Graphics; Set Alarms - Emerson Liebert PEX Series User Manual

The EVENT LOG menu saves the last 400 system records. The event types include message, warning and alarm.
When the event type is message, the LCD will display the event name only.
When the event type is warning, the LCD will display the event name and the alarm indicator will turn on in red.
When the event type is alarm, the LCD will display the event name, the alarm indicator will turn on in red, and an
audible alarm will be raised.

5.6.4 GRAPHICS

The GRAPHICS menu provides two kinds of graphs: RETURN TEMP and RETURN HUMIDITY. These graphs reflect
the temperature and humidity changes over a period of time in the past.
In the graphs, the current temperature or humidity is the origin, the time is the horizontal axis, and the temperature or
humidity is the vertical axis, as shown in Figure 5-7.
As the horizontal axis, the time range can be set into eight kinds. Each pixel indicates different time in different time
ranges. See Table 5-5 for the detailed time range.
Time range
8min
32min
1hr
12hr
24hr
The scaling of the vertical axis can also be set. For the RETURN TEMP, the scaling range is ±3 ~ ±20; for the
RETURN HUMIDITY, the scaling range is ±10 ~ ±30. The bigger the scaling range is, the bigger the value each pixel
indicates will be, and the more centered the curves will be.
You can set the parameters without inputting the password. Press the enter button to highlight the parameters, use the
up or down button to select one parameter. Then press the enter button again to enter the parameter, and use the up
or down button to set the value. Press the enter button to save the change at last.

5.6.5 SET ALARMS

The SET ALARMS menu is used to set the upper and lower limits of temperature and humidity alarms. The settings
will not be lost when the power fails. You can select the 'SET ALARMS' submenu to browse and set the parameters
through the USER MENUS. The parameters are described in Table 5-6.
Note
It is recommended not to change the system defaults. If you consider it necessary to change the defaults, consult professionals
first and set the alarm settings under the guidance of them.
RETURN TEMP 01
+03
27
-03
:
:
t 8d 10 40
Figure 5-7 The graph of return temperature and return humidity
Table 5-5 Time range
Time indicated by each pixel
6s
24s
45s
9min
18min
Liebert.PEX2 Series Air Conditioner User Manual
RETURN HUMIDITY 01
° C
:
t 8d
Time range
2d
4d
8d
16d
Chapter 5 iCOM Controller
+20
+55%
-20
:
10 42
Time indicated by each pixel
36min
72min
144min
288min
51