What to do if the FAULT LED lights up and there is a warning tone on my Emerson Liebert GXT-MT?
If the FAULT LED is lit and you hear a warning tone once a second on your Emerson UPS, this indicates an overload. To resolve this, remove some of the loads connected to the UPS output.
Why is the emergency supply period shorter than nominal value on my Emerson Liebert GXT-MT UPS?
If the emergency supply period of your Emerson UPS is shorter than expected, it could be due to batteries not being fully charged or defective batteries. Charge the batteries for at least 1-2 hours and then check their capacity. If the issue continues, it is recommended to consult your dealer.
How to troubleshoot no power indication on Emerson Liebert GXT-MT?
If your Emerson UPS shows no indication and emits no warning tone even when connected to the mains power supply, the cause may be no input voltage. Check the building wiring socket outlet and the input cable.
What to do if FAULT LED lights up with a permanent warning tone on Emerson UPS?
If the FAULT LED is illuminated and a permanent warning tone is sounding on your Emerson UPS, this indicates a UPS fault. In this case, notify your dealer.
Why is the INVERTER LED on and an alarm sounding on my Emerson UPS?
When the INVERTER LED lights up and an audible alarm sounds every 4 seconds on your Emerson UPS, it signifies that the mains power supply has failed, and the system is automatically switching to battery mode. If the audible alarm sounds every second, the battery is almost empty.
Why is the LINE LED blinking on my Emerson Liebert GXT-MT UPS?
If the LINE LED is blinking on your Emerson UPS, it means the phase and neutral conductors at the input of the UPS system are reversed. Rotate the mains power socket by 180° or correctly connect the UPS system.
What does it mean when the FAULT LED is on and the BATTERY LED blinks on my Emerson Liebert GXT-MT?
If the FAULT LED is lit, the BATTERY LED is blinking, and a warning tone sounds once a second on your Emerson UPS, it suggests that the charger or batteries are damaged. Notify your dealer.
Why are the LINE and BYPASS LEDs on when power is available on my Emerson Liebert GXT-MT UPS?
If the LINE and BYPASS LEDs are lit on your Emerson UPS even when the power supply is available, it indicates that the inverter is not switched on. Press the On-Switch “I”.
What does it mean when LINE-LED blinks and BATTERY-LED lights up on Emerson Liebert GXT-MT UPS?
If the LINE LED blinks and the BATTERY LED lights up on your Emerson UPS, it indicates that the input power and/or frequency are out of tolerance. Check the input power source, and if necessary, inform your dealer.
Detailed steps for UPS installation and wiring by professionals.
Description of UPS operation during a power outage.
Guidelines for maintaining UPS batteries, including charging.
Important safety notes for battery handling and replacement.
Detailed steps for UPS installation and wiring by professionals.
Description of UPS operation during a power outage.
Guidelines for maintaining UPS batteries, including charging.
Important safety notes for battery handling and replacement.
The Liebert GXT-MT On-Line Series is an uninterruptible power supply (UPS) designed to provide continuous and reliable power protection for business-critical applications, specifically for Novell, Windows NT, and UNIX servers. It employs double-conversion technology, which means it continuously processes incoming AC power, converting it to DC to charge batteries and power an inverter, which then generates a clean, sinusoidal AC output for connected loads. This design ensures that computers and peripherals are always supplied with power from the inverter, whether from the mains or, in the event of a power failure, from the maintenance-free batteries.
The core function of the Liebert GXT-MT is to protect connected equipment from various power disturbances by providing a stable and continuous power supply. It operates on a double-conversion principle, where all incoming mains power is rectified to DC, which then feeds an inverter to produce a clean AC output. This isolates the load from fluctuations in the utility power.
In Utility Power Mode, the UPS draws power from the mains. The utility power LED and the inverter LED are illuminated, and the load level LEDs indicate the current load capacity. If the utility power's voltage or frequency falls outside the normal range, the UPS automatically switches to battery mode. If an overload occurs, the load level LEDs will illuminate, and an alarm will sound, prompting the user to reduce the connected load to below 90% of the UPS's nominal power capacity. When connecting a generator, it's crucial to activate the generator and wait for stable operation before supplying power to the UPS, ensuring the generator's capacity matches the UPS's performance characteristics.
In Battery Mode, the UPS operates on its internal batteries when mains power fails. The battery LED and inverter LED are lit, and the battery level LEDs indicate the remaining battery capacity. The UPS emits a beep every 4 seconds in this mode. This audible alarm can be silenced by pressing the "ON" button for more than 1 second, though the alarm will reactivate when the battery level becomes critically low to prompt a graceful shutdown of connected loads. As battery capacity decreases, the number of illuminated battery level LEDs reduces. If the battery voltage drops to an alarm level, the buzzer will beep once every second, signaling insufficient battery capacity and an impending automatic shutdown. Users are advised to promptly save data and eliminate non-essential loads.
In Bypass Mode, the UPS supplies power directly from the utility mains through an internal filter, bypassing the inverter. The utility power LED and the bypass LED are lit, and the load LEDs indicate the connected load capacity. The UPS will beep once every 2 minutes in bypass mode. If the utility power LED flashes, it indicates that the utility power's voltage or frequency has exceeded the normal range. It's important to note that in bypass mode, the UPS does not provide backup functionality.
In Abnormality Mode, if the fault LED is illuminated, it indicates that the UPS is operating in an abnormal condition, requiring attention.
The UPS also features a Test Function, which can be initiated by pressing the On-Switch "I" or by disconnecting the input of the UPS from the power supply.
For Long Backup Time Models, external battery packs can be connected. These models require specific battery voltages (36Vdc for GXT1000L-MT, 96Vdc for GXT2000L-MT/GXT3000L-MT) and a precise connection procedure to ensure proper operation and safety.
The Liebert GXT-MT is designed for ease of use with a clear display panel and straightforward controls.
Display Panel: The display panel provides visual feedback on the UPS's operational status through various LEDs:
Communication Port: The UPS includes an RS232 interface for communication, with specific pin assignments for TXD, RXD, and GND. An optional AS400 card is available for AS400 communication protocol, providing outputs for UPS Fail, Summary Alarm, Battery Low, UPS ON, Bypass, and Line Loss, and inputs for GND and Remote Shutdown.
Software: The Liebert GXT-MT comes with WinPower, a UPS monitoring software. This user-friendly interface allows users to monitor and control the UPS, providing safe auto-shutdown for multi-computer systems during power failures. It also enables monitoring and control of multiple UPS units on the same LAN. Installation involves inserting the CD, connecting the software cable, and following on-screen instructions. Once installed, a green plug icon appears in the system tray.
The Liebert GXT-MT series UPS requires minimal maintenance, primarily focused on battery care to maximize its lifespan and ensure reliable operation.
General| Topology | Double Conversion Online |
|---|---|
| Form Factor | Tower |
| Frequency | 50/60 Hz |
| Output Power Factor | 0.9 |
| Operating Temperature | 0°C to 40°C |
| Humidity | 0-95% non-condensing |
| Power Capacity | 1 kVA / 0.9 kW, 2 kVA / 1.8 kW, 3 kVA / 2.7 kW |
| Battery Type | Sealed Lead-Acid (SLA) |
| Communication Ports | USB, RS-232 |
| Dimensions | Varies by model |
| Weight | Varies by model |
| Efficiency | Up to 95% |
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