Maintenance Bypass; Operating Modes; Mains Mode; Manual Bypass Mode - Vertiv Liebert GXT4-6000RTL630 Installer/User Manual

2.7.8 Maintenance Bypass

The GXT4 provides a manual maintenance bypass in a removable section of the rear of the UPS. This
allows replacement of the UPS in the event of a UPS malfunction while keeping the connected equipment
powered with utility power.
NOTE: The bypass power path does not protect the connected equipment from disturbances in the
mains supply.

2.8 Operating Modes

The UPS operation modes include the following: Mains (AC) Mode, Bypass Mode, Battery Mode, Battery
Recharge Mode, Active ECO Mode and Frequency Converter Mode.
Refer to Operation and Display Panel
control buttons.

2.8.1 Mains Mode

During Mains Mode, the mains provides input power to the GXT4. The filters, PFC circuit and inverter
process this power to provide high-quality sine wave power to connected loads. The UPS maintains the
batteries in a fully-charged state.

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 Con trol > 1 T u rn O n & O ff > T u rn UPS Byp ass. Bypass operation is indicated by an audible
alarm and illuminated amber bypass indicator. (If other indicators are illuminated, refer to
Troubleshooting
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 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 u tility p ower n ot
availab le.
Vertiv | Liebert GXT4 Installer/User Guide |
on page 33 for details about the operating mode indicators and
on page 59). During Bypass Mode, mains power bypasses the inverter and provides
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