B&G Network Autopilot - Manual (Page 17)

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KEY POINTS WHEN INSTALLING THE RRU
• General consideration must be given to the steering system and its
geometry before starting the RRU installation. Many factors must be
contemplated for a practical solution, the information given here is for
guidance only, although where a maximum or a minimum value is
given these must be adhered to.
• Mount the RRU on a flat surface next to the tiller arm or steering
quadrant, construct a small platform if necessary.
• Do not lengthen the drag-link arm as this can transmit excessive
vibration loads to RRU and will invalidate the warranty.
• The unit operating arm can be rotated through 360º, the mid-point of
the RRU travel is when the operating arm is opposite the cable entry
point.
• When the rudder is moved from hard-over port to hard-over starboard
the RRU arm should swing through a minimum of 90º, this will ensure
that there is sufficient voltage output to the autopilot. Measure the
voltage difference between the green and blue wires of the RRU,
there should be a minimum of 1 volt change from hard over to hard
over. N.B. If there is less than 1 Volt change the Pilot will not
commission.
• After installation check full movement of the steering system ensuring
that there is no fouling between the steering gear, RRU parts and
ram drive unit if fitted.
• Ensure that there is no backlash in the linkage between the RRU and
the steering gear, otherwise incorrect operation of the autopilot will
occur.