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Tunnel Thruster function
The operation of tunnel
thruster
maintaining the heading
with nearly no speed.
The typical tunnel thruster
characteristic
illustrated by the following
graph:
The illustration shows that
in order to obtain 50%
thrust, the control signal
must be nearly 8V (appr.
75% of the 10V). To obtain a
thrust amount, capable of controlling the vessel, a certain minimum
level of thruster control signal should be applied to the thruster for a
minor heading error.
Special parameters for Thruster Function appears in INFO LOOP II
when Thruster Function switch is set to THRUSTER.
Thruster Deadband
The Deadband determines
the amount of error signal
(in
command is applied to the
thruster.
shows ±5 degree deadband.
No deadband is shown by
the dotted line.
Minimum Thrust
The
determines
power (in % of maximum
control signal) that is applied as
"first command signal". The
example shows 30% of the
control
minimum thrust.
The dotted line shows the
output signal for Minimum
Thrust "OFF".
20169223D
is
used
for
can
be
degrees)
before
The
example
Minimum
Thrust
the
amount
signal
applied
U
+10V
Appr. 8V
5V
100%
50%
+10V
(100%)
3°
Deadband
+10V
of
(100%)
30%
as
Installation
Linear function
Thrust
50%
100%
Deadband OFF
U
3°
Heading error
-10V
U
Minimum
thrust OFF
Heading error
5-57
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