Liebert GXT 2U user manual Battery Charger, DC to DC Converter, Dynamic Bypass

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Major Components

3.4BATTERY CHARGER

The battery charger utilizes energy from the utility power and pre- cisely regulates it to continuously “float charge” the batteries. The bat- teries are being charged whenever the UPStation GXT 2U is plugged in, even when the UPS is not turned on.

3.5DC TO DC CONVERTER

The DC to DC converter utilizes energy from the battery system and raises the DC voltage to the optimum operating voltage for the inverter. This allows the inverter to operate continuously at its opti- mum efficiency and voltage, thus increasing reliability.

3.6BATTERY

The UPStation GXT 2U utilizes valve-regulated, nonspillable, flame retardant, lead acid batteries. To maintain battery design life, operate the UPS in an ambient temperature of 68°F to 77°F (20°C to 25°C). Optional external battery cabinets are available to extend battery run times.

3.7DYNAMIC BYPASS

The UPStation GXT 2U provides an alternate path for utility power to the connected load in the unlikely event of a UPS malfunction. Should the UPS have an overload, overtemperature, or UPS failure condition, the UPS automatically transfers the connected load to bypass. Bypass operation is indicated by an audible alarm and illuminated amber Bypass LED (other LEDs may be illuminated to indicate the diag- nosed problem). To manually transfer the connected load from the inverter to bypass, press the Standby button once.

NOTE

The bypass power path does NOT protect the connected equipment from disturbances on the utility supply.

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Contents Power Availability UPStation GXT 2UPage Table of Contents Tables Important Safety Instructions Page Glossary of Symbols Introduction Transient Voltage Surge Suppression Tvss EMI/RFI Filters RECTIFIER/POWER Factor Correction PFC CircuitMajor Components InverterDC to DC Converter Battery ChargerBattery Dynamic BypassGXT 2U Rear View Tower UPS Installation InstallationPreparation RACK-MOUNT UPS Conversion and Installation Bracket assembly into rack Prepare the UPS or battery Cabinet the equipment for UPS External Battery Cabinet Installation Controls and Indicators ON/ALARM SILENCE/MANUAL Battery Test ButtonBypass Indicator LED Amber LOAD/BATTERY Level Indicators 4 GREEN, 1 AmberFault Indicator LED RED Battery Indicator LED AmberAC Input Indicator LED Green Output Voltage SelectionBypass Mode Operation Normal Mode OperationOperating Instructions Battery Mode Operation Battery Recharge ModeCommunications Communications Interface PortPins 4 & 5 Remote Shutdown on Battery Auto-Enable Output Pin 6 Logic Pins 5 & 6 ANY-MODE ShutdownUPS Intelligent Communications Configuration Program GXT 2U Configuration Program AbilitiesMaintenance Battery ReplacementInternal Battery Replacement Procedures Fuse Replacement Troubleshooting AC LEDTroubleshooting guide Check load equipment for Your UPS has received a Alarm conditions Specifications Model RatingGXT2-1500RT120 GXT2-2000RT120 GXT2-3000RT120 Battery Cabinet Specifications Battery ParametersBattery RUN Times Product Warranty Registration Page Page Page Company Behind the Products