ComNav 1101 Autopilot
The Autopilot accepts the rudder limits but does not move the
rudder during the Rudder Drive Test.
1. Ensure that the hydraulic steering system has been bled
properly.
2. Turn the Autopilot on and place it into POWER STEER mode.
Remove the cover of the Distribution Box so that you can
observe the LEDs. The yellow LED labeled “SWI PWR” should
be lit. Press the PORT DODGE button. The red LED lamp
labeled “PORT” should come on. Similarly, press the
STARBOARD DODGE button, and the green “STBD” LED lamp
should come on. If any of the LED lamps fail to come on when
expected, the SPU might be defective.
3. Check for a possible short in the output cable to the rudder
drive.
4. For DC solenoid systems (refer to the Installation chapter,
“Drive Option A” wiring diagram)
a) If the common connection to these solenoids is wired
directly into a circuit breaker, ensure that the breaker
is turned on.
b) Ensure that all wire connections to the solenoids and
to the 1101 Distribution Box are secure.
5. For AC solenoid systems (refer to the Installation chapter,
“Drive Option B” wiring diagram)
a) Check all connections between the 1101 Distribution
Box and the CT4 Drive Box.
b) Check all connections between the CT4 Drive Box and
the AC solenoids.
c) Ensure that the AC supply that feeds the CT4 Drive
Box is turned on.
6. For Reversing Pumps and Rotary Drives (refer to the Installation
chapter, “Drive Option C”, “D”, “E” or “F” wiring diagrams)
a) Ensure that the circuit breaker for the Drive Box is
turned on.
b) Check all connections between the 1101 Distribution
Box and the Drive Box.
c) Check all connections between the Drive Box and the
Reversing Pump or Rotary Drive.
d) Most Drive Boxes are equipped with internal fuses for
circuit protection. If these fuses blow, be sure to
check all wiring before replacing them. Replace fuses
only with the same type and rating.
e) If you have a mechanical clutch for your Rotary Drive,
be sure to engage it before the Autopilot executes the
“Measuring rudder movement – please wait” step in
the Rudder Drive Test.
7. For Continuous Running Electric Pumps
a) Check to see if the pump is running when the Autopilot
is in POWER STEER, AUTOPILOT or NAV modes.
b) Confirm the correct wiring using the manual supplied
PROBLEM SOLVING 9 - 2
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