Woodward 2301E, Инструкция по установке и эксплуатации, Страница: 97 / 182

Manual 26641 2301E Digital Control
Woodward 87
02 RATED PROP GAIN 1 dflt = 2.00 (0.001
–100.00)
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
rated speed and light or unloaded conditions. The gain value is linear between
the Idle Prop Gain tunable and the Rated Prop Gain tunable.
03 RESET 1
dflt = 1.00 (0.01
–100.00)
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.
04 ACTUATOR COMPENSATION 1 dflt = 0.10 (0.01
–100.00)
Compensates for the actuator and fuel system time constant. Increasing
Compensation increases actuator activity and transient performance.
05 WINDOW WIDTH 1 (RPM) dflt = 60.00 (1.00
–200.00)
This is the magnitude (in rpm) of speed error at which the control automatically
switches to fast response. The control uses the absolute value of speed error to
make this switch. The absolute value is the difference between the speed
reference and the speed. A window width that is too narrow results in cycling that
always factors in the gain ratio (see Figure 4-2).
06 GAIN RATIO 1
dflt = 1.00 (1.00
–10.00)
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 (see Figure 4-2).
Figure 4-2. Control Gain as a Function of Speed Error