Transferring Between Operation Modes; Emergency Shutdown And Recovery - Liebert UPS System User Manual

5. Shutdown in United powering mode
The procedures of shutdown in United powering mode is the same with those of
shutdown in normal mode.

6.1.3 Transferring between operation modes

The UPS can transfer among various operation modes after it is in normal mode.
The following operations can be done if the input power source of UPS meets the
requirements and the load capacity is lower than that of single module UPS system.
1. From normal mode to battery mode
Switch off Q1, the UPS can transfer from normal mode to battery mode
automatically.
2. From normal mode to bypass mode
Press "inverter shutdown" button to transfer from normal mode to bypass mode
without power interruption.
3.From bypass mode to normal mode
Q1 is closed, press the "inverter start" button on the display panel to transfer from
bypass mode to normal mode. If the bypass source exceeds the normal range,
there will be interruption in the transferring process.
4.From ECO mode to normal mode
Set the UPS in normal mode again and the UPS can transfer from ECO mode to
normal mode.
Note: The engineer should set through software.
5.From battery mode to normal mode
When the rectifier source is normal, switch on Q1, the UPS will transfer from
battery mode to normal mode automatically.

6.1.4 Emergency shutdown and recovery

Under any status, press the "emergency shutdown" button on the panel for 2
seconds if overload or the faults that may endanger the safety occur. The system
will then shut down the rectifier, inverter and stop outputting power(including the
inverter and bypass), at the same time, disconnect the battery contactor.
At this, if the user confirms that the fault is cleared, press the "fault clear" button to
let the system get out of the emergency shutdown state. When the UPS enters the
normal state, the rectifier starts again, the battery contactor closes and the bypass
Chapter 6 Maintenance
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