Systems Ltd
NT850 Main Steering System Configuration Type 4.

Type 4 - SOLAS compliant suitable for single rudder/dual pump systems using the NT851 STSS for Pump Selection, or, for Independent Rudder Systems using the NT851 STSS Rudder System Selection. Rudder Angle Indication (NT850 RAI), Analogue Heading Repeater (NT880 AHR) and Override facilities (NT850 OVSW) are included and the resultant system is suitable for vessels of all types (including high speed craft) to 3000GT (NT888G Autopilot) and above (NT999G Autopilot).

Rudder Angle Indicator Type NT850 RAI
NT888G Autopilot System Rudder Angle Indicators Rudder Angle Indicators NT850 Steering Mode Selector NT850 Non Follow Up NT850 Steering System Selector NT850 Override Switch NT850 Full Follow Up Wheel NT880 Analogue Heading Repeater
Heading Repeater Type NT880 AHR
Override Control Type NT850 OVSW
Autopilot Control Unit Type NT888G
FU Wheel Unit Type NT850 WFU
NFU Control Type NT850 NFU
Steering System Selector Type NT851 STSS
Steering Mode Selector Type NT850 STMS
(Dims 497 x 636 x 200 mm)
(Cut Out 448 x 588 mm)

Dual Independent Rudder Systems benefit from simple synchronisation of rudder positions (when required) via inclusion of the NT850 NFU and immediate Override control is available to the operator in any emergency situation via use of the NT850 OVSW. Steering Mode selection is via the NT850 STMS whilst Pump selection (single rudder) or Rudder System selection (dual rudders) is afforded by the NT851 STSS (as shown above) and together provide selection of the Rudder System to be used (No 1, No 2 or both) plus Pump Selection (single rudder system) to allocate/share duties/redundancy as required.

Operation is therefore straight forward with operating/control modes defined as follows:-
FU ....... Follow Up Wheel unit type NT850 WFU active.
NFU .... Non Follow Up control type NT850 NFU active.
Auto ... NT888G Autopilot steering active*.
* Vessels over 3000GT would use Navitron Autopilot type NT999G and larger control panel.
A comprehensive NT850 SOLAS compliant Dual Independent Rudder Main Steering Example.
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