Further Operating Elements For Vessels With Classification; Emergency Stop; Enabling Of Control Stations - Aventics Marex OS II Bedienungsanleitung

4.5

Further operating elements for vessels with classification

If a vessel is certified by a classification society (e. g. DNV, GL, ABS, RINA etc.), the technical devices serving to control
the ship must be type-approved by the respective classification societies and have an according certificate.
The Marex OS II remote control was type-approved by numerous classification societies and has the corresponding
certificates.
The remote control, however, only represents a part of the entire system to control a vessel. For this reason, the remote
control is in interdependency with other systems (e. g. alarm system, safety system, steering gear, etc.). The subsystems
were exactly defined by the classification. The three following subsystems must exist on each vessel approved by the
classification society:
Remote control

it serves for remote control of the propulsion system (engine and gear).
Alarm system

to draw the steersman's attention to important technical errors, the vessel must be provided with an alarm system.
This system must possess an acoustic as well as optical error indication.
Safety system

the safety system monitors the engine (e. g. oil pressure, temperature, etc.). If a critical state is reached, the safety
system must reduce the engine speed and, if necessary, even stop the engine.
Steering gear

the steering gear only serves for control of the rudder. This includes beside the actual rudder also systems like bow
and stern thruster.
Each of these subsystems must exist independently from each other according to the instructions of the classification
societies. Beside the remote control an alarm system independent from the remote control, an independent engine safety
system and an independent steering gear must accordingly be existent. If one system fails, the other systems must
continue their operation faultlessly.
4.5.1

Emergency stop

The emergency stop serves to stop the engine. It must operate independently from the remote control, i.e. in case of a
remote control failure the emergency stop must still work. For this reason the emergency stop is integrated in the safety
system and is not part of the Marex OS II remote control.
4.5.2

Enabling of control stations

The vessel is controlled from a control station. In case of larger ships usually several control stations exist. Before the
vessel can be controlled from a control station, the control station must be activated (cf. page 17, chapter 5.2, Change of
control station). After a control station has been activated, the vessel can only be controlled from this control station, all
other control stations are passive.
If the individual control stations are outside the range of sight, a so-called enabling of control stations must exist on the
vessel according to the instructions of the classification societies. This shall prevent an unwilling change of the active
control station and a loss of the ship's control for the steersman. This could, for example, happen due to playing children,
who activate the buttons of a passive control station and initiate a change of the active control station in this way.
From this the requirement results that the transfer of command from the active to another control station must always be
enabled from the active control station.
The function of the control stations' enabling is integrated in Marex OS II as a special function. Often additional buttons
or a rotary switch is installed on the control station, via which the enabling of the control stations is activated. As an
alternative, additional buttons and lamps of the Marex OS II remote control can be used as well.
For the control stations' enabling it must be taken into consideration that these must not only act on the remote control of
the propulsion system, but also on the steering gear. Depending on the classification society, the manufacturer of the
vessel and the customer's request, this can be implemented in different ways. The shipbuilder, who integrates the
different subsystems remote control and steering gear, is responsible for the implementation of the control stations'
enabling. For this reason the description of the control stations' enabling cannot be part of this operation manual. The
function of the control stations' enabling is described by the respective shipbuilder for the entire system of remote control
and steering gear.