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| Design
and installation of main bearing monitoring systems for P&O
European Ferries... |
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existing 24 year old main bearing monitoring systems on three
sister ships had become increasingly unreliable and inaccurate,
contributing to machinery failure. Spares were also obsolete.
We were commissioned to replace the main bearing monitoring
units in the ECR whilst retaining the existing probes and
wiring.
An off the shelf system was sought but due to the unusual
probe characteristics i.e. negative temp co-efficient (NTC)
thermistors, this option was unavailable at acceptable cost.
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This
led us to designing our own proprietary main bearing monitoring
system, able to interface to the existing probes fitted.
The system was based upon software programmable sensor interface
modules for linearization and galvanic isolation and a class
approved Mitsubishi PLC for data display and alarm handling.
A colour graphical HMI (Human Machine Interface) was used for
presentation of bar graph style readouts and alarm screens.
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The
complete design, construction and class approval of the three
systems was carried out over an eight week period.
All of the documentation was submitted and approved by class
(Det
Norske Veritas).
Installation and testing was completed in less than one day
per ship. |
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The
system has been designed to interface to virtually any type
of probe/sensor and including Pt100, Thermocouple, Resistance,
Thermistors (NTC/PTC), Voltage, Current.
It is ideal for replacement of existing systems or for retrofitting. |
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