Maretron M001101 - Manual (Page 13)

® ®
Revision 1.0 Page 9
5 Troubleshooting
If you notice unexpected operation of the Maretron RAA100, follow the troubleshooting
procedures in this section to remedy simple problems.
Symptom Troubleshooting Procedure
No rudder angle
output 1. If operating in the NMEA 2000
®
Mode, check the connections to the
NMEA 2000
®
interface (see Section 2.3.2) and/or the connection to the
resistive rudder angle sender (see Section 2.3.1.2) and tighten if
necessary.
2. If operating in the NMEA 2000
®
/ Analog Gauge Mode, then check the
connections to the NMEA 2000
®
interface (see Section 2.3.2) and/or
the connection to the analog gauge (see Section 2.3.1.1) and tighten if
necessary.
3. Ensure that power is supplied to the NMEA 2000
®
network. Proper
network power can be checked by measuring the voltage at an open
tee between NET-S and NET-C. The voltage should be between 9 and
16 volts.
4. Ensure that both trunk line terminators are in place. Proper network
termination can be checked by removing network power and
measuring the resistance at an open tee between NET-L and NET-H
signals. The resistance should read approximately 60 ohms (two 120
ohm terminators in parallel equals 60 ohms).
Inaccurate
rudder angle
output 1. Remember, the accuracy of most analog gauges/resistive rudder
angle senders is at best plus or minus 10%. The inaccuracies are due
to both the analog gauge and the resistive rudder angle senders.
Although the RAA100 is a precision instrument, it is only as good as
the resistive sender, which may not be as accurate as you like. Avoid
low cost resistive rudder angle senders if you desire good accuracy.
2. If using a standard resistive rudder angle sender (American standard
240-30 ohm, European standard 10-180 ohms), make sure you have
correctly configured the RAA100 for the appropriate standard (see
Section 3.3.1). If you use the standard setting, the maximum angles
for the rudder must be 45°. If the maximum rudder angle is other than
45°. You must use custom calibration.
3. If using a standard resistive rudder angle sender (i.e., American or
European), you may want to consider custom calibration (see Section
3.3.2). The standard sensor values assume that you’re the rudder is at
45° port and starboard at the end of its travel Custom calibration will
use actual minimum and maximum resistive values and allow you to
program the maximum port and starboard angles instead of assuming
that the rudder angle is at 45° at the standard resistive extremes.
4. If using custom calibration, re-calibrate the RAA100 (see Section
3.3.2).
5. If operating in the NMEA 2000
®
/ Analog Gauge Mode, ensure correct
analog gauge resistive values have been configured or programmed
into the RAA100 (see Section 3.2.1)