Woodward 723PLUS Technical Manual page 28

723PLUS Digital Marine Control
Analog Output #2, and #4
(Terminals 17/18, and 21/22)
These two analog outputs are configured specifically for this application. The
output current is configured for 4 to 20 mA on Analog Output #2, and for 4 to 20
mA on Analog Output #4. This current signal is supplied to terminals 17(+) and
18(–) for Analog Output #2, and terminals 21(+) and 22(–) for Analog Output #4.
Note that these terminals must be isolated from ground. Analog Output #2 is
configured for Engine Speed and Analog Output #4 is configured for Rack
Position.
To prevent possible damage to the control or poor control
performance resulting from ground loop problems, we recommend
using current-loop isolators if the 723PLUS control's analog inputs
and outputs must be connected to non-isolated devices. A number of
manufacturers offer 20 mA loop isolators.
Analog Output #1 is not used in this application.
Analog Output #2 is specially set at the factory for 0 to 20 mA, representing the
engine speed. Default range is 0 to 1200 rpm.
Analog Output #4 is factory set for 4 to 20 mA, representing the 0–100% Rack
Position signal.
Use shielded twisted-pair wires. For electrically isolated devices, such as 4 to 20
mA analog meters, the shield should be grounded at the control end of the cable.
For input to other devices, use the recommendation of the device manufacturer.
Analog Output #3 (Terminals 19/20)
The actuator wires connect to terminals 19(+) and 20(–).
Analog Output #3 is factory set for 0 to 200 mA and can only be selected as an
actuator command.
Use shielded twisted-pair wires with the shield connected to the chassis at the
control.
LON #1 and LON #2 (Terminals 23—28)
The 723PLUS control provides two separate LON communication channels for
communicating with Echelon networks. Use one of the cable types listed below to
make all LON wiring connections. There is no polarity associated with the
network wiring. Total network length must not exceed 500 meters (1640 ft).
Torque sharing is performed entirely with LON communication and negates the
need for any separate torque sharing wiring connections.
LON #1 terminals 23 and 24 connect to LON #1 on a mating 723PLUS Digital
Marine control to provide the data and signals needed for correct clutch control
and mechanical torque sharing in a two-engine marine propulsion system.
LON #2 terminals 26 and 27 connect to LON #2 on a mating 723PLUS Digital
Marine control to provide redundant data and signals needed for backup clutch
control and mechanical torque sharing in a two-engine marine propulsion system.
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Manual 26482
Woodward