ROD AS 0676879 - Caterpillar

Illustration 1 g02278314Thermocouple Specifications
Electrical Specifications
Accept 5-32 VDC power (12 VDC or 24 VDC nominal)
Over voltage capability is 32 VDC for 1 hour at 85° C (185° F)
Power supply inputs are protected against transient surges and short circuits and are isolated from I/O
Three-way isolation is provided for the CAN line, inputs, and power supply
Burden is limited to less than 200 mA, inrush not to exceed 800 mA
Common mode rejection is -80 db@ 5V p-p (50-60 Hz)
Common mode input range is +/- 4 V minimum
Designed to meet relevant European standards for EMI/RFI/Immunity without the use of external filteringNetwork Communications Interface
Capable of operating on the EMCP 4 accessory CAN 2 data link
Node address is auto configurable
Optical isolation is provided for the CAN line
Retains current date and time relative to synchronization every 24 hours (or upon boot up) with equipment system time via an explicit command from the EMCP 4 or Cat ET when the GSC is not available. Synchronization time is accurate to within 1 sec
Includes a watchdog timer to automatically reboot should the microprocessor lock
Module operates normally with loss of communication link, retaining configured values and error codes in non-volatile memory
Configuration and firmware updates are accomplished with Cat ET over the CAN networkThermocouple Wiring
Illustration 2 g02278333
Connector Contact Description
(1) Power
(2) CAN High
(3) CAN Low
(4) Ground
(5) Shield
(6) Not Used
(7) Not Used
(8) Not Used
Illustration 3 g02278334
Thermocouple Sensor Wiring
Thermocouple Configuration
The thermocouple module is field programmable using Cat ET. It is also flash programmable to update software using Cat ET.
Illustration 4 g02278335The service tool software must be installed on a Windows PC. The communication adapter must be connected between the PC and the CAN data link on which the target thermocouple module is connected. When connecting the thermocouple module, the user will first see the "ECM Summary" screen shown in Illustration 4.The service tool configuration tool contains setpoints for configuring the thermocouple module identification, as well as the thermocouple inputs.Note: "ECU Instance #1" is reversed for the accessory data link (CAN 2), while "ECU Instance #2" is reserved for the primary data link (CAN 1).
Illustration 5 g02278336Illustration 5 shows the ECM identification parameters list. This list shows the ECM serial number (read-only) of the module that is connected, and allows for configuration of the ECU instance. Each thermocouple module on the data link must have a unique ECU instance. If ECU instances are duplicated, one of the modules must be disconnected and the other reconfigured to a different ECU instance.
Illustration 6 g02278337Upon changing the ECU instance, Cat ET will automatically reconnect to the data link, and the thermocouple module name should reflect the new ECU instance. In this example, as shown in Illustration 6, the module was previously named "Thermocouple Module #1", and after the ECU instance is changed to 2 and the service tool reconnects, the name reads "Thermocouple Module #2".Configuring Thermocouple Inputs
Illustration 7 g02278338Illustration 7 shows the "Thermocouple Input #1" configuration list. All 20 thermocouple inputs have identical parameters and options.The "Sensor Type Configuration" selects either a J or K type configuration. Select the appropriate configuration based on the type