TESTING THE SYSTEM
1.
Check that the supply voltage is connected to the correct amplifier terminals. The circuit
board has built-in polarity protection to prevent circuit damage, but the system will not
initialize until polarity is correct.
2.
Centre the rudder and ensure that the rudder follow-up unit is mechanically centered. Centre
all FFU controllers.
3.
Turn on power to the Model
7173-KAS
Amplifier Unit.
4.
Turn on the hydraulic pumpset or, in the case of an engine driven pumpset, start the engine.
5.
The rudder should stay at midship and may hunt back and forth (see steps #9 and #10) at the
midship position. If the rudder moves to a hardover position, shut off power to the amplifier
and reverse the wires going to the solenoid or the black and white wires coming from the
feedback unit (see applicable drawing) on the Model
7173-KAS
circuit board. Re-apply
power to the Model
7173-KAS
Amplifier Unit.
6.
Move the FFU controller to the 20° port. The rudder should move in the port direction. If
the rudder moves to starboard, reverse the black and white wires coming from the controller.
7.
Repeat step #6 for any additional controllers wired via a station selector.
8.
Move the FFU controller to a hardover position and adjust the internal FFU controller trim
pot until the rudder stops just before the hardover position. Also, rudder limit adjustment
can be achieved by adjusting rudder limit trim pots on
7173-KAS
board or by adjusting the
stroke on the feedback unit.
NOTE
: You must not allow the cylinder to continually push
against the mechanical stops (hardover position).
9.
Move the FFU controller to the centre position and adjust the deadband adjustment trim pot
(R17 or R31) clockwise until the rudder begins to hunt back and forth (rudder may already
be doing this).
10.
Carefully adjust the R17 or R31 deadband control counterclockwise until the hunting effect
stops. This setting will be the maximum useable gain for your system. Check the
adjustment several times by moving the controller to various positions. If hunting starts, re-
adjust R17 or R31 counterclockwise to correct.
CAUTION
: In order to avoid overheating/damaging the solenoid coils or the
7173-KAS
amplifier, power to the amplifier should be disconnected if hydraulic power is not available.
