Daikin AWV024 - Low Discharge Superheat; High Motor Current; High Compressor VFD Current; Compressor VFD Temperature High

IOM 1242-2 • PATHFINDER
®
MODEL AWV CHILLERS 74 www.DaikinApplied.com
alarms and evenTs
Low Discharge Superheat
Alarm: Low Discharge Superheat
Displayed Text: Cn Disc SH Low
Trigger: If all of the following are true for
at least 30 minutes, the alarm is
triggered:
• Circuit state is Start or Run
• Liquid injection is off
• DSH < Low DSH Limit set point
Action Taken: Normal shutdown of circuit
Reset: This alarm can be cleared manually
via the Unit Controller keypad or via
BAS command.
High Motor Current
Alarm: High Motor Current
Displayed Text: Cn MotorCurrentHigh
Trigger 1: VFD Output Current > Max Motor
Current x 1.05 for at least 30 seconds
Trigger 2: [VFD Output Current > Max Motor
Current x 0.97 AND Compressor
Speed < 20 Hz] for at least 180
seconds .
See the section covering circuit level
calculations for the details on the Max
Motor Current value.
Action Taken: Rapid shutdown of circuit and lock out
from running
Reset: This alarm can be cleared manually
via the Unit Controller keypad or via
BAS command.
High Compressor VFD Current
Alarm: High Compressor VFD Current
Displayed Text: Cn VFD Current High
Trigger: Alarm will trigger when all of the
following are true for at least 5
seconds:
• Unit mode is Ice
• Compressor is running
• VFD Input Current >
Compressor RLA set point x
105%
Compressor RLA set point for each
circuit is part of the unit conguration.
Action Taken: Rapid shutdown of circuit and lock out
from running
Reset: This alarm can be cleared manually
via the Unit Controller keypad or via
BAS command.
Compressor VFD Temperature High
Alarm: Compressor VFD Temperature High
Displayed Text: Cn CompVfdTempHigh
Trigger: VFD Heatsink temperature > Max VFD
Temperature for 5 seconds
Action Taken: Rapid shutdown of circuit and lock out
from running
Reset: This alarm can be cleared manually
via the Unit Controller keypad or via
BAS command if temperature ≤ Max
VFD Temperature.
Compressor VFD Comm Failure
Alarm: Compressor VDF Comm Failure
Displayed Text: Cn CompVfdCommFail
Trigger: Unit has compressor VFD’s and there
is either a modbus conguration error
or there are 10 consecutive modbus
commands that failed to recieve a
valid response.
Action Taken: Normal shutdown of circuit and lock
out from running
Reset: This alarm can be cleared manually
via the Unit Controller keypad or via
BAS command if communication has
been restored.
Compressor VFD Fault
Alarm: Compressor VFD Fault
Displayed Text: Cn Comp Vfd Fault
Trigger: Fault ag from VFD is set and fault
code is not 0053H, 0020H, 003BH,
or 003CH. Other alarms trigger in
response to specic fault codes so if
the fault is due to those codes, this
alarm should not trigger.
Action Taken: Rapid shutdown of circuit and lock out
from running
Reset: This alarm can be cleared manually
via the Unit Controller keypad or
via BAS command. When alarm
is cleared, command to reset fault
should be sent to VFD.