RAA100 User’s Manual
Page 8
Revision 1.0
terminal are between 100 and 400 ohms, however, some gauges have very high resistance
(i.e., greater than 3000 ohms). A resistance value over 3000 ohms generally indicates a low
cost, low accuracy gauge (i.e., gauge reading changes with battery voltage even though the
rudder angle is not changing). If the resistance measurement is above 3000 ohms, don’t worry
about recording the exact reading, as the maximum programmable value in the RAA100 is
3000 ohms. Maretron recommends that you custom calibrate (see Section 3.3.2) your system
whenever you are using a gauge with a reading of 3000 ohms or more. Also, you must be
aware that these inexpensive gauges won’t necessarily agree with the digital data available on
the NMEA 2000
®
network as the gauges tend to be inaccurate.
3.3 Standard Sender Selection or Custom Calibration
The RAA100 is capable of accepting standard resistive values with maximum port and
starboard rudder angles of 45° (see Section 3.3.1) or it can be calibrated for any resistance
range between 0 and 300 or 300 and 0 ohms or other values of maximum rudder angle using
the custom calibration procedure (see Section 3.3.2).
3.3.1 Standard
Sender
Selection
The RAA100 can be used with standard resistive rudder angle senders such as the American
Standard (240-30 ohms) or the European Standard (10-180 ohms). This can be a one-step
calibration assuming that the maximum port and starboard rudder angles are 45°. You can
select which type of sender is attached to the RAA100 using a display product such as the
Maretron DSM200. Refer to the user’s manual for configuring the RAA100 as the manual
provides detailed instruction on configuration procedures.
3.3.2 Custom
Calibration
The RAA100 can be custom calibrated for one of several reasons:
1. A non-standard rudder angle sender is being used,
2. The maximum rudder angle (port or starboard) is other than 45°.
Regardless of the reason for custom calibrating the RAA100, you can calibrate the RAA100
using a display product such as the Maretron DSM200. Refer to the user’s manual of the
particular product that will be used for configuring the RAA100 as these manuals provide
detailed instruction on configuration procedures.
4 Maintenance
Regular maintenance is not required, however, an occasional inspection will ensure continued
proper operation of the Maretron RAA100. Perform the following tasks periodically:
•
Ensure that the unit is mounted securely and cannot be moved relative to the mounting
surface. If the unit is loose, tighten the screws holding the cable ties.
•
Check the security of the cables connected to the NMEA 2000
®
interface and the
connections to the gauge or sender and tighten if necessary.
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