Maretron M001101 User Manual

 

 

If you notice unexpected operation of the Maretron RAA100, follow the troubleshooting 
procedures in this section to remedy simple problems. 
 

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)