Troubleshooting
Page 27 of 31
Doc No.: MAN01502, 27-02-01 SCA 300 Manual
5 TROUBLESHOOTING
5.1 Simple Problems and Solutions
WARNING: FAILURE TO CORRECT ANY PROBLEM CAN CAUSE SUDDEN
LOSS OF STEERING.
The table below gives some general solutions for simple problems. If a
problem cannot be solved, contact Jastram.
SYMPTOM CAUSE CORRECTION
In NFU mode the NFU
input device steering
direction is backwards.
Port and Starboard NFU
steering commands are
reversed.
Refer to the NFU steering
input device manual.
Reverse the NFU input
commands.
In NFU mode the NFU
input device only steers in
one direction.
Incorrect wiring
connections to either the
NFU steering input device
or the directional solenoid.
Refer to section 2 and the
NFU steering input device
manual. Correct wiring
connections.
In FFU mode the system
always swings to hard
over.
Feedback signal polarity is
reversed.
Refer to the RFU manual.
Reverse the polarity of the
feedback signal.
Incorrect wiring
connections to FFU
steering input device.
Refer to section 2 and the
FFU steering input device
manual. Correct wiring
connections.
In FFU mode the FFU input
device steering direction is
backwards.
FFU input signal polarity is
reversed.
Refer to the FFU steering
input device manual.
Reverse the polarity of the
FFU input signal.
The FDBK GAIN trim pot in
the SCA 300 can not turn
far enough to make the
rudder turn to its internal
limit angle.
The feedback GAIN in the
RFU (rudder feedback
unit) is too small.
Refer to the RFU manual.
Increase the feedback
signal GAIN.
Under FFU steering, the
hard over angles of the
rudder are unacceptably
unbalanced
The steering input device
is not correctly centered.
Refer to section 3 “Setting
Internal Limit”.
Steering gear can not be
turned back toward center
after reaching hard over.
Incorrect limit switch in
RFU is being triggered.
Refer to the RFU manual.
Check and set limit
switches.
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