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Table 10K — 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] exceed
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 cool-
ing 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 alarm is not related to pressure
switch problems.
Protective
Limit
No Motor Current CA P Loss of Motor Cur-
rent: Check sensor.
Check wiring: Check torque setting on
solid state starter. Check for main circuit
breaker trip. Check power supply to PSIO
module.
Excessive numbers of the same fault can lead to severe machine damage.
Seek service expertise.
WARNING
!
WARNING