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Compressor VFD Fault
Displayed Text:
C1 Comp Vfd Fault
Trigger:
Trip flag from VFD is set and alarm flags
for the following VFD alarms are NOT set:
• Earth fault
• High control card temperature
• Control word timeout
• High Motor Temp
• DC link undervoltage
• DC link overvoltage
• Mains Phase Loss
• Motor Phase Loss
• Safe Stop
The above conditions are required for one
second to trigger the alarm.
Action Taken:
Rapid shutdown of unit and lock out from
running
Reset:
This alarm can be cleared manually via the
Unit Controller HMI or via BAS command.
When alarm is cleared, command to reset
alarms should be sent to VFD.
Compressor VFD Over Voltage
Displayed Text:
C1 VfdOverVoltage
Trigger:
DC link over voltage alarm flag is set in
compressor VFD for at least one second.
Action Taken:
Rapid shutdown of unit and lock out from
running
Reset:
This alarm will automatically reset when
'DC link over voltage' alarm flag is not set
for at least five seconds.
Compressor VFD Under Voltage
Displayed Text:
C1 VfdUnderVoltage
Trigger:
DC link under voltage alarm flag is set in
compressor VFD.
Action Taken:
Rapid shutdown of unit and lock out from
running
Reset:
This alarm will automatically reset when
'DC link under voltage' alarm flag is not set
for at least five seconds.
Compressor Motor Phase Loss
Displayed Text:
C1 Motor Phase Loss
Trigger:
Any of the following Compressor VFD
alarm flags is set:
• Motor phase U is missing
• Motor phase V is missing
• Motor phase W is missing
Action Taken:
Rapid shutdown of unit and lock out from
running
Reset:
This alarm will automatically reset when
none of the motor phase loss alarm flags
are set for at least five seconds.
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Mains Phase Loss
Displayed Text:
C1 CmpVfd Phase Loss
Trigger:
Compressor VFD sets the 'Mains Phase
Loss' alarm flag for at least one second or
the 'Mains Failure' warning flag for at least
2.5 seconds.
Action Taken:
Rapid shutdown of unit and lock out from
running
Reset:
This alarm can be cleared manually via the
Unit Controller HMI or BAS command if
none of the trigger condition are true.
Motor Earth Leakage
Displayed Text:
C1 Motor Earth Lkg
Trigger:
Compressor VFD sets the 'Earth Fault'
alarm flag .
Action Taken:
Rapid shutdown of unit and lock out from
running
Reset:
This alarm will automatically reset when
the Earth Fault flag is not set for at least
five seconds..
Compressor VFD Control Card Temp
High
Displayed Text:
C1 VfdCtrlCardTmpHi
Trigger:
Compressor is running and VFD sets the
Ctrl Card Temp alarm flag.
Action Taken:
Rapid shutdown of unit and lock out from
running
Reset:
This alarm can be cleared manually via the
Unit Controller HMI or BAS command if
'Ctrl Card Temp' alarm flag is not set for at
least one minute.
Compressor Multiple Start Failure
Displayed Text:
Cn CompMultiStartFail
Trigger:
This alarm is actually triggered on the third
occurrence of the below conditions within 2
hours. Prior occurrences are events.
All of the following must be true to trigger:
Action Taken:
Rapid shutdown of unit and lock out from
running
Reset:
This alarm can be cleared manually via the
Unit Controller HMI or BAS command
41
IOM 1264-1 • NAVIGATOR
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larms and
• 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 < 14hz for more than 30
seconds
MODEL WWV CHILLERS
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venTs
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