Commercial Marine Shaft Power Meter Handbook
12Pages

DATUM ELECTRONICS COMMERCIAL MARINE TORSION METER HANDBOOK

DATUM ELECTRONICS COMMERCIAL MARINE TORSION METER HANDBOOK 2 CMTM SYSTEM SPECIFICATION 3 CMTM system performance and benefits 3 Standard system overview 3 SYSTEM COMPONENT INFORMATION 4 Single point stator 5 How is torsion meter calibrated? 8 Negative displays of torque and power? 8 Torque is shown when there's no RPM? 8 Marine Control Display CMTM SYSTEM CHECKS 10 Verifying torque output 10 Altering system calibration and settings 10 SYSTEM WIRING & DRAWINGS 11

DATUM ELECTRONICS COMMERCIAL MARINE TORSION METER HANDBOOK 3 DATUM ELECTRONICS COMMERCIAL MARINE TORSION METER HANDBOOK 3 CMTM OVERVIEW SYSTEM SPECIFICATIONS System design The Commercial Marine Torsion Meter, CMTM, system continually measures on shaft torque (kNm), speed (RPM) and power (kW). The Commercial Torsion Meter Systems have been developed to meet the requirements of the Commercial Marine customers to provide ongoing power monitoring data on ships including; Propulsion, Thruster and even Generator Shafts. CMTM system performancec and benefits: Simple and Easy to install Accurate -...

DATUM ELECTRONICS COMMERCIAL MARINE TORSION METER HANDBOOK The CMTM system can also be supplied with the extra 7 inch ECR display (Diagram 2): ROTOR BELT (Diagrams 5) SYSTEM COMPONENT INFORMATION TRANSMITTER (Diagrams 3-4) Features: Modular belt design made up of individual links IP68 rated design Powers the on shaft Transmitter Diagram No. 3 Features: Powered from Rotor belt (5V) IP 68 rated 2 status LED’s for easy system diagnosis Transmits 2 channels of strain (optimal thrust) 2.4Ghz transmission Removable cover to access 2 x strain channels and rotor band power connection Acts as strain...

DATUM ELECTRONICS COMMERCIAL MARINE TORSION METER HANDBOOK 5 Features: IP 68 Rated Inductively powers the on shaft Rotor Belt Receives data from the on shaft Transmitter Contains the rpm speed sensor to measure 1 pulse per revolution Features 2 LED’s for simple system diagnosis Has a single cable output (not shown) for power and RS485 serial data to the marine controller Powered from marine controller (24VDC) Features: IP 68 Rated enclosure Simple 4 Line display showing; Torque, Speed, Power and System Status Can be supplied on post or be bulk-head mounted Requires 110/240VAC power (see...

DATUM ELECTRONICS COMMERCIAL MARINE TORSION METER HANDBOOK 6 The Datum CMTM system is simple and easy to install. The engineer who installs it will have to ensure: 1. Continious power transmission between Stator and Rotor Belt 2. Accurate measurement of speed as 1 pulse per revolution between the ‘master’ link belt piece and the Stator Please see below drawings which illustrate best practice - please note that the Transmitter can be positioned either side of the Rotor Belt: DISTANCE BETWEEN THE ROTOR BELT STATOR POST TO BE ALIGNED STATOR £ & ROTOR BELT £

DATUM ELECTRONICS COMMERCIAL MARINE TORSION METER HANDBOOK 7 NOMINAL CONCENTRIC CLEARANCE BETWEEN ROTOR BELT AND STATOR OUTER FACE OF POST TO THE OUTER For more information on the installation of the system and how to align the CMTM please refer to the installation guide.

DATUM ELECTRONICS COMMERCIAL MARINE TORSION METER HANDBOOK 8 How is the torsion meter calibrated? The CMTM system receives the raw strain value (mV/V) from the strain gauges on shaft and mathematically calibrates this into torque (kNm). This is calculated using the following equation: Torque (Nm) * I6000 * Gauge Factor * (I + a) Diameter (mtrs)3 * n *Young's Modulus (Pa) The values appear to be changing very quickly on Marine Controller display? The Marine Controller has a 4 Line display which gives a simple indication of the Torque, Speed and Power and the system status. It will show live...

DATUM ELECTRONICS COMMERCIAL MARINE TORSION METER HANDBOOK 9 DATUM ELECTRONICS COMMERCIAL MARINE TORSION METER HANDBOOK 9 SYSTEM DIAGNOSIS BLUE FAST FLASH = Good data connection with on shaft transmitter The Datum CMTM features several simple indicators to help with system diagnosis: • 2 x LED’s on the Transmitter (Rotor) • 4 line display on the Marine Controller display BLUE SLOW FLASH = No connection with the on shaft transmitter GREEN = This will illuminate every time an RPM pulse is triggered from the Rotor master link TRANSMITTER LED’S (ROTOR) MARINE CONTROLLER DISPLAY & 7 INCH...

DATUM ELECTRONICS COMMERCIAL MARINE TORSION METER HANDBOOK 10 Please note that it is only possible to use the strain gauge simulator whilst the shaft is static as you will need to connect to the on shaft transmitter. To use the strain gauge simulator you will need to remove the access cover on the on shaft transmitter and unplug the connector from the primary gauge. The primary gauge connector is the furthest from the rotor belt connection (Diagram 4). Now connect the strain gauge simulator. You can then use the dial to select the different mV/V values in both clockwise (positive) and...

DATUM ELECTRONICS COMMERCIAL MARINE TORSION METER HANDBOOK SYSTEM WIRING AND DRAWINGS

DATUM ELECTRONICS COMMERCIAL MARINE TORSION METER HANDBOOK