HOSE AS-GUARD 5464715 - Caterpillar

Inputs
The inputs describe the status of the machine systems. Two types of inputs exist. The inputs can be either a switch type or a sensor type. Switches provide an open, a ground, or a + battery signal to the inputs of the controller. Sensors (frequency, PWM, or voltage) provide a changing signal to the sensor inputs of the controller. The controller will recognize the following types of sensor signals:Frequency - The sensor will produce an AC signal (sine wave or square wave) that varies in frequency (Hz) as the condition changes.Pulse Width Modulated - The sensor produces a digital signal and varies the duty cycle as the condition changes. The frequency of the signal will remain constant.In some cases the operator is provided a manual switch that can be used to change a condition of the machine.Sensors
Low Pressure Sensors
Illustration 8 g02263393
Table 3
Operating pressure     10 MPa    
Supply Voltage     +5V    
Output signal     500 100 Hz (PWM)    
Output range     5% ~ 95%    Pilot Pressure Sensor
The pilot pressure sensor measures the pilot oil pressure. The pressure sensor sends a pulse width modulated signal (PWM) input to the machine ECM.High Pressure Sensors
Illustration 9 g02263513
Table 4
Operating Pressure     50 MPa    
Supply Voltage     +5V    
Output Signal     500 100 Hz (PWM)    
Output Range     5% ~ 95%    Outputs
The ECM responds to decisions by sending electrical signals to the outputs. The outputs can create an action or the outputs can provide information to the operator or the service technician.Solenoids
On/Off Solenoids
Illustration 10 g01158530
Table 5
Rated Voltage     24 VDC    
Coil Resistance     32.0 3.2Ω (T=20° C)    Data Link
Cat Data Link
The Cat Data Link is an input/output of the ECM. The data link uses the connector for the service port in order to communicate with the Caterpillar Electronic Technician. A data link connection is provided for the product link.Note: The control for the product link provides a global positioning system for the machine.The data link is bidirectional. The bidirectional link allows the ECM to input information and output information. The data link consists of the following parts: internal ECM circuits, the related harness wiring, the service tool connector and the connector for the product link.
The ECM receives commands from the Cat ET in order to change the operating modes. The Cat ET will read the service codes that are stored in the memory of the ECM. The Cat ET will clear the service codes that are stored in the memory of the ECM.
The ECM sends the input and the output information to the Caterpillar ET. CAN Data Link
A Controller Area Network (CAN) Data Link allows communication between the Machine ECM, Engine ECM, and the input and output devices of the switch panel. The CAN Data Link allows for bi-directional electronic signals to be passed among the controllers and the switch panel. The data link allows the Machine ECM to be connected to sensors and actuators connected to the switch panel. The Machine ECM can