Low Discharge Superheat; High Motor Current; High Compressor Vfd Current; Compressor Vfd Temperature High - Daikin Pathfinder AWV Series Installation, Operation And Maintenance Manual

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:
Compressor RLA set point for each
circuit is part of the unit configuration.
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.
IOM 1242-2 • PATHFINDER
• Unit mode is Ice
• Compressor is running
• VFD Input Current >
Compressor RLA set point x
105%
MODEL AWV CHILLERS
®

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 configuration 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 flag from VFD is set and fault
code is not 0053H, 0020H, 003BH,
or 003CH. Other alarms trigger in
response to specific 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.
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