Woodward 2301E, Инструкция по установке и эксплуатации, Страница: 98 / 182

2301E Digital Control Manual 26641
88 Woodward
07 GAIN SLOPE dflt = 0.00 (-50.00
–50.00)
Sets the percent output above which the Gain Slope becomes effective. It should
usually be set just above the minimum load output. (See Figure 4-3.)
08 GAIN BREAKPOINT dflt = 20.0 (0.00
–100.00)
Changes Gain as a function of actuator output. Since actuator output is
proportional to engine load, this makes Gain a function of engine load. Gain
Slope operates in conjunction with the Gain Slope Breakpoint adjustment to
increase (or decrease) Gain when percent Actuator Output is greater than the
breakpoint. This compensates for systems having high (or low) gain at low load
levels. This allows the Gain setting to be lower at light or no load for engine
stability, yet provide good control performance under loaded conditions (see
Figure 4-3.)
Figure 4-3. Control Gain as a Function of Fuel Demand (Load)
09 SPEED FILTER FREQ 1 (HZ) dflt = 12.00 (4.00
–20.00)
Adjusts the cutoff frequency of a low-pass filter used on the engine speed
sensing input (see Figure 4-4). To use this feature set the cutoff frequency below
15.9 Hz. The filter is used to attenuate engine firing frequencies. To calculate the
desired filter cutoff point, use the following formulas:
camshaft frequency = (engine rpm)/60 [for 2-cycle engines]
= (engine rpm)/120 [for 4-cycle engines]
firing frequency = camshaft frequency x number of cylinders
Initially set the filter frequency to the firing frequency.