Table 10K — Machine Protect Limit Faults

WARNING ! WARNING

Excessive numbers of the same fault can lead to severe machine damage.

Seek service expertise.

Primary

Secondary

Alarm Message/

Additional Cause/Remedy

Message

Message

Primary Cause

 

 

 

 

 

 

 

 

High Discharge

CMPD [VALUE]

Check discharge temperature immedi-

 

Temp

exceeded limit of

ately. Check sensor for accuracy; check

Protective

 

[LIMIT]*. Check dis-

for proper condenser flow and tempera-

 

charge temperature.

ture; check oil reservoir temperature.

Limit

 

 

 

 

 

Check condenser for fouled tubes or air in

 

 

 

 

 

 

 

 

 

 

machine. Check for proper guide vane

 

 

 

 

 

actuator operation.

 

 

 

 

 

 

Protective

Low Refrigerant

ERT [VALUE] exceed

Check for proper amount of refrigerant

Temp

limit of [LIMIT]*. Check

charge; check for proper water flow and

Limit

 

evap pump and flow

temperatures. Check for proper guide

 

 

switch.

vane actuator operation.

 

 

 

 

 

 

 

High Motor Temper-

MTRW [VALUE]

Check motor temperature immediately.

Protective

ature

exceeded limit of

Check sensor for accuracy. Check for

 

[LIMIT]*. Check motor

proper condenser flow and temperature.

Limit

 

cooling and solenoid.

Check motor cooling system for restric-

 

 

 

 

 

tions. Check motor cooling solenoid for

 

 

 

 

 

proper operation. Check refrigerant filter.

 

 

 

 

 

 

 

High Bearing Tem-

MTRB [VALUE]

Check for throttled oil supply isolation

Protective

perature

exceeded limit of

valves. Valves should be wide open.

 

[LIMIT]*. Check oil cool-

Check oil cooler thermal expansion valve.

Limit

 

ing control.

Check sensor accuracy. Check journal

 

 

 

 

 

and thrust bearings. Check refrigerant fil-

 

 

 

 

 

ter. Check for excessive oil sump level.

 

 

 

 

 

 

 

Low Oil Pressure

OILPD [VALUE]

Check power to oil pump and oil level.

 

 

exceeded limit of

Check for dirty filters or oil foaming at

Protective

 

[LIMIT]*. Check oil pump

start-up. Check for thermal overload cut-

 

and transducer.

out. Reduce ramp load rate if foaming

Limit

 

 

 

 

 

noted.

 

 

 

 

 

 

 

 

 

 

Note: This alarm is not related to pressure

 

 

 

 

 

switch problems.

 

 

 

 

 

 

Protective

No Motor Current

CA P Loss of Motor Cur-

Check wiring: Check torque setting on

 

 

 

 

 

 

rent: Check sensor.

solid state starter. Check for main circuit

Limit

 

 

 

 

breaker trip. Check power supply to PSIO

 

 

 

 

 

module.

 

 

 

 

 

 

Page 294
Image 294
Carrier PC211 specifications Machine Protect Limit Faults, Protective