Instruction Manual
20220562E 3
1 RI9 RUDDER ANGLE INDICATOR
1.1 General
The RI9 is manufactured in non-corrosive aluminum with a non-
reflective black finish.
It is designed to operate from both voltage and current signals. The RI9
can also operate from the earlier Robertson "Standard" rudder feedback
units.
The indicator is made in standard modular size (144x144 mm) to match
the standard of the Simrad autopilots.
A separate PCB is mounted inside the indicator to convert the input
signals for the indicator instrument. To select either voltage or current
operation, a “jumper” is plugged in the respective position. For voltage
operation a jumper is available for inverting the feedback signal.
The instrument gives a continuous reading of the rudder angle up to 45
degrees on either side of the midship’s position. (Other angles as
optional). Both deflection and offset are adjustable on the PCB. Internal
illumination can be adjusted by the dimmer control on the front.
The water tight construction allows bulkhead or desk mounting in
exposed locations, such as bridge wings as well as wheelhouse and
engine room.
RI9 substitutes the Robertson RI40 and RI45 rudder angle indicators.
1.2 Technical specifications
Dimensions:.............................................See Fig. 1-1
Voltage supply:........................................12/24V DC +/-20%
Current consumption:..............................100mA
Input signal:.............................................Voltage (0-18V) or
current (0.1 - 1.1mA)
Reverse meter deflection:........................On voltage input signal
Operating temperature:............................–10°C to +55°C
Protection:................................................IP56
Safe distance to magnetic compass:........2.6m (9 ft)
Rudder Feedback Units:..........................RF14XU, RF14XI,
RF45/RF45X, RF100, RF140,
“Mini” and “Standard” Rudder
Potentiometer.
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