User Manual 10H52192UM60 - Rev. 1 - 09/2011 53
Operating Instructions Liebert NX
6.10 UPS Reset Procedure
After the EPO is activated or the UPS is shutdown due to inverter overtemperature, overload, battery overvoltage, or too many
transfer times, once all appropriate measures have been taken to rectify the problem indicated by the alarm message on the LCD,
carry out the following procedures to restore the UPS to normal operation.
1. Press the FAULT CLEAR button to enable the system to exit the shutdown state.
2. When the rectifier begins to operate normally (rectifier indicator green), press and hold the INVERTER ON button for 2 seconds.
Note
1. The rectifier will start and the bypass will begin to supply the load. The rectifier indicator flashes while the rectifier is starting up.
When the rectifier enters normal operation (about 30 seconds later), the rectifier indicator turns green.
2. The rectifier will be turned on automatically when the overtemperature fault disappears 5 minutes after the disappearance of
overtemperature signals.
If the mains input is cut off, the UPS will shut down completely when the EPO switch is pressed. The UPS will start up in bypass when
the mains input is returned. There will be power at the output terminals of the UPS.
Warning
1. If the maintenance switch QS3 is in the ON position and the mains input is present, there will be power at the output terminals of the
UPS.
2. If you need to carry out maintenance work on a faulty module, wait for 10 minutes to let the internal DC bus capacitor fully discharge
before removing the faulty module for maintenance.
6.11 Selecting the Display Language
The LCD menu and data display is available in 12 languages: Chinese, Dutch, English, French, German, Italian, Japanese, Polish,
Portuguese, Russian, Spanish, and Swedish.
Use the following procedure to select the language:
1. On the Output menu screen, press the F3 (left) or F4 (right) key to select the Language menu.
2. Press the F5 (enter) key to move the cursor to the screen data window.
3. Press the F3 (left) or F4 (right) key to select the desired language.
4. Press the F5 (enter) key to confirm.
5. Press the F2 (ESC) key repeatedly to return to the Output menu. At this point, the LCD display is shown in the selected language.
6.12 Changing the Current Date and Time
Use the following procedure to change the system date and time:
1. On the Output menu screen, press the F3 (left) or F4 (right) key to select the Settings menu.
2. Press the F5 (enter) key to move the cursor to the screen data window.
3. Press the F3 (up) or F4 (down) key to select the Date & Time item and then press the F5 (enter) key to confirm.
4. Press the F3 (up) key to change the position indicated by the small cursor. Press the F4 (right) key to change the small cursor
position.
5. Press the F5 (Enter) key to confirm and press the F2 (ESC) key to return to the Output menu.
6.13 Control Password
Password protection is used to limit the control functions that are accessible to the operator. The default password is ‘12345’. This
password provides access to UPS and battery test functions.
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