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COVER GP-CAB 4647035 - Caterpillar

4647035 COVER GP-CAB Caterpillar parts COVER
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Caterpillar 4647035 COVER GP-CAB

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Take care not to damage the insulation during installation. Take precautions against later damage from vibration, abrasion, pinch points, and liquids in conduits. Additionally, it is essential to use the following practices:
Keep high voltage wiring at least 30 cm (12 inch) away from the thermocouples and the wiring for the thermocouples. Never wire thermocouples with any other wiring from sources of high power.
For spark ignited engines, never wire thermocouples through the same conduit as the ignition wiring. Use spark plugs with resistors for lower electromagnetic interference (EMI). Install the thermocouples at least 30 cm (12 inch) away from wiring for the ignition.Avoid any additional junctions and/or splices in order to ensure that an accurate signal is transmitted to the exhaust temperature module.Unused Channels
The exhaust temperature module is capable of monitoring 24 channels. The exhaust temperature module is self-diagnostic. In order to avoid false diagnostics for the unused channels, the unused channels must be shorted. Do not wire the unused channels into the harness.For example, an eight cylinder engine with one turbocharger will typically use ten channels. Eight of the channels are used for thermocouples at the cylinder exhaust ports. One of the channels is used for the exhaust inlet to the turbocharger. The tenth channel is used for the exhaust outlet from the turbocharger. The remaining channels are not used.
Illustration 3 g01473737
Example of a jumper wire for an unused channelRefer to Illustration 3. Crimp a 186-3736 Connector Socket onto each end of a jumper wire. Install the jumper wire onto the appropriate pins for each channel that is not used.Alarm for "Deviation from Average"
The Society of Automotive Engineers inc. (SAE) does not have a Parameter Group Number (PGN) or Suspect Parameter Number (SPN) for "Deviation from Average". Caterpillar is using "Exhaust Gas Temperature" in order to represent "Average Cylinder Temperature". The PGN is 65270. The SPN is 173.Testing the Circuits for the Thermocouples
Disconnect the wiring for a thermocouple from the exhaust temperature module before you test the wiring with an ohmmeter or another instrument. This will prevent possible damage to the exhaust temperature module's sensitive circuitry.Wiring for the Output Switches
The exhaust temperature module contains two solid state output switches. Each output switch is rated for a maximum of 2 amperes at 35 VDC. The default configuration of each output switch is normally open.The output switches can be wired in order to activate alarms or shutdowns. For example, the number 1 output switch can be wired for an alarm and the number 2 output switch can be wired for a shutdown.Refer to Table 3 for identification of the pins for the output switches.
Table 3
Pins for the Output Switches    
Pin    Output Switch    Function    
58     2     Return    
59     Output
60     1     Output    
61     Return Refer to Illustration 4 for an example of the wiring for the output switches. In this example, the outputs are used to control relays.Note: Flyback diode protection for the two output switches is built into the ETM

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