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Table 12 — LID Primary and Secondary Messages and Custom Alarm/Alert Messages
with Troubleshooting Guides (cont)
L. CHILLER PROTECT LIMIT FAULTS
Excessive numbers of the same fault can lead to severe chiller
damage. Seek service expertise.
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.
Checkdischargetemperatureimmediately.Checksen-
sorforaccuracy; checkforpropercondenserflow and
temperature; check oil reservoir temperature. Check
condenser for fouled tubes or air in chiller. Check for
proper guide vane actuator operation.
PROTECTIVE LIMIT LOW REFRIGERANT TEMP ERT [VALUE] exceeded limit of [LIMIT]*.
Check evap pump and flow switch.
Checkfor properamount ofrefrigerantcharge; 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-
sorforaccuracy.Checkforpropercondenser flowand
temperature. Check motorcooling system for restric-
tions.Check motorcoolingsolenoidfor properopera-
tion. 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 thermal ex-
pansion valve. Check sensor accuracy. Check jour-
nalandthrust bearings.Checkrefrigerantfilter.Check
for excessive oil sump level.
PROTECTIVE LIMIT LOW OIL PRESSURE OILPD [VALUE] exceeded limit of [LIMIT]*.
Check oil pump and transducer.
Check powerto oilpump andoil level.Check fordirty
filtersoroilfoamingatstart-up.Checkfor thermalover-
load cutout. Reduce rampload rate if foaming noted.
NOTE: This alarm is not related to pressure switch
problems.
Low Oil Pressure [OPEN]*. Check oil
pressure 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.
PROTECTIVE LIMIT NO MOTOR CURRENT CA P Loss of Motor Current: Check
sensor.
Checkwiring:Checktorquesettingonsolid-statestarter.
Checkfor maincircuit breakertrip.Check powersup-
ply to PSIO module.
PROTECTIVE LIMIT POWER LOSS V P Power Loss: Check voltage
supply.
Check 24-vac input on the SMM (terminals 23 and
24).ChecktransformerstoSMM.CheckpowertoPSIO
module. Check distribution bus. Consult power
company.
PROTECTIVE LIMIT LOW LINE VOLTAGE V P [VALUE] exceeded limit of [LIMIT]*.
Check voltage supply.
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 (from CONTROL TEST
table) and verify proper switch operation. Check all
water valves and pump operation.
PROTECTIVE LIMIT LOW CONDENSER WATER FLOW CDFLFlow Fault: Check condenser pump/
flow switch.
PROTECTIVE LIMIT HIGH CONDENSER PRESSURE High CondPressure[OPEN]*:Checkswitch,
oil pressure contact, and water temp/flow.
Checkthehigh-pressureswitch.Checkfor propercon-
denser pressures and condenser water flow. 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.
HighCondPressure[VALUE]*:Checkswitch,
water flow, and transducer.
Checkwaterflowincondenser.Checkforfouledtubes.
Transducershouldbecheckedforaccuracy.Thisalarm
is not caused by the high pressure switch.
PROTECTIVE LIMIT HIGH CONDENSER PRESSURE HighCondPressure[VALUE]*:Checkswitch,
water flow, and transducer.
Checkwaterflowincondenser.Checkforfouledtubes.
Transducershouldbecheckedforaccuracy.Thisalarm
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 chiller 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 chiller 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 chiller to stop. Reset and restart
whenready.If thesignalwas sentby theLID,release
the Stop signal on STATUS01 table.
PROTECTIVE LIMIT SPARE SAFETY DEVICE SRP PL Spare Safety Fault: Check
contacts.
Sparesafetyinputhastrippedorfactory-installedjumper
not present.
PROTECTIVE LIMIT EXCESSIVE MOTOR AMPS CA P [VALUE] exceededlimit of[LIMIT]*.
High Amps; Check guide vane drive.
Checkmotorcurrentforpropercalibration.Checkguide
vane drive and actuator for proper operation.
PROTECTIVE LIMIT EXCESSIVE COMPR SURGE Compressor Surge: Check condenser wa-
ter temp and flow.
Checkcondenser flowandtemperatures.Checkcon-
figuration of surge protection.
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).
*[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. [OPEN] indicates that an input circuit is open.
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