CPP Propulsion Control System

The CPP Propulsion Control System (CPP) fully automates from bridge and control room the control of CPP thruster and main engine


CPP Operator Panel as installed on bridge and control roomThe Mega-Guard CPP Propulsion Control System (CPP) fully automates from bridge and control room the control of CPP thruster and main engine. The CPP thruster can be driven by electric or diesel motor. The  Mega-Guard CPP can be supplied for a single engine / single CPP thruster or for a dual engine / dual CPP thruster. Two engines on one shaft is supported as an option as well. The CPP Propulsion Control System fulfills the rules of the classification societies and includes, remote control, safety, pitch indication, RPM indication and a back-up pitch control system.

Operator Panels can be supplied for bridge fore, bridge aft, bridge wings and control room. Operator panels are equipped with a combined pitch and RPM  setting lever and a display to select various operator modes and to

indicate pitch, engine RPM, shaft RPM and motor load.

CPP Operator Panels on bridge and control room

Main components on each control position are (in case of a single engine and single CPP thruster):

  • Pitch and RPM setting lever
  • 8.4” TFT colour display equipped with pitch, engine RPM, shaft RPM and load indicators.
    In addition, the 8.4” TFT is equipped with 12 control pushbuttons and various other indicators including alarms
  • Including pushbuttons for dimming and take over (when applicable).
  • Emergency Stop pushbutton
  • Back-up control of pitch
  • Option: telegraph system

A VDR serial interface is provided on the bridge Operator Panel (NMEA0183 protocol). Two or more bridge panels are supplied in case of bridge fore and bridge aft. Dual wing indicators for pitch and shaft RPM, implemented on 5.7” TFT, are available as well. The wing panel can be extended with RPM/pitch setting lever and Emergency Stop pushbutton. Bumpless take over control is realized with line-up indication lamps on the 8.4” and 5.7" TFT colour displays or an electrical shaft (synchronization) between bridge levers can be supplied as an option.

CPP Operator Panel control functions

Pushbuttons are integrated on the Operator Panel with function indication on the 8.4" TFT colour display.

The following typical functions can be selected:

  • Start motor and stop motor
  • Combinator mode and individual mode selection
  • Constant RPM mode selection
  • Sailing and manoeuvring mode
  • Load trim setting (%)
  • Take over control from bridge to control room
  • Tandem mode selection
  • Dimming mode selection (bridge) or parameter mode selection (control room)

Back-up control of pitch

The non follow up back-up control is used as a back-up in case the remote control system fails. Typically the back-up control contains 3 pushbuttons on each control location:

  • Non follow-up control; in order to select this mode
  • Increase pitch to ahead
  • Decrease pitch to astern

CPP Control Cabinet

CPP dual pitch setting LeverThe CPP Control Cabinet is bulkhead mounted in control room.
The CPP Control Cabinet includes a remote control system, an indication system (pitch, engine RPM, shaft RPM, load etc), a back-up control system and a no break power supply with power distribution. The remote control system is built-up with a Control Processor and two I/O Modules:

  • II/O Module with 18 digital inputs and 18 relay outputs
  • I/O Module with 4 analog outputs and up to 20 free configurable I/O points (AI,AO,DI and DO)

Programming of the Mega-Guard CPP is in accordance with the IEC61131 standard. Field cables are connected to the terminal strips on the I/O Modules. The Control Processor also supports serial interfaces which are supplied in case the motor or drive provides a serial interface or in case a serial interface is required with AMS. Two power supplies need to be connected to the CPP Propulsion Control System:

  • 230VAC main supply
  • 24VDC back-up battery supply

All other components from the CPP Propulsion Control System are fed from the power distribution logic in the CPP Control Cabinet. The Operator Panels on bridge and control room are connected to the CPP Control Cabinet via redundant Ethernet connection.

CPP Local Cabinet

CPP mimic as shown on a 8,4The CPP Local Cabinet is bulkhead mounted (with vibration dampers) near the CPP hydraulics. The CPP Local Cabinet includes the following:

  • Dual indicator for pitch and shaft RPM or load indicator implemented on 5,7" TFT
  • Back-up control pushbutton for pitch
  • Option: telegraph reply panel

Option: Electric motor starter cabinet

A soft starter cabinet for the electric propulsion  motor can be provided as an option. Electric motors are supported from 250KW up to 3400KW with voltages up to 690VAC.

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Contact information

Praxis Automation Technology
Zijldijk 24A,
2352 AB Leiderdorp
The Netherlands

+31 (0)71 5255 353

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