AUTOMATIC START-STOP ARRANGEMENT 1N8294 - Caterpillar

Over Voltage Cutoff
If the power supplied to the controller increases to a critical level of 43V or more, the over voltage cutoff activates the transistor in the controller to prevent damage.Watch Dog Timer (WDT)
The WDT monitors the function of the controller Central Processing Unit (CPU). If a problem occurs in the CPU, the WDT sends a signal to the CPU to reset and restart correct processing. If the problem persists, alarm indicators for the controller and monitoring system located on the monitor panel come on. Indicator lamp in the controller compartment comes on red. If this condition occurs, the machine operation can continue by activating the backup system in the interim. The Backup System is explained in the Backup System section of the module.Full Waterproof Controller
The controller contains printed circuit boards that are protected from water by a aluminum die-cast housing.Backup System
Introduction
The electronic controller has an operator activated backup system to allow operation of the pump and/or engine in case of electronic control system problems. The backup system consists of the governor backup to control the engine and the pump backup for pump control. The governor backup should be activated when a problem occurs in the electronic control system that controls the engine governor. The pump backup should be activated when a problem occurs in the electronic control system that controls the pump. During backup, pump output is equivalent to that of machine operation in power mode I or II.Operation
Backup Circuit Schematic (Controller In Normal Condition)
(1) Controller. (2) Governor backup switch. (3) Governor actuator. (4) Governor actuator drive circuit. (5) Speed change switch. (6) Pump backup switch. (7) Proportional reducing valve. (8) Proportional reducing valve drive circuit.When the controller is operating normally, the backup system should not be used. Governor actuator (3) is activated by governor actuator drive circuit (4) of controller (1). Proportional reducing valve (7) is activated by proportional reducing valve drive circuit (8). This is normal pump regulation.
Rear Of Right Console (Access Cover Removed)
(2) Governor backup switch. (5) Speed change switch.
Rear Of Left Console (Access Cover Removed)
(6) Pump backup switch.Governor backup switch (2) and speed change switch (5) are located in the rear of the right console. Pump backup switch (6) is located in the rear of the left console. When the controller is normal, governor backup switch (2) should be in AUT (not backup) position with speed change switch (5) upright. Pump backup switch (6) should be in AUT (not backup) position.Governor backup and pump backup can be controlled separately.Governor Backup
Monitor
(9) Character display. (10) Controller alarm indicator. (11) Monitor alarm indicator.If a problem occurs in the controller, which controls the engine governor, character display (9) will not display the correct engine speed dial setting. When this happens, the governor backup switch should be used to override the controller and the speed change switch should be used to manually set the desired engine speed.During governor backup operation, the character display will appear as shown: A : when governor backup is used alone.U : when both