Daikin MICROTECH III Operating Manual page 44

10.6.2 External Event
This alarm indicates that a device, whose operation is linked with this machine, is reporting a problem on the dedicated
input.
Symptom
Unit status is Run.
Bell icon is moving on controller's
display.
String in the alarm list:
UnitExternalEvent
String in the alarm log:
UnitExternalEvent
String in the alarm snapshot
UnitExternalEvent
Reset
Local HMI
Network
Auto
NOTE: What above applies in case of configuration of the external fault digital input as Event
10.6.3 Evaporator Entering Water Temperature Sensor Fault
This alarm is generated any time the input resistance is out of an acceptable range.
Symptom
Unit status is Off.
All circuits are stopped with a normal
shutdown procedure.
Bell icon is moving on controller's
display.
String in the alarm list:
UnitOffEvpEntWTempSen
String in the alarm log:
UnitOffEvpEntWTempSen
String in the alarm snapshot
UnitOffEvpEntWTempSen
Reset
Local HMI
Network
10.6.4 Condenser Entering Water Temperature Sensor Fault
This alarm is generated any time the input resistance is out of an acceptable range.
Symptom
Unit status is Off.
All circuits are stopped with a normal
shutdown procedure.
Bell icon is moving on controller's
display. String in the alarm list:
UnitOffCndEntWTempSen
String in the alarm log:
UnitOffCndEntWTempSen
String in the alarm snapshot
UnitOffcndEntWTempSen
Reset
Local HMI
Network
Auto
D–EOMWC00A07-16_02EN
Cause
There is an external event that has
caused the opening, for at least 5
seconds, of the digital input on the
controller board.



Cause
Sensor is broken.
Sensor is shorted.
Sensor is not properly connected
(open).


Cause
Sensor is broken.
Sensor is shorted.
Sensor is not properly connected
(open).



Operation Manual
Solution
Check for reasons of external event
and if it can be a potential problem
for a correct chiller operation.
Notes
The alarm is automatically cleared
when the problem is solved.
Solution
Check for sensor integrity. according
table and allowed kOhm (k ) range.
Check correct sensors operation.
Check if sensor is shorted with a
resistance measurement.
Check for absence of water or
humidity on electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according electrical scheme.
Notes
Solution
Check for sensor integrity. according
table and allowed kOhm (k ) range.
Check correct sensors operation.
Check if sensor is shorted with a
resistance measurement.
Check for absence of water or
humidity on electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according electrical scheme.
Notes
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