Vertiv | Liebert EXS 80kVA UPS | User Manual
10
Overview
• In the event of a mains failure or if the mains voltage is outside tolerance while the UPS is in Bypass
mode, the UPS will shut down and the power supply to the load will be interrupted.
Maintenance Bypass Mode
If the UPS maintenance or service is required, you may use the manual maintenance bypass switch to transfer
the load to maintenance bypass, without any power interruption to the load. This maintenance bypass switch is
fitted in all UPS modules and rated for full load of a single module.
Figure 1-6 Schematic Diagram of Maintenance Mode
•
In the event of UPS malfunctions or abnormal operation, contact your nearest Vertiv branch office or
local service center.
• NEVER attempt to repair the UPS yourself, as this may result in injury to personnel and/or damage to
equipment.
ECO Mode
If ECO mode is selected, all power switches and the battery switches are closed except for the maintenance
bypass switch, and the system prefers to place the load on the bypass, to save energy. When the bypass supply
is within the range of normal frequency and normal voltage (adjustable), the load is powered by the bypass, with
the inverter on stand-by; when the voltage and/or frequency of the bypass supply exceeds the pre-defined and
adjustable limits, the system is transfered to the inverter output, and the transfer time for switching from bypass
to inverter is less than 5 mins. In this mode, the system can normally charge the battery.
ECO mode is an energy-saving operating mode. ECO mode can be used to reduce power losses by using the
UPS to supply equipment that is not sensitive to main power quality.
Maintenance bypass switch
Bypass input
Maintenance bypass
UPS output
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