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Manual Liebert 610
Summary
B ATTERY C ABINET P RECAUTIONS The following warning applies to all battery cabinets supplied with UPS systems. Additional warn- ings and cautions applicable to battery cabinets may be found in Important Safety Instructions and 4.4 - Battery Maintenance . C ONTACTING L IEBERT FOR S UPPORT To contact...
i TABLE OF CONTENTS B ATTERY C ABINET P RECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I NSIDE F RONT C OVER C ONTACTING L IEBERT FOR S UPPORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I NSIDE F RONT C OVER I MPORTANT S AFETY I NSTRUCTIONS . . . . . . ...
ii 3.3 Modes of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 3.3.1 Load on Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 3.3.2 OK...
iii FIGURES Figure 1 UPS controls and display screen with example of the Monitor/Mimic screen. . . . . . . . . . . . . . . . . 6 Figure 2 Typical UPS system one-line diagram with optional maintenance bypass . . . . . . . . . . . . . . . . . . 16 Figure 3 Operator controls, typical system . . . . . ....
iv Figure 50 Load on maintenance bypass (two breakers). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67Figure 51 Load on maintenance bypass (three breakers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68Figure 52 Start-up proce...
1 I MPORTANT S AFETY I NSTRUCTIONS SAVE THESE INSTRUCTIONS This manual contains important instructions that should be followed during installation and mainte- nance of your Series 610 UPS and batteries. ! WARNING Exercise extreme care when handling UPS cabinets to avoid equipment damage or injury to...
Introduction 2 1.0 I NTRODUCTION 1.1 System Description The role of a UPS system is to supply uninterruptible, clean power to the critical load. The UPS main- tains a full-voltage, low-distortion output, even if the utility source power sags, becomes distorted or fails.If there is an outage of the s...
Introduction 3 1.2 Reliability Reliability is the most important design goal for Uninterruptible Power Systems. Liebert Series 610 UPS systems have demonstrated reliability by achieving a field-proven critical bus MTBF in excess of 2 million hours. In addition, our Quality Assurance program is certi...
Introduction 4 1.3 Safety Precautions Read this manual thoroughly, paying special attention to the sections that apply to you, before work- ing with the UPS. Also refer to the battery manufacturer’s manual, available on the manufacturer’s Web site, before working on or near the battery.Under typical...
Introduction 5 1.4 Modes of Operation Refer to 2.0 - Theory of Operation and 3.0 - Operation for more details. 1.4.1 Normal—Load on UPS The utility AC source provides power to the rectifier/charger in the UPS module. The rectifier/charger converts the utility AC power to DC and supplies DC power to ...
Introduction 6 1.5 Operator Controls Liebert Series 610 UPS modules are equipped with a microprocessor-based Operator Display Screen and Control Panel designed for convenient and reliable operation. The front panel location of the mon- itoring and control system enables the user to quickly identify ...
Introduction 7 1.6 Options A number of options are available from Liebert for your UPS system. (Some options are not available for all ratings.) Described below are the most frequently provided options. Note that the battery items ( 1 - 3 ) are required to complete the UPS system. The remaining opti...
Introduction 8 12. Customer Alarm Interface This optional interface board allows the input and display of 8 alarms from customer-supplied contacts, each with a customer-selected name of up to 16 characters. The following attributes can be user programmed for each alarm: latching, summary, freeze his...
Theory of Operation 9 2.0 T HEORY OF O PERATION 2.1 General Component Descriptions The UPS system includes all of the equipment necessary to continuously provide computer-grade AC power to a critical load, even when there is an interruption of the utility power. It consists of the UPS modules and a ...
Theory of Operation 10 2.2 Detailed Component Descriptions 2.2.1 Controls Hardware The Series 610 UPS Operator Interface Display System is designed to provide all of the information that is required for the operation of each UPS module. The following is a list of the hardware features:1. The control...
Theory of Operation 12 2.2.3 Battery Charging Circuit The UPS module charging circuit is capable of recharging the battery plant to 95% of full capacity within 10 times the discharge time. Recharging the last 5% takes longer because of characteristics inherent in the battery. DC ripple voltage is li...
Theory of Operation 13 2.2.4 Inverter The inverter is a solid state device that converts the DC output of the rectifier/charger or the battery to AC power. Operation The inverter converts DC power—from either the battery or the rectifier/charger—into three pulse- width-modulated/six-step waveforms. ...
Theory of Operation 14 2.2.5 Static Bypass A static bypass is an integral part of the UPS. The static bypass consists of a static bypass switch, consisting of two reverse-paralleled SCRs (silicon-controlled rectifiers) per phase and bypass power switching devices (motor-operated circuit breakers). A...
Theory of Operation 15 Transfer and Retransfer Conditions 1. Automatic Transfers to Bypass: Critical bus conditions that will initiate an automatic transfer of the critical load from the UPS inverter output to the bypass source are:a. Output Overload: overcurrent condition in excess of the current v...
Operation 17 3.0 O PERATION 3.1 Display Screen and Operator Controls Each Liebert Series 610 UPS is equipped with a microprocessor-based Operator Control Panel and Display Screen designed for convenient and reliable operation. The locations of operator controls are shown in Figures 3 and 4 . The fro...
Operation 18 Figure 3 Operator controls, typical system Refer also to Figure 2 for a typical system one-line diagram. Item Description Function 1 Input Circuit Breaker (CB1) This manually operated circuit breaker provides power to the UPS module rectifier. It is located in the transformer cabinet of...
Operation 19 Figure 4 Series 610 UPS operator control panel Item Description Function 1 Display Screen This screen displays all vital UPS information in one convenient location. All of the UPS monitoring functions and conditions are indicated here. 2 Up This touch-sensitive pad (button) is used to m...
Operation 20 3.2 Menu Tree Navigation The Operator Interface Display is a blue-background display with white text. The display is always on, but the backlight will remain lit for 15 minutes following any display activation. After 15 minutes, the backlight will go out and the display may appear very ...
Operation 21 Figure 5 illustrates the primary screens that you can access through the Operator Interface Display System. The liquid crystal display (LCD) screen provides a full 80 characters by 25 lines of informa- tion for easy readability. The following sections describe what these screens display...
Operation 22 • System Configuration— This screen displays the current configuration of the UPS system. It also enables the operator to reset the date, time, dial-out phone numbers and System Options. System Options include Temperature-Compensated Charging, Customer Alarm Definitions, Auto Restart an...
Operation 23 3.2.2 Monitor/Mimic Display Screen From Master Menu move the highlighted cursor to MONITOR/MIMIC DISPLAY. Press the Select pad and the Monitor/Mimic screen is displayed. Figure 7 Monitor/Mimic display screen The Monitor/Mimic display screen is a simplified block diagram of the UPS syste...
Operation 24 Status/Alarm Message Areas The status/alarm message areas display vital information about the operation of the UPS system. During normal operation no alarm messages should be present. Changes in the status of the system and possible alarm conditions can be monitored. Both the status and...
Operation 25 Figure 9 Monitor/Mimic display example: Utility fail Figure 10 Monitor/Mimic display example: Load on bypass, UPS module on and charging battery Figure 11 Monitor/Mimic display example: Load on bypass, UPS module off BATTERY VOLTS 480AMPS 645 DISCHARG UPS RATINGS A-B B-C C-A 480V 480V 4...
Operation 26 3.2.3 Walk-In Display Screen From the Master Menu, highlight WALK-IN DISPLAY and then press the Select pad. The Walk-In Display screen enables the operator to monitor the UPS module DC bus voltage, the input currents and the output voltage. This is important during the start-up procedur...
Operation 27 3.2.4 Status Reports Screens Go to the Master Menu and move the highlighted cursor to STATUS REPORTS. Press the Select but- ton and the Status Reports screen is displayed.The Status Report screen is divided into four submenu reports: PRESENT STATUS, EVENT HIS- TORY, HISTORY STATUS and S...
Operation 28 Present Status The Present Status screen shows the current status of the UPS module. This screen displays any alarm messages that are present and the values of the metered parameters for each cabinet.Each update sequence (every 4 milliseconds) is called a frame. The frame number is disp...
Operation 29 History Status The History Status screen displays 64 frames, of 4 milliseconds each, from the Present Status screen. Note that the values for output volts and amps are updated once each millisecond. Alarms are listed in the sequence they occurred, within 1 millisecond resolution. The fr...
Operation 30 System Status The System Status screen displays the module Total Operating Hours, Enable Backlight and the Bat- tery Cycle Monitor. Battery Cycle Monitor Selecting the Battery Cycle Monitor gives you access to detailed information about the module’s most recent battery discharge events....
Operation 31 The Summary screen ( Figure 18 ) shows Total Number of Discharge Cycles, Accumulated Battery Time, Accumulated Battery Amp Hours, Accumulated Battery Kilowatt Hours and Battery Tempera- ture. During a battery discharge event, the screen changes to show information about the present dis-...
Operation 32 3.2.5 System Configuration Screens Go to the Master Menu and move the highlighted cursor to SYSTEM CONFIGURATION. Press the Select pad and the System Configuration screen is displayed. The System Configuration screen lists parameters that can be changed to adjust your UPS module to your...
Operation 33 Maximum Auto-Retransfer Attempts When a UPS output overload condition exceeds a pre-programmed current-versus-time window, the UPS automatically transfers the critical load to the bypass line. After the overload condition has been corrected, the UPS attempts to automatically retransfer ...
Operation 34 Date This is the system’s real-time date setting. To reset the date, do the following:1. From the System Configuration screen, press the Up or Down pad to move the highlighted cursor to DATE . 2. Press the Select pad. The Date screen will appear. 3. Press the Select pad to move the arro...
Operation 35 Time This is the system’s real-time clock. To reset the time do the following:1. From the System Configuration screen, press the Up or Down pad to move the highlighted cursor to Time. 2. Press the Select pad. The Time screen will appear. 3. Press the Select pad to move the arrow to the ...
Operation 36 Auto Dial This is a feature that automatically dials (through a customer supplied PC-compatible modem) a pre- programmed telephone number (up to 12 digits) when specified alarm conditions occur within the UPS system. Automatic dial attempts to the first number are made at periodic inter...
Operation 37 Language Selection English and Portuguese are supported. System Options This screen enables and disables optional features which might or might not be installed in your UPS. The options are Customer Alarm Interface, Battery Exercise, Temperature-Compensated Battery Charging, Automatic R...
Operation 38 Figure 26 Battery test screen Figure 27 Battery test results screen Continuous Duty Static Switch (Optional) This feature requires installation of a Customer Alarm Interface board. When the CDSS feature is enabled and the Customer Alarm Interface option is installed and enabled, the mim...
Operation 39 Remote Monitor The Remote Monitor Panel (optional) displays eight (8) alarms. These alarms are also available for customer use through a set of contacts on a separate terminal board. The following alarms, as well as those listed above, will activate the System Summary Alarm.When the New...
Operation 40 3.2.6 Alarm Limit Settings Screen Go to the Master Menu and move the highlighted cursor to LIMIT SETTINGS. Press the Select pad and the Limit Settings screen is displayed.The Alarm Limit Settings screen has Security Access to enable an authorized Liebert field-service engineer to adjust...
Operation 41 Battery Shutdown (60 Minutes) During extended outages or deep sags of more than 15 minutes, the shutdown voltage limit will ramp up gradually to this 60-minute limit to prevent lengthy discharge and possible battery damage. The battery circuit breaker opens when the battery voltage and ...
Operation 42 3.2.7 Load Transfer Procedures Screen Go to the Master Menu and move the highlighted cursor to LOAD TRANSFER PROCEDURES. Press the Select pad and the Load Transfer Procedures screen is displayed. Figure 30 Load transfer procedure screen The Load Transfer Procedures screen contains instr...
Operation 43 3.2.8 Start-Up Procedures Screen From the Master Menu, move the highlighted cursor to START-UP PROCEDURES. Press the Select pad and the Start-Up Procedures screen is displayed.This two-page screen contains the steps you must follow to start-up the UPS system. The instructions are listed...
Operation 45 Figure 35 Battery time screen (15-minute discharge) The screen also displays alarm messages (Battery Discharging, Low Battery Warning and Battery Shutdown) and a set of five parameters that inform the operator of battery condition and time remaining. The five parameters describing batte...
Operation 46 The Battery Time Remaining graph and the Calculated times are extremely helpful to the operator who has the discretionary authority to order load-shedding activities. The Series 610 automatically samples battery voltage and load current and recomputes every six seconds. This gives the o...
Operation 47 If the Battery Time screen is displayed while the battery is not discharging, it will display the present Battery Charge percentage and the results of the previous discharge event. The Series 610 records information about each discharge event. If your system has the Battery Cycle Monito...
Operation 48 3.2.12 Battery Equalize Screen Go to the Master Menu and move the highlighted cursor to BATTERY EQUALIZE . Press the Select pad and the Battery Equalize screen is displayed. Figure 39 Battery equalize screen The Battery Equalize screen enables the operator to adjust the battery equalize...
Operation 49 3.2.13 Alarm and Status Messages Status Messages The status messages indicate whether the static bypass switch is connected or disconnected. The sta- tus messages also advise the operator when a transfer or retransfer between the UPS and bypass line is permitted, based on matching volta...
Operation 50 Alarm Messages The alarm message area displays the alarm conditions that are present within the UPS system. Alarm messages are displayed in flashing reverse video. During normal operation no alarm messages should be present. Up to four messages are displayed. To see if any additional al...
Operation 51 Table 4 Alarm messages and corrective actions Alarm Message Special Functions Meaning and Corrective Action AC INPUT Input fail The rectifier input line voltage is outside of specified limits or the input circuit breaker is opened while the battery circuit breaker remains closed. The ba...
Operation 54 Table 5 Alarm messages—summary Alarm Message Special Functions Input FailDC Ground Fault D, L, S DC Capacitor Fuse Blown D, F, S Battery CB Open D, S Battery Discharging D, R, S Low Battery Warning D, R, S Low Battery Shutdown D, F, L, S Battery Overtemp (optional) D, S DC Overvoltage S...
Operation 55 3.2.14 Communication Interfaces Your Liebert Series 610 UPS can be configured with the following communication ports: • Worldwide reporting to a remote terminal through a modem• Reporting to a local terminal (no modem required)• Reporting to a local monitor only• Site reporting to Liebe...
Operation 56 Requesting Information If your Series 610 is equipped with a modem and telephone line, you can call the UPS and receive sys- tem status and historical information on discharge events. You can place the call from either a remote terminal or a personal computer with a communications progr...
Operation 57 Remote Monitor Panel The Liebert Remote Monitor Panel provides an LED indication of the following conditions: • Load On UPS• Load On Bypass• Battery Discharge• Low Battery Warning• Overload• Ambient Overtemp• System Summary Alarm• New Alarm This information is also available for custome...
Operation 58 3.3 Modes of Operation This section illustrates the flow of power through circuit breakers, switches and UPS components dur- ing various modes of operation. The same modes of operation apply to all configurations of the Liebert Series 610 UPS. Highlighted (thick) lines in the diagrams i...
Operation 59 3.3.2 OK to Transfer The OK to Transfer status message will be displayed when the bypass line and UPS output power are both available, their voltage, frequency and phase synchronization are matched within specifications, and the Static Switch Disconnects are closed (ON). An alarm messag...
Operation 60 Figure 43 Load on UPS (bypass available) OUTPUT CB Controls Battery Bypass CB INPUT CB Static Bypass Switch RIB BFB Critical Load AC Output MBD Static Switch Disconnects THREE BREAKER MAINTENANCE BYPASS SWITCHBOARD CONTROL POWER UPS MODULE MAIN INPUT SWITCHGEAR Rectifier/ Charger Invert...
Operation 62 3.3.4 Input Power Failure—Load on Battery If the utility AC power source fails or is outside the acceptable range, the battery plant becomes the power source for the UPS module inverters. The UPS system continues to supply power to the critical load and also to the UPS controls.You can ...
Operation 63 3.3.5 Off Battery The battery plant can be disconnected from the UPS, if required for battery maintenance, by opening the module battery disconnect (MBD) circuit breaker. In this situation the UPS module will continue to supply conditioned power to the critical load, but if input power ...
Operation 64 3.3.6 Emergency Module Off The Local Emergency Module Off (LEMO) mode is used to remove power from nearly all UPS module components, and the critical load will continue to be supplied through the bypass line.The Emergency Module Off control is a guarded pad on the UPS Control Panel ( Fi...
Operation 65 3.3.7 Remote Emergency Power Off The Remote Emergency Power Off (REPO) mode is used to remove all power from the critical load.The Remote Emergency Power Off control is a user-provided switch located remotely from the UPS system. It will normally be in the same room as the critical load...
Operation 66 3.3.8 Module Shutdown Perform a Module Shutdown procedure when you must disconnect the UPS system components from all power sources when required for maintenance procedures.Use the Shutdown Procedures screen when performing a manual System Shutdown.Refer to 3.4.4 - Shutdown Procedures ....
Operation 67 3.3.9 Maintenance Bypass Maintenance Bypass switchgear allows you to totally isolate the UPS from all power sources, while you maintain power to the critical load.Your installation may have a two-breaker or three-breaker maintenance bypass or none at all. The main difference between a t...
Operation 68 Figure 51 Load on maintenance bypass (three breakers) STANDBY GENERATOR AUTOMATIC TRANSFER SWITCH Critical Load AC Output RIB MBD BFB OUTPUT CB Controls Battery Bypass CB INPUT CB Static Bypass Switch Static Switch Disconnects THREE BREAKER MAINTENANCE BYPASS SWITCHBOARD CONTROL POWER U...
Operation 69 3.4 Manual Procedures The Liebert Series 610 UPS is designed to function while unattended by an operator. Many important functions are handled automatically by the system control logic, as explained in 3.5 - Automatic Operations . Other procedures must be performed manually. Manual proc...
Operation 70 STEP 1 (Start-Up Procedure) Before you apply power to the UPS modules, determine the position of the following circuit breakers and switches: a. Rectifier Input Breaker (RIB) - If this external circuit breaker is closed, you already have power to the UPS cabinet and possibly power to th...
Operation 71 STEP 3 (Start-Up Procedure) During a start-up procedure, power is supplied to the critical load through the internal bypass line while the UPS module is being energized. Depending on the reason for your UPS module shutdown, you may already have power through the bypass line. You can det...
Operation 72 STEP 4 (Start-Up Procedure) a. Press the Select pad to put the Master Menu on the LCD. Move the highlighted cursor to Start-Up Procedures (use the Up and Down pads). Press the Select pad to display the Start- Up Procedures screen ( Figure 52 ). Return to this screen whenever you need to...
Operation 73 STEP 5 (Start-Up Procedure) When the Module DC Bus voltage is at 100%, you can manually close the module battery disconnect (MBD) circuit breaker (external to the UPS). The Battery block in the Monitor/Mimic Display indicates the battery voltage and charge current. Use the Monitor/Mimic...
Operation 74 3.4.2 Load Transfer Procedures Use the Monitor/Mimic Display to determine the operating condition of the UPS module. Press the Alarm Reset pad to clear the Alarm Messages. Refer to Table 4 for an explanation of any remaining alarm messages (except Load On Bypass). Call Liebert Global Se...
Operation 75 3.4.3 Maintenance Bypass Load Transfers To manually transfer the load between Maintenance Bypass and the UPS bypass line, carefully follow these instructions. Do not transfer the load between Maintenance Bypass and the UPS module (inverter) output. Use the Monitor/Mimic Display screen t...
Operation 76 3.4.4 Shutdown Procedures Module Shutdown Procedure Perform a Module Shutdown Procedure when you want to remove power from a UPS module when required for maintenance.Before performing any maintenance on your Liebert Series 610 UPS, observe ALL of the WARNINGS in 4.0 - Maintenance . Use ...
Operation 79 3.5 Automatic Operations The Liebert Series 610 UPS system is designed to function while unattended by an operator. The sys- tem control logic monitors the performance of the UPS, the availability of power sources and the cur- rent required by the critical load.The system control logic:...
Operation 80 3.5.2 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. Load On Bypass is illustrated ...
Operation 81 3.5.4 Automatic Transfers to Bypass (UPS System Faults) For specified UPS system faults, the control logic will initiate an automatic transfer to bypass fol- lowed immediately by a shutdown and isolation of the UPS system. The output, battery (MBD) and input circuit breakers are open. T...
Operation 82 3.5.5 Automatic Restart (Optional) Starting and restarting the Series 610 is normally a manual procedure. However, for some unat- tended sites, it is desirable to enable the module to restart itself and retransfer the load back to UPS power following an extended utility outage.When the ...
Maintenance 83 4.0 M AINTENANCE 4.1 Safety Precautions Observe the safety precautions in Important Safety Instructions on page 1 and in 1.3 - Safety Precautions . ONLY qualified service personnel should perform maintenance on the UPS system. Observe ALL of the WARNINGS below before performing ANY ma...
Maintenance 84 4.2 Liebert Global Services Start-up, UPS maintenance, battery maintenance and training programs are available for the Series 610 UPS through your Liebert sales representative. Professional Start-Up UPS Start-Up - Liebert’s Customer Engineers perform a thorough non-powered inspection ...
Maintenance 85 4.3 Routine Maintenance You are encouraged to 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 malfunc- tion. If you have any doubt as to what must be done, call Liebe...
Maintenance 87 4.4 Battery 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 typ...
Maintenance 88 Battery Safety Precautions In French Per CSA RequirementsInstructions Importantes Concernant La SécuritéConserver Ces Instructions ! AVERTISSEMENT Respecter toutes les consignes de sécurité applicables à l'installation, le chargement ou l'entretien des batteries. En plus du danger de ...
Maintenance 89 Regular maintenance of the battery module is an absolute necessity. Periodic inspections of battery and terminal voltages, specific gravity and connection resistance should be made. Strictly follow the procedures outlined in the battery manufacturer’s manual, available on the manufact...
Maintenance 90 If you have a different model battery, contact Liebert Global Services for the required torque value. To access battery cell terminals, disconnect the inter-tier cable and two shelf retaining screws. Once disconnected, insulate (with protective boot or electrical tape) the cables to p...
Maintenance 91 4.4.2 Torque Requirements All electrical connections must be tight. Table 10 provides the torque values for the connections in the UPS. Use these values unless the equipment is labeled otherwise. 4.5 Detection of Trouble It is important that the operator check the instrument readings ...
Maintenance 92 4.6 Reporting a Problem If a problem occurs within the UPS, review all alarm messages along with other pertinent data. This information should be given by telephone to the Liebert service representative’s office nearest you. This information can be downloaded to Liebert Global Service...
Specifications 93 5.0 S PECIFICATIONS 5.1 Rating The kVA and kW ratings and the nominal voltages and currents for continuous operation are listed on the unit nameplates (inside Operator Control Panel door) and on the System One-Line Diagram. The rated output power envelope of the UPS is illustrated ...
Specifications 94 5.2 Environmental Conditions Table 12 Specifications applicable to environment Enclosure The UPS is housed in a NEMA-1 enclosure. The enclosure is designed for indoor use only and is not to be subjected to falling objects or precipitation. Recommended Operating Temperature 25°C amb...
Specifications 95 5.3 Adjustments All adjustments are set at the factory or during start-up and normally do not have to be field read- justed. • Input Current Limit: Normal, 115%; on generator, 100%• Battery Charge Current Limit: Normal, 10%; on generator, 1%• Battery Equalize Charge: Set at start-u...
Specifications 96 5.5 Electrical Specifications RECTIFIER INPUT Input Voltage Standard voltages for 100 - 450kVA units: 208, 480 and 600VAC Standard voltages for 500 - 1000kVA units: 480 and 600VAC Other voltages available on request. 3-phase, 3-wire plus ground. Voltage Range +10%, -15% (no battery...
The Company Behind the Products With over a million installations around the globe,Liebert is the world leader in computer protectionsystems. Since its founding in 1965, Liebert hasdeveloped a complete range of support andprotection systems for sensitive electronics: • Environmental systems—close-co...
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