Woodward 723PLUS Technical Manual page 31

Manual 26482
(Input E; Terminal 33)
The input switch or relay contact is not used in this application.
Clutch Request (Input F; Terminal 34)
The input switch or relay contact used to activate the clutching sequence
connects to terminal 34 (Discrete Input F). This discrete input changes the
control operation by initiating an automatic clutch closing sequence or, when
already clutched, an unloading and de-clutching sequence. 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 Clutch Request action differs
for these two cases:
When the switch or relay contact is closed (discrete input in the "TRUE" state),
and the other engine IS NOT clutched, the speed reference is ramped to Idle.
After an adjustable dwell time at idle, the clutch permissive Relay #3 output
contact (terminals 7 and 8) closes. The clutch permissive contact will re-open if
the Clutch Engaged input switch or relay contact (Discrete Input D, Terminal 32)
fails to close within the adjustable (1-120 seconds) 05 CLUTCH IN TIME in the
P**LOAD CONTROL** menu.
When the switch or relay contact is closed (discrete input in the "TRUE" state),
and the other engine IS clutched, the speed reference is ramped to match (sync)
the clutched engines speed. After an adjustable dwell time at synchronous
speed, the clutch permissive Relay #3 output contact (terminals 7 and 8) closes.
The clutch permissive contact will re-open if the Clutch Engaged input switch or
relay contact (Discrete Input D, Terminal 32) fails to close within the adjustable
(1-120 seconds) 05 CLUTCH IN TIME. Once the clutch has closed, the engine
soft loads until the load on both engines are matched where the control
automatically switches into isochronous torque sharing to maintain equal torque
on both engines. The dwell time, synchronous speed window and soft loading
time, are set in Service mode, under the P**LOAD CONTROL** header, at
prompts 05 CLUTCH SYNC TIME, 06 CLUTCH SPEED WINDOW and 03 LOAD
RATE.
Actuator Mode Switch (Input G; Terminal 35)
This contact input is an indication from the actuator that it is running on the
mechanical ballhead governor. This optional input is used for fault detection
(723PLUS not in control) and can only be used with appropriate reverse-acting
actuators.
Alarm Reset (Input H; Terminal 36)
The input switch or relay contact used to activate the Alarm Reset command
connects to terminal 36 (Discrete Input H). This discrete input issues a reset
command to all parameters, which can latch into an alarm state. When the
external switch or relay contact is closed (discrete input in the "TRUE" state), the
reset condition is applied for a short time even if the external contact remains
closed. With the contact open (discrete input in the "FALSE" state), the control
will again be ready to respond to the external contact closing. The Alarm Reset
command works in parallel with the software switch from Watch Window or the
Hand Held Programmer.
Woodward
723PLUS Digital Marine Control
21