M aintenance m ode
As shown in Figure 2.6 below, if the UPS maintenance or service is required, you may use the manual maintenance bypass
switch to transfer the load to maintenance bypass, with no interruption in power to the load. This maintenance bypass switch
is fitted in all UPS modules and rated for full load of a single module.
Figure 2.6 Schem atic d iagram of m aintenance m ode
N O. Description
1 Bypass input
2 Maintenance bypass switch
3 Maintenance bypass
4 UPS output
ECO m ode
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 put the load on the bypass, to achieve the aim of energy-saving. 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 are beyond the predefined and adjustable limits, the system will
transfer to the inverter output, and the transfer time for switching from bypass to inverter is less than 2ms (uninterrupted) and
less than 5ms (interrupted). In this mode, the system can normally charge the battery.
Figure 2.7 Schem atic diagram of ECO m o d e
2 Overview
17
Vertiv™ Liebert® EXM2 UPS User Manual
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