MCP - Inputs
Page 34 of 80
2.3.2 NFU Command Device
Description
This input is available for connection of a standard NFU jog lever type
input device containing port and starboard micro-switches. The micro-
switches are connected to provide time dependent, momentary, port and
starboard directional commands to the MCP. NFU input devices normally
only provide on-off signals to the directional valve. However, if a
proportional system is used the directional valve output can be setup to
include a predetermined amount of ramping which will allow for some
acceleration and deceleration of a proportional steering system.
This input is integral to the main DSC control system and is not a separate
backup system. A NFU device connected to this input can be arranged to
provide either discrete selection or seamless transferring capability
between NFU and Digital FFU steering input devices. This allows the
operator to control the rudder position using either device without having
to expressly select the mode using an input selector button.
See also: 1.3.6
Backup NFU System
2.3.5
Digital FFU Command Device
Specifications
Contact Format ............................ Momentary Action
Signal Format .............................. Sourcing 12 or 24V from MCP
Cable Break Protection ................ No
Connector ....................................3.81mm pitch pluggable screw terminals
Installation
If NFU steering is backwards reverse the port and starboard leads at the
NFU device.
Commissioning
In addition to assigning a mode button for this input there are a number of
options available to determine how this NFU device will function. These
options include seamless transfer with a digital helm, autopilot dodging
and rudder speed parameters. If a NFU device is connected to the
primary MCP then the system must be configured with the SCP 1 NFU
Mode set to ‘Connected to SCP 1’. These configuration settings are
Doc No.: MAN01504, 20-02-06 DSC 100 & MCP 100 Manual
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