SlideShare a Scribd company logo
1 of 46
Download to read offline
Understanding “VFD
Variable Frequency Drives
Xubair khan
19092
(BE)-Electronics
Contents
• Introduction
• Block Diagram
• Building blocks
• Modes of operation
• VFD Parameters
• Braking Technique
• Start/Stop Command methods
Introduction
– A Variable Frequency Drive (VFD) is a type of motor
controller that drives an electric motor by varying the
frequency and voltage supplied to the electric motor.
Other names for a VFD are variable speed drive,
adjustable speed drive, adjustable frequency drive,
or an AC drive.
– Frequency (or hertz) is directly related to the motor’s
speed (RPMs)
Energy Usage
Electric Motor Facts
• Electric motors account for more than two-
thirds of all energy used in industry
• 63% of the energy consumed is linked to air &
liquid flow
• A typical 50HP industrial motor, with an
efficiency of 90%, costs over $25,000 to operate
continuously over a year.
– Standard motors are constant speed and when they
are energized they run at a 100% speed no matter
the load.
– What if the speed of the driven machine (Fan, Pump)
is to be changed?
What is a VFD?
– Variable Frequency Drive (VFD)
– Equation of motor speed
Speed= 120 x f /P
• P=No. of poles
• F=Line Frequency
– How to change line frequency?
Constant
=50Hz
Block Diagram
VFD Fundamentals
50 Hz Power
Electrical Energy
ABB
Variable Frequency
To
Motor
VFD
RECTIFIER
(AC - DC)
INVERTER
(DC - AC)
AC DC AC
VFD
Variable Frequency50 Hz
VFD Explored
 First, the Converter (usually a diode rectifier) converts three-phase AC power to DC
power.
 Next, the DC Bus stores and filters the DC power in a large bank of capacitors.
 Last, the Inverter (usually a set of six IGBTs) switches or inverts the DC power in a
Pulse Width Modulated (PWM) AC waveform to the motor.
Rectifier
• Basic Building blocks of rectification
– Diodes (Uncontrolled)
Thyristors
• Controlled
• Output voltage can be controlled
Gate Pulse
Conduction
after Gate
Pulse
Three Phase Rectifiers
Output Voltage
• Output Voltage (dc) =
3× 3×𝑉𝑚
∏
x cos 𝐴
–Vm=Peak Value of voltage
–A= Firing Angle
• Firing at zero gives maximum output dc
voltage
Is it a perfect Direct Current?
• Conversion of AC into DC a perfect process?
– Ripples
• How to eliminate the ripples?
– Filters
DC bus in VFD
Inverter Action
• Switching DC voltage ON and OFF will make it
AC
• Filtered output from DC bus is sent to inverter
in VFD
RECTIFIER
Positive
DC Bus
Negative
DC Bus
+
-
INVERTER
How switching can convert DC into AC?
RECTIFIER
Positive
DC Bus
Negative
DC Bus
+
-
INVERTER
RECTIFIER
Positive
DC Bus
Negative
DC Bus
+
-
INVERTER
RECTIFIER
Positive
DC Bus
Negative
DC Bus
+
-
INVERTER
RECTIFIER
Positive
DC Bus
Negative
DC Bus
+
-
INVERTER
Pulse width modulation
• Such a waveform is not acceptable
– Nowhere near Sine wave
• Contains harmonics
– Multiples of fundamentals
• Solution
– Pulse width modulation
RECTIFIER
Positive
DC Bus
Negative
DC Bus
+
-
INVERTER
How Often You Switch From Positive
Pulses To Negative Pulses Determines
The Frequency Of The Waveform
Frequency
Voltage
Area Under the Curve
VFD Control Mode
• Scalar mode
• Vector mode
V/F Control Mode
• Scalar mode
• Drive is unaware of what is happening in the motor
Example:
• A 400V scalar drive is told to run a 400V, 50 Hz motor at 50%
speed Following V/F pattern, Voltage applied by the drive will
also be half.
• Perfect when at no load.
• After loading, motor will run at less than 50% speed
• Drive is unaware of it
Solution
Vector
Control
MotorDrive
Speed setting=50% Speed at no load=50%
Load increase
MotorDrive
Speed setting=50% Speed=40%
No idea what
is happening
Vector Control Mode
• Vector control with sensor
– Feedback through encoder
– Better speed regulations up to 0.01%
– Faster response to load variations
MotorDrive
Feedback
Encodersensor
Drive
INC/DEC
Speed Accd
Fb ..
Vector Control Mode
VFD input Parameters
• Max./Base frequency setting
• Motor rated output
• Motor rated voltage
• Motor rated current
VFD input Parameters
• Frequency Reference setting methods
• Stop Command method
• Start frequency
• Stop frequency (DC Braking starts)
• Torque Boost
Frequency Reference Setting Methods
• Potentiometer
• 0-10V input voltage
• 4-20(mA)
Frequency Reference Setting through Potentiometer
Min
Max
Min Max
Frequency
Main Control Panel
Potentiometer
VFD drives ……….
Stop Command methods
• Coast to stop
• Ramp to stop
Coast to stop
Coast to
Stop
Frequency
Run Command
Motor speed
Command
is removed
Ramp to stop
Frequency
Run Command Command
is removed
DC Brake
Ramp to
Stop
Auto Tuning
• Drive familiarizing itself with motor
VFD here I am M
Auto Tuning
MotorDrive
Start of Auto tuning
Primary resistanceLeakage reactanceDC Brake Voltage
Torque Boost
Voltage
Slip compensation
DC Injection Braking
• No mechanical Contact
• DC is applied at the stator winding
• DC causes stator to be become a magnet with
constant field
• A voltage is induced inside the rotor causing current
to flow
• According to Lens’s law, this current will cause rotor
to stop
Resistive Braking
Dynamic Braking
Electrical Energy
DiscardUtilize
Resistive
Elevators
Regenerative
Electric grid
Braking resistor
VFD
Braking
Unit
Thankyou…….
Engineering garage v=ir

More Related Content

What's hot

Variable frequency drives
Variable frequency drivesVariable frequency drives
Variable frequency drivesNaveen Sihag
 
Variable Frequency Drives
Variable Frequency DrivesVariable Frequency Drives
Variable Frequency DrivesSaqib Saeed
 
Variable frequency drives for industrial applications
Variable frequency drives for industrial applicationsVariable frequency drives for industrial applications
Variable frequency drives for industrial applicationsNaila Syed
 
variable frequency drive
variable frequency drivevariable frequency drive
variable frequency driverushi1234rap
 
variable frequency drive (VFD) installation
variable frequency drive (VFD) installationvariable frequency drive (VFD) installation
variable frequency drive (VFD) installationSakshi Vashist
 
VFD Basics.pptx
VFD Basics.pptxVFD Basics.pptx
VFD Basics.pptxalagu20
 
ABB ACS 800 SERIES VFD TRAINNING GUIDE BY DEEPAK GORAI
ABB ACS 800 SERIES VFD TRAINNING GUIDE BY DEEPAK GORAIABB ACS 800 SERIES VFD TRAINNING GUIDE BY DEEPAK GORAI
ABB ACS 800 SERIES VFD TRAINNING GUIDE BY DEEPAK GORAIDEEPAK GORAI
 
PWM inverter fed VFD
PWM inverter fed VFDPWM inverter fed VFD
PWM inverter fed VFDMayank Velani
 
Synchronous motor drive
Synchronous motor driveSynchronous motor drive
Synchronous motor driveGuru Moorthi
 
Synchronous machines
Synchronous machinesSynchronous machines
Synchronous machinesAnu71
 
Variable frequency drives (vfd)
Variable frequency drives (vfd)Variable frequency drives (vfd)
Variable frequency drives (vfd)Ujjwal Choubey
 

What's hot (20)

Variable frequency drives
Variable frequency drivesVariable frequency drives
Variable frequency drives
 
Vfd
VfdVfd
Vfd
 
Variable Frequency Drives
Variable Frequency DrivesVariable Frequency Drives
Variable Frequency Drives
 
Variable frequency drives for industrial applications
Variable frequency drives for industrial applicationsVariable frequency drives for industrial applications
Variable frequency drives for industrial applications
 
My ppt vfd
My ppt vfdMy ppt vfd
My ppt vfd
 
variable frequency drive
variable frequency drivevariable frequency drive
variable frequency drive
 
variable frequency drive (VFD) installation
variable frequency drive (VFD) installationvariable frequency drive (VFD) installation
variable frequency drive (VFD) installation
 
Vfd theory
Vfd theoryVfd theory
Vfd theory
 
Vfd
VfdVfd
Vfd
 
Motor drives
Motor drivesMotor drives
Motor drives
 
VFD Basics.pptx
VFD Basics.pptxVFD Basics.pptx
VFD Basics.pptx
 
ABB ACS 800 SERIES VFD TRAINNING GUIDE BY DEEPAK GORAI
ABB ACS 800 SERIES VFD TRAINNING GUIDE BY DEEPAK GORAIABB ACS 800 SERIES VFD TRAINNING GUIDE BY DEEPAK GORAI
ABB ACS 800 SERIES VFD TRAINNING GUIDE BY DEEPAK GORAI
 
PWM inverter fed VFD
PWM inverter fed VFDPWM inverter fed VFD
PWM inverter fed VFD
 
Motor.ppt
Motor.pptMotor.ppt
Motor.ppt
 
Synchronous motor drive
Synchronous motor driveSynchronous motor drive
Synchronous motor drive
 
Synchronous machines
Synchronous machinesSynchronous machines
Synchronous machines
 
Dc motor drive
Dc motor driveDc motor drive
Dc motor drive
 
Electric drive
Electric driveElectric drive
Electric drive
 
Basics of motor drives
Basics of motor drivesBasics of motor drives
Basics of motor drives
 
Variable frequency drives (vfd)
Variable frequency drives (vfd)Variable frequency drives (vfd)
Variable frequency drives (vfd)
 

Similar to What is variable frequency drive & how it works

VFD Basics v 1 (Gilson).pptx
VFD Basics v 1 (Gilson).pptxVFD Basics v 1 (Gilson).pptx
VFD Basics v 1 (Gilson).pptxalagu20
 
Variable frequency drive and variable frequency control
Variable frequency drive and variable frequency controlVariable frequency drive and variable frequency control
Variable frequency drive and variable frequency controlvishalgohel12195
 
Chapter 7 Application of Electronic Converters.pdf
Chapter 7 Application of Electronic Converters.pdfChapter 7 Application of Electronic Converters.pdf
Chapter 7 Application of Electronic Converters.pdfLiewChiaPing
 
Electric drives control
Electric drives controlElectric drives control
Electric drives controlAnandKumar2123
 
Solid State Control of Electric Drive
Solid State Control of Electric DriveSolid State Control of Electric Drive
Solid State Control of Electric DriveSHIMI S L
 
Varaible Speed Drives for Motor Driven Fire Pumps
Varaible Speed Drives for Motor Driven Fire PumpsVaraible Speed Drives for Motor Driven Fire Pumps
Varaible Speed Drives for Motor Driven Fire PumpsJames S Nasby
 
Electric-Traction-Railways.ppt
Electric-Traction-Railways.pptElectric-Traction-Railways.ppt
Electric-Traction-Railways.pptssuserf805c8
 
Electrical energy issues presented by arshad khan chiniot power limited
Electrical energy issues presented by arshad khan chiniot  power limitedElectrical energy issues presented by arshad khan chiniot  power limited
Electrical energy issues presented by arshad khan chiniot power limitedarshadkhanmarwat
 
electricdrive-190317155824.pdf
electricdrive-190317155824.pdfelectricdrive-190317155824.pdf
electricdrive-190317155824.pdfMaulikPandya25
 
Variable Frequency Drives.pptx
Variable Frequency Drives.pptxVariable Frequency Drives.pptx
Variable Frequency Drives.pptxYogesh Patel
 
Introduction_to_Mechatronics_Chapter3.pdf
Introduction_to_Mechatronics_Chapter3.pdfIntroduction_to_Mechatronics_Chapter3.pdf
Introduction_to_Mechatronics_Chapter3.pdfBereket Walle
 
Study of Vector Control Algorithm and Inverter design for BLDC Motor, V/f con...
Study of Vector Control Algorithm and Inverter design for BLDC Motor, V/f con...Study of Vector Control Algorithm and Inverter design for BLDC Motor, V/f con...
Study of Vector Control Algorithm and Inverter design for BLDC Motor, V/f con...Amol Mahurkar
 
Predefined speed control of bldc motor
Predefined speed control of bldc motorPredefined speed control of bldc motor
Predefined speed control of bldc motorEdgefxkits & Solutions
 
Speed Control of 3Phase Induction Motor Using VFD (IOT Based)
Speed Control of 3Phase Induction Motor Using VFD(IOT Based)Speed Control of 3Phase Induction Motor Using VFD(IOT Based)
Speed Control of 3Phase Induction Motor Using VFD (IOT Based)HamzaMajeed16
 
Speed control of induction motor using vf ds
Speed control of induction motor using vf dsSpeed control of induction motor using vf ds
Speed control of induction motor using vf dsAli Hassan
 
Electrical_motors1.ppt
Electrical_motors1.pptElectrical_motors1.ppt
Electrical_motors1.pptMervatMalaka2
 
Ac motor drives new
Ac motor drives newAc motor drives new
Ac motor drives newMaheshNaik93
 

Similar to What is variable frequency drive & how it works (20)

Vfd sharad
Vfd sharadVfd sharad
Vfd sharad
 
Drives training
Drives trainingDrives training
Drives training
 
VFD Basics v 1 (Gilson).pptx
VFD Basics v 1 (Gilson).pptxVFD Basics v 1 (Gilson).pptx
VFD Basics v 1 (Gilson).pptx
 
Variable frequency drive and variable frequency control
Variable frequency drive and variable frequency controlVariable frequency drive and variable frequency control
Variable frequency drive and variable frequency control
 
motor drives.ppt
motor drives.pptmotor drives.ppt
motor drives.ppt
 
Chapter 7 Application of Electronic Converters.pdf
Chapter 7 Application of Electronic Converters.pdfChapter 7 Application of Electronic Converters.pdf
Chapter 7 Application of Electronic Converters.pdf
 
Electric drives control
Electric drives controlElectric drives control
Electric drives control
 
Solid State Control of Electric Drive
Solid State Control of Electric DriveSolid State Control of Electric Drive
Solid State Control of Electric Drive
 
Varaible Speed Drives for Motor Driven Fire Pumps
Varaible Speed Drives for Motor Driven Fire PumpsVaraible Speed Drives for Motor Driven Fire Pumps
Varaible Speed Drives for Motor Driven Fire Pumps
 
Electric-Traction-Railways.ppt
Electric-Traction-Railways.pptElectric-Traction-Railways.ppt
Electric-Traction-Railways.ppt
 
Electrical energy issues presented by arshad khan chiniot power limited
Electrical energy issues presented by arshad khan chiniot  power limitedElectrical energy issues presented by arshad khan chiniot  power limited
Electrical energy issues presented by arshad khan chiniot power limited
 
electricdrive-190317155824.pdf
electricdrive-190317155824.pdfelectricdrive-190317155824.pdf
electricdrive-190317155824.pdf
 
Variable Frequency Drives.pptx
Variable Frequency Drives.pptxVariable Frequency Drives.pptx
Variable Frequency Drives.pptx
 
Introduction_to_Mechatronics_Chapter3.pdf
Introduction_to_Mechatronics_Chapter3.pdfIntroduction_to_Mechatronics_Chapter3.pdf
Introduction_to_Mechatronics_Chapter3.pdf
 
Study of Vector Control Algorithm and Inverter design for BLDC Motor, V/f con...
Study of Vector Control Algorithm and Inverter design for BLDC Motor, V/f con...Study of Vector Control Algorithm and Inverter design for BLDC Motor, V/f con...
Study of Vector Control Algorithm and Inverter design for BLDC Motor, V/f con...
 
Predefined speed control of bldc motor
Predefined speed control of bldc motorPredefined speed control of bldc motor
Predefined speed control of bldc motor
 
Speed Control of 3Phase Induction Motor Using VFD (IOT Based)
Speed Control of 3Phase Induction Motor Using VFD(IOT Based)Speed Control of 3Phase Induction Motor Using VFD(IOT Based)
Speed Control of 3Phase Induction Motor Using VFD (IOT Based)
 
Speed control of induction motor using vf ds
Speed control of induction motor using vf dsSpeed control of induction motor using vf ds
Speed control of induction motor using vf ds
 
Electrical_motors1.ppt
Electrical_motors1.pptElectrical_motors1.ppt
Electrical_motors1.ppt
 
Ac motor drives new
Ac motor drives newAc motor drives new
Ac motor drives new
 

Recently uploaded

TEST CASE GENERATION GENERATION BLOCK BOX APPROACH
TEST CASE GENERATION GENERATION BLOCK BOX APPROACHTEST CASE GENERATION GENERATION BLOCK BOX APPROACH
TEST CASE GENERATION GENERATION BLOCK BOX APPROACHSneha Padhiar
 
Introduction of Object Oriented Programming Language using Java. .pptx
Introduction of Object Oriented Programming Language using Java. .pptxIntroduction of Object Oriented Programming Language using Java. .pptx
Introduction of Object Oriented Programming Language using Java. .pptxPoonam60376
 
KCD Costa Rica 2024 - Nephio para parvulitos
KCD Costa Rica 2024 - Nephio para parvulitosKCD Costa Rica 2024 - Nephio para parvulitos
KCD Costa Rica 2024 - Nephio para parvulitosVictor Morales
 
input buffering in lexical analysis in CD
input buffering in lexical analysis in CDinput buffering in lexical analysis in CD
input buffering in lexical analysis in CDHeadOfDepartmentComp1
 
SOFTWARE ESTIMATION COCOMO AND FP CALCULATION
SOFTWARE ESTIMATION COCOMO AND FP CALCULATIONSOFTWARE ESTIMATION COCOMO AND FP CALCULATION
SOFTWARE ESTIMATION COCOMO AND FP CALCULATIONSneha Padhiar
 
CS 3251 Programming in c all unit notes pdf
CS 3251 Programming in c all unit notes pdfCS 3251 Programming in c all unit notes pdf
CS 3251 Programming in c all unit notes pdfBalamuruganV28
 
Introduction to Artificial Intelligence: Intelligent Agents, State Space Sear...
Introduction to Artificial Intelligence: Intelligent Agents, State Space Sear...Introduction to Artificial Intelligence: Intelligent Agents, State Space Sear...
Introduction to Artificial Intelligence: Intelligent Agents, State Space Sear...shreenathji26
 
Analysis and Evaluation of Dal Lake Biomass for Conversion to Fuel/Green fert...
Analysis and Evaluation of Dal Lake Biomass for Conversion to Fuel/Green fert...Analysis and Evaluation of Dal Lake Biomass for Conversion to Fuel/Green fert...
Analysis and Evaluation of Dal Lake Biomass for Conversion to Fuel/Green fert...arifengg7
 
Uk-NO1 kala jadu karne wale ka contact number kala jadu karne wale baba kala ...
Uk-NO1 kala jadu karne wale ka contact number kala jadu karne wale baba kala ...Uk-NO1 kala jadu karne wale ka contact number kala jadu karne wale baba kala ...
Uk-NO1 kala jadu karne wale ka contact number kala jadu karne wale baba kala ...Amil baba
 
The Satellite applications in telecommunication
The Satellite applications in telecommunicationThe Satellite applications in telecommunication
The Satellite applications in telecommunicationnovrain7111
 
Comprehensive energy systems.pdf Comprehensive energy systems.pdf
Comprehensive energy systems.pdf Comprehensive energy systems.pdfComprehensive energy systems.pdf Comprehensive energy systems.pdf
Comprehensive energy systems.pdf Comprehensive energy systems.pdfalene1
 
ADM100 Running Book for sap basis domain study
ADM100 Running Book for sap basis domain studyADM100 Running Book for sap basis domain study
ADM100 Running Book for sap basis domain studydhruvamdhruvil123
 
Turn leadership mistakes into a better future.pptx
Turn leadership mistakes into a better future.pptxTurn leadership mistakes into a better future.pptx
Turn leadership mistakes into a better future.pptxStephen Sitton
 
Javier_Fernandez_CARS_workshop_presentation.pptx
Javier_Fernandez_CARS_workshop_presentation.pptxJavier_Fernandez_CARS_workshop_presentation.pptx
Javier_Fernandez_CARS_workshop_presentation.pptxJavier Fernández Muñoz
 
Stork Webinar | APM Transformational planning, Tool Selection & Performance T...
Stork Webinar | APM Transformational planning, Tool Selection & Performance T...Stork Webinar | APM Transformational planning, Tool Selection & Performance T...
Stork Webinar | APM Transformational planning, Tool Selection & Performance T...Stork
 
AntColonyOptimizationManetNetworkAODV.pptx
AntColonyOptimizationManetNetworkAODV.pptxAntColonyOptimizationManetNetworkAODV.pptx
AntColonyOptimizationManetNetworkAODV.pptxLina Kadam
 
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...Sumanth A
 
Theory of Machine Notes / Lecture Material .pdf
Theory of Machine Notes / Lecture Material .pdfTheory of Machine Notes / Lecture Material .pdf
Theory of Machine Notes / Lecture Material .pdfShreyas Pandit
 
High Voltage Engineering- OVER VOLTAGES IN ELECTRICAL POWER SYSTEMS
High Voltage Engineering- OVER VOLTAGES IN ELECTRICAL POWER SYSTEMSHigh Voltage Engineering- OVER VOLTAGES IN ELECTRICAL POWER SYSTEMS
High Voltage Engineering- OVER VOLTAGES IN ELECTRICAL POWER SYSTEMSsandhya757531
 

Recently uploaded (20)

TEST CASE GENERATION GENERATION BLOCK BOX APPROACH
TEST CASE GENERATION GENERATION BLOCK BOX APPROACHTEST CASE GENERATION GENERATION BLOCK BOX APPROACH
TEST CASE GENERATION GENERATION BLOCK BOX APPROACH
 
Introduction of Object Oriented Programming Language using Java. .pptx
Introduction of Object Oriented Programming Language using Java. .pptxIntroduction of Object Oriented Programming Language using Java. .pptx
Introduction of Object Oriented Programming Language using Java. .pptx
 
KCD Costa Rica 2024 - Nephio para parvulitos
KCD Costa Rica 2024 - Nephio para parvulitosKCD Costa Rica 2024 - Nephio para parvulitos
KCD Costa Rica 2024 - Nephio para parvulitos
 
input buffering in lexical analysis in CD
input buffering in lexical analysis in CDinput buffering in lexical analysis in CD
input buffering in lexical analysis in CD
 
SOFTWARE ESTIMATION COCOMO AND FP CALCULATION
SOFTWARE ESTIMATION COCOMO AND FP CALCULATIONSOFTWARE ESTIMATION COCOMO AND FP CALCULATION
SOFTWARE ESTIMATION COCOMO AND FP CALCULATION
 
CS 3251 Programming in c all unit notes pdf
CS 3251 Programming in c all unit notes pdfCS 3251 Programming in c all unit notes pdf
CS 3251 Programming in c all unit notes pdf
 
Introduction to Artificial Intelligence: Intelligent Agents, State Space Sear...
Introduction to Artificial Intelligence: Intelligent Agents, State Space Sear...Introduction to Artificial Intelligence: Intelligent Agents, State Space Sear...
Introduction to Artificial Intelligence: Intelligent Agents, State Space Sear...
 
Analysis and Evaluation of Dal Lake Biomass for Conversion to Fuel/Green fert...
Analysis and Evaluation of Dal Lake Biomass for Conversion to Fuel/Green fert...Analysis and Evaluation of Dal Lake Biomass for Conversion to Fuel/Green fert...
Analysis and Evaluation of Dal Lake Biomass for Conversion to Fuel/Green fert...
 
Uk-NO1 kala jadu karne wale ka contact number kala jadu karne wale baba kala ...
Uk-NO1 kala jadu karne wale ka contact number kala jadu karne wale baba kala ...Uk-NO1 kala jadu karne wale ka contact number kala jadu karne wale baba kala ...
Uk-NO1 kala jadu karne wale ka contact number kala jadu karne wale baba kala ...
 
The Satellite applications in telecommunication
The Satellite applications in telecommunicationThe Satellite applications in telecommunication
The Satellite applications in telecommunication
 
Comprehensive energy systems.pdf Comprehensive energy systems.pdf
Comprehensive energy systems.pdf Comprehensive energy systems.pdfComprehensive energy systems.pdf Comprehensive energy systems.pdf
Comprehensive energy systems.pdf Comprehensive energy systems.pdf
 
ADM100 Running Book for sap basis domain study
ADM100 Running Book for sap basis domain studyADM100 Running Book for sap basis domain study
ADM100 Running Book for sap basis domain study
 
Turn leadership mistakes into a better future.pptx
Turn leadership mistakes into a better future.pptxTurn leadership mistakes into a better future.pptx
Turn leadership mistakes into a better future.pptx
 
ASME-B31.4-2019-estandar para diseño de ductos
ASME-B31.4-2019-estandar para diseño de ductosASME-B31.4-2019-estandar para diseño de ductos
ASME-B31.4-2019-estandar para diseño de ductos
 
Javier_Fernandez_CARS_workshop_presentation.pptx
Javier_Fernandez_CARS_workshop_presentation.pptxJavier_Fernandez_CARS_workshop_presentation.pptx
Javier_Fernandez_CARS_workshop_presentation.pptx
 
Stork Webinar | APM Transformational planning, Tool Selection & Performance T...
Stork Webinar | APM Transformational planning, Tool Selection & Performance T...Stork Webinar | APM Transformational planning, Tool Selection & Performance T...
Stork Webinar | APM Transformational planning, Tool Selection & Performance T...
 
AntColonyOptimizationManetNetworkAODV.pptx
AntColonyOptimizationManetNetworkAODV.pptxAntColonyOptimizationManetNetworkAODV.pptx
AntColonyOptimizationManetNetworkAODV.pptx
 
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...
 
Theory of Machine Notes / Lecture Material .pdf
Theory of Machine Notes / Lecture Material .pdfTheory of Machine Notes / Lecture Material .pdf
Theory of Machine Notes / Lecture Material .pdf
 
High Voltage Engineering- OVER VOLTAGES IN ELECTRICAL POWER SYSTEMS
High Voltage Engineering- OVER VOLTAGES IN ELECTRICAL POWER SYSTEMSHigh Voltage Engineering- OVER VOLTAGES IN ELECTRICAL POWER SYSTEMS
High Voltage Engineering- OVER VOLTAGES IN ELECTRICAL POWER SYSTEMS
 

What is variable frequency drive & how it works