)
Mains input current
1, 2
upon battery
charging with max. ability
Gross output current
2
at full load
Battery discharging current
upon min. battery voltage
380V 400V 415V 380V 400V 415V
10 (3-in 3-out) 22 22 22 15 15 14
34
10 (3-in 1-out) 22 22 22 45 44 42 34
15 (3-in 3-out) 31 31 31 23 22 21 50
15 (3-in 1-out) 31 31 31 69 65 63 50
20 (3-in 3-out) 36 36 36 30 29 28 67
20 (3-in 1-out) 36 36 36 90 87 84 67
Note:
When selecting the battery cables, according to the current value shown in table, the max. allowable voltage drop is 4Vdc. Do not ring
the cables, so as to avoid increasing the electromagnetic interference (EMI).
1: The mains current input of the rectifier and bypass.
2: Non-linear load (switch mode power) affects the neutral cable design of output and bypass. The neutral cable current may exceed
the rated phase current, in general, 1.732 times as large as the rated current (not applicable, when 3-in 1-out mode)
Table 2-3 Single UPS cable CSA (unit: mm2, ambient temperature: 25°C）
Model
Input Output Bypass Neutral cable PE Battery
10kVA (3-in 3-out) 4 4 4 4 4 6
10kVA (3-in 1-out) 4 10 10 10 10 6
15kVA (3-in 3-out) 6 6 6 6 6 10
15kVA (3-in 1-out) 6 16 16 16 16 10
20kVA (3-in 3-out) 10 10 10 16 10 16
20KVA (3-in 1-out) 10 25 25 25 16 16
The recommended UPS I/O MCB capability is listed in Table 2-4, select the MCBs according to your requirements.
Note
The UPS is high leakage current equipment, it is not recommended to configure the MCB with leakage current protection function.
Table 2-4 UPS MCB selection
Model Input interface
Recommended capability of input
external MCB
Battery MCB
Output
interface
Main Bypass
10kVA (3-in 3-out) Terminal block 35A 35A DC 35A Terminal block
10kVA (3-in 1-out) Terminal block 35A 63A (1P) DC 35A Terminal block
15kVA (3-in 3-out) Teminal block 50A 50A DC 63A Terminal block
15kVA (3-in 1-out) Teminal block 50A 80A (1P) DC 63A Terminal block
20kVA (3-in 3-out) Teminal bock 63A 63A DC 80A Terminal block
20kVA (3-in 1-out) Teminal block 63A 125A (1P) DC 80A Terminal block
Note:
The 3-in 1-out MCB (125A) is used to connect the bypass input upon split-bypass configuration. The main MCB (63A) can be used
only upon common source configuration
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Liebert NXC Single UPS Installation and Commissioning
2.4.1 Connecting I/O Cables
The power cables of the UPS should be connected through the I/O terminal block located on the UPS rear panel. Figure 2-3
gives the terminal layout of the I/O terminal block.
Figure 2-3 Terminals layout of the I/O terminal block
Power distribution mode
According to the user’s requirements, the I/O cable connections can be configured into four types:
3-in 3-out, common source configuration (factory default),
3-in 3-out, split-bypass configuration,
3-in 1-out, common source configuration,
3-in 1-out, split-bypass configuration.
Self-distribution
The four I/O cable connection procedures of the self-distribution are as follows:
3-in 3-out, common source configuration (factory default)
1. Connect the live lines (input phase L1, input phase L2 and input phase L3), N line and PE line respectively to the I/O terminal
block (U1, V1, W1 and N1 and PE terminals) of the UPS.
Short connect U1 and U2, V1 and V2, W1 and W2 of the UPS I/O terminal block using the copper shorting bar 3 respectively
(factory default).
2. Connect the live lines (output phase L1, output phase L2 and output phase L3), N line and PE line respectively to the I/O
terminal block (U3, V3, W3 and N3 and PE terminals) of the UPS, as shown in Figure 2-4.
OUTPUT GND MAINS INPUT BYPASS INPUT EXT. BATTERY
BAT+
BAT-
BAT
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Figure 2-4 3-in 3-out, common source configuration cable connection
3-in 3-out, split-bypass configuration
1. Remove all the copper shorting bars 3 from the UPS I/O terminal block.
2. Connect the live lines (mains input phase L1, mains input phase L2 and mains input phase L3), N line and PE line respectively
to the I/O terminal block (U1, V1, W1 and N1 and PE terminals) of the UPS.
3. Connect the live lines (bypass input phase L1, bypass input phase L2 and bypass input phase L3) and N line respectively to the
I/O terminal block (U2, V2, W2 and N2 terminals) of the UPS.
4. Connect the live lines (output phase L1, output phase L2 and output phase L3), N line and PE line respectively to the I/O
terminal block (U3, V3, W3 and N3 terminals and PE terminal) of the UPS.
Copper shor ting bar s
No. 3
UPS MODULE
INTERNAL BATTERY
RECT
INV
CHARGER
COMMUNICATION
PORTS
OP. AND DISP.
PANE L
OUTPUT
MAINS INPUT
EXT. BATTERY
STS
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Liebert NXC Single UPS Installation and Commissioning
Figure 2-5 3-in 3-out, split-bypass configuration cable connection
3-in 1-out, common source configuration
Warning
The factory default of this UPS is 3-in 3-out, common source configuration. Change the power distribution mode of the UPS to 3-in
1-out according to the steps described in the following section Changing power distribution mode. Continue the following input and
output power cable connection and power-on commissioning after confirming that the change has been successful.
1. Confirm that the power distribution mode of the main UPS has been changed to 3-in 1-out according to the steps described
in the following section Changing power distribution mode.
2. As shown in Figure 2-6, paste the insulating film (accessory) on the copper shorting bar 10, and insert the buckles into the
corresponding holes on the copper shorting bar 10.
Assembling
Completed status
Insulating film
Copper shorting
Buckle
bar 10
Figure 2-6 Pasting the insulating film to the copper shorting bar 10
3. As shown in Figure 2-7, short connect U2, V2 and W2 terminals using the copper shorting bar 7, short connect the PE
terminals of the I/O terminal block of the UPS using the copper shorting bar 10 with insulating film, short connect U3, V3 and
W3 terminals using the copper shorting bar 5, short connect U1 and U2 terminals using the copper shorting bar 6, short
connect N1 and N2 terminals, and two N3 terminals using the two copper shorting bar 4.
UPS MODULE
INTERNAL BATTERY
RECT INV
CHARGER
COMMUNICATION
PORTS
OP. AND DISP.
PANE L
OUTPUT
MAINS INPUT EXT. BATTERY
STS
BYPASS INPUT
Buckle
Assembling
Insulating film
Completed status
Copper shorting
bar 10
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Figure 2-7 3-in 1-out, common source configuration cable connection
4. Connect the copper shorting bar 8 to one end of the copper shorting bar 7 (see Figure 2-7), and connect the live line (input
phase L1) to the copper shorting bar 8.
5. Connect the live lines (input phase L2 and input phase L3), N line and PE line respectively to the I/O terminal block (V1 and
W1 terminals) of the UPS, one screw hole of the copper shorting bar 4 with N1 and N2 terminals, and one screw hole of the
copper shorting bar 10.
6. Connect the output L line, N line and PE line respectively to the copper shorting bar 5, copper shorting bar 4 with two N3
terminals, and the other screw hole of the copper shorting bar 10.
3-in 1-out, split-bypass configuration
Warning
The factory default of this product is 3-in 3-out, common source configuration. Change the power distribution mode of the main UPS to
3-in 1-out according to the steps described in the following section Changing power distribution mode. Continue the following input
and output power cable connection and power-on commissioning after confirming that the change has been successful.
1. Confirm that the power distribution mode of the main UPS has been changed to 3-in 1-out according to the steps described
in the following section Changing power distribution mode.
2. As shown in Figure 2-6, paste the insulating film (accessory) on the copper shorting bar 10, and insert the buckles into the
corresponding holes on the copper shorting bar 10.
3. As shown in Figure 2-8, short connect the two PE terminals of the I/O terminal block of the UPS using the copper shorting bar
10 with insulating film, short connect U2, V2 and W2 terminals using the copper shorting bar 7, short connect U3, V3 and W3
terminals using the copper shorting bar 5, short connect N1 and N2 terminals, and two N3 terminals using the two copper
shorting bar 4.
Copper sh orting ba rs
No. 6 No. 7
UPS MODULE
INTERNAL BATTERY
RECT INV
CHARGER
COMMUNICATION
PORTS
OP. AND DISP.
PANE L
OUTPUT
MAINS INPUT
EXT. BATTERY
Copper sh orting ba rs
No. 5
No. 4
No. 8
No. 10
No. 4
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Liebert NXC Single UPS Installation and Commissioning
Figure 2-8 3-in 1-out, split-bypass configuration cable connection
4. Connect the live lines (input phase L1, L2 and input phase L3), N line and PE line respectively to the I/O terminal block (U1, V1
and W1 terminals) of the UPS, one screw hole of the copper shorting bar 4 with N1 and N2 terminals, and one screw hole of the
copper shorting bar 10.
5. Connect the copper shorting bar 8 to one end of the copper shorting bar 7 (see Figure 2-8), and connect the live line (bypass
input phase L) to the copper shorting bar 8.
6. Connect the bypass input N line to the copper shorting bar 4 with N1 and N2 terminals of the UPS I/O terminal block.
7. Connect the output L line, N line and PE line respectively to the copper shorting bar 5, copper shorting bar 4 with two N3
terminals, and the other screw hole of the copper shorting bar 10 of the UPS I/O terminal block.
Warning
Before the commissioning engineer arrival, if the load is not ready for accepting the power, please take good care of the safety
insulation located at the end of the output cable.
After the output cable connection, find the label shown in Figure 2-9 on the enclosure of the UPS and put a tick after “AC
OUTPUT” and “BYPASS INPUT” according to the actual situation for easy maintenance.
Figure 2-9 Label
Copper sh orting ba rs
No. 7
UPS MODULE
INTERNAL BATTERY
RECT
INV
CHARGER
COMMUNICATION
PORTS
OP. AND DISP.
PANE L
OUTPUT
MAINS INPUT
EXT. BATTERY
Copper sh orting ba rs
No. 5
BYPASS INPUT
No. 4
No. 8
No. 4
No. 10
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Changing power distribution mode
Note
This product is compatible with 3-in 3-out/3-in 1-out, factory default: 3-in 3-out. Change the format according to the following steps if
you need to change the power distribution mode.
From 3-in 3-out to 3-in 1-out
1. Remove all the copper shorting bars 3 shown in Figure 2-4 of the 3-in 3-out system; connect the main input cables only. It is
prohibited to connect the bypass input cables, output cables and battery cables, as shown in Figure 2-10.
Figure 2-10 Main input
2. Remove the EPO jumpers of the dry contact port 4 (see Figure 6-2 and Table 6-1).
3. Power on the system with LBS (Load Circuit Breaker) QS1. Set the system to ‘Single’ through the LCD menu ‘Settings’ -> ‘3
Phase Output or 1 Phase Output’ (default password: 12345), and power off the system completely, then power on the system
again, enter this menu to confirm the setting is valid.
4. Power off the system completely, and replace the EPO jumpers of the dry contact port 4, and remove the main input cable.
From 3-in 1-out, to 3-in 3-out
1. Remove all copper shorting bars shown in Figure 2-7 and Figure 2-8 of the 3-in 1-out system, connect the main input cables
only. It is prohibited to connect the bypass input cables, output cables and battery cables, as shown in Figure 2-10.
2. Remove the EPO jumpers of the dry contact port 4 (see Figure 6-2 and Table 6-1).
3. Power on the system. Set the system to ‘Three’ through the LCD menu ‘Settings’ -> ‘3 Phase Output or 1 Phase Output’
(default password: 12345), and power off the system completely, then power on the system again, enter this menu to confirm
the setting is valid.
4. Power off the system completely, replace the EPO jumpers of the dry contact port 4, and remove the main input cable.
2.4.2 Connecting and Installing External Battery
Notes
For the installation and commissioning of an external Battery, refer to “Liebert NXC Battery User Manual”.
to UPS Rectifier
I/O TERMINAL BLOCK
Mains input cables only!
BAT+ BAT-
BAT
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Liebert NXC Single UPS Installation and Commissioning
2.5 Single UPS Commissioning
2.5.1 Check Before Power-On
1. Check and confirm that the power distribution mode of the UPS is correct, that the connections of the power cable and signal
cable are correct and there is no short circuit.
2. When used an external Battery, check that the battery installation and the cable connection are correct, positive pole and
negative pole of the battery is correct.
3. Measure and confirm that the mains voltage and frequency are normal.
4. The output terminals of the UPS are energized upon the power-on. If the load is connected with the output terminals, make
sure that the power to the load is safe.
2.5.2 Single UPS Parameters Setting
Power on the UPS according to step 1 ~ step 4 in 2.5.3, it is prohibited to start the inverter.
Press the menu key to enter the function setting option, set the single UPS parameters according to Table 2-5.
Table 2-5 Single UPS parameters setting
Parameters Default value Parameters setting
Single Group Batt Cap 0014 Set the parameter according to the actual battery capicitity
Battery Cells Number 32 Set the parameter according to the actual battery number
Equalize Charge Allowed Enabled Set the parameter according to the actual battery charicteristic
System Configuration Single Single
ECO Mode Normal Normal
Output frencency level 50Hz Set the parameter according to the actual power grid, 50Hz/60Hz can be selected
Output voltage level 400V Set the parameter according to the actual power grid, 380V/400V/415V can be selected
3 Phase Output or 1 Phase
Output
Three Select “Three” when is 3 Phase Output, select ”Single” when is 1 Phase Output
Note: output frequency level and output voltage level will be active after power-off, but will not be displayed on LCD panel, the settings will be
valid after manual power-off.
The parameter descriptions and default values of the other parameters are listed in Table 2-6; you can set the parameters
according to the actual requirements.
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Table 2-6 Parameter descriptions and default values
Parameters Notes Default value
Display contrast Adjust the LCD contrast
Date format set M/D/Y, D/M/Y and Y/M/D formats can be selected Y/M/D
Date & time Set the date and time
Comm1 baud rate Set the communication baud rate of the USB port 9600
Comm2 baud rate For internal communication only, which cannot be set 9600
Comm3 baud rate Set the communication baud rate of the SNMP card port 9600
Communication address For RS485 communication 1
Single Group Batt Cap Set the parameter according to the actual total battery capicitity 0014
Battery Cells Number Set total battery number 32
Equalize Charge Allowed Enabled or disabled Enabled
Temp Compensation Enabled or disabled Disabled
Batt Temp Sensor Position Set the position of the temperature sensor NONE
Shared Battery Each UPS in parallel system shares the battery string or not Disabled
System Configuration Set the UPS single/parallel Single
Parallel Requisite Units Set the parallel units 1
Parallel Redundant units Set the redundant units 0
ECO Mode Working in the normal mode or ECO mode Normal
Output Frequency Level Set the output frequency 50Hz
Output Voltage Level Set the output voltage level 400V
LBS Function Set the LBS function, NONE, SLAVE or MASTER can be selected NONE
Command password 12345 12345
Protocol Set the UPS communication protocol Velocity
3 Phase Output or 1 Phase Output Set the output mode: Three or Single Three
Set “Display contrast”, “Date format set” and “Date & time” according to the actual requirements. For Comm1, Comm2 and
Comm3 baud rate, 1200, 2400, 4800, 9600 or 19200 can be selected. The interfaces are shown in Figure 2-11.
ITA 016kVA
Settings
Single
Date format set Y/M/D
D/M/Y M/D/Y Y/M/D
Date & Time
2010-08-13 15:12:06
ESC
Display contrast
14:30:36
ITA 016 kVA
Settings
Single
1
Single Group Batt Cap 0014
Battery Cells Number 32
ESC
1
Communication address
0014
30 32 34 36 38 40
14:30:36
Figure 2-11 Settings interface 1
NXC 20kVA
NXC 20kVA
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Liebert NXC Single UPS Installation and Commissioning
Set “Single Group Batt Cap” according to the actual total battery capacity, for “Battery Cells Number”, 30, 32, 34, 36, 38 or 40
can be selected, set “Equalize Charge Allowed”, “Temp Compensation” and “Batt Temp Sensor Position” (battery temperature
sensor is optional) according to the user requirement. The interfaces are shown in Figure 2-12.
ITA 016 kVA
Settings
Single
1
Single Group Batt Cap 0014
Battery Cells Number 32
ESC
1
Communication address
0014
30 32 34 36 38 40
14:30:36
ITA 016kVA
Settings
Single
Enabled Disabled
Temp Compensation Disabled
Enabled Disabled
Batt Temp Sensor Position NONE
INNER OUT NONE SIC
ESC
EnabledEqualize Charge Allowed
14:30:36
Figure 2-12 Settings interface 2
Note
The default value of “Battery Cells Number” is “32”, set the paramerter according to the atcual requirement.
Select “Enabled” in “Shared Battery” according to whether the battery is shared. Set “System Configuration” to “Single” if the
system is single system. Select “Normal” or “ECO” according to the UPS working mode, select “50Hz” or “60Hz” in “Output
Frequency Level” according to the power grid frequency level, as shown in Figure 2-13.
Settings
Single
Enabled Disabled
System Configuration Single
Parallel requisite units 4
ESC
Disabled
Shared Battery
1 2 3 4
Single Parallel
ITA 016 kVA
14:30:36
Settings
0 1 2 3
ECO Mode Normal
Output frequency level 50Hz
ESC
1
Parallel Redundant Units
Normal ECO
50Hz 60Hz
ITA 016kVA
14:30:36
Single
Figure 2-13 Settings interface 3
NXC 20kVA
NXC 20kVA
NXC 20kVA
NXC 20kVA
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Set “Output Voltage Level” and “LBS Function” according to the user requirement, set “Command password” to “12345”, the
default value of “Protocol” is “Velocity”, select “Three” or “Single” in “3 Phase Output or 1 Phase Output”, as shown in Figure
2-14.
ITA 016kVA
Settings
Single
200 208 220 230 380 400 415 480
LBS Function MASTER
Command password
ESC
380V
Output Voltage Level
NONE SLAVE MASTER
*****
14:30:36
ITA 016kVA
Settings
Single
YDN23 Velocity
3 Phase Output or 1 Phase Output Three
ESC
YDN23
Protocol
Three Single
14:30:36
Figure 2-14 Settings interface 3
2.5.3 Normal Mode Start-Up
1. Close the UPS output MCB (QS4), the input MCB (QS1) and the bypass MCB (QS2) on by one. The maintenance bypass MCB
(QS3) must be opened.
Warning
After closing the above mentioned MCBs, the UPS output terminal block of the load will be live, pay attention to the personnal safety
to avoid electric shock. Note whether it is safe to feed power to load.
2. LCD displays the self-test screen; the fault indicator (red) and inverter indicator (green) are on at the same time for about 5
seconds. After the self-test, UPS enters the bypass state, the fault indicator turns on and the buzzer beeps for 1 second.
3. The rectifier runs in normal state about 30 seconds, the rectifier start-up is finished.
4. Finish and check the parameter settings of the single UPS.
5. Press the ON button for 2 seconds, the inverter indicator (green) are blinking, the inverter starts, and the inverter indicator
turns on.
6. Measure whether the inverter output voltage is normal.
7. If the battery is not connected, the fault indicator is blinking. If the battery is connected (internal battery with MCB QS6 and
QS7), the fault indicator turns off.
2.5.4 Battery Mode Start-Up
1. Close the battery LBS; press the battery cold start button on the UPS front panel for 2 seconds, the LCD displays the start
screen. The fault indicator (red) will blink and the buzzer will beep continuously after the rectifier finish the start.
2. Press the ON button for 2 seconds, the inverter starts, and the inverter indicator (green) turns on.
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Chapter 3 Parallel UPS Installation And Commissioning
This chapter introduces the features, requirements, installation and commissioning of the parallel system.
The UPS parallel system provides the user with N + X (2 ≤ N + X ≤ 4) parallel configuration, N stands for the basic parallel sets, X
stands for the redundant sets.
3.1 Features
1. The software and the hardware of each UPS in parallel system are the same as those of the single UPS. The basic parameters
of the parallel system can be set through the LCD (Refer to 3.4.2 for the details), and the detailed parameters can be set
through the service software (For service engineers only). For all UPSs of the parallel system, the requirements of the parameter
settings are same.
2. The parallel cables form a ring connection (Refer to 3.3.2 for details) to provide reliability and redundancy for system. The
intelligent parallel logic provides the user with maximum flexibility. For example, the each UPS in the parallel system can be
switched off or on in random order; seamless transfer can be achieved between Normal mode and Bypass mode, and the
transfer is automatically recoverable: that is, after the overload condition is removed, the system will return to the original
operation mode automatically.
3. The total load of the parallel system can be queried through the LCD of each UPS.
3.2 Requirements
A UPS system composed of multiple parallel-connected UPS units is equivalent to a large UPS system. Nevertheless, it provides
increased system reliability. To ensure equal utilization of all UPS units and compliance with relevant wiring regulations, the
following requirements must be met:
1. All single UPSs must have the same capacity and must be connected to the same bypass source.
2. The bypass input power and rectifier input power must be connected to the same neutral line input terminal.
3. If a residual current detector (RCD) is required, it must be set correctly and installed before the same neutral line input
terminal, or it must monitor the protective earth current of the system. Refer to Safety Manual.
4. The outputs of all single UPSs must be connected to the same output bus.
5. As the UPS parallel system is not fitted with any auxiliary contact detection devices for the UPS unit output LBS (Load Break
Switch) or maintenance bypass LBS. Removing the single UPS from the parallel system before maintenance and adding the
single UPS into the parallel system after maintenance must be conducted strictly following the procedures provided in 5.2.
Failure to observe this may affect the load power supply reliability.
3.3 Connecting Power Cables
Each single UPS of the parallel system need to configure the MCB and cable respectively, refer to 2.4 for the specification.
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3.3.1 Connecitng I/O Cables
The UPS power cables are connected to the I/O terminal block of the UPS rear panel, the layout of the I/O terminal block is
shown in Figure 2-3.
Power distribution mode
The I/O cable connections are divided into four types: 3-in 3-out, common source configuration (factory default), 3-in 3-out,
split-bypass configuration, 3-in 1-out, common source configuration, 3-in 1-out, split-bypass configuration. The input and
output cable connection procedures of the four power distribution modes are as follows.
Distribution for the parallel system
The block diagram of three UPSs parallel system is shown in Figure 3-1. Refer to Power distribution mode in 2.4.1 for the cable
connection of each UPS. Refer to 2.4 for the input and output, battery MCB and cables when using the customer
self-distribution mode.
Figure 3-1 Block diagram of three UPSs parallel system
Warning
Each UPS must configure extenal input MCB and extenal output MCB when carring out the power distribution for the parallel
system, as shown in Figure 3-1.
Changing power distribution mode
This product is compatible with 3-in 3-out/3-in 1-out, factory default: 3-in 3-out.
Carry out the parallel connection after changing the single system to the needed system (refer to Changing power distribution
mode in 2.4.1 for the changing method), if you need to change the mode from 3-in 3-out to 3-in 1-out or from 3-in 1-out to
3-in 3-out.
3.3.2 Connecting Parallel Cables
The parallel system provides the parallel cable option. The parallel cables form a ring connection through the parallel ports on
the UPS rear panel. The cable connection schematic diagram of 3 + 1 parallel system is shown in Figure 3-2. The first port on the
left is DB9 male port (needle shape), and the second port on the left is DB9 female port (hole shape).
User input power
distribution unit
User output power
distribution unit
Input cable Output cable
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Liebert NXC Parallel UPS Installation and Commissioning
UPS 1
bCmCbBmBbAmAbNmNoN oN oA oB oC
PE PE
UPS 2
bCmCbBmBbAmAbNmNoN oN oA oB oC
PE PE
UPS 3
bCmCbBmBbAmAbNmNoN oN oA oB oC
PE PE
UPS 4
bCmCbBmBbAmAbNmNoN oN oA oB oC
PE PE
DB9 male port
DB9 female port
Figure 3-2 Cable connection schematic diagram of 3 + 1 parallel system
Note
1. The Emerson parallel cables must be used for the parallel system.
2. The parallel communication fault occurs when carrying out the parallel commissioning, check whether the connection of the
parallel cables is correct, and whenther the pin1~ pin9 are connected.
Setting parallel addresses
The parallel addresses for all UPSs in parallel system should be set. The parallel addresses can be set through the DIP switch on
the UPS front panel (see Figure 1-2). Remove the DIP switch cover, and set the DIP switch according to Table 3-1.
Table 3-1 DIP switch settings
Parallel addresses Parallel 1# Parallel 2# Parallel 3# Parallel 4#
DIP switch
position
ON
12345OFF
ON
12345OFF
ON
1 2345OFF
ON
12345OFF
Warning
1. The default setting for DIP switch is ‘1’. However, you should set the DIP switch position for the parallel system according to the
description listed in Table 3-1. Otherwise, the UPS fault will occur.
2. The parallel address must be unique for each UPS unit.
DB9 male port
DB9 female port
UPS 1
UPS 2
UPS 3
UPS 4
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3.3.3 Connecting external Battery Cables
All the UPSs in parallel system can either share the battery strings, or use battery strings independently.
Note
Each UPS should be equipped with the independent battery MCB. Refer to Table 2-4 for selection of the battery MCB.
Using battery string independently
When each UPS of the parallel system uses the battery string independently, the battery cables connection of each UPS in
parallel system is the same with that of the single UPS, refer to 2.4.2. The schematic diagram of battery strings in 1 + 1 parallel
system when using battery string independently is shown in Figure 3-3.
Note
Make sure that the LCD settings are correct when using the battery strings independently, refer to 3.4.2 for details.
Figure 3-3 Connection principle diagram upon using battery strings independently
Sharing battery string
Using the shared battery string in parallel system can save investment in equipment for users.
Note
To ensure the abundant backup time of the battery, it is recommended to use the external battery cabinet with big capacity.
1. Wiring
Power off the parallel system completely, disconnect the battery MCBs of all single UPSs, and then use battery cables (refer to
2.4 for the cables and the MCBs) to connect ‘+’, ‘N’, ‘-’ and ‘PE’ terminals of the battery string respectively to ‘Bat +’, ‘Bat N’,
‘Bat -’ and ‘PE’ terminals of the corresponding UPS I/O terminal block in parallel system through each battery MCB, as shown in
Figure 3-4.
first Block
second Block
third Block sixteen Block
UPS 1
first Block
second Block
third Block sixteen Block
first Block
second Block
third Block sixteen Block
UPS 2
first Block
second Block
third Block sixteen Block
Batter
y
strin
g
1 Batter
y
strin
g
2
Batter
y
strin
g
3 Batter
y
strin
g
4
output
output
p
arallel cable
Bat +
Bat N
Bat -
Bat +
Bat N
Bat -
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Liebert NXC Parallel UPS Installation and Commissioning
PE
UPS 1 UPS 2
UPS 1 MCB
UPS 2 MCB
＋－ PE
Positive batte ry
string
＋－ PE
Bat＋ Bat N Bat－ Bat＋ Bat N Bat－ PE
Negative battery string
Figure 3-4 Connection diagram of shared battery string in 1 + 1 parallel system
Refer to Figure 3-5 to configure the positive battery string and negative battery string
Figure 3-5 Internal connection diagram for positive battery string and negative battery string
2. Setting
Power on the system, set each single UPS to shared battery string configuration through the LCD menu ‘Settings’ -> ‘Shared
Battery’ from each UPS unit; set the LCD menu ‘Settings’ -> ‘Battery Cells Number’ and ‘Single Group Batt Cap’ from each UPS
unit, and each UPS unit setting must be the same, as shown in Figure 3-6.
Note
1. For the parallel system used the shared battery strings, make sure that the LCD settings are correct. Refer to 3.4.2 for details of the
settings.
2. For the parallel system used the shared battery strings, the ‘Single Group Batt Cap’ on the LCD setting of each UPS stands for the total
capacity of battery strings, and each UPS can calculate the battery capacity itself automatically.
UPS 1
UPS 1 MCB
UPS 2 MCB
UPS 2
Bat+ Bat N Bat- PE Bat+ Bat N Bat- PE
Positive battery
string
Negative battery string
first Block
second Block
third Block
sixteen Block
Battery string
Bat+
Bat-
PE
Battery cabinet
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ITA 016 kVA
Settings
Unit 1#
1
Single Group Batt Cap 0014
Battery Cells Number 32
ESC
1
Communication address
0014
30 32 34 36 38 40
14:30:36
ITA 016 kVA
Settings
Unit 1#
Enabled Disabled
System Configuration Parallel
Parallel requisite units 4
ESC
Disabled
Shared Battery
1 2 3 4
Single Parallel
14:30:36
Figure 3-6 Settings interface
3. Close the battery MCB of each UPS.
3.4 Commissioning Parallel System
3.4.1 Check Before Power-On
1. Check and confirm that the power distribution mode of the UPS is correct; that the connections of the power cable and signal
cable are correct and there is no short circuit.
2. Check that the battery installation and cable connection is correct and there is no short circuit, and that the positive pole and
negative pole of the battery is correct. Especially when each UPS of the parallel system shares battery string, check these items
carefully.
3. Check all the working status of the parallel system, ensure that the phase sequence of the mains, bypass and output of each
UPS is correct and consistent, that the parallel cable connection is reliable, and that the user load is not connected during
power-on.
4. Measure and confirm that the mains voltage and frequency is normal.
5. The output terminals of the UPS are energized upon the power-on. If the load is connected with the output terminals, make
sure that the power to the load is safe.
Warning
The UPS will be live upon the power-on. When the bypass of the single unit in the parallel system is not consistent, the system fault
may occur, check and confirm the bypass before power-on.
3.4.2 Parallel System Parameters Setting
The parallel parameters for all the UPS units in parallel system should be set.
Power ON the each UPS of the parallel system according to step 1) ~ step 4) in 3.4.3, it’s prohibited to start the inverter. Press
the menu key to enter the Settings option, set the parallel parameters according to Table 3-2.
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Liebert NXC Parallel UPS Installation and Commissioning
Table 3-2 Parallel parameters setting
Parameters Default value Parallel parameters setting
Single Group Batt Cap 0014 Set the parameter according to the actual battery capicitity
Battery Cells Number 32 Set the parameter according to the actual battery number
Equalize Charge Allowed Enabled Set the parameter according to the actual battery charicteristic
Shared Battery Disabled
Select “Enabled” if there is shared battery, select “Disabled” if there is no shared
battery
System Configuration Single Parallel
Parallel requisite units 1 Set the paramerter to “3” if there are four UPSs to form 3 + 1 parallel system
Parallel Redundant Units 0 Set the paramerter to “1” if there are four UPSs to form 3 + 1 parallel system
ECO Mode Normal Normal
Output frencency level 50Hz Set the parameter according to the actual power grid, 50Hz/60Hz can be selected
Output voltage level 400V
Set the parameter according to the actual power grid, 380V/400V/415V can be
selected
3 Phase Output or 1 Phase
Output
Three Select “Three” when is 3 Phase Output, select ”Single” when is 1 Phase Output
Note: output frequency level and output voltage level will be active after power-off, but will not be displayed on LCD panel, the
settings will be valid after manual power-off.
The default values of other parameters are listed in Table 2-5.
For the parallel system with N + X (2 ≤ N + X ≤ 4), set ‘System Configuration’ to ‘Parallel’, ‘Parallel requisite units’ to ‘N’ (1 ≤ N ≤
4), ‘Parallel Redundant Units’ to ‘X’ (0 ≤ X ≤ 3). Take the 3 + 1 parallel system for example, set ‘System Configuration’ to ‘Parallel’,
‘Parallel requisite units’ to ‘3’, ‘Parallel Redundant Units’ to ‘1’, as shown in Figure 3-7.
ITA 016 kVA
Settings
Unit 1#
Enabled Disabled
System Configuration Parallel
Parallel requisite units 3
ESC
Disabled
Shared Battery
1 2 3 4
Single Parallel
14:30:36
ITA 016kVA
Settings
Unit 1#
0 1 2 3
ECO Mode Normal
Output frequency Level 50Hz
ESC
1
Parallel Redundant Units
Normal ECO
50Hz 60Hz
14:30:36
Figure 3-7 Settings interface
3.4.3 Power-On Commissioning For Parallel System
Power on and commission each UPS of the parallel system respectively, namely power on one UPS each time, and other UPSs
are in the close status, the specific commissioning procedures are as follows:
1) Close the external output MCB and input MCB of one UPS, the UPS is powered on. Ensure that other UPSs MCBs are closed.
Close the corresponding internal input Output Circuit Breaker, bypass LBS and output LBS of the UPS.
Warning
After closing the UPS external output MCB and UPS internal output LBS, the UPS output terminal block, the distribution output
terminals and load will be live, pay attention to the personnal safety to avoid electric shock. Note whether it is safe to feed power to
load.
2) LCD displays the self-test screen; the fault indicator (red) and inverter indicator (green) are on at the same time for about 5
seconds. After the self-test, UPS enter the bypass mode, the fault indicator turns on and the buzzer beeps for 1 second.
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3) The rectifier runs in normal mode about 30 seconds, the rectifier start-up is finished.
4) Finish and check the parallel parameter settings.
5) Press the ON button for 2 seconds, the inverter indicator (green) are blinking, the inverter starts, and the inverter indicator
turns green.
6) If the battery is not connected, the fault indicator is blinking. If the battery is connected, the fault indicator turns off.
7) If the UPS is working normally, turn off the UPS.
8) Repeat the preceding step1) ~ setp7) to power on and commission the other UPSs respectively.
Note
Carry out the parallel commissioning after each UPS is working normally.
Confirm that each UPS has been powered on and working normally, commission the parallel system, the specific procedures are
as follows:
1) Close the external output MCB and input MCB and the corresponding UPS internal LBSs of one UPS. The UPS is powered on
and enters Bypass mode. The rectifier starts. Press the ON button for 2 seconds, the inverter indicator turns on. Measure
whether the inverter output voltage is normal.
2) Close the external output MCB and input MCB and the corresponding UPS internal LBSs of the second UPS. Follow the
preceding steps to start the inverter of the second UPS, check whether there is alarm on the LCD, and confirm that the UPS
parallel works normally.
3) Follow the methods to start up the inverter of the third or fourth UPS to connect the UPS into the parallel system.
Waring
During the parallel system power-on, confirm that the external output MCB of each UPS has been closed, and that all the inverter
output of the UPSs are connnted parallelly.
3.5 Installation And Commissioning For Double Bus System with common
neutral
3.5.1 Introduction
The double bus system consists of two independent UPS systems; each UPS system consists of one or two parallel-connected
single UPSs, or more parallel-connected single UPSs.
The double bus system has high reliability, which is suitable for the load with dual input terminals. For single UPS input load, you
can add a static transfer switch (STS, optional) to start the standard Load Bus Synchronization (LBS) system.
Place the UPSs side by side, and connect the UPSs as following:
The double bus system uses the LBS system to realize the output synchronization of the two independent (or parallel) UPS
systems. One is the master system, and the other is the slave system. The operation mode of the double bus system contains
master system and/or slave system running in normal mode or bypass mode. The schematic diagram of the LBS system built by
1 + 1 parallel system is shown in Figure 3-8.
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UPS 1
Bypass
Bypass input
Main input
UPS 2
UPS 3
UPS 4
Output
LBS cable
Parallel cable
Connect to load
STS
Bypass input
Main input
Main
Bypass
Main
Bypass
Main
Bypass
Main
Output
Output
Parallel cable
Output
Note: UPS1 and UPS2 are master system, UPS3 and UPS4 are slave system
Figure 3-8 LBS system schematic diagram
Note
For the DIP switch settings and the parallel commissioning, refer to 3.3.2 and 3.5 respectively.
3.5.2 Installing External Protective Device
See 2.3for details of installation and type selection.
3.5.3 Connecting Power Cables
In double bus system, refer to 2.4 and 3.3 to select the power cables for single UPS and parallel system respectively. The bypass
input power and mains input power must use the input terminal of the same neutral line. The leakage current protective device
should be installed before the input terminal.
3.5.4 Connecting LBS Cables
In double bus system, connect the two ends of the LBS cable to any LBS port of the two parallel systems respectively, as shown
in Figure 3-9. The third port on the left is DB9 male port (needle shape), the fourth port on the left is DB9 female (hole shape).
Note
1. The appearances of the LBS ports (see Figure 1-3) and the parallel ports (see Figure 1-3) are the same, but the positions are
different. Be careful when inserting and connecting to avoid incorrect connnection.
2. For the double bus system formed by parallel UPS, it is recommended to prepare two LBS cables, one is used to connect any of
the two LBS ports of the two parallel system, the other is redundant cable which is used for reliable connection.
3. As shown in Figure 3-9, one cable is LBS cable, others are parallel cables.
Bypass input
Main input
Bypass
Main
UPS 1
Bypass
Main
UPS 2
Bypass
Main
UPS 3
Bypass
Main
UPS 4
Bypass input
Main input
Output
Output
Output
Output
Parallel cable
Parallel cable
LBS cable
STS
Connect to load
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UPS 1
bCmCbBmBbAmAbNmNoN oN oA oB oC
PE PE
UPS 2
bCmCbBmBbAmAbNmNoN oN oA oB oC
PE PE
UPS 3
bCmCbBmBbAmAbNmNoN oN oA oB oC
PE PE
UPS 4
bCmCbBmBbAmAbNmNoN oN oA oB oC
PE PE
DB9 male port
DB9 female port
LBS cable
DB9 male port
DB9 female port
Figure 3-9 LBS cable connection
DB9 male port
DB9 female port
UPS 1
UPS 2
UPS 3
UPS 4
LBS cable
DB9 male port
DB9 female port
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Liebert NXC Parallel UPS Installation and Commissioning
3.5.5 Setting Parameters Of Double Bus System
Take the double bus system formed by 1 + 1 parallel system for example, set ‘System Configuration’ to ‘Parallel’, ‘Parallel
requisite units’ to ‘1’, ‘Parallel Redundant Units’ to ‘1’. For the master system, set ‘LBS Function’ to ‘MASTER’. For the slave
system, set ‘LBS Function’ to ‘SLAVE’. Ensure that the setting for ‘3 Phase Output or 1 Phase Output’ of each single UPS in the
double bus system is same, as shown in Figure 3-10.
ITA 016 kVA
Settings
Unit 1#
Enabled Disabled
System Configuration Parallel
Parallel requisite units 1
ESC
Disabled
Shared Battery
1 2 3 4
Single Parallel
14:30:36
ITA 016kVA
Settings
Unit 1#
0 1 2 3
ECO Mode Normal
Output frequency Level 50Hz
ESC
1
Parallel Redundant Units
Normal ECO
50Hz 60Hz
14:30:36
ITA 016kVA
Settings
Unit 1#
200 208 220 230 380 400 415 480
LBS Function MASTER
Command password
ESC
380V
Output Voltage Level
NONE SLAVE MASTER
*****
14:30:36
ITA 016kVA
Settings
Unit 1#
YDN23 Velocity
3 Phase Output or 1 Phase Output Three
ESC
YDN23
Protocol
Three Single
14:30:36
Figure 3-10 Setting interface
NXC 20kVA
NXC 20kVA
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Operation and Display Panel Liebert NXC
Chapter 4 Operation And Display Panel
This chapter introduces the functions and use of the components on the UPS operation and display panel, and provides LCD
display information, including the LCD screen types, detailed menu messages, prompt windows message and UPS alarm list.
4.1 Introduction
The operation and display panel is located on the front panel of the UPS. Through the operation and display panel, you can
conduct the UPS operation control and query all the UPS parameters, UPS and battery states, and alarm message.
As shown in Figure 4-1, the operation and display panel provides LCD, menu buttons (F1 ~ F4、HELP)、LED indicators (inverter
indicator and fault indicator ), control buttons (FAULT CLEAR, ON, OFF, ALARM CLEAR, EPO).
Figure 4-1 Operation and display panel
4.1.1 LED Indicators
The LED indicators are composed of inverter indicator and fault indicator. Table 4-1 gives the indicators description.
Table 4-1 Description of LED indicators
Indicator Colour State Meaning
Inverter indicator Green
On Load power is supplied by the inverter
Blinking Inverter on, starting up, synchronizing, or standing by (ECO mode)
Off Inverter not operating
Fault indicator Red
Blinking General fault (such as no battery)
On Serious fault (such as inverter fault)
Off No fault
4.1.2 Audible Alarm (Buzzer)
The UPS activity is accompanied with the following two different kinds of audible alarms shown in Table 4-2.
Table 4-2 Audible alarm description
Sound Meaning
One beep every second Sound is generated when the UPS alarm appears, such as AC input failure
Continuous beep Sound is generated when the UPS fault appears, such as fuse or hardware failure
LCD
Menu buttons
Control buttons
Fault indi cator
Inverter indicator
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4.1.3 Control Buttons
The operation and display panel provides five control buttons, which functions are described in Table 4-3.
Table 4-3 Description of control buttons
Control button Silk print Description
EPO switch EPO
Used to disconnect the load power and close the rectifier, inverter, static bypass
and battery
Inverter on ON Used to start the inverter
Inverter off OFF Used to close the inverter
Fault recovery on/off FAULT CLEAR Recover the UPS function (clear fault in advance)
Alarm sound silence on/off ALARM CLEAR
When an audible alarm is active, press this button to silence the audible alarm.
Press this button again can restart the buzzer
4.1.4 LCD And Menu Buttons
The operation and display panel provides an LCD and five menu buttons (F1, F2, F3, F4, HELP). Table 4-4 gives the menu buttons
function description.
Table 4-4 Menu buttons function description
Button F1 F2 F3 F4 HELP
Function 1
HOME
ESC
Escape
Left
Right
Enter
Function 2
Up
Down
LCD provides you with the user-friendly interface and the 320 × 240 dot matrix image display. The menu-driven LCD allows you
to easily browse through the input, output, load and battery parameters, learn about the current UPS status and alarm message,
perform functional setting and control operation. The LCD also stores up to 512 historical alarm records that can retrieve for
reference and diagnosis.
4.2 LCD Screen Types
4.2.1 Start Screen
Upon UPS start, the UPS executes the system self-test, and the start screen will appear and remain about 15 seconds, as shown
in Figure 4-2.
F1
F2 F3 F4
HELP
Figure 4-2 Start screen
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4.2.2 Primary Screen
After the UPS system self-test, the primary screen shown in Figure 4-3 will appear. The primary screen is composed of four
windows: system information window, data window, menu window and keypad window.
ITA 016kVA
14：30 ：36
Output
F1
F2 F3 F4
HELP
Unit 1#
A（AB） B（BC） C（CA）
= =〉
L-N voltage (V) 0.0 0.0 0.0
L-N current (A) 0.0 0.0 0.0
Frequency (Hz) 0.00 0.00 0.00
L-L voltage (V) 0.0 0.0 0.0
Power factor 0.00 0.00 0.00
System
information
window
Data window
Menu window
Keypad window
Figure 4-3 Primary screen
The current icons on top of the F1 ~ F4 and HELP menu buttons give the explanations of each button. From any menu in
primary screen, press the F1 button can return to the ‘Output’ menu. For details about the primary screen, refer to 4.3.
4.2.3 Default Screen
During the UPS operation, if there is no alarm within 2 minutes, the default screen shown in Figure 4-4 will appear. After a short
while, the LCD backlight will turn off. Press any menu button (F1 ~ F4, HELP), the primary screen will appear again.
Figure 4-4 Default screen
NXC 20kVA
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4.3 Detailed Description Of Menu Items
The description in the following refers to the LCD primary screen shown in Figure 4-3.
System information window
The system information window displays the current time and the UPS name. You are not required for operating the
information of this window. For details, see Table 4-5.
Table 4-5 System information window
Item Explanation
Liebert NXC 020kVA UPS name, which stands for Liebert® Liebert NXC 20kVA UPS
12: 30: 36 Current time (format: 24 Hours, h: min: s)
Menu window and data window
The menu window displays the menu name of the data window. The data window displays the items of the menu selected from
the menu window. UPS parameters can be browsed and functions can be set through the menu window and data window.
Details are given in Table 4-6.
Table 4-6 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
L-L voltage (V) Line voltage
Power factor Power factor
Load
Sout (kVA) Sout: Apparent power
Pout (kW) Pout: Active power
Qout (kVAR) Qout: Reactive power
Load level (%) The percentage of the UPS rated load
Crest factor Output current crest factor
System
Sout (kVA) Sout: Apparent power
Pout (kW) Pout: Active power
Qout (kVAR) Qout: Reactive power
Battery
Battery voltage (V) Battery bus voltage
Battery current (A) Battery bus current
Battery temperature (°C) Battery temperature (°C)
Battery remain time
(Min.)
Battery runtime remaining
Battery capacity (%) Battery capacity (%), compared with the new battery capacity
Battery boost charging Battery is boost charging
Battery float charging Battery is float charging
Battery is not connected Battery is not connected
Event Current alarm Display the current alarm. See Table 4-8 for UPS alarm message list
Records Historical alarm Display all historical alarms. See Table 4-8 for UPS alarm message list
Language Language selection
Options are displayed in 13 languades: Swedish, Spanish, Russian,
Chinese, Portuguese, Polish, Italian, German, French, English, Dutch,
Czech, and Turkish
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Menu Item Explanation
Settings
Display contrast Adjust the LCD contrast
Date format set MM DD YYYY, DD MM YYYY and YYYY MM DD formats can be selected
Date & time Set the date and time
Comm1 baud rate Set the communication baud rate of the USB port
Comm2 baud rate For internal communication only, which cannot be set
Comm3 baud rate Set the communication baud rate of the SNMP card port
Communication address For RS485 communication
Single Group Batt Cap Set the total battery capacity according to the configuration
Settings
Battery blocks Number
Set the battery block. Option: 30- block, 32- block, 34- block, 36- block,
38- block, 40- block
Equalize Charge Allowed Enabled or disabled
Temp Compensation Enabled or disabled
Temp Sensor Position Set the position of the temperature sensor
Shared Battery Each UPS unit in parallel system shares the battery string or not
System Configuration Set the UPS unit/parallel
Parallel Requisite Units Set the parallel units
Parallel Redundant units Set the redundant units
ECO Mode Set the operation mode. Option: Normal, ECO
Output Frequency Level Set the output frequency
Output Voltage Level Set the output voltage level
LBS Function Set LBS function. Option: NONE, SLAVE or MASTER
Command password You can change the command password. Default: ‘12345’
Protocol Set the communication protocol of the UPS
3-in 3-out/3-in 3-out
Set the output system: 3-in 3-out or 3-in 3-out
This setting can only be carried out after the EPO operation. After the
setting, you must power off the system, and confirm that the system
actual wiring mode complies with the setting. Power on the system
again, and the setting can take effect
Command
Battery maintenance test
The battery maintenance test will partly discharge the battery to get
rough assessment of the battery capacity. The load ranges from 20% to
100%
Battery capacity test
The battery capacity test will completely discharge the battery to get
accurate assessment of the battery capacity. The load ranges from 20% to
100%
System test
The UPS self-test. The user starts this function, 5 seconds later, a pop
window will appear to show the test result
Stop testing
Manually stop the test, including the maintenance test, capacity test and
system test
Forcing charge Manually conduct the battery forcing charge
Stop forcing charge Manually stop the battery forcing charge
Version
Monitor Version Provide the monitor software version
Rectifier Version Provide the rectifier software version
Inverter Version Provide the inverter software version
Keypad window
The function of menu buttons (F1 ~ F4 and HELP) is shown in icon mode for the current display screen (see
Figure 4-4).
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4.4 Prompt Window
A prompt window is displayed during the operation of the system to alert you to certain conditions and/or to require your
confirmation of a command. The prompts and meanings are given in Table 4-7.
Table 4-7 Prompts and meanings
Prompt Meaning
Transfer with interrupt, confirm or cancel
Inverter and bypass supplies are not synchronized, and the load transfer between the
bypass and inverter will cause a brief power supply interruption
This operation leads to output shutdown,
confirm or cancel
The bypass is abnormal, inverter shutdown will cause the load power-off
Turn on more UPS to carry current load
The number of paralleled inverters already turned on is insufficient to carry the
current load, thus more inverters are required
Battery will be depleted, confirm or cancel
The battery maintenance test discharges the battery completely. A prompt screen
will appear to require your confirmation. Cancelling the test will end the battery
discharge and return to the Normal mode
System self-test finished, everything is ok No operation is required
System self-test finished, please check the
current warnings
Check the current alarm message
Enter control password Control password is required for battery test or UPS test
Battery self-test condition is low, please check
battery state and load level
Battery test condition is not met. Please check whether the battery is in boost charge
state and the load level is more than 20%
Forcing charge condition is low, please check
battery state
The prompt appears when you select the forcing charge command while the forcing
charge condition is not met (such as no battery, charger failure)
Check the wiring according to the settings,
power-off takes effect, 3-phase (1-phase)
output
After the menu ‘3 Phase Output or 1 Phase Output’ is set, you can power off the
system completely, and then power on the system again after the wiring is changed
according to the settings
4.5 UPS Alarm Message List
Table 4-8 gives the UPS alarm message list based on the ‘Event’ and ‘Records’ menus.
Table 4-8 UPS alarm message list
Alarm message Description
Inverter comm. fail Internal communication failure between the monitoring board and the inverter
Rectifier comm. fail Internal communication failure between the monitoring board and the rectifier
Parallel comm. fail
The communication failure between different UPSs within a parallel system.
1. Check if there are some UPSs not powered on in parallel system. If so, power on these UPSs and check if
the alarm disappears.
2. Press the FAULT CLEAR button
Battery fault Battery is depleted (reserved)
Battery replaced Battery test failure, and the battery should be replaced
Battery low
pre-warning
Before the end of the discharge, battery undervoltage pre-warning may occur. After this pre-warning, the
battery should have the capacity for 3 minutes discharging with full load. The time is user-configured
ranging from 3 minutes to 60 minutes. Shut down the load in time
Battery stop discharge Inverter is off due to the battery end voltage. Check the mains failure and try to recover it
Mains volt. abnormal
Mains voltage exceeds the upper or lower limit and results in rectifier shutdown. Check the input phase
voltage of the rectifier
Mains undervoltage Mains is undervoltage, derate for running. Check the input line voltage
Mains freq. abnormal Mains frequency is out of the limit range and results in rectifier shutdown. Check the input frequency
Rectifier block Rectifier failure. The rectifier shuts down and the battery discharges
Rectifier overtemp.
The temperature of heat sink is too high to keep the rectifier running. The UPS can recover automatically.
Check the environment and ventilation
Battery charger fault Battery charger is over voltage
Control power 1 fail UPS operates but the control power is not available
Mains phase reversed AC input phase sequence is reversed
Rectifier overcurrent Rectifier is over current
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Alarm message Description
Soft start fail Rectifier cannot start due to the DC bus low voltage
Bypass unable to trace
This alarm is triggered by an inverter software program when the amplitude or frequency of bypass voltage
is beyond the normal range. The amplitude threshold is fixed for ±10% rating.
This alarm will automatically recover when the bypass voltage is normal.
1. First verify that the bypass voltage and frequency displayed on the LCD are within the selected range.
Note that the rated voltage and frequency are specified by the ‘Output Voltage Level’ and ‘Output
Frequency Level’ respectively.
2. If the displayed voltage is abnormal, please verify the actual bypass voltage and frequency presented to
the UPS. Check the external power if any fault is found
Bypass protection
This alarm is triggered by an inverter software program when the amplitude or frequency of bypass voltage
is too high or too low. The amplitude threshold is fixed for ±10% rating. This alarm will automatically recover
when the bypass voltage is normal.
1. First check if there are some relevant alarms, such as ‘Bypass Phase Reverse’, ‘Input Disconnect Fault’. If
so, solve them first.
2. Then verify that the bypass voltage and frequency displayed on the LCD are within the selected range.
Note that the rated voltage and frequency are specified by the ‘Output Voltage Level’ and ‘Output
Frequency Level’ respectively.
3. If the displayed voltage is abnormal, please verify the actual bypass voltage and frequency presented to
the UPS. Check the external power if any fault is found. If the utility is likely to trigger this alarm frequently,
the bypass limit can be changed a little larger through the configuration software according to the user
backfeed
Inverter asynchronous
This alarm is triggered by an inverter software program when the inverter and bypass waveforms are
misaligned by more than 6 degrees in phase. The amplitude threshold is fixed for ±10% rating. This alarm
will recover automatically when the alarm condition disappears.
1. First check if the alarm ‘Bypass Unable To Trace’ or ‘Bypass Protection’ exits. If so, solve it first.
2. Verify the waveform of the bypass voltage. If too distorted, ask the user to verify it and seek any possible
measurement
Inverter fault Inverter output voltage beyond limits. Load transfers to bypass
Inverter overtemp.
The temperature of the inverter heat sink is too high to keep the inverter running. This alarm is triggered by
the signal from a temperature monitoring thermostat on the inverter bridge heat sink. After the alarm is
cleared about 20 minutes, the inverter will start again automatically. The UPS will switch to bypass if the
alarm is triggered above one time in 2 hours, and power on the UPS manually and stwitch to inverter
working state after the alarm is cleared. Note: Wait for 20 minutes after the alarm is cleared, manual
power-on will be suceesful.
1. high ambient temperature
2. blocked cooling airway
3. any fan failure
4. prolonged inverter overload
Fan fault At least one of the cooling fans has failed
Inverter relay fail
At least one of the relays of inverter side is open or short circuit. This fault is locked until power off (for a 3-in
1-out system, possible causes for relay fault type: inverter fuse open, inverter IGBT open)
Bypass STS fail At least one of the static switches of bypass side is open or short circuit. This fault is locked until power off
Operation invalid Incorrect operation
Neighbor bypass SSTS
fail
At least one of the static switches of UPS unit bypass side in parallel system is open or short circuit. This fault
is locked until power off
Output fuse fail At least one inverter output fuse failure. The inverter shuts down, the load transfers to bypass
Unit over load
The UPS is confirmed to be overload when the load is above 105% nominal rating. The alarm automatically
recovers after the overload condition is removed.
1. Confirm that the alarm is true by checking the load percent indicated on the LCD to determine which
phase is being overloaded.
2. If the alarm is true, measure the actual output current to verify that the indications are valid. Disconnect
the unnecessary load and ensure the safety
Byp. abnormal
shutdown
Both bypass and inverter voltages are abnormal. Load interruption
Inverter over current Inverter pulse width modulation module is over current
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Liebert NXC Operation and Display Panel
Alarm message Description
Bypass phase reverse
The phase sequence direction of the bypass voltage is reversed. Normally, the phase of phase B lags 120
degrees behind phase A, and the phase of phase C lags 120 degrees behind phase B.
Verify that the phase rotation of the bypass supply presented to the UPS is correct, and rectify it if the fault is
found
Load impact transfers
bypass
A transfer to bypass occurred due to a large step load. The UPS will recover automatically. Turn on the load
in sequential order for reducing the step load of the inverter
Transfer time-out
The load is on bypass power due to the excessive number of transfers that occurred within the last hour. The
UPS will recover automatically and will transfer the load to inverter power within an hour
Bus abnormal DC bus voltage is abnormal. Inverter shuts down. Load transfers to bypass
DC bus over voltage
Rectifier and inverter are off because the DC bus voltage is too high. Check whether there is a fault in
rectifier side. If not, check whether there is an overload. After recovering the fault, restart the inverter
Bypass over current Bypass current is over limit above 135% rating. The UPS just alarms without any action
Setting save error Historical records are not saved (Reserved)
Input Disconnect Fault AC mains input neutral line is not checked out
Protocol version clash Firmware incompatibility between monitor board and Digital Signal Processor (DSP) board
Manual on Manually turn on the inverter through pressing ON on the operation and display panel
Manual off Manually turn off the inverter through pressing OFF on the operation and display panel
EPO Press the EPO button directly or receive the external EPO command
Transfer confirm Prompt to press the Enter button to acknowledge that an interrupted load transfer to bypass will happen
Transfer cancel Prompt to press the ESC button to avoid that an interrupted load transfer to bypass will happen
Fault clear Press FAULT CLEAR
Alarm silence Press ALARM CLEAR
Turn on fail
Inverter failed to turn on manually. The reason may be the invalid operation (maintenance bypass air
breaker closed), or DC bus or rectifier not ready
Alarm silence cancle Press FAULT CLEAR or ALARM CLEAR
Bypass mode The UPS is in Bypass mode
Normal mode The UPS is in Normal mode
Battery mode The UPS is in Battery mode
Check UPS output
1. Whether the EPO terminal is on the dry contact port 4
2. Whether the LCD displays “Parallel comm. Fail”
Battery float charging Battery status (floating charge mode)
Battery boost charging Battery status (boost charge mode)
Battery discharging Battery status (discharge mode)
Battery period testing Automatically periodic battery maintenance test (20% capacity discharge)
Batt. capacity testing User initiated battery capacity test (100% capacity discharge)
Batt. maint. testing User initiated maintenance test (20% capacity discharge)
UPS system testing User initiated UPS system self-test
Inverter in setting Inverter is starting up and synchronizing
Rectifier in setting Rectifier is starting up and synchronizing
Battery reverse Reconnect the battery, and check the battery wiring
No battery Check the battery and battery wiring
Auto start
UPS is off when the battery discharges completely, the inverter will automatically start after the mains is
restored
REC FLASH UPDATE Ongoing update of rectifier firmware
INV FLASH UPDATE Ongoing update of inverter firmware
MONITOR FLASH
UPDATE
Ongoing update of monitor firmware
DSP softwar error Inverter software does not match the rectifier software
Operation invalid and
Bypass unable to trace
Alarm combination, when the two alarms appear at the same time, the UPS I/O cable connection mode is
not suitable with the setting mode (3-in 3-out or 3-in 1-out)
Note:
If the alarm is caused through setting the software value by Emerson authorized engineer, and when you wish to change the setting
values, please get in touch with the Emerson local customer service centre
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UPS Operation Instructions Liebert NXC
Chapter 5 UPS Operation Instructions
This chapter gives a detailed description of the UPS operation procedures.
During the operation, the buzzer alarm may appear, at this point, you can press the ALARM CLEAR button to silence the audible
alarm.
Warning: hazardous mains and/or battery voltage exists behind the protective cover
No customer operation parts are located behind the protective covers that require a tool for removal.
Only qualified service personnel are authorized to remove such covers.
If the maintenance for rack is needed, notice that the neutral line is live.
5.1 UPS Start-Up
The start-up procedures can be performed after the installation is finished, the system has been commissioned by authorized
engineer and the external input MCBs are closed.
Warning
This procedure results in mains voltage being applied to the UPS output terminals. Confirm that the load power is safe, if there is a load
to be connected with the UPS output terminal. Ensure that the load is isolated with the UPS output terminal, if the load is not ready for
accepting the power.
The start-up mode of the single UPS includes normal mode start-up and battery mode start-up; refer to 2.5.3 and 2.5.4 for
details.
For the detailed information of the parallel UPS, refer to 3.4.3.
5.2 Transfer Procedures Between Operation Modes
Note
The Inverter operation mode include Normal mode (mains inverter) and Battery module (battery inverter).
5.2.1 Transfer From Normal Mode To Battery Mode
In the event of mains failure, the UPS will transfer to Battery mode. If you wish to transfer the UPS from Battery mode to Normal
mode, you should wait few seconds for mains input recovery. 10 seconds later, the rectifier will restart automatically, and the
inverter will restore the power.
5.2.2 Transfer From Inverter Mode To Bypass Mode
In Inverter mode, press the OFF button for 2 seconds, you can transfer the UPS to Bypass mode.
Note
In Bypass mode, the load accepts the power not from the pure power outputted by the inverter, but from the mains power directly.
For the detailed information of the Normal mode, Bypass mode, Battery and Maintenance Bypass mode, please refer to 1.5.
5.2.3 Transfer From Bypass Mode To Inverter Mode
In Bypass mode, press the ON button for 2 seconds. After the inverter runs in normal state, the UPS transfers to Normal mode.
5.2.4 Transfer From Inverter Mode To Maintenance Bypass Mode
When the UPS is running in Normal mode, you can use this procedure to make the load transfer from inverter output to
maintenance bypass.
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Liebert NXC UPS Operation Instructions
Caution
Before performing this procedure, you should check the LED information first, and make sure the bypass is normal and synchronizes
with the inverter. Otherwise, it may result in the load power interruption for a while.
1. Press the OFF for 2 seconds.
The inverter indicators are off and the buzzer alarms. The load transfers to the static bypass, and the inverter shuts down.
Note
Press the ALARM CLEAR button can silence the alarm, but the alarm message of the the LCD is not disappeared until the alarm status is
cleared.
2. Close the maintenance bypass LBS (QS3) on the UPS rear panel, and the maintenance bypass can supply power to the load.
Warning
If you wish to maintain the UPS module, open the battery LBS QS6 and QS7, and you should wait 10 minutes for the internal DC bus
capacitance voltage discharging.
3. Disconnect the main/bypass input switch and output switch (LBS QS1, QS2 and QS4)
Caution
1. When the UPS is in Maintenance Bypass mode, the load does not have the mains abnormal protection.
2. After the UPS transfers to the maintenance bypass, the UPS is not in operation, and the LCD is no display, and only the user terminal
block is electrified. Be careful when removes the UPS module to be maintained.
5.2.5 Transfer From Maintenance Bypass Mode To Inverter Mode
After UPS maintenance, you can use this procedure to transfer the load from the maintenance bypass to the inverter.
Warning
As no auxiliary contact information of the maintenance bypass LBS QS3 is introduced into the UPS, UPS operation restoration after
maintenance must be done strictly following this procedure. Failure to observe this may cause damage to the equipment.
1. Close the output LBS QS4 on the rear panel of the UPS.
2. Close the mains input LBS QS1 and bypass input LBS QS2 on the rear panel of the UPS.
3. Wait until the UPS starts to operate in Bypass mode, and open the maintenance bypass LBS QS3 on the rear panel of the UPS.
4. Press the ON button on the operation and display panel of the UPS, and the UPS transfers to Inverter mode.
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5.3 UPS Complete Shutdown
If you need to shut down the UPS completely, transfer the UPS from Inverter mode to Maintenance Bypass mode according to
the procedures in 5.2.4, so as to make no effect on the use of the load during the UPS power-off. Then if the power to the load is
not needed, open the maintenance bypass LBS directly, as shown in Figure 5-1.
Figure 5-1 Configuration of the UPS with external maintenance bypass
For the UPS system which the distribute power is accomplished by user, if you need to isolate the UPS from AC power,
disconnect the external input MCB. (If the mains and bypass are independently powered, close the two input MCBs).
Caution
Open the maintenance bypass input in order to prevent the physical injury.
5.4 EPO
EPO switch is designed to switch off the UPS in emergency conditions (such as fire, flood). The system will turn off the rectifier,
inverter and stop powering the load immediately (inverter and bypass output included), and the battery stops charging or
discharging.
If the mains input is present, the UPS control circuit will remain active; however, the output is closed. To remove all mains power
from the UPS, the external input switch should be disconnected.
5.5 Auto Restart
When the mains power failure, the UPS draws power from the battery to supply the load until the batteries end of discharge is
reached, then the UPS will shut down.
The UPS will automatically restart and recover output power supply:
After the mains power is restored.
The UPS Auto Restart function is enabled.
After the Auto Restart is delayed (default: 10 minutes). During the Auto Restart delay, the UPS will charge the battery to
provide a safety margin for equipment shutdown if input power fails again.
If the Auto Restart function is disabled, you can restart the UPS manually by pressing the FAULT CLEAR button.
5.6 UPS Reset
The EPO action or the following reasons such as inverter overtemperature, power-off overload, battery overvoltage and
excessive switching may result in the UPS power-off. After all appropriate measures have been taken to clear the faults indicated
by the alarm message appearing on the LCD, you can carry out the following steps to restore the UPS to normal operation state.
1. Press the FAULT CLEAR button to make the system exit the EPO state.
2. Press the ON button for 2s.
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Liebert NXC UPS Operation Instructions
Note
1. The rectifier restarts, and the bypass supplies power to the load. When the rectifier starts, the fault indicator blinks. When the rectifier
runs in normal operation state (about 30 seconds later), the fault indicator will turn off.
2. 5 minutes after the overtemperature signal disappears, that is, when the overtemperature fault is eliminated, the rectifier will
automatically start.
3. After the EPO button is pressed, if the mains input is disconnected, the UPS will shut down completely. When the mains input is
available, the UPS will start and run in Bypass mode, and also the output is available.
5.7 Language Selection
The LCD menus are available in 17 languages: English, German, Italian, French, Spanish, Portuguese, Chinese, Japanese, Swedish,
Russian, Polish, Czech, Turkish, Arabic, Dutch, Finnish and Norwegian.
Procedures for selecting the language:
1. From the ‘Output’ menu, press F3 or F4 (left or right arrow) to select the ‘Language’ menu.
2. Press F5 (Enter) to move the cursor to the data window of the LCD.
3. Use F3 and F4 (up and down arrow) to select the required language.
4. Press F5 (Enter) to confirm.
5. Return to the ‘Output’ menu by repeatedly pressing F2 (ESC). At this point, all texts on the LCD will be displayed in the
selected language.
5.8 Changing Current Date And Time
Procedures for changing the system date and time:
1. From the ‘Output’ menu, press F3 or F4 (left or right arrow) to select the ‘Settings’ menu.
2. Press F5 (Enter) to move the cursor to the data window of the LCD.
3. Use F3 and F4 (up and down arrows) to select ‘Date & time’ option, then press F5 (Enter).
4. Move the cursor to the row in which the date and time are displayed, then press F5 (Enter).
5. Use F3 or F4 (up or down arrows), and enter the current time and date information.
6. Press F5 (Enter) to confirm, and then press F2 (ESC) to return to the ‘Output’ menu.
5.9 Control Password
The system provides the password protection for the UPS operation control. The default password of the background software
is ‘12345’. Only through the password verification can you conduct the UPS and battery test operation.
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Communication Liebert NXC
Chapter 6 Communication
This chapter briefly introduces the UPS communication.
The communication ports include: Intellislot cards port, dry contact port and USB port.
6.1 Installing Intellislot cards
6.1.1 Intellislot cards Port
UPS provides a Intellislot cards port (see Figure 6-1), which is used to install the communication device options, including global
connectivity cards and LIFE.net adapter. The Intellislot cards port and USB port can be used at the same time.
Figure 6-1 Intellislot cards installation
Refer to UPS Extended Dry Contact Card User Manual for the installation and operation guide.
6.2 Connection Cables For Dry Contact Port
The UPS provides five dry contact ports; see Figure 1-3 for the specific positions. The silk prints of the five dry contact ports are
1, 2, 3, 4 and 5. The pin layout of each dry contact port is shown in Figure 6-2, and the port description is shown in Table 6-1.
+12V +12V +12V
SALARM
GND
On_battery
GND
On_bapass
GND
Epo_NC
+12V
+12V
Epo_IN
BFP_o
BFP_s
BFP_c
Dry contact port 1 Dry contact port 2 Dry contact port 3 Dry contact port 4 Dry contact port 5
Figure 6-2 Pin layout of dry contact ports
Intelligent card port
Dry contact port 1 Dry contact port 2 Dry contact port 3 Dry contact port 4
Dry contact port 5
SALARM
GND
On_batter
y
GND
GND
On_b
yp
ass
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Liebert NXC Communication
Table 6-1 Description of the dry contact ports
Silk print Port name Pin NO. Pin name Meaning
1 Output port of alarm
1.1 S_ALARM The signal level is 12V when the system alarms
1.2 GND GND
2
Output port of battery
status
2.1 ON_BATTERY
The signal level is 12V when the system runs in battery
inversion mode
2.2 GND GND
3
Output port of bypass
status
3.1 ON_BYPASS The level is 12V when the system runs in bypass mode
3.2 GND GND
4
Input port of remote
EPO*
4.1 EPO_NC EPO activated when opened to 4.2
4.2
＋
12V
EPO activated when opened to 4.1
4.3
＋
12V
EPO activated when shorted to 4.4
4.4 EPO_IN EPO activated when shorted to 4.3
5
Output port of bypass
reflected
5.1 BFP_O
Bypass backfeed protection relay (normally open).
Closes when short circuit of bypass silicon controlled
rectifier (SCR) leads to backfeed
5.2 BFP_S
The middle point of the bypass backfeed protection
relay
5.3 BFP_C
Bypass backfeed protection relay (normally open).
Opens when shoft circuit of bypass SCR leads to
backfeed
Note*:
Pin1 and pin2, or pin3 and pin4 of the dry contact port 4 reserves the corresponding terminals for configuring the REPO function.
The REPO device also needs the shielded cable to connect to the normally open/closed remote REPO switch between the two
terminals. If not necessary, you should disconnect pin3 and pin4 of the dry contact port 4, or short pin1 and pin2 of the dry contact
port 4. Pin1 and pin2 of the dry contact port 4 have been shorted before delivery
Note
The EPO action of the UPS will close the rectifier, inverter and static bypass, but it cannot disconnect the UPS mains input inside. If
you want to disconnect the UPS completely, just disconnect the upstream input MCB when generating the EPO.
In emergency conditions, close the REPO switch (prepared by users) to shut down the rectifier and inverter, and the UPS is
powered off. In normal condition, the REPO switch cannot cut off the UPS input power. If a switch of electronic control tripping
function is adopted at the UPS input, the REPO switch can help the switch trip and thus cut off the UPS input power. The
position of the REPO switch is shown in Figure 1-3, and the REPO cable connection is shown in Figure 6-3.
Figure 6-3 REPO cable connection
The cable connection procedures are as follows:
1. Loosen the “+12V” and “EPO_IN” connection terminals of the REPO port.
2. Insert the two ends of the copper core cables with the insulation leather peeled into the “+12V” and “EPO_IN” connection
terminals of the REPO port, and press down the terminals. The REPO cable is complete. Ensure that the REPO cable is firmly
connected to avoid no action or wrong action of the REPO caused by accidental dropping or infirm contact.
3. For parallel UPSs, when connecting the REPO cable, users should parallel connect “+12V” of the REPO port with one end of
the electronic switch, and parallel connect “EPO_IN” with the other end of the electronic switch. Note the difference between
the port silkscreen “+” and “-” during connection.
When the REPO switch at the user end closes, the UPS will generate an alarm and cut off the output immediately, and the UPS
will not return to the normal operation state automatically. At this point, you must change the REPO switch state, and power on
the UPS manually.
REPO switch
REPO plug
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Communication Liebert NXC
Note
1. It is recommended to use 0.82mm2 ~ 0.33mm2 (signal cable of 18AWG ~ 33AWG) copper core cable.
2. If the switch you have configured is of electronic control tripping function, when the REPO signal takes action, you need to close
the switch before restart the UPS.
6.3 Connecting USB Communication Cables
The USB port is located on the rear panel of the UPS, as shown in Figure 1-3.
The USB port can connect the monitoring software.
The methods to connect the communication cable are as follows:
Insert one end of the USB communication cable to the USB port (see Figure 1-3) on the rear panel of the UPS, and connect the
other end to the USB port of the computer.
After the connection, you need to install the USB drive program in the installation disk.
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Liebert NXC Maintenance
Chapter 7 Maintenance
This chapter focuses on the UPS maintenance, including the fan maintenance, battery maintenance, UPS cleaning, UPS state
check, UPS function check.
7.1 Fan Maintenance
The UPS fans are expected to run for 20000 hours ~ 40000 hours continuously. The higher the ambient temperature, the
shorter the fan life is.
During the UPS operation, please verify the fan status once every half year by confirming that air blows out from the ventilation
holes on the rear panel.
7.2 Battery Maintenance
Note
1. Never reverse-connect the battery, otherwise the fire will occure.
2. Never open the battery to prevent physical injury because of the electrolyte. If you accidentally touch the electrolyte, wash the
area immediately with plenty of clean water and go to hospital.
The internal battery module of the UPS is sealed, lead-acid, maintenance-free battery. The battery life depends on the ambient
temperature, charge and discharge times. High ambient temperature and deep discharge shortens the battery life.
To ensure the battery life, it is required to:
Keep the ambient temperature ranging from 15°C to 25°C.
Prevent small current discharge. Continuous battery operation time exceeding 24 hours is strictly prohibited.
Charge the battery for at least 12 hours, if the battery hasn't been charged for three months at specified ambient
temperature, or two months at high ambient temperature.
Note
1. Check regularly the screws at the battery connection parts, fasten it immediately if not tight.
2. Make sure that the safety equipment are complete and that the function is normal, especially that the settings of the battery
management parameters are normal.
3. Measure and record the internal temperature of the battery room.
4. Check whether the battery ports are damaged or hot, and whether the chassises and the covers are damaged.
If liquid leakage and damage to the battery are found, place the battery in the anti-vitriol tank, and deal with it according to the
local regulations.
The waste lead-acid battery is dangerous waste material. It is one of the national emphases to control the waste battery
pollution. Its storage, transportation, usage and disposal must follow the national and local law and other criterions about the
dangerous waste material and the waste battery pollution prevention.
According to the related regulations, recycle the waste lead-aid battery, and other disposal methods are prohibited. Throwing
away randomly the waste lead-aid battery and other improper disposal methods can result in serious environment pollution,
which will be investigated the legal responsibility.
As the provider of the lead-acid battery, Emerson has built perfect service network and recycle system for the waste battery to
assist users to deal with the waste battery by law. Contact Emerson or the nearest service centre for the detailed information of
the recycle system about the waste battery.
Emerson is not liable for the environment results caused by failure to comply with the notices in this section or to use the waste
battery recycle system provided by Emerson.
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7.3 Cleaning UPS
Clean the UPS periodically, especially the ventilation holes, to ensure free airflow inside the UPS. If necessary, clean the UPS with
a vacuum cleaner. Confirm that the ventilation holes are unobstructed.
7.4 Checking UPS State
It is recommended to check the UPS operation status once every half year.
Check the following items:
1. Check if the UPS is faulty: Is the FAULT indicator on? Is the UPS giving any alarm?
2. Check if the UPS is operating in Bypass mode. Normally, the UPS operates in Normal mode; if it is operating in Bypass mode,
you should find out the reason, such as operator intervention, overload, internal fault, and so on.
3. Check if the battery is discharging: When AC mains is normal, the battery should not discharge; if the UPS operates in Battery
mode, you should find out the reason, such as mains failure, battery test, operator intervention, and so on.
7.5 Checking UPS Functions
Note
UPS functions check procedures may cause power interruption to load!
It is recommended to check the UPS functions once every half year.
Backup the load data before conducting the UPS functions check. Procedures are as follows:
1. Press the OFF button to check if the buzzer beeps, indicators are on and the LCD display is normal.
2. Press the ALARM CLEAR button to check again if the indicators are on, the LCD display is normal and the UPS has been
transferred to the inverter mode.
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Liebert NXC Options
Chapter 8 Options
This chapter introduces the options of the UPS.
8.1 Option list
See Table 8-1 for the option list.
Table 8-1 Option list
Option name Model Remark
Communication
cables
UHRK2S671SL4 Liebert® NXC 10/15/20kVA UPS parallel communication cables
8.2 Communication Cables
Communication cable is compulsory in parallel system. See Table 8-2 for cable description. Refer to 3.3.2 for the methods to
connect the parallel cables.
Table 8-2 Description of the communication cable
Type Name Description Appearance
UHRK2S671SL4
Communiation
cable
For N + 1 parallel system, N + 1 communication cables are
needed. For example, two communication cables are needed
in 1 + 1 parallel system; three communicatio cables are
needed in 2 + 1 parallel system; four communication cables
are needed in 3 + 1 parallel system
8.3 Battery Cabinet
For extra long back up time an external battery cabinet is available.
Figure 8-1 Appearance of the battery cabinet
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Options Liebert NXC
8.4 Liebert NXC Input Transformer Version
This UPS includes an insulation 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.
UPS with input insulating transformer
8.5 Liebert NXC Output Transformer Version
This UPS includes an insulation 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.
UPS with output insulating transformer
must be not connected!
UPS MODULE
RECT INV
CHARGER
COMMUNICATION
PORTS
OP. AND DISP.
PANE L
OUTPUT: 3AC
/
N 400V 50
/
60HZ
MAINS INPUT:
3AC/N 400V 50/60H
Z
EXT. BATTERY
free
Tra ns for mer
free
UPS MODULE
RECT INV
CHARGER
COMMUNICATION
PORTS
OP. AND DISP.
PANE L
OUTPUT: 3AC
/
N 400V 50
/
60HZ
MAINS INPUT:
3AC/N 400V 50/60H
Z
EXT. BATTERY
Tra ns for mer
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