3. Variable Frequency
Drives
Agenda
This 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
4. What is VFD
Electrical/electronic piece
of equipment that varies
the speed of a 3 phase AC
motor.
Also Called:
VSD [ Variable Speed Drive]
ASD [Adjustable Speed Drive]
AFD [Adjustable frequency drive]
4
5. Basic VFD Operations
Convert AC power to DC power.
Filter DC power.
Invert DC power to variable voltage and variable
frequency AC power
5
13. Output or Cable Device
Termination
AC Drive
Input Filter**
Line Reactor
Input fusing & circuit
breakers
ACSupplySource
AC Motor
13
14. 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
15. 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
17. 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
19. PowerFlex
750 Series
AC Drives
PowerFlex 755
Premium Integration
AC Drive
PowerFlex 753
General Purpose
AC Drive
Panel Mount Drives
0.75 to 250 kW @ 400V
1.0 to 350 Hp @ 480 V
.5 to 300 Hp @ 600V
5.5 to 250 kW @ 690V
Panel Mount Drives
0.75 to 250 kW @ 400V
1.0 to 350 Hp @ 480V
.5 to 350 Hp @ 600V
5.5 to 250 kW @ 690V
Floor Mount AC Drives
315to1400kW@400V
400to2000Hp@480V
250to1500Hp@600V
200to1500kW@690V
PowerFlex 750-Series AC Drives
Ratingsto250kW/350Hp Ratings to 1500 kW / 2000 Hp
19
20. 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
21. Value Delivered
Faster Time
to Market
$ $$
Lower Total Cost of
Ownership
Improved Asset
Utilization
Enterprise Risk
Management
24. Early
Networks
Same as hardwired system
Typically configured
using two different
software tools
Two different cables or
converters
Sometimes by two
different people
24
26. Integrated
Software Today
Single 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
26
29. Lahore, Pakistan
Headquarters South East Asia
19 Km Main Multan Road
Lahore, Punjab 54660
Pakistan
Phone : + 92 42 111 940 940
Dubai, UAE
Headquarters Middle East And Asia
Office FZS1 BD04, Jebel Ali Free Zone
PO Box 18590, Dubai
United Arab Emirates
Phone: +971 4 88 60 277
Exton, USA
Headquarters Americas
180 Sheree Boulevard, Suite 1400
Exton, PA 19341
United States of America
Phone +1 610 458 8700
Regional Offices and Global Headquarters