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High Motor Current Hold
Trigger:
This event will trigger when all of the following
are true:
• Unit mode = Cool
• compressor is running
• Motor Current > Max Motor Current x
0.95
Action Taken: Circuit will not be able to increase in capacity.
Reset:
This event is reset when Motor Current < Max
Motor Current x 0.95 for at least 60 seconds.
It is also reset when the compressor is no
longer running or the unit operating mode is
changed to Ice.
High Motor Current Unload
Trigger:
This event will trigger when compressor is
running, Unit mode = Cool, and either of the
following occur:
• Motor Current > Max Motor Current
• Motor Current > Max Motor Current x
0.97 for 5 seconds
Action Taken: Compressor speed will decrease 1Hz every
two seconds until the event reset condition is
met.
Reset:
This event is reset when Motor Current < Max
Motor Current x 0.97 for at least 3 seconds.
It is also reset when the compressor is no
longer running or the unit operating mode is
changed to Ice.
High VFD Line Current Hold
Trigger:
This event will trigger when all of the following
are true for at least 5 seconds:
• Unit mode = Cool
• compressor is running
• VFD Line Current > VFD Primary RLA
set point
VFD Primary RLA set point is part of the unit
configuration.
Action Taken: Circuit will not be able to increase in capacity.
Reset:
This event is reset when VFD Line Current
< VFD Primary RLA set point x 0.99 for at
least 3 minutes. It is also reset when the
compressor is no longer running or the unit
operating mode is changed to Ice.
IOM 1264-1 • NAVIGATOR
®
MODEL WWV CHILLERS
High VFD Line Current Unload
Trigger:
This event will trigger when all of the following
are true for at least 5 seconds:
• Unit mode = Cool
• compressor is running
• VFD Line Current > VFD Primary RLA
set point x 1.05
VFD Primary RLA set point is part of the unit
configuration.
Action Taken: Compressor speed will decrease until the
event reset condition is met. The speed
decrements and intervals for these speed
decreases will be the same as those used
during normal capacity control.
Reset:
This event is reset when VFD Line Current
≤ VFD Primary RLA set point x 1.05. It is
also reset when the compressor is no longer
running or the unit operating mode is changed
to Ice.
Low Pressure Ratio Shutdown
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.
Circuit state is Run and pressure ratio < 1.3
for a time > Low Pressure Ratio Delay set
point.
Action Taken: Rapid shutdown of unit
Reset:
This event resets immediately after triggering.
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
< 14Hz for more than 30 seconds
Action Taken:
Rapid shutdown of unit
Reset:
This event resets immediately after
triggering.
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