Woodward 2301D, Инструкция по установке и эксплуатации, Страница: 57 / 130

Manual 26247 2301D/2301D-EC Digital Control
Woodward 49
The table below aids in collecting the data for the Gain Plot. When entering
the values into the control, the software will not allow overlapping the
breakpoint values (that is, Breakpoint A must be less than breakpoint B,
which must be less than breakpoint C, etc).
Gain settings reflect the sensitivity of the engine load to fuel demand as
shown in Figure 3-7. Flat portions of the engine plot will require relatively
small values of gain, steep portions of the plot will require larger gain
numbers (actuator has to move a lot to pickup small amount of load).
d. Create a plot of the system by plotting PID GAIN as a function of load. A
typical result is shown in Figure 3-7.
The following table may help in the construction of the plot. Use as many
load steps as possible, it is not necessary to use all 20 points given below.
Load/RPM Point
Gain (for good
control) Actuator or kW Output or
Speed
Load/RPM Point 1
Load/RPM Point 2
Load/RPM Point 3
Load/RPM Point 4
Load/RPM Point 5
Load/RPM Point 6
Load/RPM Point 7
Load/RPM Point 8
Load/RPM Point 9
Load/RPM Point 10
Load/RPM Point 11
Load/RPM Point 12
Load/RPM Point 13
Load/RPM Point 14
Load/RPM Point 15
Load/RPM Point 16
Load/RPM Point 17
Load/RPM Point 18
Load/RPM Point 19
Load/RPM Point 20
2. Set Gain A to the value recorded at point 1b. This should give good control at
no load.
3. Use the plot of the engine to determine the linearity of the fuel system. This
curve should be linearized between inflection points as shown in Figure 3-7.
4. Set the Gain A Breakpoint for the actuator output at or slightly below the load
value at the min load point. Set the GAIN value at breakpoint A.
5. Set the Gain B Breakpoint at the point slightly above the first inflection point
in the load plot. Gain B should now be adjusted to obtain good control at the
inflection point B. Note: you may already have obtained the correct value in
Step 1c.
Be prepared to change the dynamics settings since the actuator
bump transient may stimulate instability, which could result in an
overspeed condition.
BUMP ENABLE must be set to TRUE to enable the BUMP ACT
function. See the ACTUATOR BUMP menu.