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.
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 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.
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 motor cooling solenoid for proper opera-
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-
nal and thrust bearings. Check refrigerant filter. 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 over-
load cutout. Reduce ramp load 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.
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 24-vac input on the SMM (terminals 23 and
24). Check transformers to SMM. Check power to PSIO
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
CDFL Flow Fault: Check condenser pump/
flow switch.
PROTECTIVE LIMIT
HIGH CONDENSER PRESSURE
High Cond Pressure [OPEN]*: Check switch,
oil pressure contact, and water temp/flow.
Check the high-pressure switch. Check for proper con-
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.
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
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 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
when ready. If the signal was sent by the LID, release
the Stop signal on STATUS01 table.
PROTECTIVE LIMIT
SPARE SAFETY 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.
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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