Simrad NSS12 Installation Manual page 45

Rudder drive setup
The rudder drive setup controls how the autopilot computer controls
the steering system.
Drive voltage
Voltage specifi ed for your drive unit.
The Drive unit voltage setting does not apply when the system
operates solenoids on a continuous running pump/steering gear.
Hence, the output voltage to the solenoids will be the same as the
input voltage.
Refer to the drive unit table in the AC12/AC42 Installation manual or to your drive unit docu-
mentation for information
!
Warning: Selection of improper voltage level for your drive unit may damage both the
drive unit and the AC12/42 even if the protection circuits are activated.
Drive engage
Clutch This is the default setting and it allows you to steer the boat with the helm or
wheel when in STBY mode (FU and NFU modes) as well as in all auto steering
modes
Auto This option is typically used to switch between two rudder speeds on a continu-
ous running pump, used when diff erent rudder speeds are required for auto-
matic and Follow-up/Non-Follow-up steering
Motor output
Shows the amount of power needed to achieve the correct rudder speed. The reading is
obtained from the Rudder test.
The automatically set value may be increased or decreased.
Rudder deadband
This parameter is used to prevent the rudder from hunting. The reading is obtained from the
Rudder test which optimizes the deadband to the speed of the boat and the pressure on the
rudder.
If the auto-setting does not perform properly due to high inertia from the wheel or a loose
steering gear, it can be adjusted manually. Find the lowest possible value that will prevent the
rudder from continuous hunting. A wide deadband will cause inaccurate steering.
 Note:
The rudder deadband setting is not available when the autopilot is confi gured for
Virtual Rudder Feedback.
Seatrials
A seatrial can only be performed if the dockside settings are completed and confi rmed.
The seatrial must always be performed in open waters at a safe distance from other traffi c.
 Note:
You can switch the autopilot to standby mode and take manual control of the boat at
any time during the seatrial by pressing the
The following seatrial calibration should be done:
• Compass calibration; used to automatically compensate for on-board magnetic interference
• Compass off set adjustment, used to compensate for a fi xed off set in the fi nal heading
readout
• Wind calibration to compensate for a fi xed mechanical off set of the Wind vane
• Boat speed calibration
• Transition HI/LO speed setting (the speed at which you want to change the set of steering
parameters)
• Automatic tuning of the steering parameters
• Setting the seastate fi ler
• Saiboat setup
s s
STBY/AUTO
key.
Autopilot | NSS Installation Manual
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