Autom atic restart m ode
The UPS has automatic restart function. When the inverter shuts down because of the mains failure and battery discharges to
EOD voltage, if the mains is recovered, the UPS will restart automatically after a certain time of delay. This function restart
delay time can be set by the service engineer authorized by Vertiv.
During the process of automatic restart time of delay, the UPS will charge the battery to protect against the power-off risk to
the load device caused by mains power failure.
If the automatic restart function has not been set, the user can manually start the UPS through Reset Fault function.
Bypass m ode
As shown in Figure 2.5 below, in normal mode, in case of an inverter failure, an inverter overload or an inverter manual
shutdown, the static switch will transfer the load from the inverter side to bypass side, with no interruption in supplying the
power to the load. At this time, if the inverter and bypass are not synchronized, power supply to the load has transitory
interruption, with time of less than 20ms.
Figure 2.5 Schem atic diagram of bypass m ode
N O. Description
1 Bypass input
2 Static switch
3 UPS output
4 Bypass input switch
5 Output switch
2 Overview
16
Vertiv™ Liebert® EXM2 UPS User Manual
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