The BDMS consists out of 2 distance sensors type IW000184 mounted inside a special bracket to be installed inside the engine between crosshead slide ways facing the lower dead point of the crossheads, a cable gland for engine wall penetration to take out sensor signal lines and a connection box mounted outside at the engine side wall or the cable track if existing.

Between the connection boxes a power/bus cable is mounted connected at the engine front to a power and data transceiver box.

The indication and data storage unit is mounted either in the engine or in the control room and connected by a bus cable with the power and data transceiver box at the engine.

• Distance sensors type IW000184
  
  Mounted inside each compartment left and right hand side at lower dead point of the cross head measuring the distance to the crosshead as well as the splash oil temperature. Sensors have connectors with integrated LED´s to identify position and operation. They act as slave, calculate the distance in X.xx mm and measure the splash oil temperature in °C. Upon request from the indication unit (master), the data are transferred.
  


• Cable glands and connection boxes
  
  The engine wall must be penetrated and a cable gland inserted. The sensor cables connected to the main lube oil line in the compartment are taken out through the glands and connected inside the connection boxes. The boxes do not contain active electronic the function is to connect the sensors to the power/bus link installed between the boxes.
  


• Power- and data transceiver box
  
  This box installed on the engine supplies galvanic isolated 24V DC and act as transceiver station between sensors and indication unit. So the length of the data cable to the indication unit could be up to 1000 m
  


• Indication unit type MDA308
  
  The display in the indication unit presents the distance and splash oil temperature information of one compartment as left/right % bar graphs and °C oil temperature. The compartment number is visible in the centre. In case of a pre-warning or alarm situation of distance or splash oil temperature the compartment in question is indicated automatically and alarm relays are triggered. The indication unit acts as master and collects and analyses all sensor data. If necessary a pre-warning or an alarm relay is triggered
  


• Data storage:
  
  3 memories are available / Basic mm value storage after installation of the BDMS / Long term storage of distance and temperature / Event memory backed up by real time clock to ensure the correct logging of System failures, replacement of system parts or bearing replacement if necessary.
  
  Basic value storage is done by turning the engine 2revs ahead and 2revs astern storing the average value in X.xx mm per sensor
  Once a year this operation must be repeated and values to be stored
  
  Long term storage is done in the way that for 48hrs all data of all sensors are available including speed information.
  After this time one set of min/max data per sensor per 24hrs are available.
  
  After 6 month one set of min/max data per sensor per week.
  
  After 12 month one set of min/max data per sensor per month.
  
  Max. storage time 15 years.
  
  In case of an indication unit defect it is possible to remove the data memory and insert it into the replacement unit without data loss.
  

Technical Department Dr. E. Horn GmbH