ALARMS
MT2300 WSHP BACNET INTEGRATION
DAIKIN APPLIED
20
Alarms
The MicroTech unit controller has various ways of monitoring,
acknowledging, and clearing alarms .
lists all alarms
available to the network from the MicroTech controller .
Alarm Monitoring
When a shutdown alarm is present, the BACnet object for unit
status (McQWSHPStatus, MSV:4) indicates
1=Off Alarm.
CurrentAlarm (MSV:2) provides the highest priority active
alarm to the network .
PreviousAlarm (MSV:5) provides the previous highest priority
active alarm to the network .
Clearing Alarms
The alarm condition must be corrected and the alarm cleared
before normal unit operation can resume . Some alarms clear
automatically when conditions return to normal, while others
must be cleared manually . These conditions are noted in
Alarms can cleared by writing the BV:1 BACnet alarm object
from 0 = Normal to 1 = Clear Alarm . When the network
indicates an alarm, it is best to investigate what has triggered
the alarm and determine root cause . The purpose of writing to
BV:1 is to intentionally clear any active alarms .
The Clear Alarm parameter reverts to Normal after being
written to from the network . If an alarm is cleared but the alarm
condition still exists, the controller immediately re-activates the
alarm .
NOTE:
Cycling power to the unit controller resets the fault
alarm .
Intelligent Alarm Reset
The MicroTech unit controller supports intelligent alarm
resetting. This feature automatically clears the alarm the first
two times it occurs within a 24-hour period . The third time an
alarm occurs, it must be manually cleared .
This feature is used to minimize nuisance trips of automatic
lockouts caused by temporary conditions that may
interrupt unit operation . Intelligent alarms are described as
“lntel” in the Clear column of
Remote Sensor with Tenant Override
This method of clearning alarms applies to units configured
for room sensor control using a remote sensor tenant override
feature . The room sensor tenant override can be used to
generate a manual alarm clear .
Once the cause of the alarm has been addressed, press the
tenant override button for more than 10 seconds . This forces
the unit controller to clear the alarm .
NOTE:
Grounding the tenant override generates a BACnet
“I Am” Service Request .
Manual Alarm Reset Methods
These conditions generate a manual reset:
1 . A brief disruption to unit power causes the controller to
reboot
2 . The room sensor timed override button is pressed for
more than 10 seconds
3 . A remote network alarm reset is performed