2.8.2 Manual Bypass Mode
Manual Bypass Mode occurs when the unit is manually placed in internal bypass by navigating the LCD
menu to select 3 C on trol > 1 Tu rn O n & O ff > Tu rn UPS By p ass. Bypass operation is indicated by an audible
alarm and illuminated amber bypass indicator. (If other indicators are illuminated, refer to
Troubleshooting on page 53). 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.
2.8.3 Battery Mode
The 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 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 5seconds 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 u tility p ower n ot
availab le.
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 Troubleshooting on page 53.
For approximate battery run times, refer to .
NOTICE
Risk of loss of power to the connected load. Can cause equipment damage.
Turning Off the 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 Configuration Program
on page 44).
2.8.4 Battery Recharge Mode
Once mains power is applied to the GXT4, the Battery Charger begins charging the batteries.
Vertiv | Liebert GXT4 Installer/User Guide | 18
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