Jastram ENGINEERING SCA 300 - Figure 2 - Typical Travel Limits

Introduction
Page 6 of 31
Doc No.: MAN01502, 27-02-01 SCA 300 Manual
Figure 2 – Typical Travel Limits (Angles may vary)
SCA 300 Steering Control Amplifier
The SCA 300 is designed for use with DC powered hydraulic solenoid
valves.
The SCA is fully capable of either full follow-up or non follow-up operation.
Although Figure 1 shows the cabling layout for both, the non follow-up
components and cables can be considered as optional. All SCA’s are
equipped with a relay which, when turned on, disconnects the non follow-
up jog lever from the hydraulic solenoids and connects the SCA’s full
follow-up output.
During full follow-up steering, the SCA controls the 4-way directional
solenoid valve of the hydraulic power unit. The SCA does this by
comparing the rudder order signal from the full follow-up input device and
rudder angle signal from the rudder feedback unit. When these signals
are different, the SCA begins to apply current to the directional solenoid
valve, which turns the rudder to reduce the difference. The current
applied to the solenoid is proportional to the difference between the rudder
order and rudder angle signals. This results in the smooth acceleration
and deceleration of the rudder. The SCA continues to turn the rudder until