Liebert CHALLENGER 3000 - Manual (Page 13)

Operation with Advanced Microprocessor Controls
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2.2 Status Display
The display normally shown includes the present room temperature, humidity, active status func-
tions (cooling, heating, dehumidifying, humidifying), and active alarms. If no keys are pressed within
5 minutes, the system automatically returns to the Status Display. The Status Display may also be
selected from the Main Menu.
2.3 Main Menu
Press the MENU/ESC key to display the Main Menu. The Menu selections include:
• Status/alarm data
• Setpoints/setup
• Date and time
• Status display
2.4 Status/Alarm Data
Selecting STATUS/ALARM DATA from the Main Menu will display the following selections:
• Active alarms
• Operating status
• Alarm history log
• Run hours log
• Analog sensors
2.4.1 Active Alarms
This screen displays any active alarm. The alarms are numbered, #1 being the most recent. If there
are no active alarms, then “NO ALARMS PRESENT” will be displayed.
2.4.2 Operating Status
The Operating Status is intended to provide the user with displayed information concerning what the
control is calling for the system to do.
For example: The display indicates the chilled water valve is 68% open. On a new call for cooling, it
takes several seconds for the valve to travel from fully closed to 68% open. So, when the display reads
68%, it may take a few seconds for the valve to actually open 68%. Also, if the display indicates a com-
pressor is operating but the compressor has not yet turned on, it may be off because of the short cycle
control (see 4.4.1 - Short Cycle Control).
2.4.3 Alarm History Log
A history of the 10 most recent alarms is kept in nonvolatile memory complete with the date and time
that the alarms occurred. The first alarm in the history is the most recent and the 10th is the oldest.
If the alarm history is full (10 alarms) and a new alarm occurs, the oldest is lost and the newest is
saved in alarm history location 1. The rest are moved down the list by 1. Alarm history on new units
may show the results of factory testing.
NOTE
There may be some time lapse before a specific component matches the displayed number.