PLATE & FILM GP 1400127 - Caterpillar

Illustration 1 g03419848
Propel Electrical Schematic
(1) From display/keypad fuse
(2) From propel/steer fuse
(3) From engine main fuse
(4) From machine ECM 1 fuse
(5) Machine ECM number-one
(6) Parking brake switch
(7) Keypad
(8) Propel lever
(9) Display
(10) Engine ECM
(11) CAN resistor "1"
(12) CAN resistor "2"
(13) Back-up alarm relay
(14) Back-up alarm
(15) Propel reverse solenoid
(16) Propel forward solenoid
(17) Shift solenoid
(18) Interlock valve solenoid
(19) RH front drum speed sensor
(20) LH rear drum speed sensor When the electrical disconnect switch is in the ON position, power transfers from engine main fuse (3) to the following terminals of engine ECM (10): "J1-7", "J1-8", "J1-15" and "J1-16". This voltage provides the main power source for the engine ECM. The engine ECM is grounded at the following terminals: "J1-1", "J1-2", "J1-3", "J1-9" and "J1-10".When the engine start switch is in the ON position, the machine ECM "1" fuse is energized. Power transfers from machine ECM "1" fuse (4) to the following terminals of machine ECM number-one (5): "2", "47", "48", "49" and "50". This voltage provides the main power source for the ECM and also provides the wake-up signal. The machine ECM number-one is grounded at terminal "1".When the engine start switch is in the ON position and the machine main power relay is energized, power transfers to the display/keypad fuse. Power transfers from display/keypad fuse (1) to the following locations:
Contact "1" and contact "5" of keypad (7)
Contact "2" of display (9)When the engine start switch is in the ON position and the machine main relay is energized, power transfers to propel/steer fuse (2). Power transfers from the propel/steer fuse to the following locations:
Contact "2" of propel lever (8)
Contact "5" of parking brake switch (6)
Contact "30" and contact "86" of back-up alarm relay (13).CAN Communication
Keypad (7), propel lever (8), display (9), engine ECM (10) and machine ECM number-one (5) communicate through a CAN. In order to prevent data loss in the communication lines, termination resistors are required at the ends of the CAN bus. CAN resistors (11) and (12) act as termination resistors. The CAN resistors absorb unwanted noise in the communication system which can result in abnormal machine operation.Differences in materials along the CAN bus can cause data pulses in the bus to reflect back through the bus. This reflection, also known as "jitter", creates unwanted noise in the CAN bus. Jitter in the communication lines between computers can distort the original data signals. The distortion can result in data loss.Data in the CAN bus can also be contaminated with radio frequency interference (RFI). This interference can be caused by a number of devices which operate on or near the machine. RFI creates noise in the communication lines which can also distort the original data signals and cause data loss.Parking Brake Control
Machine ECM number-one (5) monitors the circuits at terminal "6" and terminal "7" in order to determine the condition of parking brake switch (6). When terminal "6" is closed and terminal "7" is open, machine ECM number-one determines that the parking brake switch is in the OFF position. When the terminal