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MNL-7178.docx
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4.2.2
“SPAN” Trimpot:
Adjust Range Size
The span adjust trimpot adjusts the range of the meter. The range reported by the RFU will
vary depending on mechanical linkages. This trimpot can be used to calibrate the hard-over
angles. Reference
Figure 1: Rudder Angle Indicator Overview
for the span trimpot location.
4.3
F
UNCTIONAL
T
EST
Before commencing normal operations with the installed unit(s). A functional test shall be
conducted to ensure proper operation of the system as per the intended application and
configuration.
Functional testing should be done by qualified personnel only. The
system functionality should be fully tested dockside before an open
water sea trail is performed to ensure proper response of the
system based on rudder commands.
After installation perform the following function tests:
1.
Center the rudder
a.
Ensure that the meter displays 0°. If not, first adjust the RFU lever arm until it is
centered at 0°. If the RFU lever arm is already centered then the potentiometer
inside the RFU will require adjustment.
2.
Move the rudder to hard-over
a.
Ensure that the meter displays the hard-
over angle. If not, adjust the ‘Span’
trimpot until it is at the correct angle.
