Woodward 2301D, Инструкция по установке и эксплуатации, Страница: 53 / 130

Manual 26247 2301D/2301D-EC Digital Control
Woodward 45
14 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).
15 SPEED FILTER FREQ 1 (HZ) dflt = 20.00 (4.00, 20.00)
Adjusts the cutoff frequency of a low pass filter used on the engine speed
sensing input (see Figure 3-3). 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.
As the filter frequency is reduced, steady state stability improves but transient
performance may worsen. As the filter frequency is increased, steady state
stability worsens but transient performance may improve.
If the calculated firing frequency is greater that 15.9 Hz, then disable
the filter by setting the filter cutoff frequency at or above 15.9 Hz.
16 BUMP ACT TRIG (T THEN F) dflt = FALSE (FALSE, TRUE)
Allows you to test your dynamics settings by temporarily applying a decreased
fuel demand transient to stimulate a control response. Both the magnitude (Act
Bump Level) and duration (Act Bump Duration) of the transient may be set. The
actuator bump must be enabled in the ACTUATOR BUMP SETUP menu. To
initiate an actuator bump, toggle Bump Act to TRUE then back to FALSE while
the engine is operating in a normal steady state loaded or unloaded condition.
K**Dynamics #2 5 Pt Gain**
The Dynamics 2 control parameters are adjusted the same as Dynamics 1
described above. These parameters are in control only when the CB Aux contact
input is closed, or if a discrete input is configured for Select 2
nd
Dynamics and
this input is closed.
K**Dynamics #2 5 Pt Gain** parameters 04 thru 19 have the same
effect on speed control response as J
** Dynamics #2 5 Pt Gain**
parameters 01 thru 16 described above.
01 ENABLE DYNAMICS 2 W/CB dflt = FALSE (FALSE, TRUE)
When TRUE, the second set of dynamics is enabled when the circuit breaker
auxiliary contact or Select 2
nd
Dynamics contact is closed. When this prompt is
FALSE, only Dynamics 1 with be used to set speed control response.