Raymarine p70 Installation And Operation Instructions Manual

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Raymarine p70 Installation And Operation Instructions Manual Manual pdf 42 page image

7.8 Adjusting the hard-over timeOn vessels without a rudder reference transducer, it is importantto set a Hard Over Time.Before attempting to follow this procedure ensure you haveread and understood the Rudder Check warning provided inthis document.To estimate your hard over time follow the steps below:1. On SmartPilot and SPX systems, adjust your Rudder Gainsetting to the maximum value, making a note of the originalvalue. The Rudder Gain setting can be accessed from theDrive 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 theengine should be running when turning the rudder.)3. Engage Auto mode.4. Press the +10 and +1 buttons at the same time (p70) oruse the Rotary (p70R) to alter your locked heading by 90degrees, use a stop watch to time the movement of therudder / engine.5. Estimate how long it would take to move the rudder from fullport to full starboard. This estimate is your Hard Over Time.6. Enter this estimate as your Hard Over Time. The Hard Overtime 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 Gainback to its original value.8. After setting your Hard Over Time, observe your autopilot’sbehavior and if required, make small adjustments to the HardOver Time value until a satisfactory result it achieved.Warning: Rudder checkIf no rudder reference has been fitted you MUSTensure that adequate provision is made to preventthe steering mechanism from impacting the endstops.7.9 Compass linearizationWith Evolution autopilot systems, when the EV unit is firstinstalled and powered-up, its internal compass needs tocompensate for local magnetic variations and the earth’smagnetic field. This is achieved using an automatic processknown as linearization, which forms an important part of theautopilot installation, commissioning and set-up process.LinearizationIn Evolution systems, the linearization process is performedautomatically by the EV unit as a background task when thevessel's speed is between 3 and 15 knots, no user interventionis required however at least a 270 degree turn is required. Theprocess will occur during your first voyage with the autopilotsystem, and will typically take no more than 30 minutes, butthis does vary according to the characteristics of the vessel,the installation environment of the EV unit, and the levels ofmagnetic interference at the time of conducting the process.Sources of significant magnetic interference may increase thetime required to complete the linearization process. Examplesof such sources include:• Marine pontoons.• Metal-hulled vessels.• Undersea cables.Note: You can speed-up the linearization process bycompleting a 360 degree turn (at a speed of 3 – 15 knots).You can also restart the linearization process at any time byselecting the Restart Compass menu item.Use the compass deviation indicatorThe use of the compass deviation indicator on the pilot controlhead may be useful in this process, particularly if the EV unit hasbeen installed in a location on the vessel where the levels ofmagnetic interference are too high for the EV unit to compensateappropriately. If this is the case, the deviation display will indicatea value of 25 degrees or higher. In this scenario, Raymarinehighly recommends that the EV unit is moved and re-installed ina location which is subject to less magnetic interference. If “- -”is displayed as the Deviation value, it means that linearizationhas not been successfully completed yet.Check the compass heading dataAs part of the autopilot system commissioning process,Raymarine recommends that you check the compass headingvalue displayed on your autopilot control head or multifunctiondisplay, against a good known heading source on variousheadings. This will help you to determine when the EV unit hascompleted its linearization process.Note: Once the linearization process has completed, it ispossible that the heading value may have a slight offset of 2 to3 degrees. This is common where installation space is limited,and the EV unit cannot be properly aligned to the vessel'slongitudinal axis. In this case, it is possible to manually adjustthe compass offset value using the pilot control head ormultifunction display, and fine-tune the heading to an accuratevalue.Note: Do NOT rely on the heading accuracy until you aresatisfied that compass linearization and alignment is complete.System monitoring and adaptationTo ensure optimum performance, after the initial linearizationprocess is complete the EV continues to monitor and adapt thecompass linearization to suit current conditions.If the conditions for linearization are less than ideal, theautomatic linearization process temporarily pauses untilconditions improve again. The following conditions can causethe 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.42 p70 / p70R