5230B Excavator Machine Electronic Control System Sensors Caterpillar


Sensors
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1.1. Temperature Sensor (Hydraulic Oil)
2.1. Pressure Sensor (Automatic Lubrication)
3.1. Pressure Sensor (Implement)
4.1. Pressure Sensor (Swing Pump)
5.1. Pressure Sensor (Swing Brake)
6.1. Speed Sensor (Swing Motor)

Sensors provide information to the ECM about changing conditions. These conditions may be pressures and temperatures. The signal from the sensor changes in a proportional manner to the changing condition. The ECM recognizes the following sensor signals:

  • Frequency

  • Pulse width modulated

Temperature Sensor (Hydraulic Oil)




Illustration 1g00842499

Hydraulic Oil Temperature Sensor

The sensor is an input to the machine ECM. The sensor has a connector with three contacts. The sensor connects to connector J2-4 of the machine ECM. The sensor receives electrical power (8 DCV) from contact J2-12 of the machine ECM. The ground for the sensor is connected to contacts J1-15 and J1-16.

The temperature sensor is a pulse width modulated type of sensor. The pulse width modulated signal is an input to the ECM. This sensor generates a pulse width modulated signal. The duty cycle varies in proportion to the temperature of the oil. The frequency of this signal is constant at 5000 Hz. The ECM receives the pulse width modulated signal. The ECM measures the duty cycle in order to determine the temperature. A low duty cycle corresponds to a low temperature. A high duty cycle corresponds to a high temperature. The machine ECM provides +8 DCV to the temperature sensor for operating power.

The hydraulic oil temperature sensor tells the ECM the oil temperature of the hydraulic system. The ECM uses the hydraulic oil temperature to control certain machine functions. The following functions are carried out: "hydraulic oil cooling"function and "cooler bypass" function. The hydraulic oil temperature sensor is located in the pump suction line, closest to the engine.

Pressure Sensor (Automatic Lubrication)




Illustration 2g00842508

Automatic Lubrication Pressure Sensor

The automatic lubrication pressure sensor tells the machine ECM the pressure of the automatic lubrication system. The ECM uses the automatic lubrication pressure to determine the status of the automatic lubrication system. If the pressure is too high or too low, the Vital Information Management System will display a "category 2" warning. The automatic lubrication pressure sensor is located on a delivery line near the lubrication pump.

The pressure sensor is a pulse width modulated sensor. The pulse width modulated signal is an input of the machine ECM. The sensor connects to connector J2-6 of the machine ECM. This sensor generates a pulse width modulated signal. The duty cycle varies in proportion to the pressure of the lubricant in the delivery lines. The frequency of this signal is constant at 5000 Hz. The ECM receives the pulse width modulated signal. The ECM measures the duty cycle in order to determine the pressure. A low duty cycle corresponds to a low pressure. A high duty cycle corresponds to a high pressure. The machine ECM provides +8 DCV to the pressure sensor for operating power.

Pressure Sensor (Implement)




Illustration 3g00842235

Pressure Switch (Implement)

The sensor is an input to the machine ECM. The sensor has a connector with three contacts. The sensor connects to connector J2-23 of the machine ECM. The sensor receives electrical power (24 DCV) from the +battery circuit. The sensor ground is connected to contact J2-29.

The pressure sensor is used by the machine ECM to measure the actual pressure of the implement's hydraulic circuit. The signal from the sensor is a pulse width modulated signal. The machine ECM uses the duty cycle of the PWM signal to calculate the pressure. A low pressure is represented by a duty cycle less than 20 percent. A high pressure is represented by a duty cycle that is greater than 80 percent. The value of the calculated pressure is then sent to the VIMS ECM via the AVS data link.

Pressure Sensor (Swing Pump)




Illustration 4g00842235

Pressure Sensor (Swing Pump)

The sensor is an input to the machine ECM. The sensor has a connector with three contacts. The sensor connects to connector J2-14 of the machine ECM. The sensor receives electrical power (24 DCV) from the +battery circuit. The sensor ground is connected to contact J2-20.

The pressure sensor is used by the machine ECM to measure the actual pressure of the hydraulic circuit for the swing pump. The signal from the sensor is a pulse width modulated signal. The machine ECM uses the duty cycle of the PWM signal to calculate the pressure. A low pressure is represented by a duty cycle less than 20 percent. A high pressure is represented by a duty cycle that is greater than 80 percent. The value of the calculated pressure is then sent to the VIMS ECM via the AVS data link.

Pressure Sensor (Swing Brake)




Illustration 5g00842485

Pressure Sensor (Swing Brake )

The sensor is an input to the machine ECM. The sensor has a connector with three contacts. The sensor connects to connector J2-35 of the machine ECM. The sensor receives electrical power (24 DCV) from the +battery circuit. The sensor ground is connected to contact J2-24.

The pressure sensor is used by the machine ECM to measure the actual pressure of the pilot hydraulic circuit for swing brake. The signal from the sensor is a pulse width modulated signal. The machine ECM uses the duty cycle of the PWM signal to calculate the pressure. A low pressure is represented by a duty cycle less than 20 percent. A high pressure is represented by a duty cycle that is greater than 80 percent. The value of the calculated pressure is then sent to the VIMS ECM via the AVS data link.

Speed Sensor (Swing Motor)




Illustration 6g00842243

The sensor is an input to the machine ECM. The sensor has a connector with four contacts. The sensor connects to connector J2-38 of the machine ECM. The sensor receives electrical power (8 DCV) from the machine ECM. The sensor ground is connected to contacts J1-15 and J1-16.

The speed sensor is used by the machine ECM to monitor the speed of the swing motor. The sensor sends a signal to the machine ECM. The machine ECM reads the frequency of the signal in order to calculate the speed of the swing motor. The machine ECM uses the speed of the swing motor to determine the pressure that is required for the swing motor. The value of the calculated speed is then sent to the VIMS ECM via the AVS data link.

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