Woodward 723PLUS Technical Manual page 32

723PLUS Digital Marine Control Manual 26482
Torque Sensor Input
(Signal Input #1; Terminals 42/43)
Connect a torque sensor transmitter to Signal Input #1. The input signal must be
an isolated high-quality signal. By configuration, this input is used for torque
sharing and torque indication. Torque is displayed in software adjustable
engineering units on Watch Window, or on the optional Hand Held Programmer.
Use a shielded twisted-pair cable to connect a 4 to 20 mA current transmitter or a
1 to 5 Vdc voltage transmitter to terminals 42(+) and 43(–). When using a voltage
transmitter, remove the jumper between terminals 41 and 42. An input
impedance of 255 Ω is present when the jumper is installed. Without the jumper
installed, the input impedance will be greater than 10 M. This input is not
isolated from the other control inputs and outputs, and an isolation device must
be installed if the transmitter output is not isolated. An out-of-range or failure of
the input signal is detected for input values less than 2.0 mA (0.5 Vdc) or greater
than 22 mA (5.5 Vdc). The control defaults to a scaled actuator output for torque
sharing if this input fails. A detected input failure will remain until the failure is
repaired and an Alarm Reset is issued.
Remote Speed Reference Input
(Signal Input #2; Terminals 45/46)
Connect a remote speed reference transmitter to Signal Input #2. The input
signal must be an isolated high-quality signal. The remote speed reference is
displayed in rpm and Vdc on Watch Window, or on the optional Hand Held
Programmer.
Use a shielded twisted-pair cable to connect a 4 to 20 mA current transmitter or a
1 to 5 Vdc voltage transmitter to terminals 45(+) and 46(–). When using a voltage
transmitter, remove the jumper between terminals 44 and 45. An input
impedance of 255 Ω is present when the jumper is installed. Without the jumper
installed, the input impedance will be greater than 10 M Ω This input is not
isolated from the other control inputs and outputs, and an isolation device must
be installed if the transmitter output is not isolated. An out of range or failure of
the input signal is detected for input values less than 2.0 mA (0.5 Vdc) or greater
than 22 mA (5.5 Vdc). The control defaults, by configuration, to a 'Lock-in-Last'
speed reference. A detected failure will remain until the failure is repaired and an
Alarm Reset is issued.
Fuel Rack Position Input
(Signal Input #3; Terminals 48/49)
Connect the fuel rack position transmitter to Signal Input #3. The input signal
must be an isolated high-quality signal. The fuel rack position input is a signal
from a transducer, usually an LVDT or RVDT, that allows the 723PLUS control to
accurately measure the amount of fuel given to the engine. The 1–5 Vdc input
signal is scaled for 0–100% fuel rack position.
An out of range or failure of the input signal is detected for input values less than
2.0 mA (0.5 Vdc) or greater than 22 mA (5.5 Vdc).This signal is not being used
by the control logic and is only passed from this input to Analog Output #3.
22 Woodward