B&G Network Pilot (ACP) - Manual (Page 104)

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to the rudder reference should be 4.5 to 5.0 volts (between Red-
Blue). With someone moving the helm, the signal measured
between (Blue-Green) should change smoothly. If the signal is
incorrect, suspect a faulty rudder reference unit. Note, the difference
between the signal voltages measured at the two end stops must be
at least 1.0 volts.(e.g. Blue -Green Voltage minus Red -Green
voltage must be greater than 1 Volt).
3. Set Pilot Display to show digital rudder angle in degrees. Move helm
to port and starboard end stops, check that the indicated rudder
angle is 40 degrees (+/- 2). If not, check the rudder reference
installation to determine and rectify the reason for the end stop
position changing and then re-enter the end stop commissioning
values.
4. Move helm slowly from end stop to end stop. Check that indicated
rudder angle counts from 40 deg. one side to 40 deg the other side
without "missing" a count.
5. If the fault is always at the same rudder angle, suspect a faulty
rudder reference unit.
6. If the fault is at different rudder angles suspect a fault in the wiring,
the connections to the Pilot computer, or the Pilot computer
electronics.
RUD DRV RUDDER DRIVE
Fault description:
The Pilot attempted to move the rudder, but did not sense any change
in rudder position.
Or
When the Pilot attempted to move the rudder, it moved in the wrong
direction.