AC Power For Business-Critical Continuity™ Liebert® NX™ Operation and Maintenance Manual – 225-600kVA, Three-Phase, Single-Module & Multi-Module
CONTACTING EMERSON NETWORK POWER FOR SUPPORT To contact Emerson Network Power Liebert Services for information or repair service in the United States, call 800-543-2378. Liebert Services offers a complete range of star-up services, repair services, preventive maintenance plans and service contracts. For repair or maintenance service outside the 48 contiguous United States, contact Liebert Services, if available in your area.
TABLE OF CONTENTS IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 SAVE THESE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 1.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6 Automatic Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 2.6.1 Overloads (Without Transfer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 2.6.2 Automatic Transfers to Bypass (Overload Condition) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 2.6.3 Automatic Transfers to Bypass, UPS System Faults . . . . . . . . . . . . . . . . . . . . . . . . . . .
FIGURES Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Typical single module UPS system one-line diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Main component locations-225 to 300kVA Liebert NX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Main components, 400-600kVA Liebert NX . . . . . . . . . . . . . . . . . . . . . . . .
iv
Important Safety Instructions IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS This manual contains important instructions that should be followed during installation of your Liebert NX UPS. Read this manual thoroughly, paying special attention to the sections that apply to your installation, before working with the UPS. Retain this manual for use by installing personnel. ! WARNING Risk of electric shock. Can cause equipment damage, injury or death.
Important Safety Instructions Battery Cabinet Precautions The following warning applies to all battery cabinets supplied with UPS systems. Additional warnings and cautions applicable to battery cabinets may be found in Important Safety Instructions on page 1 and 4.4 - Battery Maintenance. ! WARNING Risk of electric shock, fire and smoke. Can cause equipment damage, injury and death. Internal battery strapping must be verified by manufacturer prior to moving a battery cabinet after initial installation.
Introduction 1.0 INTRODUCTION 1.1 General Description The Liebert NX UPS provides continuous, high-quality AC power to your business-critical equipment, such as telecommunications and data processing equipment. The Liebert NX UPS supplies power that is free of the disturbances and variations in voltage and frequency common to utility power, which is subject to brownouts, blackouts, surges and sags.
Introduction 1.2 Modes of Operation 1.2.1 Normal Mode Operating in normal mode, the Liebert NX’s rectifier derives power from a utility AC source and supplies regulated DC power to the inverter, which regenerates precise AC power to supply the connected equipment. The rectifier also uses the utility source power to charge the DC sources. 1.2.2 Bypass Mode When the Liebert NX is in bypass mode, the load is directly supported by utility power and is without DC source backup protection.
Introduction 1.3 Options A number of options are available from Emerson® for your UPS system. Some options are not available for all ratings. Described below are the most frequently provided options. Other options are available. Contact your Emerson sales representative for more information. • Battery and Racks—The batteries provide power in the event of a power outage.
Operation 2.0 OPERATION The Liebert NX UPS is equipped with a microprocessor-based display touchscreen designed for convenient and reliable operation. The display is driven by menu-prompted software. 2.
Operation Figure 3 Main components, 400-600kVA Liebert NX HMI Screen Main Input Circuit Breaker (CB1) Optional Backfeed Circuit Breaker (BFB) External Communication Panel FRONT DOORS REMOVED Bypass Busbars Ø A,B,C Rectifier Input Busbars Ø A,B,C Output Busbars Ø A,B,C Battery Busbars (+ / -) Input Ground Busbar DOORS AND INNER SKINS REMOVED 7 Liebert®NX™
Operation Figure 4 Main display screen, typical 9 1 3 5 2 8 6 4 7 4. Battery: voltage and current readings 5. System Status 6. Control Buttons 7. Menu Buttons 8. Animated One Line Mimic 9. About Button 1. Bypass Input: voltage and frequency readings 2. Line power Input: voltage, current and frequency readings 3.
Operation Figure 7 Load on bypass UPS Module Module Bypass AC Input BFB Module Rectifier AC Input UPS Output DC Bus Critical Load To DC Supply 2.2 Touchscreen Navigation Several menu items can be accessed from the main display screen (see Figure 9). These menu items are detailed in subsequent sections. 2.2.1 Main Display Screen This is the default screen.
Operation 2.2.2 Status This menu item displays a list of current Fault Warnings and Info. Figure 8 2.2.3 Status Events Log Menu This menu item displays the list of Events that occurred recently while the UPS was in operation. 2.2.4 Measures Menu This menu item displays the full set of measurements for each functional block (rectifier, bypass, booster/charger, batteries, inverter and load).
Operation Figure 9 2.2.5 Measures menus Battery Menu This menu item displays the battery status/parameters such as temperature, cell voltage, capacity and run time, as well as commands that enable the user to the user to configure and execute the battery test.
Operation Battery Measures This section monitors variables applicable to the battery.
Operation 2.2.6 Life Menu This menu displays the information about the status of Liebert LIFE.net connections, status of calls and types of calls and allows certain specific commands to be executed. This button is not active if the LIFE.net option is not available on UPS.
Operation 2.2.7 Settings Menu This menu item displays the LCD settings and selected language. Figure 12 Settings Menu 2.3 Animated One Line Mimic This displays all the functional blocks in the UPS. Touch any icon to obtain detailed information about the corresponding functional block.
Operation 2.4.1 Load on Bypass In this operating mode, the connected loads are supplied from line power via the Static Bypass Switch. The Static Bypass Switch is used to provide power to the loads. If an overload or short-circuit on UPS output occurs, the Static Bypass Switch is automatically activated to provide uninterrupted power to the loads. The Bypass operating condition is displayed. From this operating mode, the UPS automatically reverts to on-line operation after the fault is corrected.
Operation 2.4.2 Input Power Failure—Load on DC Source If the utility AC power source fails or is outside the acceptable range, the DC source becomes the power source for the UPS module inverters. The UPS continues to supply power to the critical load and also to the UPS controls. Use the Battery Time screen at the UPS modules to monitor the present DC source voltage compared to the shutdown value.
Operation 2.4.4 Remote Emergency Power Off The Remote Emergency Power Off control is a user-provided switch located remotely from the UPS system. It usually is installed in the same room as the critical load equipment. This mode can also be initiated by an automatic contact closure in the same external circuit as the manually operated switch. When the Remote Emergency Power Off switch is operated, the UPS will shut down and open bypass circuit breakers. All power through the UPS is removed from the load.
Operation 2.5.1 Startup—Single Module System This section lists typical step-by-step instructions. ! WARNING Risk of electric shock. Can cause equipment damage, personal injury and death. The following procedure provides power to the critical load distribution system. Verify that the critical load distribution is ready to accept power. Make sure that personnel and equipment are ready for the critical load distribution system to be energized.
Operation g. Close all DC breakers. NOTICE Risk of improper operation. Can cause equipment damage. Do not close the battery breaker until the DC bus is above 540VDC. h. Press the “Start Inverter” button on touchscreen. Press “Confirm” on the popup window and the load will be energized from the UPS inverter. NOTICE Risk of equipment damage. If an abnormal situation occurs during this startup procedure, open the input circuit breaker and investigate the problem. Call Liebert Services if help is required.
Operation 2.5.3 Load Transfer and Retransfer-Single Module System Changing the load from the UPS system to the UPS bypass is called a transfer. Changing the load from UPS bypass to the UPS system is called a retransfer. Note that the UPS system control logic can initiate automatic load transfers and retransfers. Refer to 2.6 - Automatic Operations. Transfer Procedure 1. Press the “Stop Inverter” menu button on the touchscreen. 2. The load will transfer to Bypass mode and Inverter will turn Off.
Operation 2.5.5 Maintenance Bypass Load Transfers-Single Module System: If Load is on Maintenance Bypass 1. Verify that the module’s rectifier is On and in bypass mode. See 2.5.1 - Startup—Single Module System for the startup sequence. 2. Close the Bypass Input Breaker (BIB) or verify that it is closed. This breaker is external to the UPS; it may be in the Maintenance Bypass Cabinet. 3. Close the UPS Backfeed Breaker (BFB). Refer to 2.5.1 - Startup—Single Module System. 4.
Operation 2.5.7 1+N System: Transfer load from Bypass to UPS 1. Verify that the module’s rectifier is On and in bypass mode. See 2.5.1 - Startup—Single Module System for the startup sequence. 2. For every module in the system, close the Bypass Input Breaker (BIB) or verify that it is closed. This breaker is external to the UPS; it may be in the Maintenance Bypass Cabinet. 3. For every module in the system, close the Module Output Breaker (MOB) or verify that it is closed.
Operation 3. If using a key interlock system, a. The “OK to transfer” lamp on the key-release unit will light. b. Depress the key-release unit push button. c. Turn the key and remove it from the key-release unit. d. Insert the key into the lock for the Maintenance Bypass Breaker (MBB). e. Retract the bolt. 4. Close the Maintenance Bypass Breaker (MBB). 5. Open the Maintenance Isolation Breaker (MIB). The UPS system is now isolated from the critical load and the load is now on Maintenance Bypass. 6.
Operation 2.6 Automatic Operations The Liebert NX UPS system is designed to function while unattended by an operator. The system control logic monitors the performance of the UPS, the availability of power sources and the current required by the critical load. The system control logic: • Determines what overload conditions can be sustained without a transfer to bypass. • Initiates an automatic transfer to bypass to sustain an overload or when selected UPS faults occur.
Operation 2.6.2 Automatic Transfers to Bypass (Overload Condition) The UPS system will initiate an automatic load transfer to the bypass line if an overload condition exceeds the current-versus-time curve of overload capacity or if specified UPS system faults occur. The Overload Transfer and Output Undervoltage alarm messages will initiate an automatic transfer to bypass.
Operation 2.6.4 Automatic Retransfers to UPS The following critical bus conditions must be present to initiate an automatic retransfer of the critical load from the bypass source to the UPS inverter: 1. Critical load was initially transferred to the bypass source due to a system overload only. A manual retransfer from bypass is required if the transfer to bypass was caused by any condition other than output overload. 2. Overload has since dropped below 95% of the rated load. 3.
Options 3.0 OPTIONS 3.1 Remote Alarm Unit A remote alarm panel is available for displaying important individual UPS messages. The length of the connection cable must not exceed 1000ft. 3.2 MopUPS Shutdown and Monitoring Software The MopUPS Professional software package provides safe system shutdown and power management.
Options 3.3 Manage UPS Adapter ManageUPS NET Adapter III offers an open approach to network power management by delivering a complete set of manageability options including: WEB, Telne and Out-Of-Band accessibility, in addition to the full-featured, embedded SNMP agent. Event messages are also available as e-mail and SNMP Traps - a truly versatile tool for managing Liebert NX UPS systems in a network environment.
Options 3.4.1 Available Selectable Input Contacts • • • • • • • On Gen Fast Power Off MBB Aux Contacts Start battery test (see Note 4 below) Fault acknowledge Bypass and Inverter both Off Stop battery test (see Note 4 below) Notes 1. 2. 3. 4. 3.4.2 Each signal can be inverted Each signal can have a turn-on delay applied from 0-60 seconds Each signal can have a turn-off delay applied from 0-60 seconds To guarantee that the command is accepted, keep the function active at least 10/15 seconds.
Maintenance 4.0 MAINTENANCE 4.1 Safety Precautions Observe the safety precautions in Battery Cabinet Precautions on page 2. Observe all of the warnings below before performing any maintenance on the UPS and associated equipment. Also observe the manufacturer’s safety precautions pertaining to the DC source, along with the DC source safety precautions in this section.
Maintenance 4.2 Liebert Services Startup, UPS maintenance, DC source maintenance and training programs are available for the Liebert NX UPS through your Emerson® sales representative. 4.2.1 Professional Startup UPS Startup—Emerson® customer engineers perform a thorough non-powered inspection of the units and will then conduct a complete electrical checkout. The DC source installation is also inspected and placed on an initialization charge to ensure cell equalization.
Maintenance 4.3 Routine Maintenance You should become thoroughly familiar with the equipment, but at no time should you go beyond the specific procedures in this manual while performing maintenance or correcting a malfunction. If you have any doubt as to what must be done, call Liebert Services at 1-800-LIEBERT for further instructions. The UPS is designed for unattended operation, but does require some common-sense maintenance.
Maintenance 4.3.3 Limited Life Components The Liebert NX UPS has a design life well in excess of 10 years. Well-maintained units can continue to provide economic benefits for 20 years or more. Long-life components are used in the UPS wherever practical and cost-effective.
Maintenance 4.4.1 Battery Safety Precautions Servicing of batteries should be performed or supervised by personnel knowledgeable of batteries and the required precautions. Keep unauthorized personnel away from batteries. When replacing batteries, use the same number and type of batteries. ! WARNING Risk of electric shock, explosive reaction, hazardous chemicals and fire. Can cause equipment damage, personal injury and death. Lead-acid batteries contain hazardous materials.
Maintenance NOTICE Risk of improper cleaning. Can cause equipment damage. Batteries should be cleaned with a dry cloth or a cloth lightly moistened with water. Do not use cleaners on the batteries. Solvents can make the battery cases brittle. Because individual battery characteristics are not identical and may change over time, the UPS module is equipped with circuitry to equalize battery cell voltages. This circuit increases charging voltage to maintain flooded type battery cells at full capacity.
Maintenance Battery Cell Terminals: Check for discoloration, corrosion and connection integrity. Clean and tighten if necessary. NOTE that when installing a new battery, the initial torque value is 5 lb.-in. more than the retorque value. Table 7 shows battery retorque values. Table 6 Battery retorque values Battery Mfr. C&D Enersys East Penn Battery Model # Retorque Value in-lb (N-m) UPS12-300MR 110 (12.4) UPS12-350MR 110 (12.4) UPS12-400MR 110 (12.4) UPS12-490MRLP 110 (12.
Maintenance 4.5 Detecting Trouble It is important that the operator check the instrument readings if abnormal equipment performance is suspected. Any metered value that differs appreciably from normal could mean an impending malfunction and should be investigated. 4.5.1 Items to check include: • If the UPS has not operated on battery power during the last 10 hours, the batteries should require little charging current.
Specifications 5.0 SPECIFICATIONS 5.1 DC Sources 5.1.1 Battery Operation The separate battery manufacturer’s manual, available on the manufacturer’s Web site, provides the necessary information for the installation, operation and maintenance of the battery. Use the battery manual in conjunction with this manual. The float charge voltage for a battery is equal to the number of cells in series making up the battery multiplied by the charge voltage for each cell.
Specifications Table 8 Electrical specifications Input Parameters Input Voltage to Rectifier, VAC, 3-phase, 3-wire Input Voltage to Bypass, VAC, 3-phase, 3-wire Input Voltage Range, VAC Input Frequency, Hz Permissible Input Frequency Range, Hz Rectifier Power Walk-In, sec 480V 480V +10% to -30% 60 55-65 1-90 (selectable) in 1 Sec. Increments DC Parameters Battery Type DC Bus Range, VDC DC Float Voltage, VPC End-Cell Voltage, VPC DC Ripple Voltage in Float and Const V Ch.
Specifications Liebert®NX™ 40
Ensuring The High Availability Of Mission-Critical Data And Applications. Emerson Network Power, a business of Emerson (NYSE:EMR), is the global leader in enabling Business-Critical Continuity™ from grid to chip for telecommunication networks, data centers, health care and industrial facilities.
