Raymarine P70, Installation And Operation Instructions Manual

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7.8 Adjusting the hard-over time
On vessels without a rudder reference transducer, it is important
to set a Hard Over Time.
Before attempting to follow this procedure ensure you have
read and understood the Rudder Check warning provided in
this document.
To estimate your hard over time follow the steps below:
1. On SmartPilot and SPX systems, adjust your Rudder Gain
setting to the maximum value, making a note of the original
value. The Rudder Gain setting can be accessed from the
Drive Setting menu:
Menu > Set-up > Autopilot Calibration
> Drive Settings > Rudder Gain .
2. With the autopilot in Standby , manually turn the rudder /
engine full to port. (For vessels with power steering the
engine should be running when turning the rudder.)
3. Engage Auto mode.
4. Press the +10 and +1 buttons at the same time (p70) or
use the Rotary (p70R) to alter your locked heading by 90
degrees, use a stop watch to time the movement of the
rudder / engine.
5. Estimate how long it would take to move the rudder from full
port to full starboard. This estimate is your Hard Over Time .
6. Enter this estimate as your Hard Over Time. The Hard Over
time setting can be accessed from the Drive Settings menu:
Menu > Set-up > Autopilot Calibration > Drive Settings >
Hard Over Time
.
7. On SmartPilot and SPX systems change your Rudder Gain
back to its original value.
8. After setting your Hard Over Time, observe your autopilot’s
behavior and if required, make small adjustments to the Hard
Over Time value until a satisfactory result it achieved.
Warning: Rudder check
If no rudder reference has been fitted you MUST
ensure that adequate provision is made to prevent
the steering mechanism from impacting the end
stops.
7.9 Compass linearization
With Evolution autopilot systems, when the EV unit is first
installed and powered-up, its internal compass needs to
compensate for local magnetic variations and the earth’s
magnetic field. This is achieved using an automatic process
known as linearization, which forms an important part of the
autopilot installation, commissioning and set-up process.
Linearization
In Evolution systems, the linearization process is performed
automatically by the EV unit as a background task when the
vessel's speed is between 3 and 15 knots, no user intervention
is required however at least a 270 degree turn is required. The
process will occur during your first voyage with the autopilot
system, and will typically take no more than 30 minutes, but
this does vary according to the characteristics of the vessel,
the installation environment of the EV unit, and the levels of
magnetic interference at the time of conducting the process.
Sources of significant magnetic interference may increase the
time required to complete the linearization process. Examples
of such sources include:
• Marine pontoons.
• Metal-hulled vessels.
• Undersea cables.
Note: You can speed-up the linearization process by
completing a 360 degree turn (at a speed of 3 – 15 knots).
You can also restart the linearization process at any time by
selecting the
Restart Compass menu item.
Use the compass deviation indicator
The use of the compass deviation indicator on the pilot control
head may be useful in this process, particularly if the EV unit has
been installed in a location on the vessel where the levels of
magnetic interference are too high for the EV unit to compensate
appropriately. If this is the case, the deviation display will indicate
a value of 25 degrees or higher. In this scenario, Raymarine
highly recommends that the EV unit is moved and re-installed in
a location which is subject to less magnetic interference. If “- -”
is displayed as the Deviation value, it means that linearization
has not been successfully completed yet.
Check the compass heading data
As part of the autopilot system commissioning process,
Raymarine recommends that you check the compass heading
value displayed on your autopilot control head or multifunction
display, against a good known heading source on various
headings. This will help you to determine when the EV unit has
completed its linearization process.
Note: Once the linearization process has completed, it is
possible that the heading value may have a slight offset of 2 to
3 degrees. This is common where installation space is limited,
and the EV unit cannot be properly aligned to the vessel's
longitudinal axis. In this case, it is possible to manually adjust
the compass offset value using the pilot control head or
multifunction display, and fine-tune the heading to an accurate
value.
Note: Do NOT rely on the heading accuracy until you are
satisfied that compass linearization and alignment is complete.
System monitoring and adaptation
To ensure optimum performance, after the initial linearization
process is complete the EV continues to monitor and adapt the
compass linearization to suit current conditions.
If the conditions for linearization are less than ideal, the
automatic linearization process temporarily pauses until
conditions improve again. The following conditions can cause
the linearization process to temporarily pause:
• Boat speed is less than 3 knots.
• Boat speed is greater than 15 knots.
• Rate-of-turn is too slow.
• Significant external magnetic interference is present.
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p70 / p70R