Woodward 2301D, Инструкция по установке и эксплуатации, Страница: 48 / 130

2301D/2301D-EC Digital Control Manual 26247
40 Woodward
03 ACTUATOR COMPENSATION 1 dflt = 12.00 (0.01, 100.00)
Compensates for the actuator and fuel system time constant. Increasing
Compensation increases actuator activity and transient performance.
04 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 3-2).
05 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 3-2).
Figure 3-2. Control Gain as a Function of Speed Error