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XT-70 Control Panel 24
HMI TEMPERATURE DEVIATION ALARM:
The TEMPERATURE DEVIATION ALARM screen allows the user to set parameters for two alarms. The two
alarms are the low deviation and high deviation alarms. These alarms are based off of setpoint, and use the ple-
num average temperature. If the plenum temperature drops below the low deviation setting for a programmed
amount of time, the system will shut down on a low deviation alarm. The timer for the low deviation alarm is the
LDT timer. The current value of the LDT is shown below the low deviation setting. This timer is in minutes and
will count down when the alarm is active.
If the plenum temperature rises above the high deviation setting for a programmed amount of time, the system
will shut down on a high deviation alarm. The timer for the high deviation alarm is the HDT. It is in minutes and
will count down when the alarm is active.
The high and low deviation alarms are active only when the system is in an active run mode. The LDT and HDT
can be set via the web interface or the HMI service screen with a valid password. To change the values, press
the spinner buttons. When done, press the SAVE button.
The two alarms can be set to soft, hard or off. If either alarm is set to off, the alarm is inactive. A soft alarm will
alarm and show up as a secondary mode, but will not interrupt the normal operation. A hard alarm will show up
as a secondary mode and will shut the panel down in Alarm Standby mode. Setting either timer to 0 will turn
the alarm off. Setting the associated timer to a negative time will set it for a soft alarm and setting the
associated timer to a positive time will set it for a hard alarm. All timers are set in the E2 parameter screen,
accessed by using the middle left outside button on the HMI.
Auto Reset, by checking this box the high dev alarm will be reset in the Cooling if it trips in either Refrigeration or
Timed Run. If it trips during the Cooling mode, it will remain locked out.
5.7
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