5230B Excavator Machine Electronic Control System Switches Caterpillar


Switches
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5230B Excavator Machine Electronic Control System [RENR3375]
ELECTRICAL AND STARTING SYSTEM
SWITCH GP
5230B Excavator Machine Electronic Control System Switches
1.1. Rocker Switch (Travel Alarm Cancel)
2.1. Switches of the Control Handles
3.2. Right Hand Control Handle
4.3. Switch (Bottom Dump Open)
5.3. Switch (Boom Float)
6.2. Left Hand Control Handle
7.3. Switch (Bottom Dump Close)
8.3. Switch (Horn)
9.1. Switch (Automatic Engine Speed Control)
10.1. Pressure Switches
11.2. Pressure Switch (Swing)
12.2. Pressure Switch (Implement)
13.2. Pressure Switch (Boom Up)
14.1. Pressure Switch (Boom Float)
15.1. Ladder Position Switches
16.1. Switch (Service Console)

Switches provide the following types of information to the inputs of the machine ECM: open signals, ground signals and + battery signals. Switches are open or closed.

  • When a switch is open, no signal is provided to the corresponding input of the ECM. This "no signal" condition is also called "floating".

  • When a switch is closed a signal is provided to the input of the ECM.

Rocker Switch (Travel Alarm Cancel)




Illustration 1g00673991

Travel Alarm Cancel Switch

The travel alarm cancel switch tells the ECM that the operator needs to silence the travel alarm. The switch is a single pole single throw switch. The ECM circuit is grounded when the operator presses the switch into the ON position.

The machine ECM will not respond to the travel alarm cancel switch until the travel alarm has been on for 10 seconds. The travel alarm remains on until 10 seconds pass. The travel alarm will then turn off.

Switches of the Control Handles

Right Hand Control Handle




Illustration 2g00816224

Right Hand Control Handle

(1) Switch (Bottom Dump Open)

(2) Switch (Boom Float)

Switch (Bottom Dump Open)

The switch (bottom dump open) is an input of the machine ECM. The switch is connected to connector contact J1-23. The switch allows the operator to open the bottom dump. The contacts of the switch are closed to ground when the operator squeezes the trigger. This causes the machine ECM to energize the bucket dump open solenoid.

Switch (Boom Float)

The switch (boom float) is an input of the machine ECM. The switch is connected to connector contact J1-35 of the machine ECM. The switch allows the bucket to float across the ground. The contacts of the switch are closed to ground when the operator presses the button. This causes the machine ECM to energize the boom float relay. The boom float relay then energizes the boom float solenoid.

Left Hand Control Handle




Illustration 3g00816224

Left Hand Control Handle

(1) Switch (Bottom Dump Close)

(2) Switch (Horn)

Switch (Bottom Dump Close)

The switch (bottom dump close) is an input of the machine ECM. The switch is connected to connector contact J1-24. The switch allows the operator to close the bottom dump. The contacts of the switch are closed to ground when the operator squeezes the trigger. This causes the machine ECM to energize the bucket dump close solenoid.

Switch (Horn)

The horn switch is an input of the machine ECM. The switch is connected to connector contact J1-25. The switch allows the operator to sound the horn. The contacts of the switch are closed to ground when the operator presses the button. This causes the machine ECM to energize the horn solenoid.

Switch (Automatic Engine Speed Control)




Illustration 4g00673899

Switch (Automatic Engine Speed Control)

The Switch (Automatic Engine Speed Control) tells the machine ECM the status of the "Automatic Engine Speed Control" function. This switch is read by the machine ECM and the information is sent to the engine ECM via the AVS data link.

Pressure Switches




Illustration 5g00816364

Pressure Switch (Swing)

Pressure Switch (Implement)

Pressure Switch (Boom Up)

Pressure Switch (Swing)

The swing pressure switch tells the ECM that the operator wants to swing the machine. The ECM uses the swing pressure switch in order to enable several machine functions. The ECM uses the swing pressure switch in order to disable several machine functions. The following functions are carried out: swing brake and the AESC signal.

When the operator initiates a swing function the pressure in the swing hydraulic system increases. The hydraulic pressure opens the swing pressure switch. The ECM is grounded when there is no pressure in the swing hydraulic system. The swing pressure switch is on the pilot manifold.

Pressure Switch (Implement)

The implement pressure switch tells the ECM that the operator needs to move: boom, bucket and stick. The ECM uses the implement pressure signal in order to enable several machine functions. The ECM uses the implement pressure signal in order to disable several machine functions. The following functions are carried out: swing brake, high pressure control and AESC signal .

The pressure in the implement hydraulic system increases when the following functions are initiated: boom, bucket and stick. The hydraulic pressure opens the implement pressure switch. When there is no pressure in the implement hydraulic system the implement pressure switch closes. The ECM input is grounded. The implement pressure switch is located in the main implement valve at the center of the machine.

Pressure Switch (Boom Up)




Illustration 6g00869630

The pressure switch (boom up) is an input of the machine ECM. The switch is connected to connector contact J1-22. The switch is used to control the speed of the hydraulic demand fan and the engine's demand fan. The engine's demand fan is controlled by the engine ECM. The engine ECM receives the status of the switch via the AVSdata link.

The speed of the fans is determined by the status of the switch. The status of the switch is open or closed. The status of the switch tells the control if the operator is using a "boom up" function. Refer to the Systems Operation, "Hydraulic Oil Cooling Function" section of this manual for additional information.

Pressure Switch (Boom Float)

The boom float pressure switch is an input of the machine ECM. The switch connects to connector contact J1-21. The status of the switch allows the machine ECM to activate the "boom float" function. When the operator requests the boom float function, the control checks the status of the boom float pressure switch. If the switch is open, the control activates the boom float function. The boom float function is only active when the switch for the boom float is closed and the pressure switch (boom float) is open.

Ladder Position Switches




Illustration 7g00875222

Left Ladder Position Switch

The ladder position switch is seen by the ECM. The ECM knows if the ladder is up or the ladder is down. The ECM uses the position of the ladder in order to carry out the following functions:

  • Travel brake

  • Swing brake

The ladder position switch is an electronic switch that is magnetically activated. The switch consists of two pieces: a switch that is mounted to the inside of the frame rail and a magnet that is mounted to the ladder. When the ladder is down, the output of the ladder position switch is floating. When the magnet is positioned in front of the switch the switch output closes as the ladder goes up. The magnet is moved away from the switch when the ladder goes down.

A green indicator and a yellow indicator on the switch serve as troubleshooting aids. The green indicator is on whenever the key start switch is on. The yellow indicator is on when the ladder is up.

Switch (Service Console)




Illustration 8g00875222

The position switch (service console) is an input of the machine ECM. The switch connects to connector contact J1-22. The position switch (service console) is an electronic switch that is magnetically activated. The switch tells the machine ECM that the service console is in the UP position. The switch consists of two pieces: When the service console is down, the output of the position switch (service console) is open. As the service console goes up the magnet passes the switch. This causes the output of the switch to close to ground. The output of the switch remains closed until the magnet passes the switch. This occurs when the service console goes down. The switch has a connector with three contacts.

A green indicator and a yellow indicator on the switch serve as troubleshooting aids. The green indicator is ON whenever the key start switch is ON. The yellow indicator is ON when the switch is closed to ground. This indicates that the service console is in the UP position.

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