Maintenance Bypass - Liebert Vertiv GXT5 Installer/User Manual

Table 1-4 Major Components (For 16 kVA to 20 kVA)
ITEM COMPONENT
Transient Voltage Surge
1
Suppression (TVSS) and
EMI/RFI Filters
2 Battery Charger
3 Batteries
4 DC-to-DC Converter
Rectifier/Power Factor
5
Correction (PFC) Circuit
6 Inverter
7 Internal Bypass
Outlet group
8
Optional POD output
9

1.7.1. Maintenance Bypass

On 5-kVA to 10-kVA models, the UPS includes manual maintenance bypass in a removable section of the
rear of the UPS. Maintenance bypass keeps connected equipment powered with utility power and allows
replacement of the UPS in the event of a UPS malfunction.
• The bypass power path does not protect the connected equipment from disturbances in the utility
power supply.
18
OPERATION/FUNCTION
Provide surge protection. Filter electromagnetic interference (EMI) and radio
frequency interference (RFI). Minimize surges or interference present in the
utility power and protect devices connected on the same branch as the UPS.
Regulates input AC power to continuously float-charge the batteries.
Batteries are charges when the UPS is plugged in, even when not powered-on.
Valve-regulated, non-spillable, lead-acid batteries.
NOTE: To maintain battery design life, operate the UPS in an ambient
temperature of 59 °F to 77 °F (15 °C to 25 °C).
Raises the DC voltage from the battery to the optimum operating voltage for
the inverter. This allows the inverter to operate continuously at its optimum
efficiency and voltage, thus increasing reliability.
In normal operation, converts utility AC 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 sine-wave input current ensures
efficient use of utility power and reduces reflected harmonic distortion making
cleaner power available to devices that are not protected by the UPS.
In normal operation, inverts the DC output of the PFC circuit into precise,
regulated sine-wave AC power. When utility power fails, the inverter receives
DC power from the DC-to-DC converter. In either operating mode, the UPS
inverter remains on-line, generating clean, precise, regulated AC-output power.
In the unlikely event of UPS failure such as overload or over-temperature,
automatically transfers the connected load to bypass.
To manually transfer the connected load from inverter to bypass, see
Transferring from Normal to Bypass Mode
Output receptacles
Output receptacles
on page 50
GXT5 Description