Carrier 17EX specifications Chiller Protect Limit Faults

Table 12 Ð 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 immediately. Check sen-
		Check discharge temperature.							sor for accuracy; check for proper condenser ¯ow 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 for proper amount of refrigerant charge; check
		Check evap pump and ¯ow switch.							for proper water ¯ow and temperatures. Check for
									proper guide vane actuator operation.
PROTECTIVE LIMIT	HIGH MOTOR TEMPERATURE	MTRW [VALUE] exceeded limit of [LIMIT]*.							Check motor temperature immediately. Check sen-
		Check motor cooling and solenoid.							sor for accuracy. Check for proper condenser ¯ow and
									temperature. Check motor cooling system for restric-
									tions. Check motor cooling solenoid for proper opera-
									tion. Check refrigerant ®lter.
PROTECTIVE LIMIT	HIGH BEARING TEMPERATURE	MTRB [VALUE] exceeded limit of [LIMIT]*.							Check for throttled oil supply isolation valves. Valves
		Check oil cooling control.							should be wide open. Check oil cooler thermal ex-
									pansion valve. Check sensor accuracy. Check jour-
									nal and thrust bearings. Check refrigerant ®lter. Check
									for excessive oil sump level.
PROTECTIVE LIMIT	LOW OIL PRESSURE	OILPD [VALUE] exceeded limit of [LIMIT]*.							Check power to oil pump and oil level. Check for dirty
		Check oil pump and transducer.							®lters 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							Check the oil pressure switch for proper operation.
		pressure switch/pump and 2C aux.							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					Check wiring: Check torque setting on solid-state starter.
		sensor.							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
PROTECTIVE LIMIT	LOW LINE VOLTAGE	V	P [VALUE] exceeded limit of [LIMIT]*.						24). Check transformers to SMM. Check power to PSIO
		Check voltage supply.							module. Check distribution bus. Consult power
									company.
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/¯ow							Perform pumps control test (from CONTROL TEST
		switch.
									table) and verify proper switch operation. Check all
PROTECTIVE LIMIT	LOW CONDENSER WATER FLOW	CDFL Flow Fault: Check condenser pump/
									water valves and pump operation.
		¯ow switch.
PROTECTIVE LIMIT	HIGH CONDENSER PRESSURE	High Cond Pressure [OPEN]*: Check switch,							Check the high-pressure switch. Check for proper con-
		oil pressure contact, and water temp/¯ow.							denser pressures and condenser water ¯ow. 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,							Check water ¯ow in condenser. Check for fouled tubes.
		water ¯ow, and transducer.							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,							Check water ¯ow in condenser. Check for fouled tubes.
		water ¯ow, and transducer.							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 auxiliary contact opened while chiller was run-
		1CR/1M aux contacts.							ning. Check starter for proper operation.
PROTECTIVE LIMIT	RUN AUX CONTACT FAULT	RUN					AUX Starter Contact Fault: Check		Run auxiliary contact opened while chiller was run-
		1CR/1M aux contacts.							ning. Check starter for proper operation.
PROTECTIVE LIMIT	CCN OVERRIDE STOP	CHIL					S	S CCN Override Stop while in	CCN has signaled chiller to stop. Reset and restart
		LOCAL run mode.							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			Spare safety input has tripped or factory-installed jumper
		contacts.							not present.
PROTECTIVE LIMIT	EXCESSIVE MOTOR AMPS	CA		P [VALUE] exceeded limit of [LIMIT]*.					Check motor current for proper calibration. Check guide
		High Amps; Check guide vane drive.							vane drive and actuator for proper operation.
PROTECTIVE LIMIT	EXCESSIVE COMPR SURGE	Compressor Surge: Check condenser wa-							Check condenser ¯ow and temperatures. Check con-
		ter temp and ¯ow.							®guration of surge protection.
PROTECTIVE LIMIT	STARTER FAULT	STR				FLT Starter Fault: Check starter for			Check starter for possible ground fault, reverse rota-
		fault source.							tion, voltage trip, etc.
PROTECTIVE LIMIT	STARTER OVERLOAD TRIP	STR				FLT Starter Overload Trip: Check			Reset overloads and reset alarm. Check motor cur-
		amps calibration/reset overload.							rent calibration or overload calibration (do not ®eld-
									calibrate overloads).

*[LIMIT] is shown on the LID as the temperature, pressure, voltage, etc., set point prede®ned 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.

90