Electric Vibration Balancer

Transcription

1 Nishishiba VIBRATION COMPENSATOR Marine & Offshore Equipment Electric Vibration Balancer

2 CONTENTS SUMMARY...1 PRINCIPLE...2 STANDARD DATA

3 SUMMARY GENERAL Nishishiba NISHISHIBA has been widely known as a special manufacture of marine electrical machinery in the world. Based on rich experience and satisfactory results, our products gain the confidence of extensive customers and bear an exceedingly large share in the market. FEATURE Wide range of vibratory force Adjusting the unbalanced weight, it is possible to change vibratory force widely. Space saving By adopting the Inverter control system, we reduced the number of parts and realized space-saving. High reliability and response The reliable Inverter enabled the response to be excellent. Retrofitting It is possible to install the electric vibration balancer for an existing ship. 1

4 PRINCIPLE Hull vibration by Two-cycle Low Speed Diesel Engine 1.Vibration Source In case of two-cycle low-speed diesel engine, the residual vertical unbalance moment will occur in spite of cylinders firing order. This moment will cause vibration with 2 times frequency of the main engine's rotational speed. 2. Abnormal Hull Vibration Resonance If frequency of this vibration accords with the natural frequency of hull, the abnormal vibration of hull may be generated by resonance phenomenon. 3. Principle of Electric Vibration Balancer unbalanced weight The two flywheels with same unbalanced weight are installed in electric vibration balancer and each flywheel rotates to opposite direction. It generates only vertical vibration. 4.Vibration Reduction by Electric Vibration Balancer Installation of Balancer The electric vibration balancer operates to detect rotation of the main engine and to generate vibration with an opposite phase angle of the hull vibration. This vibration counterbalances vibration of hull. 2

5 STANDARD STANDARD SPECIFICATION STANDARD SPECIFICATION MODEL NEBIV1 NEBIV2 NEBIV3 NEBIV4 1. GENERAL RULE AMBIENT TEMPERATURE/RELATIVELY HUMIDITY JIS, JEC, JEM 45 C / 95% or less 2. MACHINE NORMAL ROTATIONAL SPEED ROTATIONAL SPEED RANGE RATED(MAXIMUM) VIBRATORY FORCE VIBRATORY FORCE RANGE MOTOR RATED POWER MOTOR SPEC. MAXIMUM FOLLOWER SPEED MINIMUM STARTING SPEED STOP SPEED ACCURACY at STEADY STATE FOLLOWER PERFORMANCE 145min min -1 75kN130kN 41step from 60% to 100% of rated(max.) vibratory force 180min min -1 58kN154kN 27step from 60% to 100% of rated(max.) vibratory force 180min min min min -1 38kN100kN 23.2kN111kN 23step from 50% to 100% of 19step from 50% to 100% of rated(max.) vibratory force rated(max.) vibratory force 15kW 11kW 11kW 7.5kW HORIZONTAL Class155(F)IP44CONT.400V-58.5Hz 1.1times of normal rotational speed 0.8time of normal rotational speed 0.95time of starting speed Phase angle difference within ±10 deg. In case that main engine rotational speed varies within ±2.5 min -1 /sec, phase angle difference shall be within ±25deg. 3. CONTROL PANEL ENCLOSURE COOL TYPE INPUT POWER CONTROL SPEC. OUTGOING CABLE 4. BRAKE RESISTOR ENCLOSURE RATED POWER PROTECTED DRIP-PROOF IP22 FORCED AIR VENTILATION AC440V 60Hz 3phase Simusoidal PWM Lower part coaming PROTECTED DRIP-PROOF IP22 5.5kW 3

6 DATA APPLICATION NEBIV1 NEBIV2 NEBIV3 NEBIV Type NEBIV1 NEBIV2 NEBIV3 NEBIV4 POINT A 75kN at 120min -1 58kN at 160min -1 38kN at 160min kN at 160min -1 RATED VIBRATORY FORCE POINT B 110kN at 145min kN at 180min -1 49kN at 180min kN at 180min -1 POINT C 130kN at 160min kN at 260min kN at 260min kN at 350min -1 DIMENSIONS AND MASS Fig.1 MACHINE (NEBIV1,NEBIV2,NEBIV3) CONTROL PANEL G W MASS:150kg R R R Fig.2 MACHINE (NEBIV4) BRAKE RESISTOR 600 MASS:30kg Type NEBIV1 NEBIV2 NEBIV3 NEBIV4 L MACHINE W SPACE FOR REMOVING THE DRIVING MOTOR DIMENSION MAINTENANCE SPACE H SPACE FOR REMOVING THE UPPER CASING Fig.1 Fig.1 Fig.1 Fig.2 4

7 CONFIGURATION DIAGRAM SOURCE AC440V 60Hz 3Ø MCCB <MSB> DS MC CONTROL SOURCE <CONTROL PANEL> DCL A SPEED REFERENCE SIGNAL CONTROL MODULE PLC UNIT Nishishiba supply INVERTER UNIT GEAR WEIGHT IM SPEED PG DETECTOR (ENCORDER) ELECTRIC VIBRATION BALANCER BRAKE RESISTOR <PBR> JUNCTION BOX PULSE PICKUP SENSOR ENGINE TELEGRAPH TURNING GEAR Confirmation of specification for quotation 1 ) General information for the project. Owner name Vessel type Classification 2 ) Main engine information Maker type MCR power (kw) MCR speed (min -1 ) 3 ) Request maximum vibratory force of the electric balancer (kn) ) If in case of no deta the vibratory force, Please inform us following. a ) Unbalance moment of main engine (Vertical 2nd order-m2v): (knm) b ) The length between the electric balancer and main engine (m) 5 ) Request operating range of the electric balancer : Range of main engine speed (for Automatic start/stop) from to (min -1 ) 5

8 HEAD OFFICE, FACTORY & BRANCHES Head Office & Factory 1000 Hamada, Aboshi-ku, Himeji , Japan. Phone: Himeji Facsimile: Tokyo Branch Solid Square West Tower, 580 Horikawa-cho, Saiwai-ku, Kawasaki , Japan. Phone: Kawasaki Facsimile: Osaka Branch 29th FI., Umeda Sky Building West Tower, 1-30, Oyodonaka 1-chome, Kita-ku, Osaka , Japan. Phone: Osaka Facsimile: Hiroshima Branch Grand Building Otemachi, 11-2, Otemachi 2-chome, Naka-ku, Hiroshima , Japan. Phone: Hiroshima Facsimile: Fukuoka Branch Toshiba Fukuoka Building, 4-1, Nagahama 2-chome, Chuo-ku, Fukuoka , Japan. Phone: Fukuoka Facsimile: Safety Precautions Operators should read the INSTRUCTION MANUAL before starting operation on safe use of the product. The data given in this catalogue are subject to change without notice. OM S