This minimum RPM is a limit which defines the lowest RPM that the thruster propeller
will be allowed to rotate in either of these two modes. For example, if the minimum RPM
is set to 60% then the range for the thruster propeller RPM will be set to 60 to 100%, i.e.
the thruster propeller will not be allowed to rotate at less than 60% of its maximum RPM.
To set the minimum RPM, proceed as follows:
1
Display the Combinator Control input dialog.
2
Move the focus to the
MIN RPM
field for the thruster and change the value to the
required percentage.
3
Press the
Enter
button.
• The minimum RPM percentage is set to the value selected.
4
Close the Combinator Control input dialog.
Selecting the combinator mode
By combinator control we mean that the system controls both pitch and RPM, and that
pitch and RPM can be controlled separately.
The available combinator modes are:
•
Sequential
The RPM is kept fixed at the
MIN RPM
limit for low force demands. It will only
increase if the force demand is higher than what can be dealt with by varying the
pitch. The pitch setpoint will always be +100% or -100% when the RPM setpoint is
higher than the
MIN RPM
limit.
•
Stepwise
The RPM will be stepped up (or down) if the filtered pitch setpoint is higher (or
lower) than a pre-defined limit. It will never be stepped below the
MIN RPM
limit.
This mode is designed with long term station-keeping in mind. In this mode the
thrusters will step the RPM automatically in varying weather conditions in order to
force the pitch setpoint into a desired working interval.
•
Full
The pitch and the RPM follows a pre-defined trace (combinator curve) with regards to
the force demand.
The
Full Combinator Mode
is similar to the way in which pitch and RPM are
controlled in combinator mode when the thruster is under manual lever control.
To select the combinator mode for a thruster, proceed as follows:
1
Display the Combinator Control input dialog.
2
Move the focus to the
Combinator Mode
field for the thruster and select the required
option.
3
Press the
Enter
button.
• The combinator mode is changed to the selected option.
4
Close the Combinator Control input dialog.
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