Navitron NT888G MK2, Руководство по эксплуатации

Страница: 66 / 77

NT888G MK2 AUTOPILOT OPERATING MANUAL
The Control Unit REMOTE Key.
It must be noted that only the designated Master Control Unit is capable of
independent operation since it does not require “permission” from any other Autopilot
system component to become active.
The Master station is also the only station that can
grant “permission” to any other Control Unit(s) –
(2
nd
stations) – which are only enabled when the
Master station “ REMOTE ” key is activated (corner
LED of keypad illuminated).
The Master Control Unit will immediately disable any other Control Unit(s) if the
Master station
REMOTE key is deactivated (corner keypad LED off).
In this way, the Master station has unconditional control of the Autopilot system.
2.41 NT920 NFU Power Steering – Refer to Section 1.21.
2.42 NT990 FU Power Steering – Refer to Section 1.22.
2.43 Special Latched and Non Latched Power Steer Controls.
In addition to standard Navitron Follow Up (NT990 FU) and Non Follow Up (NT920
NFU) Power Steer options, the Autopilot will accept proprietary unit power steer
inputs via a dedicated opto isolated input port for special uses.
Power Steer inputs to this port can provide one of three installation selectable working
modes programmed via the Autopilot
SET UP Menu.
2.43 (i) Normal proprietary Follow Up Power Steer.
Typically, a proprietary unit of this type will be fitted with a lever operated linear
potentiometer and the angle of rudder applied will be directly related to the angle
through which the lever is moved – often against a graduated scale.
When the Follow Up lever is central, the rudder will be at midships and, if the lever is
moved and left at mid scale, the rudder will be positioned and will remain at the mid
scale value accordingly.
This is conventional Follow Up Power Steer operation and can be selected via the
Autopilot
SET UP Menu (Parameter No.75 & 78 set to NORM ).
Application notes in Section TM3 of the Installation and Technical Manual.
2.43 (ii) Non Latched Jog Lever (Non Follow Up) Override Control.
When the Autopilot is engaged (ON) and steering the required Set Course, it may on
occasions be required to override this Set Course temporarily to avoid potential
hazards/optimise leeway etc. (
REMOTE OVERRIDE Mode).
This can be done by connection of a proprietary “sprung to centre” jog lever which in
its central position demands no rudder movement allowing the Autopilot full control of
the rudder for steering purposes.