WASHER 1373987 - Caterpillar

Illustration 1 g03888641
Block Diagram of the Electronic Control System
(1) Switch panel
(2) Fuel level sensor
(3) Hydraulic oil temperature sensor
(4) ATCH quick coupler switch
(5) Capsule filter plugged switch
(6) Water separator level switch
(7) Alternator-R Terminal
(8) Key switch
(9) ATCH stem 4 status
(11) Operator monitor
(12) Coolant temperature sensor
(13) Machine electronic control module (ECM)
(14) Hydraulic lock cancel switch
(15) Start detection
(16) Pump 1 pressure sensor
(17) Pump 2 pressure sensor
(18) Left J/S switch 1
(19) Left J/S switch 3
(20) Left J/S switch 4
(21) Right J/S switch 1
(22) Right J/S switch 4
(23) One touch low idle switch
(24) Travel pressure switch
(25) Engine ECM
(26) Engine speed sensor
(28) Engine oil pressure sensor
(29) Fuel filter plugged sensor
(30) User-defined shutdown switch
(31) Implement pressure switch
(33) Boom up priority pressure switch
(34) Joystick pressure switch
(35) Squeeze pressure sensor Sensors
Sensors provide information to the controller about changing conditions. Some types of information are listed: speed, temperature and fluid level. The sensor signal changes in a proportional manner. This change will represent the changing condition. 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 (PWM) that varies the duty cycle as the condition changes. The frequency of the signal will remain constant.Pressure Sensors
Pump 1 Pressure Sensor (Drive) and Pump 2 Pressure Sensor (Idler)
These sensors monitor the pressure of the drive and idler pumps of the machine. These sensors are used to send the work load input signal to the machine ECM. The machine ECM uses this information to determine how much power shift pressure to use. This information is also used to determine the use of the automatic speed control.Negative Flow Control (NFC) 1 & 2 Pressure Sensors (If Equipped)
The negative flow control sensors are used to monitor the pressure of negative flow control circuit. The NFC pressure sensors help determine the amount of work load as well as the joystick position.Other Pressure Sensors
The following pressure sensors are also used for the control of the excavator:
Fuel Filter Plugged Sensor
Engine Oil Pressure Sensor
Squeeze Pressure Sensor (If Equipped)Other Sensors
The following sensors are also used for the control of the excavator:
Engine Speed Sensor
Fuel Level Sensor
Hydraulic Oil Temperature Sensor
Coolant Temperature SensorSwitches
Joystick Controls
Right Joystick Switch 1/Right Joystick Switch 2/Left Joystick Switch 1/Left Joystick Switch 2
Use Cat® ET or the Operator Monitor to assign a specific function to each of these controls. The joystick controls use electrical signals to control the solenoids on the machine. The Machine ECM receives a signal from the switch. The ECM sends a pulse width modulated signal to shift the position of the spool within the solenoid. Left Joystick Switch 3
This location is the assigned location for the horn of the machine. The operator presses the button to sound the horn and alert those people in the area of the machine.One Touch Low Idle Switch (Right Joystick Switch 3)
The one touch low idle switch is located on the right joystick. The one touch low idle switch will automatically