Truck/Trailer Refrigeration Unit - Sunbelt Transport Refrigeration

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4.21 MICROPROCESSORNOTEThe erasable, programmable, read only memory(EPROM) chip (component U3 on themicroprocessor logic board) has a window on itwhich is covered with a label listing the revisionlevel of the software. The window is used to erasethe chip’s memory with the use of ultravioletlight. The label prevents light from entering thechip and erasing the memory. Under NOcircumstances should this label be removed.CAUTIONUnder no circumstances should atechnician electrically probe the processorat any point, other than the connectorterminals where the harness attaches.Microprocessor components operate atdifferent voltage levels and at extremely lowcurrent levels. Improper use of voltmeters,jumper wires, continuity testers, etc. couldpermanently damage the processor.As mentioned above, some microprocessor inputsoperate at voltage levels other than the conventional 12vdc. Connector points and the associated approximatevoltage levels are listed below for reference only. Underno circumstances should 12 vdc be applied at theseconnection points.Grounded wrist cuffs are available at most radio,computer and electronic supply stores. It isrecommended that these be worn whenever handling amicroprocessor.Table 4-3. Connection Point VoltageConnection Point Approximate VoltageCDT, RAS, WTS 2.5 vdc (Variable)MPF15.0 vdcCAUTIONMost electronic components aresusceptible to damage caused by electricalstatic discharge (ESD). In certain cases, thehuman body can have enough staticelectricity to cause resultant damage to thecomponents by touch. This is especiallytrue of the integrated circuits found on thetruck/trailer microprocessor.Although there is less danger of electrical staticdischarge ESD damage in the outdoor environmentwhere the processor is likely to be handled, proper boardhandling techniques should always be stressed. Boardsshould always be handled by their edges, in much thesame way one would handle a photograph. This not onlyprecludes the possibility of ESD damage, but also lowersthe possibility of physical damage to the electroniccomponents. Although the microprocessor boards arefairly rugged when assembled, they are more fragile whenseparated and should always be handled carefully.During emergency situations, the test board may beused to keep a unit running and prevent a critical loadfrom spoiling. Since the microprocessor is totallydisconnected from the unit, it cannot monitor theengine’s safety switches for oil pressure and coolanttemperature. Since the engine is running unprotected whenthe test board is used, it is imperative that should aproblem develop with the microprocessor, it be replacedimmediately. The test board is intended to be atrouble-shooting tool only.When using the test board to troubleshoot, the unitshould be started in low speed, unloaded cool in the sameway as when the processor starts the unit. Good judgmentshould also be used when cycling any unit with the testboard. Rapid cycling should be avoided.When welding is required on the unit frame, or on thefront area of the trailer, ALL wiring to themicroprocessor MUST be disconnected. When welding isperformed on other areas of the trailer, the welderground connection MUST be in close proximity to thearea being welded. It is also good practice to remove bothbattery cables before welding on either the unit frame orthe truck to prevent possible damage to othercomponents such as the alternator and voltage regulator.a. Replacing Key Board (Trailer Unit)Should damage to the Key Board of themicroprocessor occur, it is possible to replace only theKey Board.It is absolutely imperative that whenever amicroprocessor is removed from a unit for any reason,that the old Key Board gasket be removed, and a new onebe installed. All replacement microprocessors and KeyBoards are packaged with replacement gaskets for thispurpose.The tightening sequence shown below should beadhered to when tightening the retaining bolts or nuts.The recommended torque for securing nuts or bolts is 15inch-lbs. Over tightening the nuts or bolts, or using atightening sequence other than the one shown, may causewarping of the Key Board.513 482Figure 4-20. Tightening Sequence forMicroprocessor (Trailer Unit)b. Hour MeterThe hour meter can be set to any value via the serialport, if the meter has less then five hours on it. This allowsa replacement microprocessor to be set to the same hoursas the microprocessor it is replacing.The microprocessor has two programmable registerswhich are set via the serial port. These registers arecompared to one of the hour meters (diesel, standby, orswitch on). If the hour meter is greater than the registerthen the proper alarm is set.764-19 62-02884
4.22 CONFIGURATION OF MICROPROCESSORWhen replacing a microprocessor it is important tocheck that the configurations are compatible for the unitinto which it will be installed. (This same board fits bothtrailer and truck model units.) All configuration fieldsshould be viewed before starting the unit.To reach the configuration fields:1. Turn the Run/Stop switch to the Stop position.2a. Trailer units only --- With the unit off, locate theserial port plug located below the control panel. Removethe protective plug to gain access to the wire terminals.Place an insulated jumper wire between wires SPA andSPB at the serial port plug.2b. Truck units only ---Place an insulated jumperwire between plug terminals L (SPA) and M (SPB) in the“CC” plug (see plug drawing below for terminallocations.)CAUTIONDo not allow jumper wire to touch anyground.3. Turn the Run/Stop switch to the Run position.TheFAULTlightwillcomeon,andthemicrodisplaywillread “CNF1 TV” or “CNF1 DI”. Remove the jumperwire from the serial port and reinstall the protective plug.The configuration screen will now remain available for 5minute. Scroll through the configuration list using theFunction Key and compare the settings with those shownon the table in the next column. If any of theconfigurations need to be changed, continue with step (4)below.4. To change the configuration selection:a. Bring the configuration to be changed onto thedisplay. Press the Enter Key to allow change access to thedisplayed configuration.b. Press either the Up or Down Keys to displayavailable selections for that configuration. Leave thecorrect selection on the screen. The selection display willflash, warning the operator that the displayed value hasnot been entered. Press the Enter Key to enter the newselection into memory. (The display will revert to theoriginal selection if no further action is taken for the nextfive seconds.)c. Continue to scroll through the configuration listby pressing the Function Key. Change any otherconfigurations as required.d. When finished turn the Run/Stop switch to theStop position, then back to the Run position to start theunit.ConfigurationCNF1OFFONCNF2OFFONCNF3OFFONCNF4OFFONDescriptionDI EngineTV EngineCDT not usedCDT used86_ Setpoint90_ SetpointCNF5 --- Not UsedCNF6CNF7CNF8CNF9OFFONOFFONOFFONOFFONHeat lockout on +10_FHeat lockout off (Truck units)Trailer unitTruck unitHigh speed start (Truck unit)Low speed start (Trailer unit)Belt driven fansElectric fan motorsCNF10 --- Not UsedCNF11OFFONOut-of-range alarmOut-of-range alarm and unit shut downFunctions normalFunctions lockedCNF12 --- Not UsedCNF13 --- Not UsedCNF14 --- Not UsedCNF15 --- Not UsedCNF16OFFONAlt aux alarm onlyAlt aux alarm shut unit down62-028844-20
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TABLE OF CONTENTS (CONT’D)Section
Page 7 and 8:
LIST OF ILLUSTRATIONSFigurePage4-18
Page 9 and 10:
61 2 3 4 57 811 1091. Muffler2. Eng
Page 11 and 12:
213 4 58 106793 41. Run-Stop Switch
Page 13 and 14:
113214345678910151617111812191. Mai
Page 15 and 16:
1231. Fault Light2. Standby Power L
Page 17 and 18:
e. EvaporatorsThe compartments of t
Page 19 and 20:
1.2 ENGINE DATAEngine Model CT4-134
Page 21 and 22: 1.7 SAFETY DEVICESSystem components
Page 23 and 24: 2 3 4 5 6 7 8 9 101FUNCTIONO ISETPO
Page 25 and 26: 1.8.6 FUNCTIONAL PARAMETERSThe func
Page 27 and 28: Engine HoursThe number of diesel en
Page 29 and 30: Coolant Temperature Sensor AlarmThe
Page 31 and 32: g. Minimum On-TimeThe engine is all
Page 33 and 34: 1.12.3 Hot Gas Bypass Unloadera. Ma
Page 35 and 36: 1.14 REFRIGERANT CIRCUIT DURINGCOOL
Page 37 and 38: 1614513LSV31715HGV31614513LSV21715H
Page 39 and 40: 1614513LSV3 (NC)1715HGV3 (NC)161451
Page 41 and 42: 2.2.2 MANUAL STARTINGa. Starting In
Page 43 and 44: 2.6 CONTROL CIRCUIT OPERATION --STA
Page 45 and 46: FALLING TEMPERATURERISING TEMPERATU
Page 47 and 48: 62-028842-8Table 2-3. 3 Compartment
Page 49 and 50: INDICATION/TROUBLEPOSSIBLE CAUSESRE
Page 55 and 56: 4.2 MAINTENANCE SCHEDULE (TRAILER)U
Page 57 and 58: 1105432shaft). Energize solenoid fo
Page 59 and 60: . Electrical Pump (See Figure 4-4)T
Page 61 and 62: a. Alternator V-Belts (Trailer Unit
Page 63 and 64: 4.7 PUMPING THE UNIT DOWN ORREMOVIN
Page 65 and 66: 1. Suction Line2. Equalizer Line3.
Page 67 and 68: k. Slide compressor enough to clear
Page 69 and 70: . Solenoid Coil ReplacementNOTEThe
Page 71: 4.18.2 Solenoid Valve -- Sporlana.
Page 75 and 76: 4.25 5KW GENERATOR -- TRAILERThe 5K
Page 77 and 78: 4.27 SERVICING PHASE SEQUENCEWARNIN
Page 79 and 80: 4.30 THERMOSTATIC EXPANSION VALVETh
Page 81 and 82: Table 4-7. R-404A Pressure -- Tempe
Page 83 and 84: 62-028845-2Figure 5-1. Truck Units
Page 85 and 86: 5-4Figure 5-2. Truck Units --- Elec
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Truck/Trailer Refrigeration Unit - Sunbelt Transport Refrigeration

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