Emerson GXT4 User's Guide Page 14
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Product Description
Liebert
®
GXT4
™
8
1.4 Major Components
The operating principle of the UPS is illustrated in Figure 7.
Figure 7 Operating principle diagram
The UPS is composed of utility input, TVSS and EMI/RFI filters, rectifier/PFC, inverter, battery
charger, DC-to-DC converter, battery, dynamic bypass and UPS output.
Transient Voltage Surge Suppression (TVSS) and EMI/RFI Filters
The Liebert GXT4 has surge protection and filters that protect the connected load from power surges,
electromagnetic interference (EMI) and radio frequency interference (RFI). These features can
minimize any surges or interference present in the utility power. The filters also prevent surges or
interference generated by the UPS from adversely affecting devices connected on the same branch as
the UPS.
Rectifier/Power Factor Correction (PFC) Circuit
In normal operation, the Liebert GXT4’s rectifier/power factor correction (PFC) circuit converts utility
power to regulated DC power for use by the inverter while ensuring that the wave shape of the input
current used by the UPS is near ideal. Extracting this sinewave input current achieves two objectives:
• Efficient power use by the UPS
• Reduced reflected harmonics
This results in cleaner power being available to other devices in the building not being protected by
the Liebert GXT4.
Inverter
In normal operation, the Liebert GXT4’s inverter utilizes the DC output of the PFC to produce
precise, regulated sine wave AC power. When utility power fails, the inverter receives DC power from
the DC-to-DC Converter. In either operation mode, the UPS inverter is online, continuously
generating clean, precise, regulated AC output power.
Battery Charger
The battery charger utilizes energy from the utility power and precisely regulates it to continuously
float charge the batteries. The batteries are being charged whenever the Liebert GXT4 is plugged in,
even when the UPS is not turned On.
TVSS
EMI/RFI
Input
Filter
Inverter
DC-DC
Converter
Battery
Charger
Battery
Dynamic
Bypass
L
G
N/L2*
G
L
Programmable
Outlet
Group 1
General
Outlet
Group
Programmable
Outlet
Group 2
General
Outlet
(3000 VA Only)
N/L2*
EMI/RFI
Output
Filter
* NOTE: ONLY the GXT4-3000 RT208 model (208V) requires L 2 (L6-20P).
All other models covered in this manual are 120 V L-N wired
Rectifier/
PFC
- UPS 120V/208V 500VA-3000VA 1
- TABLE OF CONTENTS 3
- SAVE THESE INSTRUCTIONS 7
- Battery Safety 8
- GLOSSARY OF SYMBOLS 9
- 1.0 PRODUCT DESCRIPTION 10
- 1.3 Appearance and Components 11
- 1.4 Major Components 14
- 1.5 Operating Mode 15
- 1.5.3 Battery Mode 16
- 1.5.4 Battery Recharge Mode 16
- 1.5.6 Active ECO Mode 16
- 2.0 INSTALLATION 17
- 2.4 Mechanical Installation 18
- 2.4.2 Rack Installation 19
- 2.5 Cable Connection 20
- Installation 21
- 15 Liebert 21
- 3.1 LED Indicators 22
- 3.2 Control Buttons 23
- 3.4 Menu Structure 24
- Network Power 25
- 3.4.2 Default Screen 26
- 3.4.3 Main Menu Screen 26
- STATUS Screen 27
- CONFIGURATION Screen 27
- UPS Screen 28
- Battery Screen 28
- 1 OUTLET CONTROL 29
- 2 OUTLET SETTING 29
- OUTLET CONTROL 30
- TURN OFF 30
- Outlet2 Screen 31
- LCD screen 31
- FACTORY DEFAULT screen 32
- Control Screen 32
- 2 CANCEL 33
- 3 BATT TEST RESULT 33
- Log Screen 34
- CLEAR LOG Screen 34
- ABOUT Screen 34
- Operation and Display Panel 35
- 29 Liebert 35
- 3.4.4 Prompt List 36
- 3.4.5 Warning List 36
- 3.4.6 Fault List 37
- 4.0 OPERATION 38
- Operation 39
- 33 Liebert 39
- 5.0 COMMUNICATION 40
- 5.2.1 Configuration Program 41
- 5.4.1 Any Mode Shutdown 42
- 5.4.2 Battery Mode Shutdown 43
- 5.4.3 On Battery 43
- 5.4.4 Low Battery 43
- 6.0 MAINTENANCE 44
- Battery Connector 45
- Battery Receptacle 45
- 6.2 Battery Charging 46
- 6.3 Precautions 46
- 6.4 Checking UPS Status 46
- 6.5 Checking UPS Functions 46
- 7.0 TROUBLESHOOTING 47
- 7.2 Troubleshooting 48
- 8.0 BATTERY CABINET 49
- 9.0 SPECIFICATIONS 50
- Table 17 Battery run times 53
- 9.2 Technical Support 55
- Technical Support / Service 56
- Locations 56
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