PLATE & FILM GP 1400112 - Caterpillar

Power Distribution
Illustration 1 g03414535
Drum Offset Electrical Schematic
(1) From propel-steer fuse
(2) From machine ECM "1" fuse
(3) From display-keypad fuse
(4) Propel lever
(5) Steering angle position sensor
(6) Offset angle position sensor
(7) Rear clockwise solenoid
(8) Rear counterclockwise solenoid
(9) Front counterclockwise solenoid
(10) Front clockwise solenoid
(11) Steering shunt solenoid
(12) Machine ECM number-one
(13) Display
(14) Machine ECM number-two When the engine start switch is in the ON position, the machine ECM "1" fuse is energized.Power transfers from machine ECM "1" fuse (2) to the following terminals of the machine ECM number-one (12): "2", "47", "48", "49" and "50". This voltage provides the main power source for this machine ECM and also provides the wake-up signal. The machine ECM is grounded at terminal "1".Power transfers from machine ECM "1" fuse (2) to terminal "2" of machine ECM number-two (14). This voltage provides the main power source for the machine ECM number-two and also provides the wake-up signal. The machine ECM number-two is grounded at terminal "1".When the engine start switch is in the ON position and the machine main relay is energized, power transfers to propel-steer fuse (1) and to display-keypad fuse (3). Power transfers from the propel-steer fuse to contact "2" of propel lever (4). Power transfers from the display keypad fuse to contact "2" of display (13).CAN Communication
Machine ECM number-two (14), machine ECM number-one (12) and propel lever (4) communicate through the CAN lines.Steering Shunt Solenoid
Steering shunt solenoid (11) enables and disables the drum offset system. When the solenoid is energized, the steering shunt valve is closed and oil from the steering pump is routed to the offset control valve. In this case, the drum offset system is enabled. When the solenoid is de-energized, the steering shunt valve opens and hydraulic oil from the steering pump is sent directly to the hydraulic tank. In this case, the drum offset system is disabled.Drum Offset Controls
The drum offset system is a closed loop system that is position controlled. Steering angle position sensor (5) measures the angle of machine articulation and transmits this information to machine ECM number-one (12). Offset angle position sensor (6) measures the angle of the rear hitch. The machine ECM number-one computes an offset amount from these two signals.Drum offset is controlled by solenoids in the steering control valve and solenoids in the offset control valve. Each control valve has two solenoids. Front clockwise solenoid (10) and front counterclockwise solenoid (9) control the operation of the steering control valve. Rear clockwise solenoid (7) and rear counterclockwise solenoid (8) control the operation of the offset control valve.Machine ECM number-one (12) monitors the signals from propel lever (4) in order to determine the status of the offset control switches. The machine ECM number-one works with machine ECM number-two (14) in order to control the steering control valve and the offset control valve. When