Liebert Extreme Density Chiller XDC - Manual (Page 50)

Microprocessor Control
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5.3.13 ALARM TIME DELAY
Some alarms can be programmed with a time delay as a means of preventing nuisance alarms. This
function specifies the amount of time an alarm must be present before the Liebert XDC recognizes
and annunciates the alarm. If the alarm condition goes away before the time delay has expired, the
alarm will not be recognized, and the time delay timer will be reset. This can be used as a filter to pre-
vent nuisance alarms from transient events.
Time delays for these alarms may be changed:
CUSTOMER—customer alarm
HI RMT TEMP—high remote temperature alarm
LO RMT TEMP—low remote temperature alarm
HI LCL TEMP—high local temperature alarm
LO LCL TEMP—low local temperature alarm
LO REFRIG T—low refrigerant temperature alarm
To view the time delay for an alarm:
1. Press the MENU key.
2. Use the up and down arrow keys to move to the ALARM TIME DELAY menu. Press the ENTER
key to enter into the menu. Use the up and down arrow keys to move through the menu and view
the alarm time delays.
To change the time delay for an alarm:
1. Press the ENTER key. (The control will ask for a service password if passwords are enabled. Use
the up and down arrow keys and ENTER key to enter the three-digit password when prompted.)
2. Press the ENTER key again on the alarm to select the alarm to be changed.
3. Use the up and down arrow keys to change the alarm time delay.
4. Press the ENTER key to record the change.
5. Press the ESC key two to three times to return to the main display.
5.3.14 COM ALARM ENABLE
Each individual alarm can be selected to energize or not to energize the common alarm relay. If the
energize common alarm function is set to YES, the relay is energized immediately as the alarm is
annunciated and de-energized when the alarm condition goes away (only after the alarm has been
recognized). If the alarm is completely DISABLED, the alarm has no effect on the common alarm
relay.
Use the up or down arrow key to scroll to a particular alarm, press the ENTER button to select it,
then press the ENTER button to change the state (Yes or No).
5.3.15 CUSTOM ALARMS
This is the menu where the user selects the alarm message that will be displayed when there is an
input to the customer alarm input on the control board. This menu has four choices: one user-defined
custom message (see CUSTOM TEXT below for details) and three preprogrammed messages:
• SMOKE DETECTED
• CUSTOM 1 (default custom message. If the user enters a custom text message, that custom text
will replace CUSTOM 1.)
• STANDBY UNIT ON
1. Press the ENTER button to access the menu
2. Use the up or down arrow key to view the messages.
3. Press the ENTER button to select the message to be displayed.