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Alarm/Warning
Drive inhibit
Drive not available
Drive overload
Possible cause
Motor or solenoid drive electronics
critically overloaded.
No drive response when requested
from autopilot on Handshake port on
SD80/AD80 board.
Reversible motor: motor stalls or is
overloaded.
Solenoids: shortage to ground or
cabling damage
Recommended action
• Check connectors and cables
• Check that the rudder angle measurement and the actual
physical rudder position corresponds
• Try to hand steer the rudder and verify that the rudder can
be moved freely
• Check that steering gear/thruster is set for autopilot
control
• Check cabling to Handshake port on SD80/AD80
• Make sure Handshake port on SD80/AD80 is configured
for HS fixed/HS pulse
• Check for possible mechanical blocking of rudder
• If heavy sea at high rudder angle, try to reduce boat speed
or rudder angle by steering at another heading
• Make sure there is no shortage to ground or cabling
damage
• Disconnect cable from autopilot computer to motor, and
make sure there is no alarm when trying to run in NFU
mode
• Check that the drive unit is appropriately dimensioned for
the boat and rudder size
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