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Table 8 — LID Primary and Secondary Messages and Custom Alarm/Alert Messages
with Troubleshooting Guides
K. Machine Protect Limit Faults
Primary
Message
Secondary
Message
Alarm Message/
Primary Cause
Additional Cause/Remedy
Protective
Limit
High Discharge
Temp
CMPD [VALUE] exceeded
limit of [LIMIT]*. Check dis-
charge temperature.
Check discharge temperature immedi-
ately. Check sensor for accuracy; check
for proper condenser flow and tempera-
ture; check oil reservoir temperature.
Check condenser for fouled tubes or air in
machine. Check for proper guide vane
actuator operation.
Protective
Limit
Low Refrigerant
Temp
ERT [VALUE] exceeded
limit of [LIMIT]*. Check
evap pump and flow switch.
Check for proper amount of refrigerant
charge; check for proper water flow and
temperatures. Check for proper guide
vane actuator operation.
Protective
Limit
High Motor Temper-
ature
MTRW [VALUE] exceeded
limit of [LIMIT]*. Check
motor cooling and solenoid.
Check motor temperature immediately.
Check sensor for accuracy. Check for
proper condenser flow and temperature.
Check motor cooling system for restric-
tions. Check motor cooling solenoid for
proper operation. Check refrigerant filter.
Protective
Limit
High Bearing Tem-
perature
MTRB [VALUE] exceeded
limit of [LIMIT]*. Check oil
cooling control.
Check for throttled oil supply isolation
valves. Valves should be wide open.
Check oil cooler thermal expansion valve.
Check sensor accuracy. Check journal
and thrust bearings. Check refrigerant fil-
ter. Check for excessive oil sump level.
Protective
Limit
Low Oil Pressure OILPD [VALUE] exceeded
limit of [LIMIT]*. Check oil
pump and transducer.
Check power to oil pump and oil level.
Check for dirty filters or oil foaming at
start-up. Check for thermal overload cut-
out. Reduce ramp load rate if foaming
noted.
Note:
This is not related to pressure
switch problems.
Excessive numbers of the same fault can lead to severe machine damage. Seek service expertise.
WARNING
!
WARNING