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Compressor VFD Comm Failure
Alarm:
Compressor VFD 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 receive 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.
CC Module Comm Failure
Alarm:
CC Module Comm Failure
Displayed Text:
CCn Module Comm Fail
Trigger:
Communication with the module has failed.
Specifically, this means the reliability value
reported for the module is anything other
than 0 for at least 3 seconds.
Action Taken:
Rapid shutdown of circuit and lock out from
running
Reset:
This alarm can be cleared manually via the
keypad or BAS command after reliability
value reported for the module is 0 for at
least 5 seconds.
EEXV Module Comm Failure
Alarm:
EEXV Module Comm Failure
Displayed Text: EEXVn Mod Comm Fail
Trigger:
Evaporator Expansion Valve Type is set as
an ETS model number (see
communication with the module has failed.
Specifically, this means the reliability value
reported for the module is anything other
than 0 for at least 3 seconds.
Action Taken:
Rapid shutdown of circuit and lock out from
running
Reset:
This alarm can be cleared manually via the
keypad or BAS command after reliability
value reported for the module is 0 for at
least 5 seconds.
IOM 1242-8 • PATHFINDER
Table 36)
MODEL AWV CHILLERS
®
Compressor VFD Fault
Alarm:
Compressor VFD Fault
Displayed
Cn Comp Vfd Fault
Text:
Trigger:
F3/F4 compressor types: Fault flag from VFD is
set and fault code is not 0020H. Other alarms
trigger in response to specific fault codes so if the
fault is due to those codes, this alarm should not
trigger.
With 3120 and 3122 compressor types: There will
be a 10 second delay after the controller boots
before allowing this alarm to trigger. The alarm
will trigger when register 8196 (Active Alarm
Group word) ≠ 0 for two seconds and neither of
the following alarm trigger conditions are met:
• Register 8196 (Active Alarm Group word) bit 5 is
set and register 524 (Alarm Code 5) = 0
• Register 8196 (Active Alarm Group word) bit 13
is set and register 532 (Alarm Code 13) = 1
The above trigger conditions are for the High
Motor Temperature alarm and the Safe Torque Off
alarm in the VFD, both are handled as discreet
alarms in the controller.
Action
Rapid shutdown of circuit and lock out from
Taken:
running
Reset:
This alarm can be cleared manually via the Unit
Controller keypad or BAS command. When alarm
is cleared, command to reset fault should be sent
to VFD.
Evaporator Pressure Sensor Fault
Alarm:
Evaporator Pressure Sensor Fault
Displayed
Cn EvapPressSenFault
Text:
Trigger:
Trigger any time sensor input voltage is less than
and
400mv and UC communication with CC module is
OK, for at least 1 second.
Trigger when sensor input voltage is more than
4600mv and UC communication with CC module
is OK, for at least 1 second. However, this trigger
should only occur after circuit state is start or run
for at least 90 seconds.
Trigger if the evaporator approach is less than
1.11°C for more than 100 seconds during the first
5 minutes the compressor is running, and more
than 30 seconds thereafter. This trigger should
only be enabled after the circuit state is start or
run for 30 seconds. The purpose of this trigger
condition is to prevent operation if the sensor is
reading high but not out of range.
Action
Rapid shutdown of circuit and lock out from
Taken:
running
Reset:
This alarm can be cleared manually via the
keypad or BAS command if sensor input voltage
is 400 mv to 4600 mv for at least 5 seconds.
80
Alarms and Events
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