Woodward GECO, Technical Manual, Page: 76 / 90

GECO

Stoichiometric Manual 03554
68 Woodward
Configuration and Calibration
These instructions assume that the engine is in good operating condition and the
mechanical carburetor has been properly installed and calibrated.
Control Configuration Before Engine Start
1. Apply power to the control.
2. Connect a Windows compatible computer to the control via the RS-232
cable. Start the PC Tool software described in Chapter 6.
3. Enter the password to get full access to the configuration and calibration
screens. Go to the Configuration screen on Screen 2.
a. Enable the appropriate sensors for your situation.
b. Enable the valve or valves for your situation. Check that the Run
Default valve position is set at 35% and the Crank Default position is
set at 35%.
c. Enter the calibration values for the MAP sensor if needed and verify the
MAP sensor is reading atmospheric pressure.
d. Enable the desired alarm and shutdown functions.
e. Enter the engine specific parameters:

cylinders

displacement

rated power

rated MAP

rated rpm

rpm source

rpm pulse/rev.
4. Move to the Monitor screen, Screen 1. Check that the cursor is highlighting
the ClearAll label and press the Enter key. Check to see that all faults are
cleared and remain clear.
5. Set the circuit board toggle switch to Open Loop. Go to the Valve-Learn table
on Screen 4, upper right corner. Check that the default valve settings are set
at 0%. The default valve settings will hold the valve closed so that at initial
start up the engine will run on the mechanical carburetor only.
Calibrate Open Loop Valve Table below 50% Load
6. Start the engine.
7. Verify the speed measurement to confirm the correct Pulse/rev.
8. After the engine has warmed up, record the current Mdot_fuel value and
enter this value in the first point of the Valve-Learn table.
9. Increase speed to the maximum rated speed of the engine. Record the
current Mdot_fuel value and enter this value in the second point of the Valve-
Learn table.
10. Ramp the engine load up to approximately 50%. Record the current
Mdot_fuel and the Mdot_air values. Enter the Mdot_fuel value in the third
point of the Valve-Learn table. Enter the Mdot_air value into the Mdot_air
breakpoint parameter.