Carrier 19EF Series, Start Up & Operation Manual

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Table 9 — LID Primary and Secondary Messages and Custom Alarm/Alert Messages
with Troubleshooting Guides (cont)
K. MACHINE PROTECT LIMIT FAULTS
Excessive numbers of the same fault can lead to severe
machine damage. Contact your service contractor.
PRIMARY MESSAGE SECONDARY MESSAGE ALARM MESSAGE/PRIMARY CAUSE ADDITIONAL CAUSE/REMEDY
PROTECTIVE LIMIT HIGH DISCHARGE TEMP CMPD [VALUE] exceeded limit of [LIMIT]*.
Check discharge temperature. Check discharge temperature immediately. Check sen-
sor for accuracy; check for proper condenser flow and
temperature; 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] exceeed 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 TEMPERATURE MTRW [VALUE] exceeded limit of [LIMIT]*.
Check motor cooling and solenoid. Check motor temperature immediately. Check sen-
sor for accuracy. Check for proper condenser flow and
temperature. Check motor cooling system for restric-
tions. Check refrigerant filter.
PROTECTIVE LIMIT HIGH BEARING TEMPERATURE 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 solenoid cock
valve. Check sensor accuracy. Check journal and thrust
bearings. Check refrigerant filter. Check for exces-
sive 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 over-
load cutout. 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 Current: Check
sensor.
Check wiring: Check torque setting on solid’state starter.
Check for main circuit breaker trip. Check power sup-
ply to PSIO module.
PROTECTIVE LIMIT POWER LOSS V P Power Loss: Check voltage
supply.
Check 21-vac power to PSIO.
PROTECTIVE LIMIT LOW LINE VOLTAGE V P [VALUE] exceeded limit of [LIMIT]*.
Check voltage supply.
Check 24-vac input sensor on the SMM; adjust po-
tentiometer if necessary. Check transformers to SMM.
Check power to PSIO module. Check distribution bus.
Consult power company. Check trip indication on under/
over voltage device.
PROTECTIVE LIMIT HIGH LINE VOLTAGE V P [VALUE] exceeded limit of [LIMIT]*.
Check voltage supply.
PROTECTIVE LIMIT LOW CHILLED WATER FLOW EVFL Flow Fault: Check evap pump/flow
switch.
Perform pumps Control Test and verify proper
switch operation. Check all water valves and pump
operation.
PROTECTIVE LIMIT LOW CONDENSER WATER FLOW CDFL Flow Fault: Check cond pump/flow
switch.
PROTECTIVE LIMIT HIGH CONDENSER PRESSURE High Cond Pressure [OPEN]: Check switch,
2C aux., and water temp/flow. Check the high-pressure switch. Check for proper con-
denser pressures and condenser waterflow. Check for
fouled tubes. Check the 2C aux. contact and the oil
pressure switch in the power panel. This alarm is not
caused by the transducer.
PROTECTIVE LIMIT HIGH CONDENSER PRESSURE High Cond Pressure [VALUE]: Check switch,
water flow, and transducer. Check water flow in condenser. Check for fouled tubes.
Transducer should be checked for accuracy. This alarm
is not caused by the high pressure switch.
PROTECTIVE LIMIT 1CR AUX CONTACT FAULT CR AUX Starter Contact Fault: Check
1CR/1M aux contacts.
1CR auxiliary contact opened while machine was run-
ning. Check starter for proper operation.
PROTECTIVE LIMIT RUN AUX CONTACT FAULT RUN AUX Starter Contact Fault: Check
1CR/1M aux contacts.
Run auxiliary contact opened while machine was run-
ning. Check starter for proper operation.
PROTECTIVE LIMIT CCN OVERRIDE STOP CHIL S S CCN Override Stop while in
LOCAL run mode.
CCN has signaled machine to stop. Reset and restart
when ready. If the signal was sent by the LID, release
the Stop signal on STATUS01 table.
PROTECTIVE LIMIT SPARE SAFTY DEVICE SRP PL Spare Safety Fault: Check
contacts.
Spare safety input has tripped or factory-installed jumper
not present.
PROTECTIVE LIMIT EXCESSIVE MOTOR AMPS CA P [VALUE] exceeded limit of [LIMIT]*.
High Amps; Check guide vane drive.
Check motor current for proper calibration. Check guide
vane drive and actuator for proper operation.
PROTECTIVE LIMIT EXCESSIVE COMPR SURGE Compressor Surge: Check condenser wa-
ter temp and flow. Check condenser flow and temperatures. Check con-
figuration of surge protection. Check for low refriger-
ant temperature.
PROTECTIVE LIMIT STARTER FAULT STR FLT Starter Fault: Check starter for
fault source.
Check starter for possible ground fault, reverse rota-
tion, voltage trip, etc.
PROTECTIVE LIMIT STARTER OVERLOAD TRIP STR FLT Starter Overload Trip: Check
amps calibration/reset overload.
Reset overloads and reset alarm. Check motor cur-
rent calibration or overload calibration (do not field-
calibrate overloads).
PROTECTIVE LIMIT TRANSDUCER VOLTAGE FAULT V REF [VALUE] exceeded limit of [LIMIT]*.
Check transducer power supply.
Check transformer power (5 vdc) supply to
transducers. Power must be 4.5 to 5.5 vdc.
PROTECTIVE LIMIT LOW OIL PRESSURE Low Oil Pressure [OPEN]: Check oil pres-
sure switch/pump and 2C aux. Check the oil pressure switch for proper operation.
Check oil pump for proper pressure. Check for ex-
cessive refrigerant in oil system.
*[LIMIT] is shown on the LID as the temperature, pressure, voltage, etc., set point predefined or selected by the operator as an override, alert, or alarm
condition. [VALUE] is the actual temperature, pressure, voltage, etc., at which the control tripped.
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