Woodward 723PLUS, Original Instructions Manual

Page: 10 / 118

723PLUS/Single Engine Marine Propulsion Manual 02880
2 Woodward
Figure 1-1. Flexible Coupled Propeller
The 723PLUS control (Figure 1-2) consists of a single printed circuit board in a
sheet-metal chassis. Connections are via three terminal strips and three 9-pin
subminiature D connectors.
The control system typically includes the following components:

a 723PLUS Digital Speed Control

one actuator to position the fuel metering device

an external power source

one or two speed-sensing devices

eight optional switch contacts to manage control functions

an optional lube oil pressure transducer

an optional water pressure transducer

an optional fuel limiting air manifold pressure transducer

three optional analog readout devices for display

two optional relay-driven alarms
Control Options
This manual describes the designed application of the 723PLUS marine control
system, with low voltage power supply and torsional filtering.
Each 723PLUS control requires 40 W of power. A nominal current in-rush of 7 A
is possible. Acceptable input voltage range is 18 to 40 Vdc.
Discrete input voltages provide on/off command signals such as Raise Speed
and Lower Speed to the electronic control. Each discrete input requires 10 mA at
24 Vdc nominal voltage rating. The low voltage power supply may be used to
power these command signals (see Figure 1-7 for vessel wiring.)
Torsional filtering is provided on the 723PLUS control model described in this
manual. This filtering is specially designed to minimize the effects of flexible
coupling torsionals. This control provides exceptionally smooth steady-state
control which allows the control dynamics to be matched to the engine rather
than detuned to compensate for coupling torsionals. Removing the torsional
effects of the flexible coupling often provides a much longer life to the coupling.
This model can alarm and limit the fuel demand if unacceptably high torsional
levels occur.