Manual 02879 723PLUS/Analog Load Sharing
Woodward 65
4. TORSNL FUEL LIMIT (%FD) is the percentage of Fuel Demand the
actuator output will be limited to when the torsional measurement level
exceeds the TORSNL LEVEL @LIMIT (%).
5. TORSNL LEVEL @LIMIT (%) is the torsional level at which the TORSNL
FUEL LIMIT is activated.
6. TORSNL LEVEL @CLEAR (%) is the torsional level at which the TORSNL
FUEL LIMIT is deactivated.
7. NOTCH FREQUENCY (HZ) is the center frequency of rejection, and the
units are defined in hertz. In tuning the notch filter, the resonant frequency
must be identified and entered. The allowed frequency range of the notch
filter is 0.5 to 16.0 Hz.
8. NOTCH Q FACTOR is the width about the NOTCH FREQUENCY that the
filter rejects, and is dimensionless. The Q factor has a tuning range of 0.707
to 25.0. At the minimum value 0.707, there is no attenuation of signal gain at
the resonant frequency, and the filter gain equals one. At the maximum
value 20.0, a maximum attenuation of signal gain occurs at the resonant
frequency, and the filter gain equals 0.035. In general, the filter gain at the
resonant frequency is 0.707/Q factor.
9. TORSIONAL LEVEL (%) displays the torsional level as a percentage of the
full scale torsional vibration.
10. TORSNL FILTR ACTIVE displays whether the torsional filter is enabled and
active (TRUE) or disabled (FALSE).
11. TORSIONAL LIMIT LVL (%FD) displays the torsional limit applied to the
speed control as a % fuel demand limit.
NOTE
The notch filter is enabled when CFIG OPTION menu items USE TORSION
FILTER and USE NOTCH FILTER are set to TRUE, and TORSIONAL FILTER
menu item ENABLE TORS FILTER is set to TRUE. Otherwise the notch filter
is disabled.
Fuel Limiters
Fuel limiters restrain the fuel demand from the control to the actuator.
1. START FUEL LIMIT (%FD) limits the percent fuel demand when the engine
is started. The limit is usually set at the fuel level required to start the
engine. The limiter is disabled when the engine speed exceeds 95% of
speed reference (see Figure 4-6).
The limiter begins out of the way at 100% with no speed. Upon speed clear,
START FUEL LIMIT immediately limits the fuel to the start fuel limit. The
limiter then ramps at START RAMP %/sec until the speed has reached
95% of reference and the Speed Control PID is in control for 1 second.
2. START RAMP (%FD/S) establishes the start limiter ramping rate at which
the fuel demand increases to assist starting in colder ambient conditions.
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