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transcript
Tomorrow’s Automation, Today
A Symposium on Virtualization For the Process & Manufacturing Industries
TR03B Variable Frequency Drives
Omar Javed – Manager Sales Oct. 20, 2015 |15:00 PM – 15:30 PM
Variable Frequency Drives
AgendaThis session explains very brief overview
of Variable Frequency Drives; general introduction followed by industrial examples, applicable industries and
operations to be focused.
What is VFD?
What are the concerns?
Solutions
What is VFDElectrical/electronic pieceof equipment that variesthe speed of a 3 phase ACmotor.
Also Called:
VSD [ Variable Speed Drive]
ASD [Adjustable Speed Drive]
AFD [Adjustable frequency drive]
4
Basic VFD Operations
Convert AC power to DC power.
Filter DC power.
Invert DC power to variable voltage and variable frequency AC power
5
VFD Block Diagram
Motor Load Groups: Constant Torque Load
100
Horsepower Demanded by the Load %
Speed %
100
Torque Demanded by the Load %
Speed % 100 100
7
Constant Torque “CT” Applications
Positive Displacement Pumps
Reciprocating Compressors
Rotary Compressors
8
Variable Torque Load
Torque Demanded by the Load %
Speed % 100
100
Horsepower Demandedby the Load %
Speed %
100
100
9
Variable Torque “VT” Applications
Centrifugal Fans
Centrifugal Pumps
Centrifugal Blower
10
Affinity Law
𝐵𝐻𝑃1𝐵𝐻𝑃2
=𝑁1
𝑁23
BHP = Brake Horsepower
N = Speed
Example
N1 = 3,550 N2 = (3,550 x .9) = 3,195
BHP1 = 3.53
BHP2 = [3.53 x (3,195/3,550)3 ] = [3.53 x (.9 x .9 x .9)] = (3.53 x .729) = 2.574
11
Speed Reduction by 10% Achieve savings up to 30 %
12
Output or Cable Device Termination
AC Drive
Input Filter**
Line Reactor
Input fusing & circuit breakers
AC
Sup
ply So
urce
AC Motor
13
Normal Duty or Heavy Duty
If a normal duty overload characteristic is chosen, an oversize motor allows up to 110% torque performance for up to 1 min. in both CT and VT.
This function is used mainly for pumps and fans, since these applications do not require an overload torque.
If a heavy duty overload characteristic is chosen, a rated motor with the frequency converter obtains up to 160% torque for 1 min. in both CT and VT
14
What do You Need to Know to Select a Drive?
Current rating (A) of the motor
kW rating of the motor
Type of Machine (Application)
IP Rating
• IP20 = Clean Switch room, Switchboard
• IP54 = Dust/Damp Wall Mount
• IP66 = Washdown
Functionality
• How is the drive being controlled?
• I/O?
• Communications?.
Most Important
Least Important
15
PowerFlex Family of Low Voltage Drives
PowerFlex Drives meet worldwide standards out of-the-box, achieving EMC, global voltage and safety requirements.
PowerFlex Compact Drives offer cost-effective motor control for machine-level and stand-alone applications (PowerFlex 523, 525, 527, 40, 40P)
PowerFlex Standard Drives are designed for application flexibility and control system integration (PowerFlex 400, 70, 700, 753)
PowerFlex Premium Drives are designed for advanced applications with tight control system integration and extended Power Ranges (PowerFlex 700L, 700H, 700S, 755)
Power Flex MV Drives (7000 & 600) Designed for Medium Voltage Applications
17
Power
Pe
rfo
rman
ce
Compact
Standard
Premium
PowerFlex Family of Low Voltage Drives
18
PowerFlex 750 Series AC Drives
PowerFlex 755Premium Integration
AC Drive
PowerFlex 753General Purpose
AC Drive
Panel Mount Drives0.75 to 250 kW @ 400V1.0 to 350 Hp @ 480 V.5 to 300 Hp @ 600V5.5 to 250 kW @ 690V
Panel Mount Drives0.75 to 250 kW @ 400V1.0 to 350 Hp @ 480V.5 to 350 Hp @ 600V5.5 to 250 kW @ 690V
Floor Mount AC Drives315 to 1400 kW @ 400V400 to 2000 Hp @ 480V250 to 1500 Hp @ 600V200 to 1500 kW @ 690V
PowerFlex 750-Series AC Drives
Ratings to 250 kW/350 Hp Ratings to 1500 kW / 2000 Hp
19
PowerFlex MV (7000, 6000)
Rockwell’s 3rd generation MV Drive
Incorporates leading-edge technology, embedded communications, and significant commonality across multiple platforms, networks, operator interface programming and hardware.
Designed for end users, solution providers and OEMs
Air-cooled and Liquid-cooled drives
Applications ranging up tov9000 horsepower (6340 kW).
20
Value Delivered
Faster Time to Market
$ $$
Lower Total Cost of Ownership
Improved Asset Utilization
Enterprise Risk Management
Timeline Review
Original Hardwired SystemTypically configured using:
Two different software tools
Two different cables or converters
Sometimes by two different people
23
Early NetworksSame as hardwired system
Typically configured using two different software tools
Two different cables or converters
Sometimes by twodifferent people
24
Use of Dual NetworksTypically configured using two different software tools
25
Integrated Software TodaySingle Software Tool
Configure network i/o connection to the drive One time, in One place & by One person
Eliminates potential for user error when configuring network i/o
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Success StoryLalpir Power Plant & Nestle
4
Question & AnswersThank You for Your Valuable Time
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