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| Illustration 1 | g00558220 |
(1) Air Start Push Button. (2) Engine Control Switch. (3) Alert Indicators. (4) Master Power Switch. (5) Lamp Test Switch. (6) Throttle Control Knob. (7) Emergency Kill Switch. (8) Transmission Shifter. (9) Cement Metering Valve. | |
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| Illustration 2 | g00558651 |
(10) Circuit Breakers. (11) Alert Indicators. (12) Over Pressure Relays. (13) Terminal Blocks. | |
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| Illustration 3 | g00558661 |
(14) Diagnostic Indicator For The Front Engine. (15) Check Unit Indicator For The Front Engine. (16) Torque Converter Lockup Indicator For The Front Engine. (17) Torque Converter Lockup Indicator For The Rear Engine. (18) Check Unit Indicator For The Rear Engine. (19) Diagnostic Indicator For The Rear Engine. (20) Electrical Converter For The Front Engine. (21) Electrical Converter For The Rear Engine. | |
Throttle Control Knob
The throttle control knob is used to control the speed of the engine. Turning the knob to the full counterclockwise position will place the engine at idle. The full clockwise position is rated speed. The throttle control knob is connected to a potentiometer that varies a resistance. The potentiometer alters the voltage signal to the electrical converter. The electrical converter provides the engine with a throttle signal that is a PWM signal.
The throttle control knob has an additional feature. In the event of an over pressure condition, the throttle signal will be interrupted and the engine will drop to idle speed. The throttle control knob will be inactive until the over pressure condition is reset. To reset an over pressure condition, verify that the reading on the digital gauge is below the trip point. Then rotate the throttle control knob to the full counterclockwise position. This will reset the over pressure condition. When the condition is reset, the throttle control will be restored to the throttle control knob.
Engine Control Switch
The engine control switch enables the engine to start. The engine control switch needs to be in the RUN position. When you place the switch in the KILL position, the fuel will shut off to the engine. The engine will perform a normal stop.
Alert Indicators
The alert indicators are provided in order to give the operator a visual indication of the status of the CPS361 Cement Pumper. The alert indicators provide a indication for the following systems: torque converter lockup, check unit and engine diagnostic codes.
Torque Converter Lockup - This indicator will illuminate when the transmission has reached lockup. This will signal that the transmission is ready for load.
Check Unit - This indicator will illuminate when a skid parameter is out of range or the engine ECM has experienced a fault. The operator should check the gauges for a parameter that is out of range. Additionally, check the engine ECM for diagnostic codes.
Engine Diagnostic Code - This alert indicator is used to display flash codes for the engine. The flash codes are two digits that represent a diagnostic code. The indicator will blink for the first digit of the flash code. The indicator will pause for 5 seconds. Then blink for the second digit. Flash codes should only be used for a general idea of a problem. For a list of Diagnostic Flash Codes, see Systems Operation, "Engine Electronics".
Lamp Test Switch
The lamp test switch is used to verify the operation of the alert indicators. This is a momentary switch. When the switch is placed in the UP position, all the indicators will illuminate. If an indicator is not working, check the termination at the base of the lamp. Also check the corresponding terminal block inside the control panel.
Master Power Switch
The master power switch is used to distribute 24 DCV throughout the control system. This switch must remain in the ON position in order for the unit to operate.
Air Start Push Button
The air start push button is a pneumatic switch that will activate the engine air start pilot valve. The air start push button should be pushed down in order to start the engine.
Transmission Shifter
The transmission shifter is a pneumatic switch that controls the gear ratio of the transmission. The transmission shifter can be serviced by opening the panel that is located on the front portion of the control panel.
Emergency Kill Switch
In the event of an emergency, the emergency kill switch is used to shut down the engines. To activate this switch, open the red protective cover and move the switch to the UP position. The emergency kill switch is a pneumatic switch that closes the air intake valve for both engines. Additionally, there is a pressure switch that is located inside the control panel that will sense the loss of air pressure when the emergency kill switch is activated. The switch sends an electrical signal to the engine ECM. The engine ECM will shut off the fuel to each corresponding engine.
Cement Metering Valve
The cement metering valve is located on the lower right hand portion of the control console. This valve is used to control the knife gate for adding dry cement when the DCS system is in the manual mode. The operator should use this valve for rough control of the density. For more accurate control, the operator should allow the DCS system to electronically control the density of the cement.
Circuit Breakers
The circuit breakers are located inside the control panel. The circuit breakers are used to protect electrical equipment in the event of a short circuit. The following table describes the function of each circuit breaker.
| Function Of The Circuit Breakers | ||
|---|---|---|
| Number Of The Circuit Breaker | Function | Rating |
| 1 | Main Circuit Breaker | 20 Ampere |
| 2 | Unswitched Power To Front Engine ECM | 6 Ampere |
| 3 | Unswitched Power To Rear Engine ECM | 6 Ampere |
| 4 | Switched Power To Front Engine ECM | 15 Ampere |
| 5 | Switched Power To Rear Engine ECM | 15 Ampere |
| 6 | Switched Power To System Controls | 6 Ampere |
Terminal Blocks
Terminal blocks are used to distribute the control and power to the control system. Terminal blocks for diodes are terminal blocks with an internal diode. The terminal blocks for diodes provide coil suppression for relays. The blocks also control the logic for the alert indicators.
Over Pressure Relays
The high pressure relays are located inside the control panel. The relays provide a throttle interrupt switch when the discharge pressure has exceeded the over pressure limit. The relays activate when the digital pressure gauge senses an over pressure condition. This activation of the relay opens the throttle signal between the electrical converter and the engine ECM. Therefore, the engine will go to idle. This condition will be reset when the pressure has dropped below the threshold and the throttle control knob is returned to the full counterclockwise position.
Electrical Converter (Pulse Width Modulated)
Electrical converters are used to generate the throttle signal to the engine ECM. The electrical converter inputs a voltage signal and the electrical converter outputs a pulse width modulated signal. The engine uses the duty cycle of this PWM signal to control the speed of the engine. The potentiometer for the throttle control is connected to terminals "1", "2" and "3". Battery power is supplied to "+B" and "-B". The signal output is terminal "S". An oscilloscope can be used to verify the output of the electrical converter. The engine ECM needs a duty cycle between 5 and 10% to operate in idle. The engine ECM needs a duty cycle that is greater than 90% to operate at the rated speed.