Liebert 3000 2.6Date and Time, 2.7Status Display, 2.8Control Circuit Board, 2.5.4Change Passwords

Operation with Advanced Microprocessor Controls

2.5.4Change Passwords

The display prompts you to enter a three digit password when making changes. The system includes two (2) passwords, one for setpoints and one for setup. The system allows the passwords to be changed by first entering the present password, factory set as “123” for setpoints and “321” for setup. The pass- word function provides system security, so only personnel authorized to make changes should know the passwords. If unauthorized changes are being made, the passwords may be compromised and new ones should be selected. The password function can be disabled by setting DIP switch 8 to OFF.

2.6Date and Time

The current date and time is available through the display. This feature allows the date and time to be read or changed and is accessed by selecting “DATE AND TIME” from the Main Menu.

The “DATE AND TIME” is used only by the control for recording the Alarm History.

NOTE

The clock uses the 24 hour system (For example: 17:00 would be 5:00 PM). The date and time are backed up by battery.

2.7Status Display

The Status Display selected from the Main Menu is the same Status Display that is normally on the screen. While the Main Menu is displayed, you can press the MENU/ESC key to return to the Status Display.

NOTE

The system automatically returns to the Status Display in five minutes if no control keys are pressed.

2.8Control Circuit Board

The control circuit board is located inside the unit behind the LCD display and control key panel. Open the front panel for access to the board.

The control board includes an adjustment for LCD display contrast, nonvolatile memory, DIP switches (which should not require customer changes), control output LEDs and jumpers for board configuration. The jumpers should be placed as follows:

P5—removed

P12—removed

P19—installed on Pins 1 and 2 P47—installed on Pins 1 and 2 P48—installed on Pins 1 and 2

P50—all jumpers installed for 4-20 mA analog inputs. See 4.5.1 - Connecting the Analog Sen- sors for other configurations

P51—removed

2.8.1LCD Display Contrast

The level of contrast due to viewing angle of the LCD display can be adjusted using a small thumb wheel at the upper left of the control board just under the cable going to the display. The control is labeled R6.

NOTE

The LED backlighting on the text (4 x 20) display is always lit.

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