vacon ac drives for marine and offshore - VEM motors Finland Oy

.dwgX6F13B+B+, B-U1A1F21L1,1L2,1L3R+ R-F14F4A17A18A19K112L1,2L2,2L3X1E2T6X4X3X1X0Torpoint chain ferriesRolls-Royce MES60494A12L1,2L2,2L31L1,1L2,1L3U1B+, B-U, V, WL4Lay-out2pcs. CH72 motor unit2pcs, CH 5 brake unitHeat exchangerT7T6F4X3MC25U11U1A1Y.Koivisto 13.01.2004E2A11L1,1L2,1L32L1,2L2,2L3U1B+, B-U, V, WL4&F13U1A1B+B+, B-F21L1,1L2,1L3R+ R-F14F4Til.toimittanakojeK112L1,2L2,2L3X1E2T6=+system integrator makes complete systemsThe system integrator takes the total responsibility of the complete system. Vacon’sprofessionals and their know-how are at the system integrator’s disposal from beginningto end.Total responsibility of the system integrator• Perform harmonic calculations• Ensure success in EMC issues• Perform short circuit calculations• Succeed in black-out prevention• Co-operation with automation system• Control of power management system• Ensure good engineering• Provide documentation and trainingX5 X6K1,F8,9,10, K2139601230 1500 1230V1-5 X2V1 X2X1 X2Heat exchangersee drawing xxxF12, K21,K22E2 X1E2 X1E2 X1F12, K21,K22X1 V1 X2X5 X6K1,F8,9, 22, K21X0 X1 V1-5 X2 X3F10039 301-81 Fcase: all-electric tanker specialityThe design goal: to build silent coastal tankers that can discharge the cargo in the middle ofresidential areas at night. The solution: an eletrical main propulsion system which providesextremely low noise levels as there are no large low-speed diesel engines that can be heardat long distance. The same technology was applied to four similar vessels belonging to thesame series.M/S Speciality• 2 x 900 kW main propulsion drives• 350 kW bow thruster drive• 6 x 150 kW cargo pump drives• 3 x 52 kW drives for slop/ballast pumpsCharacteristic of these oil product tankers is the requirementof the lowest possible noise level. Electric motors arequiet compared to their hydraulic alternative. The usefulnessand efficiency of the variable speed control of a fixedblade propeller is clearly better than the fixed speed with avariable angle. Additionally, the fixed speed propeller alwaysruns at the maximum speed, which causes more mechanicalnoise even at partial loads. In these tankers, all propellersare equipped with a fixed space angle (CP) to ensure asufficient noise performance. The main goal is to avoid noisefrom hydraulic machinery when discharching the cargo. Thisis a clear advantage for the neighbourhood, especially atnight time.An electrical main propulsion drive offers numerous importantbenefits over a diesel-engine direct-driven propeller. Forexample, the power generation plant can be optimized, consistingof several smaller units, thus reducing the emissionsof environmentally harmful gases. The motor speed of thetankers´ main propulsion will be controlled by two 900 kWliquid-cooled Vacon NX drives. Speed control also decreasesthe electromechanical stress for the electrical system andprovides flexibility in power generation and distribution. Alltogether four similar vessels belong to the same series.7