SP-120 System with Rudder Feedback – No Drive Unit
The SP-120 autopilot control system comprises the following units:
- SP-120 display and control head
- SI-TEX 9 Axis rate compass
- Rudder Feedback Unit (SP-120R only)
In addition the SP-120 has to be connected to a drive unit which controls the rudder actuator system in order to complete the full autopilot system. The actuator system provides the physical movement to the rudder responding to the direction of control signals provided by the SP-120.
A rudder actuator system comprises one of the following:
- Hydraulic system with helm pump and ram
- Mechanical steering system
The autopilot should be connected to one of the following:
- Reversing motor/pump set connected into the existing hydraulic steering system
- Reversing mechanical drive unit connected to the existing steering mechanism
- Electronic Hydraulic Solenoid Valves
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