Liebert 3000 ユーザーズマニュアル

The DIP switch settings can be reviewed from the display panel. Changing the DIP switches requires 

opening the front panel for access to the DIP switches on the microprocessor control board.

These selections should match options installed on your unit and should not need to change during 

normal operation. Switches 1 through 7 are self explanatory. DIP switch 8, not shown in Table 11, 

below, enables the password feature when set to ON and disables the password feature if set to OFF.

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 by the control for recording the Alarm History and plotting graphs. 

Selecting PLOT GRAPHS will step to the following menu:

• TEMPERATURE PLOT
• HUMIDITY  PLOT
• ANALOG SENSOR #1 PLOT
• ANALOG SENSOR #2 PLOT
• ANALOG SENSOR #3 PLOT
• ANALOG SENSOR #4 PLOT
• MODIFY PLOT SCALES

Six different data types are recorded for graphing: temperature, humidity, and four user defined ana-

log inputs. Each data type can be viewed over three different time scales and two different resolu-

tions. The three time scales are 90 minutes, 8 hours, and 24 hours. The two resolutions are minimum 

and maximum. With minimum resolution selected, the full scale of the sensor is displayed. In other 

words, the largest and smallest possible sensor readings are shown. Maximum resolution shows a 

range that covers two-fifths of the full scale sensor range. 

The MODIFY PLOT SCALES menu item adjusts the layout of the graph. This setup screen selects 

the time scale and resolution. It also adjusts the center of the graph for a maximum resolution graph.
The time scale and resolution can also be changed while the graph is displayed. The DOWN arrow key 

changes the time scale from 90 minutes, to 8 hours, to 24 hours. The UP arrow key toggles the display 

between maximum and minimum resolution.

1

No Part Coil

Part Coil/Chilled Water

2

Electric/Hot Gas Reheat

Hot Water Reheat

3

All

Not Used

4

No GLYCOOL

GLYCOOL

5

No Dual Cooling

Dual Cooling

6

Not Used

Not Used

7

a

Tight Control

Standard Control

a

SCR reheats only (with special software); otherwise, not used.