VARIABLE SPEED DRIVES For Industrial Controls & Automation

27th - 28th March 2019 Mumbai & 29th - 30th March 2019 Bengaluru

Course Description

Course description for Variable Speed Drives For Industrial Controls & Automation

Course Introduction:
Rapid developments in the field of power electronics and advances in control technologies in the last 25 years have fast forwarded the architecture of a variable speed drive from a simple V/f drive to a modern field oriented vector control drive to achieve the most precise speed/ torque characteristics required for many stringent industrial applications. At the same time a drive is no longer a standalone equipment in a large industrial plant but a part of a networked automation system. A variable speed drive is thus an intelligent electronic device (IED) at the field level of an industrial automation system to take care of all aspects of motor operation such as protection ,data acquisition and control. A large range of industrial applications and environments with varied operational and control options requires serious diligence for
optimum solutions.
While these high tech drives have great performance features they are sensitive to noise , have limited tolerance for poor power quality, require clean and temperature controlled environment and require consideration of compatibility with the driven loads. Being non linear loads they are the major source of harmonic generation. The plant executives have to grapple with nuisances on a daily basis if adequate attention to these aspects of drives is lacking. 
Course Objectives:
The main thrust of this workshop is to impart the participants with the topologies of the modern drive systems and strengthen their understanding of the key fundamental aspects of the drive technology to enable them to (a) select the right sized drive for their application(b) opt for application oriented features(c )specify the environmental requirements(d) take care of appropriate installation needs(e) decide appropriate ancillary equipment for surge protection, harmonic suppression, line reactors etc (f)choose an appropriate communication protocol for interfacing the drive with plant automation system.
It is expected that the participants of this workshop will go back with confidence to be able to handle all aspects of drives.
For registration contact us on: +91-9619046105 or email us on: or

Training Agenda

Training agenda for Variable Speed Drives For Industrial Controls & Automation

1.   Introduction 
•    The need for variable speed drives 
•    Fundamental principles
•    Torque-speed curves for variable speed drives
•    Types of variable speed drives Electrical variable speed drive methods 
2.   3-phase AC induction motors 
•    Principles of operation  
•    The equivalent circuit 
•    Electrical and mechanical performance 
•    Motor acceleration  
•    Efficiency of electric motors  
•    Rating of AC induction motors Electric motor
•    Duty cycles Cooling and ventilation of electric motors (IC)
•    Motor selection
3.   Power electronic converters 
•    Power electronic rectifiers (AC/DC converters)
•    Single-phase square wave inverter 
•    Single-phase pulse width modulation (PWM) inverter  T
•    Three-phase inverter  Gate controlled power electronic devices  
•    Gate turn-off thyristor (GTO)
•    Field controlled thyristors (FCT) Power bipolar junction transistors(BJT)
•    Field effect transistor (FET) 
•    Insulated gate bipolar transistor (IGBT)
•    Comparison of power ratings and switching speed of gate controlled power electronic devices

Day one afternoon
4.   Control systems for AC variable speed drives 
•    The overall control system
•    Power supply to the control system 
•    The DC bus charging control system
•    The PWM rectifier for AC converters
•    Variable speed drive control loops Open-loop control Closed-loop control 
•    Vector control for AC drives - space vector modulation
•    V/f sensorless flux-vector drives (open loop vector) 
•    Closed-loop field oriented vector drives 
5.   Selection of AC converters
•    The basic selection procedure 
•    The loadability of converter fed squirrel cage motors 
•    Operation in the constant power region 
•    The nature of the machine load 
•    The load torque  Variable torque machine loads 
•    Constant torque machine loads 
•    The speed range  
•    The inertia of the machine load  
•    The requirements for starting 
•    The requirements for stopping
•    Motor over-flux braking 
•    Dynamic braking 
•    Regenerative braking 
•    Control of speed, torque and accuracy 
•    Selecting the correct size of motor and converter
•    Summary of the selection procedures 
•    An example of a selection calculation/exercises

Day two forenoon
6.   Protection of AC converters and motors 
•    AC frequency converter protection circuits 
•    AC and DC under-voltage protection 
•    AC and DC bus over-voltage protection
•    Output over-current protection
•    Output earthfault protection
•    Heat-sink over-temperature protection  
•    Motor thermal overload protection 
•    Overall protection and diagnostics  
•    Operator information and fault diagnostics
•    Electric motor protection Thermal overload protection – current sensors 
•    Thermal overload protection – direct temperature sensing
7.   Electromagnetic compatibility (EMC) 
•    The sources of electromagnetic interference
•    Harmonics generated on the supply side of AC converters 
•    Analysis of the harmonic distortion
•    Effects of harmonics on other equipment Acceptable levels of distortion in the mains supply system 
•    Methods of reducing harmonic voltages in the power supply 
•    Power factor and displacement factor 
•    Voltages and current on the motor side of PWM inverters 
•    Effect of the high PWM switching frequency on long motor cables 
•    Selection of PWM switching frequency
•    High rates of rise of voltage (dv/dt) at inverter output
•    Protection of motors against high PWM switching frequency 
•    EMI (or RFI) filters for PWM inverters 
8.   Data Communication Requirements  
•    Options for different communication media
•    Suitability of protocols and its relevant standards 
•    RS-485/Modbus/Ethernet/DNP3/IEC 61850 48

Day two afternoon
9.   Installation, commissioning and maintenance
•    General installation and environmental requirements  
•    General safety recommendations
•    Hazardous areas Environmental conditions for installation  
•    Power supply connections and earthing requirements
•    Power supply cables 
•    Cables between converter and motor
•    Control cables Earthing requirements 
•    Common cabling errors
10. Commissioning
•    Selecting the correct application settings 
•    Selecting the correct parameter settings
11. VSD Applications
•    Energy saving applications
•    Material handling
•    Conveyor systems
•    Applications in oil and gas industry
For registration contact us on: +91-9619046105 or email us on: or

Course Director

Mr. Ratan Mathur An astute electrical engineer with more than 40 years of experience in projects, automation, electrical safety audits and training. Worked with Siemens India for the first 17 years and thereafter 3 years with Crompton Greaves. Subsequently ran an own set up as system integrator of Siemens. His core strength comes from exposure to a very wide but synergetic facets of electrical engineering applications such as Power and control systems, Automation and instrumentation, Energy efficiency, Electrical safety etc. in a variety of industries such as steel, paper cement, petrochem engg. & manufacturing, textile and synthetic fibre, food etc. The multi dimensional experience provides an ideal platform to easily interface with audiences from almost any industry on almost all major topics of interest in the field of electrical engineering applications. Certified Energy Auditor Exam, 2005, Bureau of Energy Efficiency, New Delhi, Ministry of Power Govt. of India Work experience ( Current Status) Member NSCI ( National Safety Council of India) expert panel: conducted safety audits at several plants including NTPC's 3250MW super Thermal Power station at Vindhyachal, Orissa Power Generating Company's 2400MW Thermal Plant, HOCL Kochi, 220/66KV EHV substations of Maharashtra State Elect. Transmission Co, 300MW Hydro electric power station at Uttarakhand, Tata Motor plant at Uttarakhand, HPCL refinery at Vizag, Vedanta aluminium refinery (now SESA sterlite), Hindustan Zinc Udaipur, Apollo Tyres Vadodara, Tata steel Jamshedpur, Bokaro steel etc. NSCI Faculty member: Conducted training programs on electrical safety, workshops at Suzuki power train at Gurgaon nr. New Delhi,Cummins Engines offices at Delhi, Calcutta, Pune and Banglore, Power transmission corpn of Uttarakhand at Dehradun, Hindustan Petroleum Corpn Ltd. New Bombay, Sesa Goa at Goa,. Godrej Industries Mumbai
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