Woodward 723PLUS Technical Manual page 27

Manual 26482
The relay contact on terminals 5/6 for Relay Output #2 is used when internal
major alarm conditions are to be used by other devices in the application. No
connection is required if the major alarm function is not used in the application.
The relay changes state if any configured major alarm condition has occurred
without being cleared or reset. The state of the contact can be configured as
either close on major alarm or open on major alarm. If power to the control is lost,
the contact will open.
The relay contact on terminals 7/8 for Relay Output #3 provides the Clutch
Permissive. The relay contact changes state based on control configuration and
parameters as described next.
If CONFIG OPTION prompt MANUAL CLUTCH LOGIC is set TRUE, the relay
contact is held open and a clutch permissive is not issued. Clutch closure with
this configuration is solely a Manual operation.
If CONFIG OPTION prompt MANUAL CLUTCH LOGIC is set FALSE, the relay
contact closes automatically when permissive conditions for clutch closure are
met. There are two cases to consider for automatic clutching. One is that no units
are clutched in, and the second is that one unit is already clutched in. The
permissive conditions differ for these two cases. When the following permissive
conditions for each case are met, the Clutch Permissive relay contact closes:
No Units are Clutched In (The first unit clutched is the Master)

Engine running (speed > 5% rated)

Run/Stop in 'Run' position (Discrete Input A)

Clutch Request closed (Discrete Input G)

If engine speed is not at Idle, ramp to Idle

Engine speed at Idle for the CLUTCH SYNC TIME
Other Unit Already Clutched In (This second unit clutched is the Slave)

Engine running (speed > 5% rated)

Run/Stop in 'Run' position (Discrete Input A)

Clutch Request closed (Discrete Input G)

If engine speed is not at Master engine speed, ramp to Master speed.

Engine speed matches the Master engine speed within the CLUTCH
SPEED WINDOW setting for the CLUTCH SYNC TIME.
The Clutch Permissive relay contact will open if a Clutch Engaged contact
closure is not received (at discrete input H) within the CLUTCH IN TIME. The
clutch request must be toggled to re-close the Clutch Permissive relay contact.
Speed Signal Inputs (Terminals 11/12 and 13/14)
Connect a magnetic pick-up (MPU) or proximity switch to terminals 11 and 12.
You may connect a second MPU/proximity switch to terminals 13 and 14. The
second speed-sensing device may be used for redundancy. The second device
will provide backup speed sensing in the event of a single speed sensor device
failure. If two speed sensor devices are used, they must both sense the exact
same speed of rotation. The usual location for both devices is on the upper half
of the flywheel housing.
Woodward
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.
723PLUS Digital Marine Control
17