Liebert NX UPS System user manual Verify Switching Between Operation Modes

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Operating Procedures

5.Turn the rotary switch to NORMAL, then press the INVERTER ON control button for 2 seconds. The inverter will start and the inverter indicator will flash green. After the inverter is ready, the UPS transfers from bypass to inverter, the bypass indicator turns off and the inverter and load indicators turn on.

The UPS is operating normally. The UPS mimic display indicators will:

Indicator	State
Rectifier indicator	Green
Battery indicator	Off
Bypass indicator	Off
Inverter indicator	Green
Output indicator	Green
Status indicator	Green

6.2.2Verify Switching Between Operation Modes

Switch from normal mode to battery mode

•Open CB1 to enter battery mode. This breaks the utility connection to the NX.

To return to normal mode, wait a few seconds and close CB1. The rectifier will restart automati- cally after 10 seconds and resume feeding power to the inverter.

Switch from Normal Mode to Bypass Mode

• Press INVERTER OFF button to switch to bypass mode.

NOTE

In bypass mode, the load is being powered by the utility and is not receiving conditioned power through the inverter.

Switch from Bypass Mode to Normal Mode

•Turn the rotary switch to NORMAL.

•In bypass mode, press the INVERTER ON button. When the inverter is ready, the UPS will switch to normal mode.

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Contents Liebert NX UPS Page Table of Contents Dual Bus System UPS MULTI-MODULEINSTALLATIONOperator Control Panel and Display Operating ProceduresOPTIONS-FORASSEMBLY Inside the UPS Cabinet Technical SpecificationsFigures Tables Options Model Identification Feature Set for Region InputOutput Aust/NZConformity and Standards Safety PrecautionsBattery Voltage Exceeds 400VDC User-Serviceable PartsPreliminary Checks IntroductionStorage External Battery RoomLocation UPS RoomMoving the Cabinets PositioningSystem Cabinets 2 10 to 30kVA UPSExternal Protective Devices Earth Leakage RCD External BatteryUPS Output Maximum steady state AC and DC currents Power CablesDistance from floor to connection point on the equipment Common Input Connections Cable TerminationOutput System Connections Control Cables and Communication Monitor Board FeaturesInput Dry Contacts X3 Ancillary Control and AlarmsMaintenance Bypass Cabinet Interface Dry ContactsJumper connection for BCB interface External Circuit-Breaker InterfaceJ28 Output Dry ContactsOutput dry contact relays +12V J13 J21X6 Analog Input Interface Emergency Power Off InputX5 Auxiliary DC Power Output X7 External Battery Temperature Detector InterfaceSerial Ports RS232-1 and RS232-2 External Bypass Switch InterlockBattery Start Facility Battery Start ButtonBattery Installation Hazardous battery voltage present behind covers SafetyBattery Cabinet Name W2 L=5m Name W1 L=30m Battery Temperature Sensor OptionalMoving the Battery Cabinets Cable W2 is packed with the temperature sensorGeneral Arrangement Drawings Battery cabinet bottom cable entry locationBottom cable entry Battery cabinet internal layout Connection Principles Battery Power CablesItem # Item Name Fitting the Batteries Battery ControlConnecting the Battery Battery Room DesignX21 GeneralX23 X24 Monitor Board X24Paralleled UPS Modules Cabinet InstallationDistribution Cabinet External Protective Devices Power CablesControl Cables Intermodule Control Hot-Standby UPS ModulesInput Distribution Upstream Dual Bus System Parallel Board DBS Cable X2-2 X1-1 Parallel System Control WiresExtended Dual Bus Synchronization Option DBS Interface Box Parallel Board X2-2 X1-1 Parallel SystemInstallation Drawings General arrangement-10-30kVA UPS module External Battery Input Output Main Input Bypass Input NXe 10-30kVA Top View Internal battery layout and connecting-GP12120 F2 12AH/12V Internal battery layout Split-Bypass Input Battery Temperature Compensation Static Transfer SwitchMulti Module UPS-1+N Redundant Control Power Supply BoardSocket Outlet Modes of Operation Parallel Redundancy Mode System Expansion Bypass ModeMaintenance Mode Manual Bypass ECO Mode Single UPS OnlyBattery Protection settings by commissioning engineer Battery Management-Set During CommissioningNormal Function Rotary switch configurations Power SwitchesUPS operating modes Indicator State Start-Up ProcedureUPS Startup Verify Switching Between Operation Modes Powering Down the UPS Switching the UPS from Normal to Maintenance BypassPowering Down the UPS and Maintaining Power to Load Auto Restart Emergency Shutdown With EPOLanguage Selection Command PasswordChanging the Current Date and Time Isolating One Module in a Multi-Module System LED Function Status Inserting One Module into a Multi-Module SystemComponent # Function UPS control and display panel componentsButton Function Audible Alarm Buzzer Mimic Power FlowLCD Monitor and Menu keys Direct Access Push Buttons KeysMenu key Icons and their meaning Displayed on the front LCD. When not activated, Load System Battery RecordsLanguage Settings Command Version When configured, input transformer voltages areMenu Type Item Type Explanation Detailed Description of Menu ItemsUPS system window Descriptions of UPS menus and data window itemsNumber to be dialed to send an alarm notification Message Description / Suggested Action if any UPS messagesBypass voltage exceeds the limit UPS is confirmed to overload and the overload times out UPS messages Prompt Meaning Dynamic Energy Flow Chart and UPS Help ScreenPrompt Pop-Up Windows Prompt windows, meaningsDefault screen Default Screen SaverProtection Battery Ground Fault DetectionTerminal Name Definition AC Fan Redundant Fan for Power ModuleFan120 Fan120OC Web Card data summary window OC Web Card SNMP/HTTP Network Interface CardRelay card jumpers Relay Card pin configurationRelay Card Multiport-4 CardAssignment SiteNet MultiPort4 Intellislot pin assignmentPin Description OC485 Web Card Modbus, Jbus, IGM Net Remote Alarm MonitorDust Filter for 10-30kVA Dust filter replacementOverall efficiency, heat losses and air exchange Environmental characteristicsConformity and Standards Compliance with European, international standardsRectifier AC input mains Mechanical characteristicsInverter output to critical load Bypass mains input Technical Specifications Technical Specifications Page That Ne tIti Ti n