Vertiv EXM 0080kTK16FN01000, User Manual

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6 Chapter 1 Overview
Liebert EXM 80kVA ~ 200kVA UPS User Manual
the system will automatically transfer back to the normal mode without any manual intervention, and the
power to the load will not be interrupted.
Output switch
Inverter Rectifier
UPS output
Battery
Inverter switch
Figure 1-4 Schematic diagram of battery mode
Note: Battery cold start function is available for switching the UPS on from Battery (charged) mode
directly during mains failure. Therefore, the battery power supply can be used independently to improve
the availability of the UPS.
Automatic restart mode
The UPS has automatic restart function. When the inverter shuts down because the mains fails and the
battery discharges to EOD voltage, if the mains is recovered, the UPS will restart automatically after a
certain time of delay. This function and the automatic restart type 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 of 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 mode
As shown in Figure 1-5, 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 power to the load. At this time, if the inverter and bypass are not synchronized, the power
of the load has transitory interruption, with time of less than 20ms.
Bypass input switch
Bypass input
Static switch
Output switch
UPS output
Figure 1-5 Schematic diagram of bypass mode
Maintenance mode
As shown in Figure 1-6, 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.
Maintenance bypass switch
Bypass input
Maintenance bypass
UPS output
Figure 1-6 Schematic diagram of maintenance mode