CUP-BEARING 1B4038 - Caterpillar

[ OPTIONAL USE]
The thermocouple module is not a required module.General Information
Thermocouples, which consist of a probe that is connected to two wires, are devices that are used for measuring relatively high temperatures. The probe is placed a specific distance away from the heat source that is to be measured. The wires are connected to a measuring device.The wires are made up of dissimilar metals that are connected at two different junctions. The first junction is for measuring the temperature and the second junction, which is attached to the thermocouple module, is used as a reference. When the two metals are joined, a voltage is generated that relates to the difference in temperature between the two junctions.The thermocouple module reads the voltage and then calculates the temperature in "Celsius". After the calculations are complete, the thermocouple module broadcasts the information onto the J1939 data link. Once the calculations are on the data link, the EMCP 3 reads the information. The EMCP 3 will display the information on the display screen, eliminating the need for a pyrometer or similar separate display unit.Thermocouples are given a "Type" designation that is based on the range of temperatures that the thermocouple can accurately measure. The thermocouple module can read 20 reference inputs from either "Type-J" or "Type-K" thermocouples.Diagnostics
The thermocouple module can generate events and diagnostics. The thermocouple module can store up to 20 diagnostic log entries that can be viewed from the EMCP 3. The generated events and diagnostics are maintained in non-volatile memory in order to ensure availability after a power loss. The format for each of the log entries is listed in Table 1.
Table 1
Diagnostic Log Entry Format    
Suspect Parameter Number (SPN) (1)    
Failure Mode Indicator (FMI) (2)    
Time of Last Occurrence    
Date of Last Occurrence    
Time of First Occurrence    
Date of First Occurrence    
Engine Run Hours First Occurrence    
Engine Run Hours Last Occurrence    
Number of Occurrences    
Security to Clear Log Entry    
( 1 ) Refer to Table 3 for possible code numbers.
( 2 ) Refer to Table 2 for possible code numbers.Twenty thermocouple inputs can be connected to a thermocouple module. The module can detect both open circuits and short circuits for any of the 20 inputs.Additionally, the module detects over temperature warnings and shutdowns, as well as under temperature warnings. The warnings are detected by comparing the measured temperature to the thresholds that are programmed in the module. The thresholds include low warning, high warning, and high shutdown temperature thresholds.The diagnostic messages listed in Table 2 are broadcast on the J1939 data link. The EMCP 3 controller has the following capabilities:
Reads the diagnostic messages
Provides an annunciation for the operator
Perform a soft shutdown of the engine as appropriateAny of the inputs can be disabled in order to prevent unnecessary diagnostic faults.
Table 2
FMI Codes - Thermocouple Module    
FMI    Description    
0     Thermocouple Input #n High Temperature Shutdown    
4     Thermocouple Input Sensor #n Short