Woodward 2301E, Инструкция по установке и эксплуатации, Страница: 26 / 182

2301E Digital Control Manual 26641
16 Woodward
Failed Speed Override
A contact to override the failed speed signal circuit can be installed in series with
the discrete input configured for the Failed Speed Override and the dc power to
the discrete inputs. When the contact is open, the control operates normally,
turning the control output off in the event of a loss of speed signal. Closing the
contact overrides the failed speed signal circuit as may be required for start-up.
Prior to start-up of the prime mover, the speed signal is non-existent. On prime
movers with cranking motors, the cranking speed is usually sufficient to provide a
speed signal, so an override contact is not needed for starting. On some
systems, the Failed Speed Signal Override contact must be closed in order to
allow the actuator to open and provide fuel for starting. If a failed speed signal
override contact is used, it should be of the momentary type to ensure that the
failed speed sensor shutdown circuit is enabled after start-up. The logic function
of this input can be modified to be normally open or normally closed.
Reset
One of the three configurable discrete contacts can be configured as a reset. The
reset can be used to reset alarms or shutdowns.
The res
et is the same as the “software reset” Reset shutdown in the Service
menu C**SHUTDOWNS** or Reset alarms in menu D**ALARMS**.
An automatic reset is given to clear any alarm or shutdown when the engine
clears the MPU Failsafe speed, typically 5% of rated speed. If the alarm or
shutdown still exists, the engine will shut down again.
After a shutdown has occurred (for example an overspeed or an MPU failure)
you can only reset the control when the engine speed is zero.
The logic function of this input can be modified to be normally open or normally
closed.
Select 2
nd
Dynamics
One of the three configurable discrete contacts can be configured as Select 2
nd
dynamics. In menu I**DYNAMICS #2** the parameter enable dynamics 2 w/CB
should be configured at TRUE to enable the 2
nd dynamics. This contact can be
connected to a clutch-feedback or when a different operating mode of the engine
is used to activate the 2
nd
dynamics, when a separate set of PID settings are
necessary. The logic function of this input can be modified to be normally open or
normally closed.
Shutdown External
One of the three configurable discrete contacts can be configured as External
shutdown. When the contact is open, the control operates normally, Closing the
contact will STOP the engine. This contact can be used as a Emergency
shutdown. When the contact is opened again a reset should be given before the
engine can be started again. The reset can be given by a reset input if
configured, or the Run/Stop Fuel contact 34 should be toggled. The logic function
of this input can be modified to be normally open or normally closed.