These patented diagnostics offer users a means of continually monitoring spark plug wear and combustion stability without the addition of special ignition coils or high voltage probes.
The part number for this traditional CPU ingition system is Guascor Its installation allows for full access to the critical operational and diagnostic information and enhanced spark characteristic control resident in standard CPU systems.
This model is of particular interest to operators of large bore, low-BMEP engines that exhibit ignitability or combustion stability problems.
CPU - Words: 7, Pages: Preview Full text. This system is field-programmable and offers a variety of advanced control, emissions reduction, primary and spark diagnostics, self diagnostics, serial communications and engine protection features. Reference the installation instructions, form CPU II, for instructions regarding installation and mounting. These switches have isolated outputs and share one common return path which is not referenced to engine or power ground.
They will be in the open condition when the unit is unpowered. A typical application would be as a relay or solenoid coil driver. This output could be used as a signal to the control system to turn fuel on. Upon detecting a fault that would result in a self-shutdown of the ignition, this switch will open.
This output could be used as a signal to the control system to turn fuel off. Upon detection of a diagnostic fault or warning, this switch will open. This output is designed to control an alarm indicator or sounding device.
The Power LED flashes to indicate that the unit has power but is not operating correctly. The Power LED is off to indicate that the unit has no power. This port is normally used for communication to the optional Display Module. A PC personal computer or a PLC programmable logic controller can be connected to the RS port to perform remote monitoring or control functions.
The Ignition Module can be operated in a stand-alone mode, but diagnostic and control features would not be accessible. This logic level input is active when shorted to ground, and is used to control any combination of the following features: one-step retard, spark energy level or multi-strike option.
These features are enabled based on the special features configuration settings as described in the programming instructions, form CPU PI. This link communicates between the modules using a proprietary protocol. A sealed membrane keypad is used to accept user input. The LCD display and the keypad function together to provide an interactive user interface which prompts the user as different functions are selected. Reference Drawing for a description of the keypad.
All keypad adjustments, except individual offset timing adjustments are performed directly in non-volatile EEPROM memory. If either input is shorted to ground, then the MISC. INPUT functions are active. The LCD display always reverts back to one of the home screens after a keypad operation is completed or times out.
The home screen is designed to display the most critical operating parameters on one screen. READY 0rpm Additional data is provided on this screen to describe the selected mode of operation for the ignition. This signifies that the engine has stopped without any detected cause from the ignition system. The Ignition Module will continue to operate under a warning condition while alerting the operator of a potential problem in several ways: by turning on the Alarm LED in the Ignition Module and by changing the state of the Alarm Out switch switch opens.
The Display Module will display the Warning message. The various types of diagnostic warnings are described in section The ignition system will stop operating under a fault condition and will alert the operator to the problem in several ways: by changing the state of the Fire Confirm Out switch switch opens , by turning on the alarm LED inside the Ignition Module, by changing the state of the Alarm Out switch switch opens , by changing the state of the Fault Out switch switch opens , and by displaying the Fault message.
The various types of diagnostic faults are described in section FAULT 0rpm This screen indicates that the ignition is not firing because a shutdown input was triggered to shutdown the engine. The Fire Confirm Out switch will change state switch opens and the other outputs will function as described above based on the existence of faults or warnings. This adjustment can be equated to the manual timing switch of the Altronic CPU system. Adjustments made as described below will be in effect until another adjustment is made.
ESC 5. The minimum timing change is defined as follows. If N 6. Once the global timing mode menu is entered as described below, the status of each option can be viewed and changed.
When the current loop is on, the current loop value is displayed xx. When the current loop is off, the value is displayed xx.
The first screen below is displayed when one-step retard is both configured and is active. The second screen below is displayed when the one-step retard is configured but not active. The default configuration selects one-step retard to be controlled by the Misc. Input terminal. The additional retard would be implemented when the input is grounded.
The third screen below is displayed when the one-step retard feature is not configured. The actual engine timing is displayed on this screen so the effect of 1 step retard can be seen during adjustments if the Misc Input terminal is grounded. Adjustments made as described below should be considered temporary.
Note: In applications with narrow firing angles, the adjustment range may be limited. NOTE: 2. These functions can be accessed from the individual timing mode menu which can be entered as described below. When this is done, the ignition will load these offset settings every time the engine starts or reset is pressed. Reference section 7. The Setup menu can be entered as described below.
Note 1: A special feature can be selected during configuration to force Multi-Strike to be active below rpm, or when the Misc. Input is grounded. This feature is not active in a standard configuration. Note 2: The Multi-Strike feature is automatically turned off above rpm.
Note 3: The use of Multi-Strike firings may tend to accelerate spark plug electrode erosion. The energy levels are 75 millijoules E1 , millijoules E2 , millijoules E3. Note 1: A special feature can be selected during configuration to use the maximum energy level below rpm, or when the Misc Input is grounded. Note 2: The energy is automatically limited to E2 when Multi-Strike is active.
Note 3: The use of higher spark energy may tend to accelerate spark plug electrode erosion. The setpoint can be adjusted in increments of 10 rpm to a maximum of rpm. Both the reset position and the engine timing are displayed. Adjustments are made here to make the displayed timing match the actual spark timing as verified with a timing light.
This adjustment effects the displayed timing but does NOT change the actual timing of the firings. NOTE: Adjustment of this parameter should be done while individual cylinder offsets are all at zero. This feature can be used to provide limited protection from random changes by inexperienced operators. There are a total of 8 screens which can be rotated to the display using the NEXT key.
To exit to home screen. This test mode can fire all outputs in rotation, or individual outputs at a slow rate. This feature can be used to troubleshoot primary wiring and Output Module operation. Test mode will terminate if rotation of the engine is sensed. Diagnostic features do not function while in test mode. Pressing the enter key again is a confirmation of this action. Note: Display Module only: The Test-Mode is enabled by the user during initial setup of display module from PC terminal program.
The presence of a diagnostic fault will inhibit the ignition from firing. When a fault is detected several things will occur: - The ignition will stop firing. The ignition will continue to fire in the presence of a diagnostic warning. When a warning is detected, several things will occur: - The Alarm Out switch will open.
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