3F3-72540-0 Tohatsu SPARK TESTER

An improperly calibrated control could cause an engine overspeed or other damage to the engine. To prevent possible serious injury from an overspeeding engine, read this entire procedure before starting the engine.
Set Point Programmer and Menus
The Set Point Programmer is a hand-held computer terminal that gets its power from the 701 control. The terminal connects to the 20 mA loop serial port on the control. To connect the terminal, slightly loosen the right hand screw in the cover over J1 and rotate the cover clockwise to expose the 9-pin connector. Then firmly seat the connector on the terminal into J1.The programmer does a power-up self-test whenever it is plugged into the control. When the self-test is complete, the screen will be blank. Press the SP (Space) key to display the part number and revision level of the software in the control. (The SP key also turns on the display backlighting.) Refer to this number and revision level in any correspondence with Woodward Governor Company (write this information in Appendix A).The set points or adjustments of the control are arranged in five menus. You access these menus with the A, B, C, D, and 1 keys. Pressing the appropriate key selects the first item on each menu.The programmer keys do the following functions (see Figure 4-1):
Figure 4-1. Set Point Programmer Functions Pressing the appropriate key (A, B, C, D, 1) selects the desired menu. To step through the menu, use the left and right arrow keys. The right arrow advances through the menu and the left arrow moves backward through the menu. The menus are continuous; that is, pressing the right arrow at the last menu item takes the menu to the first item, or pressing the left arrow at the beginning of the menu takes the menu to the last item.To adjust a set point, use the up arrow to increase the value, or the down arrow to decrease the value. Holding the up or down arrow longer than a few moments will cause the rate of change to increase. This is useful during initial setup where a value may need to be changed significantly.On the display menu, Menu D, the up or down arrow must be pressed to update the display. Holding down the up or down arrow allows continuous updating of the display for monitoring speed, actuator output, etc.Finally, use the "=" key to save entered values. After you are satisfied with all entries and adjustments, press the "=" key to transfer all new set point values into EEPROM memory. The EEPROM retains all set points when power is removed from the control.
To prevent possible damage to the engine resulting from improper control settings, make sure you save the set points before removing power from the control. Failure to save the set points before removing power from the control causes them to revert to the previously saved settings.
The control ignores all other keys on the Set Point Programmer.Menu (Set Point) Descriptions
Menu A - Dynamics Menu
Dynamic adjustments are settings that affect the stability and transient performance of the engine. There are two sets of dynamics provided. The set being used is selected by the Alternate Dynamics contact input. The following descriptions of each menu item apply to either set. Also see Figures 4-2, 4-3, and 4-4.1. Gain determines how fast the control responds to an error in engine speed from the speed-reference setting. The gain is set to provide stable control of the engine at light or unloaded conditions.2. Reset compensates for the lag time of the engine. It adjusts the time required for the control to return the speed to zero error after a disturbance. Reset is adjusted to prevent slow hunting and to minimize speed overshoot after a load disturbance.3. Compensation compensates for the actuator time constant. 4. Gain Ratio is the ratio of the Gain setting at steady state to the Gain setting during transient conditions. The Gain Ratio operates in conjunction with the Window Width and Gain adjustments by multiplying the Gain set point by the Gain Ratio when the speed error is greater than the Window Width. This makes the control dynamics fast enough to minimize engine-speed overshoot on start-up and to reduce the magnitude of speed error when loads are changing. This allows a lower gain at steady state for better stability and reduced steady-state actuator linkage movement.5. Window Width is the magnitude (in rpm) of a speed error at which the control automatically switches to fast response. The control does not use the absolute value of speed error, but "anticipated" speed error to make this switch. This method provides for quick switching to the high gain value when an offspeed occurs and early switching to the low gain value when recovering from the speed transient. This provides smoother switching than if the absolute speed error was used for the window.6. Gain Slope changes Gain as a function of actuator output. Since actuator output is proportional to engine load, this makes gain a function of engine load. Gain Slope operates in conjunction with the Gain Breakpoint adjustment to increase (or decrease) gain when percent actuator output is greater than the breakpoint. This compensates for systems having high (or low) gain at low load levels. This allows the Gain setting to be lower at light or no load for engine stability, yet provide good control performance under loaded conditions.7. Gain Breakpoint sets the percent output above which the Gain Slope becomes effective. It should usually be set just above the minimum load output. The Gain Breakpoint adjustment is common to both sets of dynamics.8. Speed Filter (9905-457 only) adjusts the cutoff frequency of a low pass filter used on the speed sensing input (see Figure 4-5). The filter is used to attenuate engine firing frequencies. To calculate the desired filter cutoff point, use the following formula: Always try to use the maximum frequency for best response. The speed filter is enabled or disabled using the "Filter" menu entry.
Figure 4-2. Control Gain