Woodward 721 - Chapter 6. Entering Control Set Points; Configure Menus

Manual 26004 721DSC for Marine Propulsion Application
Woodward
21
Chapter 6
Entering Control Set Points
CONFIGURE MENUS
To access the Configure menus, the engine must be shut down. Press the . key. The display
will show, “To select configure, press ENTER”. Press the ENTER key and the display
will show, “To shutdown I/O, press ENTER”. Press the ENTER key and this will allow
you into the Configure menus.
NOTE
The set points in the Configure menus must be set to the correct values before
starting the engine, otherwise the engine may overspeed or will not start.
1. Reverse Acting Act
This set point determines to which direction the actuator rotates when the actuator
output current from the 721 control increases. Setting “FALSE” will select Forward
acting output. In this case the actuator output current must be increased to increase fuel.
Setting “TRUE” will select Reverse acting output. In this case the actuator output
current must be decreased to increase fuel. A mechanical ballhead back-up governor (for
example, Woodward EGB or PGA-EG) is required for reverse-acting applications.
2. No.1 Gear Teeth
Set this to the number of teeth or holes on the speed sensing gear for speed sensor #1. If
the speed sensing gear is not rotating at the same speed as the crankshaft, this is the
number of gear teeth that will pass the speed sensor in one complete engine revolution.
3. No.1 Max Hz
This is the maximum frequency for speed sensor #1. Set the input frequency which will
be sensed when the engine is running at the Raise Limit or more.
4. Use No.2 MPU
Set this to “TRUE” when both speed sensors are used. Set this to “FALSE” when only
one speed sensor is used. When this set point is set to “TRUE”, only speed sensor #1 is
available.
5. No.2 Gear Teeth
Set this to the number of teeth or holes on the speed sensing gear for speed sensor #2. If
the speed sensing gear is not rotating at the same speed as the crankshaft, this is the
number of gear teeth that will pass the speed sensor in one complete engine revolution.
6. No.2 Max Hz
This is the maximum frequency for speed sensor #2. Set the input frequency which will
be sensed when the engine is running at the Raise Limit or more.