Carrier 69NT20-531-300 manual Controller Alarm Indications Sheet 2

Page 43

 

Table 3-6 Controller Alarm Indications (Sheet 2 of 4)

 

 

 

 

 

Alarm 25 is triggered by the opening of the condenser motor internal protector

 

 

and will disable all control units except for the evaporator fans. This alarm will

AL25

Condenser Fan Mo-

remain active until the motor protector resets. This alarm triggers failure action

 

tor Safety

C (evaporator fan only) or D (all machinery off) of Function Code Cd29 if the

 

 

unit has a perishable set point. Failure action D (all machinery off) is triggered if

 

 

the unit has a frozen set point

 

All Supply and Re-

Alarm 26 is triggered if the Controller determines that all of the control sensors

AL26

turn temperature

are out-of-range. This can occur for box temperatures outside the range of -50_C

 

Control Sensors

to +70_C (-58_F to +158_F). This alarm triggers the failure action code set by

 

Failure

Function Code Cd29.

 

 

The Controller has a built-in Analog to Digital (A-D) converter, used to convert

 

 

analog readings (i.e. temperature sensors, current sensors, etc.) to digital read-

AL27

A/D Accuracy Fail-

ings. The Controller continuously performs calibration tests on the A-D con-

 

ure

verter. If the A-D converter fails to calibrate for 30 consecutive seconds, this

 

 

alarm is activated.This alarm will be inactivated as soon as the A-D converter

 

 

calibrates.

 

 

Alarm 28 is triggered if suction pressure is below 2 psia and alarm 66 (Suction

 

 

Pressure Transducer Failure) is not active. This alarm will be inactivated when

AL28

Low Suction Pres-

suction pressure rises above 2 psia for three continuous minutes. This alarm trig-

 

sure

gers failure action C (evaporator fan only) or D (all machinery off) as determined

 

 

by User Selectable Failure Response if the unit has a perishable set point; Failure

 

 

action D (all machinery off) if the unit has a frozen set point. Reset SMV.

 

 

During start-up diagnostics, the EEPROM is examined to determine validity of

 

 

its contents. This is done by testing the set point and the alarm list. If the con-

 

 

tents are invalid, Alarm 51 is activated. During control processing, any operation

AL51

Alarm List Failure

involving alarm list activity that results in an error will cause Alarm 51 to be ac-

tivated. Alarm 51 is a “display only” alarm and is not written into the alarm list.

 

 

 

 

Pressing the ENTER key when “CLEAr” is displayed will result in an attempt to

 

 

clear the alarm list. If that action is successful (all alarms are inactive), Alarm 51

 

 

will be reset.

 

 

Alarm 52 is activated whenever the alarm list is determined to be full; at start-up

AL52

Alarm List Full

or after recording an alarm in the list. Alarm 52 is displayed, but is not recorded

in the alarm list. This alarm can be reset by clearing the alarm list. This can be

 

 

 

 

done only if all alarms written in the list are inactive.

 

 

 

 

 

Alarm 53 is caused by the battery pack charge being too low to provide sufficient

AL53

Battery Pack Failure

power for battery-backed recording. Renew replaceable batteries. If this alarm

 

 

occurs on start up, allow a unit fitted with rechargeable batteries to operate for up

 

 

to 24 hours to charge rechargeable batteries sufficiently to deactivate the alarm

 

 

Alarm 54 is activated by an invalid primary supply temperature sensor reading

 

 

that is sensed outside the range of -50 to +70_C (-58_F to +158_F) or if the

 

 

probe check logic has determined there is a fault with this sensor. If Alarm 54 is

 

Primary Supply

activated and the primary supply is the control sensor, the secondary supply sen-

 

sor will be used for control if the unit is so equipped. If the unit does not have a

AL54

Temperature Sensor

secondary supply temperature sensor, and AL54 is activated, the primary return

 

Failure (STS)

 

sensor reading, minus 2_C will be used for control.

 

 

 

 

NOTE

 

 

The P5 Pre-Trip test must be run to inactivate the alarm

 

 

 

 

DataCORDER

This alarm activates to indicate the DataCORDER has a software failure. To

AL55

clear this alarm, reconfigure the unit to the current model number. This failure

 

Failure

may be the result of a voltage dip in access of 25%.

 

 

 

 

 

T-309

3-18

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Contents Service Model Safety Summary 309 Safety-2 Safety-3 309 Table of Contents Table of Contents Check Controller Function Codes Connect Remote MonitoringPrecheck Procedure Checking The Stepper valve Valve ReplacementEvaporator Coil Replacement Evaporator Heater Replacement Replacing The Evaporator Fan AssemblyElectrical Wiring Schematic Refrigeration Circuit Schematic Economized Operation Refrigeration Circuit Schematic Standard OperationList of Tables DataCORDER Configuration VariablesUnit is fitted with a scroll compressor Section IntroductionManual, T-300 Section Description Evaporator Section Compressor Section Condenser Section Communications interface module For further information Module which allow communication with a masterOil level range, with the compressor off Model RSH105 Weight Dry 46.5 kg 103 lbTemperature Approved Oil Mobil ST32 Oil Charge 2957 ml 100 ouncesElectrical Data Safety and Protective Devices Refrigeration Circuit 2.5.1 Standard Operation Standard Operation with Receiver Refrigeration Circuit Schematic -- Economized Operation Section Microprocessor Temperature Control SystemKEY Function Controller Software Modes of Operation Perishable Mode -- Economy Controller Alarms Unit PRE-TRIP Diagnostics DCF02=6 Thermistor inputssupply & returnDCF02=2 DCF02=5 Usda thermistor inputsRaw Data Report for ABC1234567 Standard Configuration Download ReportLogging Interval dCF03 DataCORDER may be powered up in any one of four waysDataView DataCORDER Alarms SnAP CnF11 Defrost Off Selection NoOFFStd, Full CnF33 Snap Freeze OptionDisplay Only Functions Plicable with frozen set points Defrost temperature sensor reading is displayedPossibly delaying a needed defrost cycle Sensor ReadingController Function Codes Sheet 3 Controller Alarm Indications Sheet 1 Controller Alarm Indications Sheet 2 Controller Alarm Indications Sheet 3 Memory failure Error DescriptionOnds Draw test is done after 15 secondsP1-1 Draw test is done after 10 secondsCrease, the test fails Supply is comparedTest fails P6-2Requirements Control temperature must be at least 15.6C 60F Pressure switch is open or the condenser fan switch is openTimer is started Denser fan is started and a 60 second timer is startedSet point, the test proceeds to test Requirements Control temperature must be at least 7.2C 45FBy starting P10-0 over Inapplicable Functions Display Title Data 10 DataCORDER Alarm Indications 69NT Fresh AIR Makeup OperationTo start a pre-trip test, do the following Will be displayedWill be displayed Pull Down Falling Rising Controller Operation -- Perishable ModeController Operation -- Frozen Mode Frozen Mode Defrost Section Troubleshooting Unit will not heat or has insuffi Bent motor shaft Will not initiate defrostSuperheat Unit reads abnormal currents Current sensor wiring Check Valve Frontseated Backseated Section ServiceCompressor in a deep vacuum, internal dam- age will result Refrigerant Leak Checking Remove all refrigerant using a refrigerant recovery system Refrigerant Charge Compressor Upper Mounting Compressor OIL Level Condenser FAN and Motor Assembly Wrapped with Insulating compound. See Two expansion valves are used, the evaporatorRemoving the Expansion Valve Check superheat refer to step Cleaned regularly. The preferred cleaning fluid is freshIf applicable, braze the equalizer connection to Equalizer line14. Unloader Solenoid Valve Start unit and check operationEvaporator FAN Motor Capacitors Valve Override Controls Precheck Procedure TP1 Mounting Stud Type Cut one replacement sensor wire opposite color Cut wires 5 cm 2 inches from shoulder of defecCut one wire of existing cable 40 mm 1-1/2 inch Shorter than the other wireMaintenance of Painted Surfaces 23 Door Hinge Repair Crack, Chip & Hole Repair Kit 24. Insert Location In-lbs Ft-lbs 13.99 18.86 In-lbs #10 Ft-lbs 12.72 17.1414.6 49.4 37.08 12.3 41.6 31.25 32.8 24.64 22.7 17.00 11.9 Section Electrical Wiring Schematic Schematic Diagram Wiring Diagram Sheet 1 Wiring Diagram Sheet 2 Index 309 Index-2

69NT20-531-300 specifications

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