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Liebert NXC
6.3 UPS Complete Shutdown
If you need to shut down the UPS completely, transfer the UPS from Inverter mode to Maintenance Bypass mode according to
the procedures in 6.2.4, so as not to effect the load during the UPS power-off. Then if the power to the load is not needed,
open the maintenance bypass MCB directly, as shown in Figure 6-1.
Figure 6-1 Configuration of the UPS with external maintenance bypass
In the case of UPS installation that use the customer's power distribution system, to isolate the UPS from AC power, it is
necessary to open the external input MCB. (If the mains and bypass are independently powered, close the two input MCBs).
Open the maintenance bypass input in order to prevent the physical injury.
6.4 EPO
EPO switch is designed to switch off the UPS in emergency conditions (such as fire, flood). The system will turn off the rectifier,
inverter and stop powering the load immediately (inverter and bypass output included), and the battery stops charging or
discharging.
If the mains input is present, the UPS control circuit will remain active; however, the output is opened. To remove all mains
power from the UPS, the external input switch should be disconnected.
6.5 Auto Restart
When the mains power failure, the UPS draws power from the battery to supply the load until the batteries end of discharge is
reached, then the UPS will shut down.
The UPS will automatically restart and recover output power supply:
After the mains power is restored.
The UPS Auto Restart function is enabled.
After the Auto Restart is delayed (default: 10 minutes). During the Auto Restart delay, the UPS will charge the battery to
provide a safety margin for equipment shutdown if input power fails again.
If the Auto Restart function is disabled, you can restart the UPS manually by pressing the FAULT CLEAR button.
User Manual 10H52188UM60 - Rev. 2 - 09/2012
Caution
UPS Operation Instructions
53
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