Raymarine Autohelm 100, Install Manual

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78 TYPE 100/300 Operation and Installation Handbook
3.5 Operating sense
The operating sense of the autopilot can be checked as follows:
1. Push AUTO.
2. Press the +10 degree key. This should move the rudder a few
degrees to produce a turn to starboard. If the rudder moves
hardover to port, the motor connections at the course computer
should be reversed.
3.6 Rudder deadband
The factory preset rudder deadband level will provide stable rudder
positioning on most steering systems. On some steering systems, where
a rotary or hydraulic drive unit is sited a long way from the rudder, slight
instability may occur. This can be removed by increasing the 'rudder
damping' level in calibration. Any increase should be minimised as it will
reduce the autopilots course keeping accuracy.
3.7 Mechanical test (Linear, Rotary & Hydraulic Drives)
WARNING: When the steering system is being moved manually, or
under drive from the autopilot, do not touch any part of the system.
The forces exerted are considerable and could cause injury.
1. Push AUTO.
2. Press the +10 degree key to drive the rudder hardover onto the end
stops
Note: This may require increasing the rudder limit in the calibration mode.
3. Make sure the drive unit mounting shows no sign of movement.
4. For hydraulic systems, make sure there is no seepage of hydraulic
fluid and that the steering ram moves smoothly.
Caution: If the installation is a non Autohelm Constant Running
Pump, firstly check that the system includes a pressure relief valve.
Failure to do this could cause damage to the steering system.
5. Repeat driving the rudder hardover to the opposite end stop.
Current limit and cutout
When the rudder is driven onto the end stops the power to the drive will be
cut out after a few seconds - this is normal. Drive will only be restored if the
rudder moves away from the end stop or if drive is required in the opposite
direction.