Liebert NX series Operation & Maintenance Manual
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Liebert NX series Operation & Maintenance Manual

10-30kva 208v, 60hz
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P
A
OWER
VAILABILITY
NX™ UPS
O
& M
M
PERATION
AINTENANCE
ANUAL
10-30kVA
208V, 60Hz

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Summary of Contents for Liebert NX series

  • Page 1 OWER VAILABILITY NX™ UPS & M PERATION AINTENANCE ANUAL 10-30kVA 208V, 60Hz...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS ...........1 ENERAL ESCRIPTION Introduction .
  • Page 4 ............. 24 PTIONS Communication and Other User Terminals .
  • Page 5 FIGURES Figure 1 Single module block diagram (dual input configuration) ....... . . 1 Figure 2 Overview of control panel .

  • Page 7: General Description

    The standard Liebert NX consists of the UPS and internal batteries in a compact, single cabinet. As shown in Figure 1, the AC utility source is input at CB1 and the rectifier converts the AC utility into DC power.

  • Page 8: Bypass Supplies

    General Description 1.1.1 Bypass Supplies The circuit block labeled “Static Switch” and “Contactor” in Figure 1 contains an electronically con- trolled switching circuit that enables the critical load to be connected to either the inverter output or to a bypass power source via the static bypass line. During normal system operation the load is con- nected to the inverter and the inverter contactor is closed;...
  • Page 9 General Description Maintenance Mode For maintenance or repair, the NX may be operated in maintenance mode. To place the NX in mainte- nance mode, the load must be transferred to bypass and the inverter must be turned off. When those conditions are met, the rotary switch may be turned to MAINT and the UPS may be shut down, per- mitting disconnecting the batteries for maintenance.

  • Page 10: Operator Control And Display Panel

    • Liquid Crystal Display (LCD) and Navigation keys - view status and operational data from the NX in tabular format • Control buttons - turn the NX on or off, silence alarms Figure 2 Overview of control panel 2003-01-22 12:30:36 Liebert NXb Mimic display Unit #1 Norm al 30KVA-3X3 Main Bypass...

  • Page 11: Mimic Display Indicators

    UPS power, as shown in Figure 4. Figure 4 Mimic display indicators location Mimic indicators 1. Rectifier indicator 2. Battery indicator 2003-01-22 12:30:36 Liebert NXb 3. Bypass indicator Unit #1 Norm al 30KVA-3X3 4. Inverter indicator Main Bypass Output 5.

  • Page 12: Control Buttons

    Table 2. NOTE To activate a button properly, press and hold until you hear a short beep—about two seconds. Figure 5 Location of control buttons 2003-01-22 12:30:36 Liebert NXb Unit #1 Norm al 30KVA-3X3 Main Bypass Output...

  • Page 13: Lcd Overview

    The LCD displays alarm information in real time. After appearing in the current status section of the LCD, status messages are stored in the history log—512 records can be stored and retrieved. Figure 7 Sections of the LCD Liebert NXb 2004-01-22 12:30:36 UPS system...

  • Page 14: Navigation Keys

    UPS System Information The UPS system information displayed at the top of the LCD is detailed in Table 4. Table 4 Description of items in UPS system window Item Type Explanation Liebert NXb UPS name 2002-10-12 Current date 12:30:36 Current time 030 means UPS model is 30kVA;...

  • Page 15: Lcd Menus And Data Items

    Operator Control and Display Panel LCD Menus and Data Items The LCD menus provide access to the following categories of information and settings for the UPS. Selecting a menu changes the information displayed in the UPS data items portion of the LCD. The menu choices are listed below and described in detail in Table 5.

  • Page 16: Language Selection

    Operator Control and Display Panel Language Selection The LCD menus and data display is available in Liebert NXb 2004-01-22 12:30:36 12 languages. To select a different language: 30kVA-3X3 Single Normal • From the main menu, press the F1 (shift) key...

  • Page 17: Table 5 Descriptions Of Ups Menus And Data Window Items

    Operator Control and Display Panel Table 5 Descriptions of UPS menus and data window items Menu Type Item Type Explanation L-N voltage (V) Phase voltage L-N current (A) Phase current Mains Frequency (Hz) Input frequency (input) L-L voltage (A) Line-line voltage Power factor Power factor L-N voltage (V)

  • Page 18: Ups Status Messages

    • History Log: When a record moves to the history log, the time the status changed is recorded. The history log can hold up to 512 records. History log records may be viewed by accessing the Records menu. Figure 9 Current status and history log records Liebert NXb 2004-01-22 12:30:36 30kVA-3X3 Single...

  • Page 19: Types Of Lcd Screens

    HELP 2.12.2 Default Screen After the UPS has powered up and completed a self-test, the output screen appears, as shown in Figure 11. This window is the default screen. Figure 11 Default screen Liebert NXb 2004-01-22 12:30:36 30kVA-3X3 Single Normal...

  • Page 20: Ups Help Screen

    If there has been no interaction with the NX’s LCD for 2 minutes, the screen saver window appears. It remains on the LCD for 2 minutes, then the screen will go dark. The LCD will become active again when any key is pressed. Figure 13 Screen saver window Liebert NXb 2004-01-22 12:30:36 30kVA-3X3...

  • Page 21: Pop-Up Windows

    Operator Control and Display Panel 2.13 Pop-Up Windows Pop-up prompt windows appear when the user must confirm a choice or perform an operation. This section describes the pop-up windows. 2.13.1 From Bypass to Inverter Mode With Power Interruption If the bypass voltage or frequency exceeds the synchronized range and utility voltage or frequency is normal, the inverter cannot be in Transfer with Interrupt, synchronization with the bypass, and the output can only transfer...

  • Page 22: Operating Instructions

    NOTE This unit refers to some modes and conditions that are set or adjusted using proprietary service software. To take advantage of all the available features for the NX, the unit must be commissioned by a Liebert factory-trained service engineer.

  • Page 23: Power Switches

    Operating Instructions 3.1.1 Power Switches The UPS can be isolated by means of power switches, mounted inside the cabinet and accessible after opening the front door. The location of the UPS power switches is shown in Figure 14. Figure 14 Power switches - 10kVA NX CB1 - Utility Connection Inside the door,...

  • Page 24: Ups Start-Up

    Operating Instructions UPS Start-Up The NX must be fully installed and commissioned before startup, and external power isolators must be closed. Once those general conditions are met, the UPS may be started. 3.2.1 Start-Up Procedure To start the UPS from a fully powered-down condition: 1.

  • Page 25: Verify Switching Between Operation Modes

    Operating Instructions 4. Turn the rotary switch to BYPASS. Indicator State Rectifier indicator Green Battery indicator Bypass indicator Green Inverter indicator Load indicator Green Alarm indicator Amber The maintenance switch SW1-D opens and output switch SW1-A closes. The UPS powers from static bypass instead of from maintenance bypass.

  • Page 26: Switching The Ups From Normal To Maintenance Bypass

    Operating Instructions Switching the UPS from Normal to Maintenance Bypass Follow the procedure below to transfer the load from the inverter output to the Maintenance Bypass line of the UPS. CAUTION Before performing this operation, read the messages on the LCD to be sure that bypass supply is regular and the inverter is synchronous with it.

  • Page 27: Powering Down The Ups And Maintaining Power To Load

    Operating Instructions Powering Down the UPS and Maintaining Power to Load NOTE An external Maintenance Bypass Cabinet must be installed before attempting to perform the following procedure. If the UPS needs to be shut down completely while maintaining power to the load, follow these steps: 1.

  • Page 28: Figure 15 Typical Configuration For Single Ups With External Maintenance Bypass Cabinet

    Operating Instructions Figure 15 Typical configuration for single UPS with external Maintenance Bypass Cabinet Input distribution QinUPS QINextBYP Supplied by others Input mains Bypass mains Ext bypass supply supply mains U1/V1/W1 U3/V3/W3 Battery circuit breaker 1 Rectifier Battery 1 Inverter Static switch Q3BP...

  • Page 29: Emergency Shutdown With Epo

    Operating Instructions Emergency Shutdown With EPO This circuit has been designed to switch off the UPS in emergency conditions (i.e., fire, flood, etc.). The system will turn off the rectifier, inverter and stop powering the load immediately (including the inverter and bypass), and the battery stop charging or discharging. Auto Restart When main and bypass sources fail due to utility power failure, the system will operate on battery continuously until shut down due to battery end of discharge (EOD).

  • Page 30: O Ptions

    The NX UPS contains three Intellislot communication slots to allow the operator to field install optional communication cards. Each bus can independently communicate via Liebert ESP2 protocol, and cards that translate the information on the bus to the specific protocol needed: Modbus / Jbus, SNMP, IGMnet and serial port card.

  • Page 31: Figure 16 Options Diagram

    Options LBS Mode (Load Bus Synchronization) The function of LBS is to keep the output of two independent UPS systems (single unit or multiple unit) in synchronization even when the two systems are operating in different modes (bypass/ inverter) or on batteries. It is usually used with an STS (Static Transfer Switch) connected to the crit- ical load to achieve dual bus configuration.
  • Page 32 Options...

  • Page 33: Table 8 Ups Status Messages

    UPS Status Messages A - UPS S PPENDIX TATUS ESSAGES Table 8 shows all event messages as they appear in the current status area of the LCD or the history log, along with a description and recommended actions, if any. For further information on the current status area and the history log, see 2.11 - UPS Status Messages.
  • Page 34 UPS Status Messages Table 8 UPS status messages (continued) Event Message Description / Suggested Action (if any) The temperature of heat sink is too high to keep the rectifier running. Rectifier Overtemp. Suggested Action The UPS can recover automatically. Check the environment and ventilation. The difference voltage between the bus+ and bus- is above 50V.
  • Page 35 UPS Status Messages Table 8 UPS status messages (continued) Event Message Description / Suggested Action (if any) This alarm is triggered by an inverter software routine when the amplitude or frequency of bypass voltage exceeds the limit. The amplitude and frequency limit of bypass voltage are set via the configuration software (By default, +15% as maximum amplitude, -20% as minimum amplitude, ±10% as frequency range).
  • Page 36 UPS Status Messages Table 8 UPS status messages (continued) Event Message Description / Suggested Action (if any) The temperature of the output filter inductor is too high to keep inverter running. This alarm is triggered by the signal from a thermostat mounted in the output filter inductor. The UPS would recover automatically after a 5 minute delay from the disappearance of the over temperature signal.
  • Page 37 UPS Status Messages Table 8 UPS status messages (continued) Event Message Description / Suggested Action (if any) At least one of the static switches of bypass side is open or short circuit. This fault is locked until power off. This fault is triggered when the output voltage or the output current satisfies one of the following conditions: 1.
  • Page 38 UPS Status Messages Table 8 UPS status messages (continued) Event Message Description / Suggested Action (if any) Control Power 2 is abnormal or lost. This alarm is triggered by a detection circuit on the M4 measure board, which monitors the second control power board. Suggested Action Confirm that the alarm is true by checking the output voltage of the second control power board.
  • Page 39 UPS Status Messages Table 8 UPS status messages (continued) Event Message Description / Suggested Action (if any) 1. When inverter overload times out and bypass is abnormal, the inverter will turn off and the output will shutdown. 2. When bypass goes abnormal during the 5 minutes span just after an overload transfer from inverter side.
  • Page 40 UPS Status Messages Table 8 UPS status messages (continued) Event Message Description / Suggested Action (if any) Shut off inverter due to abnormal DC bus voltage. DC Bus Abnormal Suggested Action Check whether there is fault in rectifier side, if no, then check whether overload occurs. The whole paralleled UPS system transferred to bypass at the same time.
  • Page 41 UPS Status Messages Table 8 UPS status messages (continued) Event Message Description / Suggested Action (if any) Unit Off Confirm Unit Turned Off Confirm System Off Confirm Parallel System Turned Off Confirm Fault Reset Fault Rest Alarm Silence Alarm Silence Turn On Fail Turn On Fail Alarm Reset...
  • Page 42 UPS Status Messages...
  • Page 44 The Company Behind the Products Technical Support/Service Web Site With over a million installations around the globe, www.liebert.com Liebert is the world leader in computer protection Monitoring systems. Since its founding in 1965, Liebert has 800-222-5877 developed a complete range of support and monitoring@liebert.com...

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