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Robertson AP9 Mk3 Autopilot
Minimum Thrust & Thruster deadband
This example shows how the
control signal will appear for
a combination of deadband
and minimum thrust.
The control signal will stay at
zero until the heading error
exceeds 2 degrees. Than a
25% power signal will be
applied.
The
different
selected during sea trial.
Gyro Compass selection
The AP9 MK3 Control Unit must be set up for the correct type of
gyro. This means that selection of 1:1 synchro either from the gyro or
the autopilot and current phase and reference voltage.
This is done by means of two packages of DIP switches, 8 switches
each, located on the back of the Interface board (See Fig. 5-47.)
All switches are factory set to OFF-position. Carefully check whether an
Note !
eventual 1:1 synchro is excited from the gyro or not. SW1-7/8 must NOT be
ON if the gyro provides excitation, or damage of the gyro interface module
will occur.
If the synchro is "DEAD", switch on SW1-7/8. Appr. 15V, 400Hz
signal square wave signal will excite R1-R2 of the synchro.
5-58
final
values
of
parameters
Gyro Interface board, switches
+10V
(100%)
20%
the
are
Fig. 5-47
U
Min. Thrust 20%
Heading error
Deadband ±2°
-10V
20169223D
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