DC Bus Distribution


The DC Bus interconnects all GreenInverters and GreenBatteries which are installed at different locations. DC Bus Distribution Cabinets include cable connections for all DC Bus cables and the cables are protected for short circuit by DC Bus fuses inside the cabinets.  DC Bus tie breakers are able to separate port and starboard side propulsion and power generation in case of abnormalities.


DC Bus Power Inverter


GreenInverter covers applications for electric motor and generator drive and includes battery charging with GreenPower generator sets or with shore power. In addition, a GreenInverter AC is available for AC grid generation to support hotel load. GreenInverter is available in power ranges from
100kW to 2.2MW. GreenInverter is connected to the DC Bus with a nominal voltage of 832VDC. A DC Bus contactor and other safety devices are built into each GreenInverter.

Green Inverter high Power Inverter

GreenInverter covers applications for electric motor and generator drive and includes battery charging with GreenPower generator sets or shore power as well. GreenInverter is built-up in a modular way, supporting applications from 100kW to 2.2MW. GreenInverter is a four quadrant controller with active front end technology. Motor operation changes into generator operation as soon as a motor is driven by propeller (brake energy) or combustion engine (parallel hybrid). The generated energy is used for GreenBattery charging. GreenInverter includes independent safety systems such as Safe Torque Off on AC side and DC Bus contactor on DC side. The contactor also supports pre-charging and discharging in order to safely connect and disconnect GreenInverter from DC Bus. GreenInverter is optimized for DC Bus voltages in between 650VDC and 975VDC and a nominal current up to 450A. This results in a rated power range from 350kW to 500kW. Multiple GreenInverters can be paralleled to increase the power up to 2.2MW. GreenInverter is IP67 protected and can
be bulkhead mounted.

GreenInverter is designed to be installed close to the device to be controlled for distributed DC Bus applications. However, centralized installation of GreenInverter is supported as well.  GreenInverter is built-up with two controllers: a dedicated Digital Signal Processor for four quadrant motor and generator control functions and a Control Processor with four Ethernet ports for programming PLC functions in accordance with IEC61131 standard. GreenInverter is equipped with a local operator panel consisting of a 5″TFT touch display and an emergency stop switch. Most relevant parameters such as power, current and voltage are continuously displayed on the 5″TFT.

GreenInverter is also available for following:

  • DC/DC conversion
  • AC grid generation
  • GreenInverter DC/DC
  • GreenInverter AC

These GreenInverters are based upon the standard GreenInverter and extended with magnetics. In addition, a low power GreenInverter LP is available for e.g. steering motor and bow thruster.


DC Bus Battery Storage


GreenBattery is a safe, highly efficient and modular energy storage system with relatively low weight and small volume. Each GreenBattery has a capacity of 80kWh and a nominal DC Bus voltage of 832VDC. Multiple GreenBatteries can be mounted in parallel to realize energy storage systems ranging from 80kWh to 4MWh. Each GreenBattery includes a Master BMS and DC Bus contactor. Various safety devices are built into GreenBattery. In the unlikely event of a battery cell explosion, it does not propagate to other cells (no thermal runaway) and it is contained inside the
battery housing in order to guarantee a safe energy storage system without pollution to the surrounding environment of GreenBattery.

GreenBattery Electric Energy Storage

GreenBattery is a highly efficient and modular energy storage system with relatively low weight and small volume. Each GreenBattery has a capacity of 80kWh and a nominal DC Bus voltage of 832VDC. Multiple GreenBatteries can be mounted in parallel to realize energy storage systems ranging from 80kWh to 4MWh. Each GreenBattery is built up with 8 individual batteries and a Master BMS. The Master BMS contains a 5”TFT touch operator panel with controller and includes a DC Bus contactor and heat exchanger. All external connections are made available on the Master BMS.

Various safety devices are built-in for preventing thermal runaway. In the unlikely event of a battery cell explosion, it is contained inside the battery housing in order to guarantee a safe energy storage system without pollution to the surrounding
environment of GreenBattery. Each battery is totally enclosed and GreenBattery includes a pressure based safety release which should be vented to the outside environment.

GreenBattery is liquid cooled by seawater or water/ glycol and a built-in controller regulates battery temperature in between 20 and 40 degrC. GreenBattery can be placed in any room with the ambient temperature up to 55 degrC. GreenBattery does not heat-up the room.



Battery Management

The batteries are built up with Lithium NCA technology battery cells which have considerable lower weight and higher power density when compared to other battery chemistries. In addition the applied Panasonic battery cells have a long track record and are widely used in electric cars. Each
battery has 12 temperature measurements and a built-in BMS (Battery Management System) which communicates with the Main BMS. The Main BMS 5”TFT touch operator panel contains redundant Ethernet ports for communication to GreenInverters for charging/discharging and GreenEMS for energy management. GreenBattery fulfils the latest class requirements and a risk based assessment is made for every project and approved by class. GreenBattery is supplied in two different mechanical lay-outs: a vertical one for space  saving and a horizontal one with a lower center of gravity.


DC Bus Generator


GreenMachine is a highly efficient permanent magnet electrical machine for propulsion and electric power generation. Low speed versions of GreenMachine are available for direct mounting to a propeller shaft without gearboxes. Medium and high speed versions
are available for connecting to third party thrusters and gearboxes (parallel hybrid). GreenPower consists of a variable speed combustion engine connected to a GreenMachine acting as electric generator. In this way a highly efficient and light weight electric power generator plant is realized to further support a green environment.


GreenMachine and GreenPower

GreenMachine is a highly efficient permanent magnet electrical macine for propulsion and electric power generation.  GreenMachine is available in RPM ranges in between 266  (low speed direct drive of propeller shaft) and 3600 (high speed generator set). GreenMachine can be either flange or bracket mounted. In addition, customer can choose between hollow shaft or solid shaft on one side or on both sides of the machine.  In case of parallel hybrid applications, the low speed GreenMachine can be connected to the propeller shaft on one side and the other side can be connected to the output shaft of gearbox.

GreenPower is built-up with a light weight and high speed diesel engine connected directly to a highly efficient GreenMachine electric generator. In this way a very compact and efficient generator set is realized. GreenPower can be built-up with diesel engines from Hyundai, Volvo, Steyr and Cummins. Flange mounting connections, vibration damping plates and other specifications can easily be adapted to accommodate other combustion engines.

GreenMachine and GreenPower are cooled by water cooling (50% water/50% glycol). Each GreenMachine and GreenPower is controlled by a GreenInverter which is connected to DC Bus of nominal 832VDC.

Electric Winch

Electric Fin Stabilizer

Electric Propulsion Motor


GreenMachine is a highly efficient permanent magnet electrical machine for propulsion and electric power generation. Low speed versions of GreenMachine are available for direct mounting to a propeller shaft without gearboxes. Medium and high speed versions are available for connecting to third party thrusters and gearboxes (parallel hybrid). GreenPower consists of a variable speed combustion engine connected to a GreenMachine acting as electric generator. In this way a highly efficient and light weight electric power generator plant is realized to further support a green environment.




GreenMachine and GreenPower

GreenMachine is a highly efficient permanent magnet electrical macine for propulsion and electric power generation.  GreenMachine is available in RPM ranges in between 266  (low speed direct drive of propeller shaft) and 3600 (high speed generator set). GreenMachine can be either flange or bracket mounted. In addition, customer can choose between hollow shaft or solid  shaft on one side or on both sides of the machine.  In case of parallel hybrid applications, the low speed
GreenMachine can be connected to the propeller shaft on one side and the other side can be connected to the output shaft of gearbox.

GreenPower is built-up with a light weight and high speed diesel engine connected directly to a highly efficient GreenMachine electric generator. In this way a very compact and efficient generator set is realized. GreenPower can be built-up with diesel engines from Hyundai, Volvo, Steyr and Cummins. Flange mounting connections, vibration damping plates and other specifications can easily be adapted to accommodate other combustion engines.

GreenMachine and GreenPower are cooled by water cooling (50% water/50% glycol). Each GreenMachine and GreenPower is controlled by a GreenInverter which is connected to DC Bus of nominal 832VDC.

Advantages of electric propulsion


There are two main reasons to change to electric propulsion: zero emissions during electric propulsion and fuel efficiency. Fuel efficiency can be increased with electric propulsion when there is a large difference in operating hours at e.g. cruise speed and maximum speed (or power). The  reason for this is that the combustion engine is running only at optimal efficiency when fully loaded; at all other operating points efficiency drops. Electric propulsion when combined with combustion engines realizes that the combustion engine is running at optimal efficiency most of the time, by using the spare power for charging battery packs and/or by switching off one or more combustion engines depending on load requirement.    In addition, electric motor propulsion, especially when combined with steerable thrusters, gives a much better maneuverability when compared to combustion propelled vessels as the RPM can be easily controlled from zero to maximum. Some ship applications also require strongly reduced noise emission and this can be realized with the GreenPod steerable thruster as the electric motor is mounted ‘under water’ for optimum noise reduction.

Full electric propulsion

The full electric propulsion uses an electric motor to drive the propeller shaft. Electric power is coming from battery banks and charging is done through shore power. Combustion engines are not installed. With large batteries you can have long periods of electric propulsion and the AC grid for hotel load is generated from the battery bank too. The highly efficient GreenPod steerable thruster perfectly fits into full electric applications.

Serial hybrid propulsion

The serial hybrid also uses an electric motor to drive the propeller shaft.  Electric power is coming from battery banks or, when battery bank is empty, from a combustion generator set. Charging of the battery bank is done through the combustion generator set or by shore charging. With large batteries you can have long periods of electric propulsion without the need for combustion engines to run as the AC grid for hotel load is generated from the battery bank too. The highly efficient GreenPod steerable thruster perfectly fits into full electric applications.


Parallel hybrid propulsion

The parallel hybrid  propulsion system uses both a combustion engine and an electric motor to drive the propeller shaft. In fact, the combustion engine and the electric motor are mounted in parallel.

Parallel mounting is generally done in one of two ways:

  • The propeller shaft from the combustion engine is split in two parts and the electric motor is mounted in between the two shaft parts. This means that the electric motor is mounted in-line with the propeller shaft. The electric motor has also to carry the usually much higher load from the combustion engine.
  • The highly efficient permanent magnet electric motor with hollow shaft fits this purpose. The electric motor is mounted on an additional input of the gear box which is mounted in between the combustion engine and the propeller shaft.

Parallel hybrid propulsion allows you to drive the propeller shaft by either the electric motor or the combustion engine or by both (boost mode). In case the vessel is propelled by combustion engine, the electric motor acts like a generator which can be used
for charging the battery banks.

In case there is a big difference in between operating hours at cruising speed compared with operating hours at maximum speed/power it makes sense to install a parallel hybrid system. The relatively small electric motor can propel the vessel at cruise speed for longer periods. When maximum speed/power is required, the large combustion engine takes over the propulsion and the electric motor is used as generator for charging the batteries. The parallel hybrid has built-in redundancy as the shaft can be driven by either the electric motor or the combustion engine. The highly efficient GreenMachine perfectly fits into parallel hybrid applications.

Diesel-electric propulsion

A diesel-electric propulsion system uses generator sets to generate electric power for the electric propulsion motors. The generator sets consist of a combustion engine, which could be gas or diesel, and is connected directly to an electrical generator. The electric propulsion motor is connected directly to the propeller shaft. The diesel electric system usually has multiple generator sets and multiple electric motors connected to a common electrical DC bus. The highly efficient GreenPod steerable thruster and the GreenMachine electric generator fit perfectly into diesel-electric applications. Note that there is no electric storage of energy in a diesel electric propulsion application.

Electric Steerable POD propulsor


GreenPod is a highly efficient steerable thruster covering propulsion applications from 100kW to 2.2MW. Two versions are available: an electric motor mounted ‘under water’ in line with propeller shaft and a version with a so called L drive with electric motor mounted inside hull on top of the thruster. GreenPod contains a permanent magnet high efficiency electric motor to support a green environment. Up to two electric steering motors provide 360 degrees steering functionality of GreenPod.

GreenPod Steerable Electric Thruster

GreenPod steerable electric thruster is designed as a highly efficient fit and forget propulsor that additionally saves  a lot of engine room space. In fact, due to its low height GreenPod can be mounted in almost any location.

Two versions are available:

  • Pod with electric motor mounted ‘under water’ in line with propeller shaft.
  • L drive with electric motor mounted inside hull on top of the L shaped propeller shaft\

GreenPods are available in sizes in between 100kW and 2.2MW. The highly efficient permanent magnet electric motor increases efficiency to support a green environment.

Up to two electric steering motors are mounted on top of GreenPod for reliable and fail safe steering. GreenPod electric propulsion motor is controlled by GreenInverter and the steering motors are controlled by a low power version of GreenInverter. These GreenInverters can be mounted on top of GreenPod for simplified and trouble free installation. GreenInverters are connected directly to DC Bus and to Ethernet communication lines.

Three different propeller configurations can be supplied:

  • Pushing : standard configuration up to 12.5 knots
  • Dual propeller : contra rotating propellers for speeds above 12.5 knots
  • Nozzle : to increase efficiency at speeds below 5 knots to realize highest bollard pull

Fleet Management System

The Fleet Management System (FMS) allows the ship owner (shore) to view the Ship Automation System (ship) through the internet


The PRAXIS Fleet Management System (FMS) is an Internet-based application for the monitoring and reporting of data derived from  seagoing vessels. All data will be collected from the vessels´ Alarm- and Monitoring systems in a fully automated manner and will be transferred to the database meeting highest security standards. The Fleet Management System offers the following functions to the shipowners:

  • The Fleet Overview page lists user selectable status information for all vessels of the fleet.
  • The Vessel View page shows user selectable parameters of individual vessels including the possibility to highlight vessel- related information of special interest –  e.g. the fuel consumption or the CO² emission rate.
  • The automated creation of reports on the Statistic  View page allows to plot freely selectable parameters over adefined timespan.
  • The Map View shows the recent position of any individual vessel.

Onshore monitoring of relevant fleet parametership Cloud Server

One major aim of the FMS is to significantly reduce the administrative effort of the report creation – e.g. CO² emission reports according to the IMO MRV rule. These documents can be created in a fully automated manner.

At the same time the FMS helps shipowners with the optimization of cost-critical parameters, as their vessels’ fuel economy, e.g. by comparing fuel consumption over speed plots of different  vessels or timespans.

Next to the shoreside fleet-monitoring functions the vessel operations will benefit from direct shoreside guidance of individual vessels during critical situations.

Vessel View

The Vessel View offers a cockpit window including the current status of selectable hotspot parameters.  It includes an overview of your range of predefined reports in order to track any available channel over time.

If required you are able to enter the vessel’s AMS system view via a remote desktop connection.

Please Note:

  • Next to standard parameters, as fuel consumption, speed and position data, a wide range of indications can be created for every single vessel. These can include tank, trim and list gauges and all kind of engine related parameters.

Position View

The Position View offers a map view including all vessels of your fleet equipped with the PRAXIS FMS system.

It includes the tracked route and a heading projection. Individual vessels may be selected to enter the Vessel View.

Please Note:

  • This function is due to the availability of vessel specific GPS/ and AIS information.


System layout

In order to provide on-shore operational staff access to both vessel and fleet data instantly the PRAXIS Fleet Management System consists out of the following components:

  • The Interface Application running on the PRAXIS Shipview MPC connects the automation system and the vessel’s communication equipment which is accessible via the Internet.
  • The SQL database stores the data feed out of the selected automation channels at an adjustable time schedule.
  • The Web application runs on the application server to provide the SQL database functions to the HTML website. It interacts with the interfaces onboard.
  • The Frontend Application enables the user to comfortably access all system functions.

After a successful login onto the Fleet Managemant System the Fleet Overview screen appears. The Fleet Overview page contains the following functions:

  • It offers a menu including all vessels of the customer specific fleet equipped with the PRAXIS FMS system.
  • It lists compact freely definable status lines for each vessel.
  • It enables the customer to select any individual vessel in order to enter the vessel specific view.

The FMS is part of the modular range of PRAXIS ship automation solutions, ready to provide the flexibility needed to meet each individual vessel’s demands. Any digital or analog onboard sensor and every serial interface can be connected via the vessel’s automation environment.

This modular approach means that the FMS solution can adapt to collect data from any marine environment, from the basic up to the most complex ones, and provide it to the onshore staff in a comfortable and reliable manner.

With a PRAXIS automation system including the FleetView adapter being present onboard a vessel the installation process of the FMS can be completely performed online. This approach saves both, time and cost.

Also, the maintenance and service effort of all PRAXIS automation components onboard will be significantly reduced due to the online access possibilities. In many cases an onboard service attendance might become obsolete.
However, if it is required to physically visit the vessel, our worldwide team of fully trained service agents will be on hand to provide maintenance to any vessel, wherever it may be.

Fleet Overview

After a successful login the Fleet Overview screen appears. This page contains a menu including all vessels of the customer specific fleet equipped with the PRAXIS FMS system.

It lists compact and freely definable status lines for each vessel with the possibility to put the focus to a vessel of specific interest.

It enables the customer to select any individual vessel in order to enter the vessel specific view.

Statistic View

The Statistic View enables the user to print a set of selectable vessel specific parameters over a definable timespan.

Additionally, special report functions can be realized. This includes the plotting of definable parameters (e.g. the fuel consumption) of the currently selected vessel in comparison with the same parameter of a different vessel within his fleet.

On-Board interfacing hardware

The PRAXIS Fleet Management System as Internet-based application will connect to the vessel’s PRAXIS Alarm Monitoring and Control Systems using the PRAXIS Shipview System as interfacing hardware between the automation and the vessel’s communication equipment which is accessible via the Internet.  PRAXIS Automation Systems can be connected directly to the PRAXIS Shipview System via their system main system bus. The onboard hardware is based upon a ruggedized Ship View MPC equipped with PRAXIS Mega-Guard and secure communication software.



Mounting & dimensions

Ship Performance Monitor

The Mega-Guard Ship Performance Monitor measures and displays the actual fuel consumption with the actual power delivered


The Mega-Guard Econometer System (ES) measures and displays the actual fuel consumption with the actual power delivered. In addition, the fuel consumption is totalized and available to be loaded on USB stick. The Econometer System helps to realize IMO legislation SEEMP (Ship Energy Efficiency Management Plan). The Econometer System (ES) has the following system features:

  • Continuous Torque, power and speed measurement
  • Calculation of absolute and relative fuel consumption
  • History data recording and display capability
  • History data retrieval via USB- or Ethernet file transfer
  • Optional NMEA or MODBUS interface to external system 8,4″ Operator Panel with Graphic Mode

Value Mode

The TFT screen is displaying a set of data on a mimic. The user can choose out off different datasets displaying power, torque and speed data on the mimic. For multiple engine or shaft configuration, each engine or shaft data may be displayed at the same time or separately.

  • Torque, power and speed Fuel consumption (l/hr, GPH, t/hr)
  • Fuel consumption per NM
  • GPS speed (SOG)
  • Voyage cumulative

This mode also includes controls for trip based logging.

Graph Mode

In graph mode, the TFT screen displays a chart style graph showing the evolution of one user selected data (torque, power, speed, absolute or relative fuel consumption) over time.

Stat Mode

The Stat screen gives access to calculated statistics for the torque, power, speed and fuel consumption data. The system presents the average (AVG), maximum (MAX), and minimum (MIN) values for the last minute, the last hour or the last day.

Configuration screen

The Configuration screen allows the user to view the configuration status, to change the system configuration, to transfer data and to access the sensor calibration mode

System Hardware

24 channel Analog and Digital Input I/O Module

8.4” Colour Graphic TFT with 12 pushbuttons

  • Dimensions: L=240mm, W=160mm, H=51mm
  • 12 configurable pushbuttons
  • NMEA input (RS485)
  • Optional MODBUS or NMEA output (RS485)
  • USB maintenance port
  • Power supply 24Vdc
  • Power consumption: 15W

24 channel Analog and Digital Input I/O Module

  • Dimensions: L=198mm, W=127mm, H=29mm
  • LED alarm indicator and text window for each channel
  • 32 bit ARM CPU
  • 24 analog or digital input channels with software selectable input ranges
  • Galvanic isolation of input to internal logic and to external modules
  • I/O Connector including power supply input
  • Earth fault detection on inputs
  • Out of range , open circuit and short circuit detection on inputs
  • Power consumption: 15W

Torque meter 4~20mA / Flow meter 4~20mA

Shaft Torque Meter

  • Optical measuring principle
  • Extreme accuracy of optical sensor
  • Wireless transmission of data and power

Fuel oil Flow Meter

  • Capacity from 120 to 380 l/min, continous max.
  • Measuring accuracy +/- 0.2%
  • PT100 input for temperature compensation

Wiper Control System

The Mega-Guard Wiper Control System (WCS) controls up to 9 windshield wipers.


The Mega-Guard Wiper Control System (WCS) controls up to 9 windshield wipers. Each wiper has its own on/off pushbutton and fore and aft wipers are grouped together for simultaneous on/off control.

Separate Aft and Fore pushbuttons are available for Low/High Speed, Heating and Washing functions. In Low speed mode the interval can be varied with the Interval+ and Interval- pushbuttons.

The wipers are synchronized with each other. The washing function includes spraying, wiping and purging.

The Mega-Guard Wiper Control System supports multiple Operator Panels. A typical lay-out includes two Wiper Operator Panels: one installed in fore bridge and one installed in aft bridge. The Operator Panels are inter-connected by a redundant Ethernet network.

A text sheet with a representation of the bridge lay-out is inserted in the front of the Wiper Control System to get a realistic on/off control of the window wipers.

System lay-out

The Mega-Guard Wiper Control System consists of three items:

  • Wiper Operator Panel Size: 144x144x55mm (WxHxD) for flush panel mounting.
  • Wiper I/O Module Size: 127x198x29mm (WxHxD) for Din rail mounting.
  • I/O Cable in between Wiper Operator Panel and Wiper I/O Module with a length of 3 or 5 meter.

The Wiper Operator Panel is flush mounted in the bridge console and contains the wiper pushbuttons and a LCD display for diagnostic messages. The LCD display is  also used to configure the system during installation. A menu driven interface is avaialble for setting all parameters of the Wiper Control System.

The Wiper I/O Module is DIN rail mounted inside the bridge console and the wipers and power supply are directly connected to this module. In addition, the module is  equipped with manual on/off switches for each wiper. The I/O Module should be mounted in such a way that it can be reached without using tools in order to make use of this function.

The I/O Cable connects the Wiper Operator Panel and the Wiper I/O Module.

The Wiper Operator Panel is equipped with:

  • 9 buttons for controlling individual wipers.
  • Wipers Fore button for activating all Fore wipers.
  • Wipers Aft button for activating all Aft wipers.
  • High Speed Fore and Aft buttons for toggling low speed / high speed.
  • Interval- and Interval+ buttons for increasing/decreasing the cycle time for low speed operation
  • Heating Fore and Aft buttons for heating the windows.
  • Wash Fore and Aft buttons for washing the windows.
  • Ack button for acknowledging alarms.
  • Stop Horn button for deactivating the external horn and the internal buzzer.
  • System On and Fault LED’s.
  • Left Arrow and Right Arrow buttons used for dimming and entering Installation mode.
  • LCD display.
  • Internal buzzer.
  • Power supply input: 19~32VDC which is connected to the Wiper I/O Module.
  • I/O Bus connector to connect to I/O Cable.
  • Fail output (voltage-free).
  • Horn output (voltage-free).
  • USB port to connect a USB memory stick.
  • Ethernet port to connect to other Mega-Guard Operator Panels.

The Wiper I/O Module is equipped with:

  • 9 pcs Wiper High speed output.
  • 9 pcs Wiper Low speed output.
  • 2 pcs Wash output.
  • 2 pcs Heat output.
  • 2 pcs Purge output.
  • Power supply input 19~32VDC.
  • Power supply output: 19~32VDC which is connected to the Wiper Operator Panel.
  • I/O Bus connector to connect to I/O Cable.

Other operator modes:

  • Adjustment of dimming level: Arrow Left (less brightness) and Arrow Right (more brightness) pushbuttons. Note that the dimming level is also transmitted via the Ethernet network so that other connected Mega-Guard Operator Panels are dimmed to the same dimming level automatically.
  • Entering Installation mode: Installation mode is active when the correct personal code is entered. This can be achieved by pressing Arrow Left and Arrow Right simultaneously and than Enter Password will be displayed on the LCD display. The password is a sequence of pressing 4 keys in the correct order which is programmed during installation. This can be any key sequence available on the frontpanel of the Wiper Operator Panel. Note that the configuration data can be stored and loaded through a USB memory stick. In this way, it is very easy to make a back-up and to program a sister vessel as the configuration data can be copied from the USB memory stick.

Vessel Management System

Vessel Management System (VMS) is the perfect automation solution for medium to large size vessels


The Mega-Guard Vessel Management System (VMS) is an advanced system for perfect ship automation for medium to large size ships. Mega-Guard VMS is a modular system which can be tailor made based upon ship’s  automation  requirements. Often realized functions with Mega-Guard VMS include the following:

  • Alarm and monitoring system
  • Extension alarm system
  • Valve, pump and fan control
  • Cargo control and monitoring
  • Tank gauging
  • Fuel oil transfer
  • Automatic ballasting
  • Anti heeling
  • Firefighting
  • Conning
  • CCTV
  • Etc.

In addition, Mega-Guard VMS can be extended with the following independent Mega-Guard systems as described in separate brochures:

  • Alarm and monitoring system
  • Extension alarm system
  • Power Management System
  • Propulsion Control System
  • Dynamic Positioning System
  • Integrated Navigation System
  • Heading Control System
  • BNWAS Watch Alarm System
  • Navigation Light Control
  • Wiper Control system
  • Fire Alarm System
  • Econometer
  • Internet Fleet Managment

Mega-Guard VMS can also be easily integrated with the Mega-Guard Green Propulsion product line which consists of:

  • Electric Steerable POD propulsor
  • Electric Propulsion Motor
  • Electric Fin Stabilizer
  • Electric Winch
  • DC Bus Generator
  • DC Bus Battery Storage
  • DC Bus Power Inverter
  • DC Bus Distribution



The Mega-Guard Vessel Management System is the most reliable and field proven automation system as can be found on the market and is built-up with the following components and features:

  • Operator Workstations
    Workstations are equipped with touchscreen and an integrated marine personal computer under Windows 10 embedded operating system. Solid state disk instead of hard disk is applied and multi-server structure ensures safety and reliability. The ruggedized Operator Workstations are available in touchscreen sizes ranging from 10” to 55”. The high definition widescreen Workstations are available with HD (1920×1080) and UHD (3840×2160) resolution. The Operator Workstation can be extended with a Trackpad and Trackball Operator Panel and a hard copy printer.
  • Control Processors
    Control and monitoring logic (PLC) is executed by powerful Control Processors. Sensor inputs and actuator outputs are connected to I/O Modules.  A Control Processor has four Ethernet ports and up to eight I/O Modules.  A Control Processor is also able to communicate with external
    systems through multiple protocols over Ethernet, RS485/422 and Canbus communication links. Control Processors and I/O Modules are mounted on DIN rails inside cabinets, switchboards and consoles.
  • Operator Panels
    Operator Panels combine local operation and control logic in one device. An Operator Panel is built-up with a 5.7” or 8” touchscreen and a built-in Control Processor which is able to communicate to up to eight I/O Modules. Example applications include  Extension Alarm System, Power  management System, Propulsion Control System and Fire Alarm System. The stylish Operator Panel is flush mounted.
  • Redundant Ethernet
    Operator Workstations, Control Processors and Operator Panels are interconnected by redundant Ethernet link. Cabling with Star topology or Ring topology or a combination of Star and Ring topology is supported.
  • Configuration standard
    Programming in accordance with international PLC programming standard IEC61131-3 (ST) and 3D graphic design in accordance with latest standards.
  • Type approval
    Type approved by all major class classification societies such as Lloyds Register of Shipping, DNV-GL, American Bureau of Shipping, Bureau Vertitas, RINA, Russian Maritime Register of Shipping, CCS, NKK, PRS, KR etc.

Swiping and zooming

Operator Workstations and Operator Panels are equipped with the latest 3D graphic software package for an intuitive and dynamic operation. The Workstation touchscreen allows for instance swiping in between pages and swiping to alarm list.  The zooming function provides more detailed information regarding the zoomed-in area. Up to 4 layers of additional data can be presented depending on the zooming level. Pop-up menus give more detailed information regarding the selected device as well. The pop-up can be made in a realistic way (photo) so that it resembles the actual
to be controlled device.


The Extension Alarm System (EAS) is a highly reliable engineer calling system, which extends the Mega-Guard VMS for unmanned machinery space operation. On duty selection and engineer calling functions are executed on a dedicated mimic on the Workstation.

The dedicated mimic display on the Workstation contains the following fields:

  • On duty selection
  • Attended / unattended (manned/
  • unmanned) engine room
  • Engineer calling
  • Patrol timer / engineer safety system (dead man timer)

EAS Operator Panels are installed in bridge and accommodation areas. They provide detailed alarm and on duty information on the 5.7” touchscreen. In addition the operator is able to select grouped data such as fuel tanks, main engine, generators etc for viewing. The touchscreen has an automatic sleep function and awakes again when an alarm is presented or when the touchscreen is touched.

Marine PC

The Workstation contains a built-in Marine PC. The Marine PC is also available as a separate product and this is used when a 3rd party monitor is applied. The Marine PC is very compact and can be bulkhead mounted. The Marine PC is available in two versions:

  • Standard version with Intel quad core Celeron CPU at 2Ghz
  • High performance version with Intel dual core I5 CPU at 3GHz

Both versions require extremely low power which guarantees a long life and a high mean time between failure. Solid state disks are available in ranges from 32GB (standard) to 256GB. The Marine PC is powered by 24VDC and contains relays outputs for failure indication and connection of an external horn.



VMS Market segments

The VMS Vessel Management System is applied in all type of ships. Three market segments are distinguished:

  • Commercial ships
  • Mega yachts
  • Navy ships

VMS Workstations and Operator Panels for mega yachts are delivered with highly esthetic glass fronts and for commercial ships a metal front with pushbuttons is applied. Navy ships require a more robust VMS with higher shock and vibration resistance.  In addition, navy ships require added  functionality such as battle damage control.

The Internet Ship View (ISV) system allows the ship owner (shore based) to view the VMS Vessel Management System (ship based) through the internet. Shore based standard PC’s with internet browser can be used to log-in to the VMS. This gives the same view as available on the ship based VMS Workstations. Praxis service department is also able to log-in in case of requests for commissioning support or trouble shooting. Secure communication and double log-in procedures are applied for protection against unauthorized users.

Trackpad and Trackball

Workstations can be operated with touchscreen. In addition to this two types of input devices are available: a Trackpad and Trackball Operator Panel. The Trackpad Panel offers a large trackpad for accurate and easy selection of the required function on the Workstation or monitor. The Trackball Panel is equipped with a trackball for function selection and a keypad is also integrated in this panel.

Touchscreen Operator Panels are flush mounted in console, wall or cabinet. The 5.7” touchscreen Operator Panel is applied in commercial ships and mega yachts (glass version). The 8.4”touchscreen Operator Panel is mainly used for navy ships.

Example Mimics

Mimics are designed in close cooperation with ship owner

Colors, fonts and symbols are freely selectable

 Direct swiping to Alarm Page and Main Overview Page 

3D effects can be applied in the mimic

Intelligent zooming with additional info layers

CCTV cameras embedded in the mimics

Mounting & Dimensions

Propulsion Control System

Propulsion Control System (PCS) for automation of all types of main propulsion and engines


The Mega-Guard Propulsion Control System (PCS) is an advanced system for perfect remote control of thrusters and engines. Propulsion plants are available in many variations which are all covered by Mega-Guard PCS. Example propulsion configurations include:

  • fixed pitch propeller (FPP) with reversing gearbox
  • variable pitch propeller (CPP)
  • steerable thruster with either FPP or CPP
  • waterjet
  • one to eight thrusters
  • combustion engine or electric motor
  • hybrid configurations

Mega-Guard Propulsion Control System is built-up in a modular way suitable for all ships and applications. The PCS includes remote control, engine safety, RPM/pitch indication, telegraph and electronic governor functions. The  Mega-Guard PCS receives orders from the Control Lever on bridge and control room. The remote control system gives a thrust (RPM and/or pitch) setpoint  and activates starting, stopping and reversing mechanisms. Steerable thrusters (azimuth control) are also supported by Mega-Guard PCS.

The Mega-Guard Propulsion Control System can be extended with Mega-Guard Electric Propulsion Motors, Mega-Guard Electric Steerable POD propulsors and Mega-Guard Battery Storage to suit full electric and hybrid propulsion applications.

Mega-Guard PCS is built up with the following main components:

  • PCS Control Levers flush panel mounted in bridge, bridge wings and ECR console
  • PCS Operator Panels flush panel mounted in bridge, bridge wings and ECR console
  • PCS Controller installed in PCS Cabinet or bridge or ECR console
  • PCS Triple power supply with power distribution (optional)
  • Non follow-up control (optional)
  • RPM, pitch and steering indication (optional)
  • Emergency Telegraph (optional)


PCS Control Lever

The stylish Control Lever can be supplied in various configurations to suit best each application. Chrome and black coated aluminium versions in different shapes are available for this purpose. The symmetric black coated aluminium version is applied for propulsion and tunnel thruster  applications. The chrome version is available in a symmetric and non-symmetric version. The symmetric version is mainly used for tunnel thruster and the non-symmetric version is used for propulsion applications. A Control Lever is available in a single and dual configuration with same  dimensions. Control Levers for steerable thrusters are equipped with a 360 degrees rotatable steering lever. PCS Control Levers are as well available with ‘electric shaft’ in order to synchronize all Control Levers.


PCS Operator Panel

PCS Operator Panels are equipped with a user friendly touchscreen for intuitive operation and monitoring of propulsion plant. Operator Panels have a built-in PLC controller, I/O interface and Graphic Engine. This allows to adapt Mega-Guard PCS for all types of propulsion applications. PCS Operator Panels are connected to other Operator Panels and to the PCS Controller through Ethernet wired in a loop for redundancy. Different type of Operator Panels are available to suit different applications for the following market segments:

  • Commercial ships : 5.7” touchscreen with separate Control Lever
  • Yachts and small ships : 2.5” touchscreen and integrated Control Lever.
  • Navy ships and mega yachts : 8” touchscreen with separate Control Lever.

Full glass versions are available to suit yacht and mega yacht applications.


PCS Controller

The PCS Controller consist of a compact PLC controller and one or two I/O modules depending on the application requirements. Two PCS Controllers are used in case of a steerable thruster; one for thrust and one for steering. The PCS Controller is connected to the PCS Operator Panels  through Ethernet wired in a loop. In addition, spare Ethernet ports are available to connect the Mega-Guard PCS to other Mega-Guard systems such as Mega-Guard Vessel Management System and Mega-Guard Dynamic Positioning System. Mega-Guard PCS can also communicate with thrusters and engines through Ethernet and various serial protocols. One I/O module is sufficient for standard applications regarding FPP and CPP thrusters. An additional I/O module is needed in case engine control, non follow-up and/or special operator modes are required. The PCS Controller is mounted on a TS35 DIN rail and installed in a bulkhead mounted PCS Cabinet or in bridge or ECR console.

PCS for commercial vessels, mega yachts and navy ships

PCS for yachts and small vessels

PCS for steerable thruster

PCS for tunnel thruster

Power Management System

Power Management System

The Mega-Guard Power Management System (PMS) is an advanced system for full automation of power plants


The Mega-Guard Power Management System (PMS) is an advanced system for full automation of power plant, including power management, diesel engine control, generator control, synchronizing, generator protection and optional diesel engine safety system. Each generator set is equipped with its own independent and autonomous PMS system. This ensures the highest degree of reliability and availability. The Mega-Guard PMS is supplied as a complete product and no additional components are needed for automation of a low voltage switchboard up to 690VAC.

The Mega-Guard PMS is operated through a user friendly touchscreen (5,7″ or 8″) for intuitive operation and monitoring of power plant.

Reliable operation is guaranteed by 6 operator pushbuttons for essential functions.  All essential power plant parameters are displayed on the touchscreen. The touchscreen supports swiping in between pages and activating sub menus with the touch of a finger.

Mega-Guard PMS is built-up with the following three items for each generator:

  • PMS Operator Panel for flush panel mounting in switchboard
  • PMS Controller for DIN rail mounting inside switchboard
  • I/O Cable interconnecting the PMS Operator Panel and the PMS Controller


Both the PMS Operator Panel and the PMS Controller are equipped with a powerful ARM microprocessor for independent function execution.



The Mega-Guard PMS can be configured for a mixture of the following applications:

  • diesel generator
  • shaft generator
  • automatic bus tie breaker
  • emergency generator
  • shore connection

Mega-Guard PMS provides for auto starting, synchronisation and load sharing functions. Metering functions include 3 phase voltage, current, frequency and power measurement, calculation of power factor and running hours. Diesel engine, generator and circuit breaker are controlled and monitored by Mega-Guard PMS.  Safety functions are executed in accordance with the applicable ANSI standard (see PMS protection function table).

Other functions include black-out start, consumer enable when enough power and preferent tripping in case not enough power available.

Mega-Guard PMS includes a PLC programming option and graphic editor which is not needed for most switchboard applications. Special applications can be programmed  with the built-in and optional
PLC logic. The PLC logic is in accordance with the IEC61131 standard.

Mega-Guard PMS can be extended with additional modules to realize following functions:

  • Safety system for diesel engine
  • Differential tripping
  • Check synchronizer with back-up
  • measurement of kW, V, A, Hz and Cos φ
  • Analog control for frequency and voltage
  • Additional Controllers for user
  • functionality (requires PLC programming (option)

Installation and commissioning of Mega-Guard PMS can be executed by switchboard builder and does not require special skills. The technician can easily set switchboard and power plant parameters in the Mega-Guard PMS with the user friendly PMS Operator Panel with touchscreen.  Parameters such as generator power, number of generators,  bus tie breaker, busbar nominal voltage, alarm limits, type of generator etc. can easily be entered in the menu driven operator interface.

PMS Operator Panel

The PMS Operator Panel is supplied in a compact DIN compatible housing for flush panel mounting in switchboard.
The PMS Operator Panel is equipped with a user friendly touchscreen and a powerful ARM microprocessor which executes the power management functions and optional PLC logic.

The PMS Operator Panel  is available in three versions for the following market segments:

  • Commercial ships : 5.7” touchscreen and metal frame with 6 pushbuttons
  • Mega yachts : 5.7” touchscreen with full glass front
  • Navy ships : 8” touchscreen and metal frame with 6 pushbuttons

The colour touch screen continuously displays metering values (kW, Hz, V, A, pf, kVAr), circuit breaker status, standby generator number and alarms. Operator mode selection can be executed with pushbuttons or the touchscreen.  The rear side of the PMS Operator Panel is equipped with detachable terminal strips, four  Ethernet ports and a USB port. Communication between Mega-Guard PMS systems takes place via Ethernet wired in a loop and occupies two Ethernet ports on each PMS Operator Panel. The two remaining Ethernet ports can be used for connection to e.g. an external monitoring system and/or to the diesel engine. RS485 and CAN bus communication are supported as well. The USB port is used for a memory stick to upload or download an application program. Terminal strips are available to connect the 24VDC power supply and a number of inputs and outputs. The switchboard can be configured in such a way that installation of separate gauges is not required with Mega-Guard PMS.

PMS Controller

The PMS Controller is installed on a TS35 DIN rail inside main switchboard at each generator section. I/O signals from generator, busbar, circuit breaker and engine are directly connected to this Controller. The PMS Controller is equipped with a powerful ARM microprocessor executing  metering, safety and generator control functions. The PMS Controller can also be delivered as an independent check synchronizer.

The PMS Controller has the following inputs and outputs:

  • 3 phase busbar voltage (0~690VAC)
  • 3 phase generator voltage (0~690VAC)
  • 3 phase generator current (0~5A)
  • 14 relay outputs
  • 14 digital inputs

The PMS Controller is connected to the PMS Operator Panel via an I/O Cable. The I/O Cable is standard available in two lengths: 3m and 5m.

PMS Configuration

The PMS can be configured for the particular application via the touch screen or through an external PC connected with Ethernet communication link. All power plant functions, parameters, inputs and outputs can be configured with a menu driven and user friendly operator interface. This can  asily be executed by switchboard builder as no specific programming knowledge is required. Unauthorized access is prohibited by password protection. The following configuration pages are available:

  • main settings
  • start/stop
  • auto start/stop
  • alarm limits
  • CB open/close
  • consumer
  • I/O
  • load sharing
  • preferential group

A back-up of the configuration can be made on an external PC or on a USB stick connected to the USB port.

Navigation Light Control

Navigation Light Control

The Mega-Guard Navigation Light Control System (NLCS) controls up to 48 navigation lamps.


The Mega-Guard Navigation Light Control System (NLCS) controls up to 48 navigation lamps. The system has two outputs for each navigation lamp: a Main lamp output and a Spare lamp output. Each navigation lamp has its own on/off pushbutton. A number of navigation lamps can be grouped together (e.g. free sailing, towing) for simultaneous on/off control.

The Mega-Guard Navigation Light Control System supports the following lamp types:

  • LED lamps; 19~32VDC; maximum 60W.
  • Bulb lamps; 19~32VDC; maximum 60W.

The lamps are continuously monitored for failures and the Spare lamp is automatically activated in case of failure of the Main lamp.

The Navigation Light Control System is connected to a main and back-up supply and switches automatically to the back-up supply in case of failure of the main supply.

System lay-out

The Mega-Guard Navigation Light Control System consists of three items:

Navigation Light Operator Panel
Two versions are available:

  • 8.4” TFT colour display with 12 pushbuttons, Size: 240x160mm
  • Panel with 12 pushbuttons/lamps and navigation mast, Size: 144x144mm

Navigation Light I/O Module
Size: 127x198x29mm (WxHxD) for Din rail mounting

I/O Cable 
In between Nav. Light Operator Panel and Nav. Light I/O Module with a length of 3 or 5 meter

The Navigation Light Operator Panel is flush mounted in bridge console.

The Navigation Light I/O Module is DIN rail mounted inside bridge console and the navigation lamps and power supplies are directly connected to this module. In  addition, the module is equipped with manual on/off switches for Main and Spare lamps. The I/O Module should be mounted in such a way that it can be reached without using tools in order to fulfill class requirements.

The I/O Cable inter-connects the Navigation Light Operator Panel and the Navigation Light I/O Module.

Nav. Light Operator Panel functions:

  • Pushbuttons for individual lamp control
  • Pushbuttons for group lamp control (under way, NUC, RAM, anchor etc.)
  • System on and fault indication
  • Main and back-up supply indication
  • Dimming pushbuttons
  • Installation mode pushbutton
  • USB port to load configuration from memory stick
  • Dimming pushbuttons
  • Ethernet port to connect to other Mega-Guard Operator Panels
  • Version with 8.4” TFT colour display with 12 pushbuttons:
    • Mimic page of vessel and navigation mast displayed on TFT
    • Supports up to 48 lamps with 4x Nav. Light I/O module
  • Version with 12 pushbuttons and navigation mast:
    • Text sheet for pushbutton descriptions
    • Supports up to 12 lamps with 1x Nav. Light I/O module

The Nav. Light I/O Module is equipped with:

  • 12 pcs navigation lamp Main output.
  • 12 pcs navigation lamp Spare output.
  • 12 pcs switch with 3 positions: Main lamp On, Remote, Spare lamp On.
  • In Remote position the navigation lamps are controlled by the Navigation Light Control System.
  • Main power supply input: 19~32VDC.
  • Back-up power supply input: 19~32VDC.
  • Power supply output: 19~32VDC which is connected to the Navigation Light Operator Panel.
  • I/O Bus connector to connect to I/O Cable.

IMO Colreg 72

The Mega-Guard Navigation Light Control System is compliant with IMO Colreg 72 and supports the following vessels:

  • 12-20 meter length
  • 20-50 meter length
  • More than 50 meter length
  • Towing and pushing
  • Double ended ferries Fishing
  • Fishing vessels
  • Dredging and underwater works

Lamp are supported with different visibility (2NM, 3NM, 5NM and 6NM) in accordance with Colreg 72 legislation. The following lamp types are available:

  • Port (red) and starboard (green) light with 112° angle
  • Stern light (white) with 135° angle
  • Masthead light (white) with 225° angle
  • Towing light (yellow) with 135° angle
  • Restricted Ability to Manoeuvre (RAM) with 181° angle
  • Not Under Command (NUC) with 181° angle
  • Allround light with 360° angle

Intergrated Navigation System

The Mega-Guard IBS integrates all bridge equipment and complies with the one man integrated bridge philosophy


The Mega-Guard Integrated Bridge System provides the following functions:


  • Integrated Navigation system
  • Miscellaneous Bridge Controls
  • Integrated Manoeuvring System

The Mega-Guard IBS integrates all bridge equipment and complies with the one man integrated bridge philosophy and has a full redundant lay-out according class rules LRS (IBS NAV1), DNV (NAUT-AW) and BV (SYS). The complete bridge is built-up with identical hardware and software components from the Mega-Guard product line.

Integrated Navigation System

The Mega-Guard Integrated Navigation System is based upon a minimum of three and a maximum of ten Operator Workstations. On each Operator Workstation the following functions are available:

  • ARPA X and S Band radar with chart overlay.
  • Conning including centralized alarm system and bridge watch alarm system.
  • ECDIS with radar overlay.
  • Alarm, monitoring and control

Each Mega-Guard Operator Workstation is equipped with a Marine Personal Computer, a 22″~26″ TFT colour display and a Trackball for easy operation. The Operator Workstations are inter-connected via a redundant Ethernet link. The Mega-Guard X and S Band antenna-transceivers are directly connected to the redundant Ethernet link as well. All navigation sensors are wired to the Operator Workstations in a redundant way.

The Mega-Guard ARPA X and S band radar are designed to comply with the applicable IMO and Solas rules for seagoing vessels. Two different sizes TFT colour widescreen displays are available a 26” (350mm radar image) and a 22” (300mm radar image). All Mega-Guard radars have as a standard ARPA function including ATA/EPA and AIS display functionality. The ARPA radar supports the chart overlay function (full chart, simple chart or no chart).

Navigation, manoeuvring and miscellaneous bridge controls

The Conning display has the following features

  • Navigation mode mimic and docking mode mimic. Display of: GPS, depth, wind/current, next way-point, heading, ROT, speed, engine RPM and rudder angle.
  • Centralized alarm system. Including prioritization into emergency alarms, distress alarms, primary alarms and secondary alarms.
  • Bridge watch alarm system for monitoring the well-being and awareness of the watchkeeper.

The ECDIS display has the following features:

  • In conformance with IMO A817 (19) resolution.
  • Chart information and chart information update.
  • Route monitoring and navigation planning.
  • Radar target overlay.
  • Grounding avoidance aid function.
  • Navigation log.
  • Chart data bases: S57 & ARCS.
  • Automatic navigation tracking/course changing/drift correction.
  • Navigation display function.

Integrated manoeuvring system

The Mega-Guard Integrated Manoeuvring System provides propulsion- and steering control functions. The Propulsion Control System fully automates the remote control on the bridge from the main propulsion engines, gearboxes and propellers. The Heading Control System automatically controls vessel’s heading by controlling the rudders or azimuth thrusters. Steering controllers with manual steering (FFU) and emergency steering (NFU) are integrated. The manoueuvring system can be extended with a Dynamic Positioning System with class DP3, DP2 or DP1.The PCS, HCS and DP Operator Panels are built-up with a 8.4”TFT colour display with 12 control pushbuttons. Operator mode selection and indicators (RPM, pitch, steering, heading, etc) are implemented on the 8.4”TFT. All components are linked together via a redundant Ethernet network.

Miscellaneous bridge controls

The Mega-Guard IBS also integrates common functions such as navigation lights, window wiper, horn control, pump control, windlass control, fire dampers, ventilation control, emergency control etc. These functions are implemented on 8.4” TFT’s with colour display and 12 control pushbuttons. All components are linked together via a redundant Ethernet network.