7
1.4.6 Linear Drive
A hydraulic linear drive is used to drive the tiller arm or quadrant of mechanical steering
systems. The linear drive is driven by a pumpset. The linear drive provides a cleaner
installation, being entirely below deck, and delivers more torque to the rudder than wheel
driven units. In case the mechanical steering should fail, the linear drive will provide a
back-up hydraulic steering.
1.4.7 Solenoid Valve Drive
On larger boats the main hydraulic steering may be fitted with solenoid valve controlled
power steering. In this case the Autopilot does not need to be supplied with a pumpset
since the Nexus Servo Unit output can be reconfigured with its board mounted DIP switch
to provide drive for steering solenoids or relays having coil voltages of 12 or 24 VDC.
1.5 Registering this product
Please take time to fill in the warranty cards and return them to your national distributor.
By returning the warranty card, it will assist your expert distributor to give you prompt
attention. Keep your proof of purchase. Also, your details are added to our customer
database so that you automatically receive new product catalogues when they are
released.
1.6 About this manual
• Each time a push-button is referred to in this manual, the push-button name will appear
in bold and CAPITAL letters, e.g. MODE.
• Unless otherwise stated, the push-button presses are momentary.
• Each time a function is mentioned in the text, it will be in brackets and in the same
format, where possible, as displayed, e.g. [HDG] for HeaDinG.
• With the word navigator we mean a GPS, Loran or Decca instrument.
• Which instrument is navigating? By the term navigating, we mean the active instrument
in which the waypoint memory is used for navigation to calculate the navigation data,
i.e. BTW, DTW etc. There can only be one instrument on the Nexus Network which is
keeping the waypoints in memory, but the waypoints can be reached from all
instruments.
Note! We have put in a lot of effort, in order to make this manual correct and complete.
However, since we have a policy of continuous improvement, some information may differ
from the product functions. If you need further information, do not hesitate to contact your
national distributor.
1 AUTOPILOT COMPONENTSINTRODUCTION
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