PLATE-CONTROL 3559785 - Caterpillar

Illustration 21 g03702704
Block Diagram of the Output Components for the Electronic Control System
(1) Engine Electronic Control Module (ECM)
(2) Machine Electronic Control Module (ECM)
(3) Switch Panel
(4) Operator Monitor
(28) Travel Speed Solenoid Valve
(29) Hydraulic Lock Solenoid Valve
(30) Power Shift Current PRV
(31) Boom Regeneration PRV
(32) Fine Swing Solenoid
(33) Boom Up Limit REPRV
(34) Bucket Lock Solenoid Valve
(35) Medium Pressure Retract
(36) Quick Coupler Solenoid Valve
(37) Medium Pressure Extend
Illustration 22 g03702612
Output connections for the Switch Panel
(3) Switch Panel
(42) Quick Coupler Uncoupling Solenoid
(44) Travel Alarm
(45) Fault AlarmThe 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 23 g03792635The values in Table 11 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 11
Rated Voltage 12 VDC
Coil Resistance for Travel Speed Solenoid 8.8 0.4Ω (T = 25° C)
Coil Resistance for Hydraulic Lock Solenoid 7.1 0.2Ω (T = 25° C) The On/Off solenoids include:
Travel speed solenoid
Hydraulic lock solenoidProportional Reducing Solenoid Valve
Illustration 24 g02703776The values in Table 12 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 12
Current Range 0 mA ~ 700 mA
Coil Resistance 11.5 0.5Ω (T = 20° C)
Illustration 25 g02263554
A - Port pressure (kPa) vs Current (mA)
The proportional reducing solenoid valve is used on machines equipped with tool control. The P-Port is blocked and does not allow pressure to the A-port. Therefore, the machine ECM must apply current to the PRV to send pressure to the A-port of the PRV.Reverse Proportional Reducing Solenoid Valve
Illustration 26 g02304374
Valve cutaway, hydraulic schematic symbol, and electrical connector designation
The values in Table 13 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 13
Current Range 0 mA ~ 700 mA
Coil Resistance 11.5 0.5Ω (T = 20° C)
Illustration 27 g02304414Reverse PRV's have the P-port open to the A-port with no current applied. Therefore, the machine ECM applies current to the PRV to decrease the pressure at the A-port.The reverse PRV's include:
Boom Regeneration PRVData Link
Cat Data Link
The Cat Data Link is an input and an output of the Machine ECM. The Cat Data Link connects to the Machine ECM. The data link is designed to carry communications between the controller and the monitor. The data link is not a visible component. The data link consists of internal control circuits and a harness wiring. The data link is bidirectional. The controller can receive information and the controller can send information through the data link. The controller sends information about the fuel level, temperature of the engine coolant, and many other signals to the monitor panel.CAN Data Link
The CAN data link is used for communication between the following modules: Machine ECM, Switch Panel and Monitor. Two 120 Ohm terminating resistors must be installed in the wiring harness in order for the CAN data link to function properly.Action Alarm
The action alarm SOUNDS to alert the operator when a high emergency condition is present. For example, the engine oil pressure decreases below a set