PROPILOT 700
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7.9 Motor Speed Control
PWM (Pulse Width Modulation) is a method of controlling the
speed of the steering motor of the vessel’s drive unit so that rudder
operation is smooth. This is especially useful if the vessel has a
high steering inertia.
Motor Speed Control and the Motor Speed Reduction Angle are
used to assist PWM, to achieve smooth rudder operation.
d100 Motor Speed Control is the amount of power, output from the
Drive Unit, needed to move the rudder between its limits in a time
suitable for the vessel.
The Motor Speed Control setting starts at 100%, which is the
maximum rudder speed the selected drive unit can provide, press
the key to reduce the power (increasing the Hardover time), to
achieve the Hardover to Hardover time calculated for your system
(Hardover time is double at 50% power).
As a guide, the Hardover to Hardover time will be approximately:
Planing vessels 8 - 12 seconds
Semi-Displacement vessels 11 - 16 seconds
Displacement and Sailing vessels 15 - 18 seconds
The range is from 100% to 50% in increments of 5%.
P0ff There are a few conditions when PWM is a disadvantage, such as
running down wind with a large following sea. To switch PWM
off, press the key until “POFF” is displayed.
Figure 11 - Motor Speed Control / Rudder Angle
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