Woodward 2301D, Инструкция по установке и эксплуатации, Страница: 73 / 130

Manual 26247 2301D/2301D-EC Digital Control
Woodward 65
4. Preset rated speed.
When using a signal generator to verify the proper configuration setting: set
the signal generator for the frequency of the speed sensor at rated speed,
and connect it to terminals 25 and 26. (The rated speed frequency in Hz
equals the rated prime mover speed in rpm times the number of teeth on the
speed sensing gear divided by 60.) Put the Close For Rated contact in the
rated (closed) position. Connect a dc analog voltmeter to terminals 13(+)
and 14(–) to read actuator voltage. If the actuator voltage is at minimum
(minimum will be approximately 0 volts), slowly decrease the input
frequency (increase for reverse acting controls) until the voltage just begins
to move to maximum. If the actuator voltage is at maximum, slowly increase
the input frequency (decrease for reverse-acting controls) until the voltage
just begins to move to minimum. Continue to very slowly adjust the input
frequency in the appropriate direction, trying to stop the actuator voltage
between the minimum and maximum voltages. Because it is not possible to
stop the motion, cease adjusting when the voltage changes slowly. The
RATED SPEED configuration has been verified. No further adjustment when
the engine is running will be necessary.
5. Check the speed sensor.
Minimum voltage required from the speed sensor to operate the electronic
control is 1.0 Vrms, measured at cranking speed or the lowest controlling
speed. For this test, measure the voltage while cranking, with the speed
sensor connected to the control. Before cranking, be sure to prevent the
prime mover from starting. The frequency required to clear the Loss of
Speed shutdown is entered as a percent of rated speed during
configuration. For example, at 5% of 1800 rpm rated speed, the failed speed
sensing circuit is cleared at 90 rpm.
Be prepared to make an emergency shutdown when starting the
engine, turbine, or other type of prime mover, to protect against
runaway or overspeed with possible personal injury, loss of life, or
property damage.
6. Start the prime mover.
Adjust for Stable Operation
If prime mover operation is stable, go to the “Speed Setting Adjustment”
procedure. If the prime mover is hunting at a rapid rate, slowly decrease the
GAIN until performance is stable. If the prime mover is hunting at a slow rate,
increase the RESET until the prime mover stabilizes. If increasing the RESET
does not stabilize the prime mover, it also may be necessary to either:

Slowly decrease the GAIN or

Slowly decrease the GAIN and increase the ACTUATOR COMPENSATION.
For the PID adjustment see Chapter 5, Alternative Dynamic Adjustments.
Speed Setting Adjustment
With the prime mover operating stably, adjust the RATED SPEED to bring the
prime mover to the desired operating speed.