Drive Solutions for the Global Mining Industry - Tmeic.com
Drive Solutions for the Global Mining Industry - Tmeic.com
Drive Solutions for the Global Mining Industry - Tmeic.com
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<strong>Drive</strong> Applications <strong>for</strong> Draglines, Shovels, Conveyors, Mills, and PumpsAC and DC variable frequency drives are used to control <strong>the</strong> speed of draglines, conveyors, mills, hoists and pumpsin <strong>the</strong> mining industry. The following pages describe four typical applications and present <strong>the</strong> reasons why electricaldrives were chosen.Application 1. Advanced Control <strong>for</strong> MG Set Draglines and ShovelsDC-EXX MG Set ControlThe DC-EXX is TMEIC’s motor generator control <strong>for</strong> miningexcavators. This control is a high-per<strong>for</strong>mance, innovative,hardware-software system built on proven technology andover 50 years of experience.The system is designed <strong>for</strong> multiple dc generators andmotors used in large machines. Common-bus dc rectifiersfeed IGBT (Insulated Gate Bipolar Transistors) field exciterregulators,while a single high-speed PLC provides precisecontrol and enables high excavator productivity.Overall Motor Generator Set System• Medium voltage ac power from<strong>the</strong> mine trail cable feeds MGset sync motors and auxiliarytrans<strong>for</strong>mer.Aux ac SupplyMain ac SupplyDiodeRectifierGenExciterGenExciterGenerator Field dc Bus• Each synchronous motor MG setpowers multiple dc generatorson a <strong>com</strong>mon shaft.• Diode ac-dc converters onauxiliary power create two 600volt <strong>com</strong>mon dc busses <strong>for</strong>generator and motor fieldsSync.MotorMotorExciterAux ac SupplyMG SetDiodeRectifierdcGenMotorExciterDCMotorShaftdcGenMotordcMotorTo o<strong>the</strong>r generatorsMotor Field dc BusDC-EXX FeaturesLatest Technology• Common Bus – allows field power sharing• Low harmonics of diode vs. thyristor converters• IGBT power switches vs. thyristors• Replace field circuit dc contactors with thyristorMore Control Features• <strong>Drive</strong> PLC sets limits, <strong>com</strong>munication, & operationmodes• PLC master has motion protection and drive settings• Complete control during LE (Excitation) stopSuperior Design• Current but proven technology• Fewer excitation trans<strong>for</strong>mers• Simpler drive internal controls• Small footprint• Lower total system costBenefitsImproved Per<strong>for</strong>mance• Smaller feed trans<strong>for</strong>mers and lower cost• Less heating & interference, smaller auxiliary trans<strong>for</strong>mer• Faster response, no cell state sensors, fewer devices• Less maintenance; same field circuit protection & brakingImproved Control• Simplified supervisory PLC system & real-time monitoring• Visible functionality <strong>for</strong> easier monitoring & maintenance• Faster motion stop while protecting motors & generatorsImproved Value• Long product life• Less space, simpler, lower cost MCC and ac feeds• Easier troubleshooting and setup• Better and smaller panel layout and maintenance• Better valuePage 4 of 24© 2011 TMEIC Corporation. All Rights Reserved.
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