Woodward 2301E, Инструкция по установке и эксплуатации, Страница: 83 / 182

Manual 26641 2301E Digital Control
Woodward 73
B**ENG
—GEN CNTRL FUNCTIONS**
01 ENTER NUM OF GEAR TEETH
dflt = 60 (8, 500)
This is the number of teeth or holes of the gear or flywheel that the speed sensor
is on. If the gear is on the cam shaft or other drive not turning at the prime mover
speed, the number of teeth needs to be adjusted to compensate. EXAMPLE: If
the gear is rotating at one-half the engine speed enter one-half the number of
actual teeth.
The maximum input frequency that can be measured by the speed
sensing circuit is 25 000 Hz. Therefore to allow for transient
conditions, the (Number of Teeth x Rated rpm) / 60 should be less
than 19 000.
The number of gear teeth is used by the control to convert pulses
from the speed-sensing device to engine rpm. To prevent possible
serious injury from an overspeeding engine, make sure the control is
properly programmed to convert the gear-tooth count into engine
rpm. Improper conversion could cause engine overspeed.
02 SPD SENSE TYPE (1, 3, 4, 5) dflt = 1 (1, 3, 4, 5)
This input determines the speed calculation where:
1.
Speed Sensor Function 1 is used for medium and high speed engines. The
speed is sensed once every 1/16th of a full engine revolution and averaged
with the previous 15 samples. There are 16 speed samples in the average.
2. Speed Sensor Functions 2 is not used. Do not use this value!
3. Speed Sensor Function 3. The speed period is sampled once every
1/SAMPLES of a full engine revolution. The last SAMPLES are averaged to
determine the speed. For example, if SAMPLES = 10, then the speed period
is sampled every 1/10th of an engine revolution. The speed is the average
of the last 10 samples; therefore the speed is the average of the last 10
samples taken during the last engine revolution. The samples are adjusted
by entering the Number of Cylinders in the Configure menu.
4. Speed Sensor Function 4. This function is specifically designed to give
readings at low speeds without the delay associated with other types of
speed sensing blocks. The speed period is sampled on every gear tooth.
The speed is determined from the average of the last 2 gear tooth samples.
Note: Speed Sensor Type 4 should only be used in applications where
the gear tooth frequencies are below 1000 Hz. Higher frequencies may
cause control problems.
5. Speed Sensor Function 5 is specifically designed with an adaptive rotational
speed sensing filter. This filter will give stable speed sensor readings for:
o
Low and medium engine speeds. (<1600 MPU frequency)
o
Engine torsional frequencies caused by engine firing frequencies, or
various engine loads.
o
Noisy MPU signals caused by run-out in the gear, irregular shaped
gear teeth or irregular shaped holes in the flywheel.
Speed Function 5 is also used with the following menu items:
o
Configure Menu B**ENG
—GEN CNTRL FUNCTIONS** 03 ENTER
NUMB OF CYLINDERS.
o
Service Menu X**ADAPTIVE FILTER SET** 01 ADAPTIVE FILTER
ENABLE. (This value works well for most applications)
o
Service Menu X**ADAPTIVE FILTER SET** 02 ADAPTIVE FILTER
GAIN. (This value works well for most applications)