IOM 1242-8 • PATHFINDER
®
MODEL AWV CHILLERS
84 www.DaikinApplied.com
Alarms and Events
High VFD Temperature Hold
Trigger:
This event will trigger when all of the following
are true for at least for 30 seconds.
• Unit mode is Cool
• Compressor is running
• VFD Heatsink Temp > Max VFD
Temperature - 6°C
Action Taken: Compressor will not be able to increase
speed/capacity.
Reset:
This event is reset when VFD Heatsink Temp
< Max VFD Temperature - 6°C for at least 60
seconds. It is also reset when the compressor
is not running or the unit operating mode is
changed to Ice.
High VFD Temperature Unload
Trigger:
This event will trigger when all of the following
are true for at least for 30 seconds.
• Unit mode is Cool
• Compressor is running
• VFD Heatsink Temp > Max VFD
Temperature - 3°C
Action Taken: Compressor speed reduced by 1 Hz every 10
seconds.
Reset:
This event is reset when VFD Heatsink Temp
≤ Max VFD Temperature - 3°C. It is also reset
when the compressor is not running or the unit
operating mode is changed to Ice.
Compressor Start Failure
Trigger:
This event will trigger on the first and second
occurrence of the below conditions within
2 hours. A third occurrence within a 2 hour
window triggers the alarm.
All of the following must be true to trigger:
• Compressor Run command is on
• Compressor VFD Communication
Failure is not active
• Either VFD Actual Speed = 0 for more
than 15 seconds or VFD Actual Speed <
13 Hz for more than 30 seconds.
Action Taken: Rapid shutdown of circuit
Reset:
N/A
High VFD Capacitor Current Hold
Trigger:
This event will trigger when all of the following
are true for at least 3 seconds:
• unit mode is cool
• compressor is running
•
Capacitor Current % of Limit ≥ 95%
Capacitor Current % of Limit is called rIc in
TDE Macno terminology.
Action Taken: Compressor will not be able to increase
speed/capacity
Reset:
This event is reset when VFD Capacitor
Current % of Limit ≤ 92% for at least 10
seconds. It is also reset when the compressor
is not running or the unit operating mode is
changed to Ice.
High VFD Capacitor Current Unload
Trigger:
This event will trigger when all of the following
are true for at least 5 seconds:
• unit mode is cool
• compressor is running
•
Capacitor Current % of Limit ≥ 97%
Capacitor Current % of Limit is called rIc in
TDE Macno terminology.
Action Taken: Compressor speed will decrease at a rate
equivalent to 1hz every two seconds
Reset:
This event is reset when VFD Capacitor
Current % of Limit ≤ 97%. It is also reset when
the compressor is not running or the unit
operating mode is changed to Ice.
