Product Description
Liebert
®
GXT4
™
12
1.7.2 Manual Bypass Mode
Manual Bypass Mode occurs when the unit is manually placed in internal bypass by navigating the
LCD menu to select 3 Control > 1 Turn On & Off > Turn UPS Bypass. Bypass operation is indicated
by an audible alarm and illuminated amber bypass indicator. (If other indicators are illuminated,
refer to 7.0 - Troubleshooting). During Bypass Mode, mains power bypasses the inverter and
provides energy to the connected load.
NOTICE
Risk of loss of power to the connected load. Can cause equipment damage.
Turning Off the UPS in Bypass Mode will result in loss of output power to the connected load.
1.7.3 Battery Mode
The Liebert GXT4 enters Battery Mode when mains power fails or is outside acceptable limits. The
battery system supplies power through the DC-to-DC converter to the inverter to generate clean AC
power for the connected loads.
When the Liebert GXT4 enters Battery Mode, the UPS sounds a half-second beep at 10-second
intervals. When approximately 2 minutes of run time remains, the beeps sound every 5 seconds to
warn that the battery is getting low (this Low Battery Warning is user-configurable).
In Battery Mode, the battery indicator will illuminate and the LCD will show the prompt utility power
not available.
Press either the Up or Down button once, then press the Enter button to clear the prompt and silence
the audible alarm. Once the alarm prompt has been acknowledged, the screen showing the estimated
battery run time and battery capacity will be visible. Refer to 7.0 - Troubleshooting.
For approximate battery run times, refer to Table 21.
NOTICE
Risk of loss of power to the connected load. Can cause equipment damage.
Turning Off the Liebert GXT4 when it is in Battery Mode will result in loss of output power to
the connected load.
If the UPS is turned Off manually, it must be manually restarted after mains power returns.
If the UPS is turned Off by a communication signal or because the batteries are depleted, it
will operate as set in the configuration program for Auto-Restart (Refer to 5.2.1 -
Configuration Program).
1.7.4 Battery Recharge Mode
Once mains power is applied to the Liebert GXT4, the Battery Charger begins charging the batteries.
1.7.5 Frequency Converter Mode
All models of the Liebert GXT4 are capable of frequency conversion. Frequency Conversion Mode can
be selected using the configuration program. Allowable frequency operating modes include:
• Auto Sensing - 50Hz or 60Hz – Bypass Enabled
• Auto Sensing - 50Hz or 60Hz – Bypass Disabled
• Frequency Converter - 50Hz – Bypass Disabled
• Frequency Converter - 60Hz – Bypass Disabled
NOTE
The default for all models of the Liebert GXT4 is “Auto Sensing - 50Hz or 60Hz – Bypass
Enabled.”
CAUTION
Risk of electric shock. Can cause injury or death.
Never touch the AC input receptacle while the UPS is operating. Voltage may still be present
even when the AC input indicator is Off.
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