32 Chapter 4 UPS Operation Instructions
Liebert ITA 16kVA/20kVA User Manual
Chapter 4 UPS Operation Instructions
This chapter gives a detailed description of UPS operation procedures.
Refer to
Chapter 3 Operation And Display Panel
for all buttons operation and LED display in operation. During the
operation, the buzzer alarm may appear, at this point, you should press the ALARM CLEAR button for audible alarm
silence.
Warning: Hazard mains and/or battery voltage exists behind the protective cover
No user accessable parts are located behind the protective covers that require a tool for removal. Only the qualified service
personnel are authorized to remove such covers.
4.1 UPS Start-up
The start-up procedures can be performed after the installation is finished, the system has been commissioned by
authorized personnel and the external input switches are closed.
Warning
This procedure results in mains voltage being applied to the UPS output terminals. Confirm that the load power supply is safe, if
there is a load to be connected with the UPS output terminal. Ensure that the load is isolated with the UPS output terminal, if the
load is not ready for receiving the power supply.
4.1.1 Normal Module Start-up Procedure
This procedure is suitable for UPS start-up when the UPS is in complete disconnection state. Procedures are as
follows:
1. Close the output/input switch outside the UPS on by one.
At this point, LCD displays the start screen, and the rectifier starts. After the rectifier runs in normal state about 30s,
the rectifier start is finished.
2. Press the ON button for 2 seconds.
At this point, the inverter starts, and the inverter indicators are flashing green. After the inverter runs in normal state,
the UPS transfers from bypass state to inverter state. The inverter indicators turn green, and the UPS runs in Normal
state.
4.1.2 Battery Module Start-up Procedure
1. Check that the batteries have been well connected.
2. Press the battery cold start button on the UPS front panel (see Figure1-1).
At this point, LCD displays the start screen. After the rectifier start-up is finished, the fault indicator is off.
3. Press the ON button for 2 seconds, the UPS will run in Battery mode.
4.2 Transferring Procedures Between Operation Modes
4.2.1 Transferring From Normal Mode To Battery Mode
In the event of mains failure, the UPS will switch to Battery mode. If you wish to switch the UPS from Battery mode to
Normal mode, you should wait a few seconds for the mains input recovery. 10 seconds later, the rectifier will restart
automatically, and the inverter will restore the power supply.
