Robicon Perfect Harmony Medium Voltage AC Drives
Robicon Perfect Harmony Medium Voltage AC Drives
Robicon Perfect Harmony
Medium Voltage AC Drives
industrial POWER CONTROL
Unlike conventional power control
technology, the Perfect Harmony AC
drive is easy to use and maintain. Plus,
the soft start features of the Perfect
Harmony decrease stresses that can
limit the life of your equipment.
The Business Behind a Variable
Frequency Drive
If you haven't installed a VFD yet, you're
letting thousands of dollars of energy
costs eat away at your bottom line
every month.
The culprit? An inefficient process.
The US Department of Energy (DOE)
says that industrial motors consume
over a billion kilowatt hours of energy
each year – 50 percent of the world's
energy usage. System improvements
such as improved sizing and proper
matching to load, use of more efficient
drive trains, and use of adjustable speed
drives will help drive energy usage
down, according to the DOE. That
means the right drive helps you drive
cost out of your operation.
Siemens has the largest installed base
of medium voltage AC drives. We serve
all segments of the market, as we’re the
only company that offers drives from
300 to 160,000 HP (225 to 120,000 kW).
Selecting the right drive system for
your application – no matter what the
industry or application – means your
maintenance costs go down while
your production numbers stay high.
The right system even means lower
operating costs when your new drive
allows you to build a more energy
efficient process.
The Perfect Harmony drive from
Siemens is the world's best-selling
medium voltage AC drive. And there
is good reason it should be your drive.
For most applications, installing a
Perfect Harmony Variable Frequency
Drive can immediately slash energy
costs, improve productivity and
protect the environment.
Rely on the Number One Source for Medium Voltage AC Drives
Getting the Right Service and
Support Helps, Too
The Siemens difference is apparent
from the first meeting. Our experts
have tailored thousands of systems.
So you’ll see right away that we have
the right level of power conversion
experience to help select the right
drives to streamline your process.
1
The Perfect Harmony of Performance, Process and Technology
Setting the Standard in Power
Conversion
Since its introduction in 1994, the
Perfect Harmony drive has revolutionized
power conversion and continues to set
industry standards for reliability and
innovation. However, advances are
made without “reinventing the wheel”
like other drive manufacturers. We
have maintained the Perfect Harmony’s
core topology and continue to advance
its capability, ensuring life-cycle product
support. The Perfect Harmony of today
represents an evolution founded on
experience garnered from our huge
installation base.
Designed for Maximum
Versatility, Efficiency and
Reliability
The patented, integrated design of
the Perfect Harmony drive ensures
a level of reliability, efficiency and
versatility that is unmatched in the
power controls industry. The Perfect
Harmony is designed to withstand
failures that would overwhelm
conventional drive systems.
Proven Solutions for Every
Industry
The most successful medium voltage
drive ever built, the Perfect Harmony
is used in thousands of applications
around the world. From water
treatment to power generation to oil
and gas production, we can provide a
custom-engineered Perfect Harmony
drive to maximize your process.
2
What is an Integrated Variable Frequency Drive (VFD)?
A traditional VFD features up to five separate components, such as harmonic filter, power factor correction, transformer,
power converter, and motor filter. However, the Perfect Harmony’s topology integrates these elements so an isolation
transformer and power converter are the only major components required. The integrated system allows for quick, easy and
less expensive installations and start-ups. Shortening your outages and process downtime gives you more project flexibility.
Designed for Maximum Versatility, Efficiency and Reliability
Perfect Harmony Topology Structure
Isolation
Transformer
Power
Converter
Harmonic
Filtering
Power Factor
Correction
Motor
Filter
Isolation
Transformer
Power
Converter
Conventional
VFD
Perfect
Harmony
Integrated
VFD
In the Perfect Harmony, a series of low voltage cells are linked together to build the medium
voltage power output of the drive system. This patented configuration gives the Perfect Harmony
many advantages when it comes to maintenance, power quality and reliability. It also provides the
basis for one of its most most important advantages – increased reliability through the advanced
cell bypass option.
3
4160 VOLT DRIVE TOPOLOGY 6600 – 7200 VOLT DRIVE TOPOLOGY
4
The Perfect Harmony can accept many
different input voltages and can provide
motor output voltages up to 13,800
volts, putting it in a class by itself.
Efficiency
The integrated Perfect Harmony
maximizes efficiency in a number of
critical areas.Integration helps provide
quick and reliable start-ups, a smaller
footprint and allows for the addition
of power conversion redundancy. It
all adds up to a smaller, more efficient
and reliable system.
Versatility
The proven technology of the Robicon
Perfect Harmony drive meets the needs
of customers in many industries, from
water treatment to energy production to
chemical processing. Siemens is the only
industrial power controls manufacturer
to offer this level of system versatility
to its customers.
And when it comes to retrofits, the Perfect
Harmony upholds its reputation as the
world’s most versatile medium voltage
drive. The Perfect Harmony is compatible
with existing motor systems, regardless
of age, brand or voltage/frequency – even
synchronous motors.
You can be sure that the Perfect Harmony
is compatible with your power system as it
meets the most stringent IEEE 519 1992
requirements for voltage and current
harmonic distortion.
The Perfect Harmony exceeds .95 power factor at normal operating speeds without
external power-factor correction capacitors. It also provides more than 98 percent
VFD efficiency and 97 to 96.5 percent total drive system efficiency.
VFD
Efficiency (%)
Total Drive System
Efficiency (%)
(VFD &
Transformer)
Load (%) Power Factor
25 97.5 - 93.4 97.0 - 96.5 .96 50 98.0 - 95.0 97.2 - 96.8 .96 75 98.5 - 97.5 97.2 - 96.8 .96 100 98.6 - 98.0 97.0 - 96.5 .95
Efficiency and power factor values are based on centrifugal load characteristics
for torque and speed.
System Performance
5
Harmonic Comparison of Typical 1,000 HP
12-Pulse PWM Inverter vs. Perfect Harmony Series
1,100KVA, 5.75% Impedance Source
18 Pulse, Multi-level PWM
Source Current
Source Voltage
18 Pulse, Multi-level PWM
Source Current u u
Source Voltage o V e
SCR Converter CSI
without Power Factor
Correction Capacitors
Robicon Perfect Harmony
10 20 30 40 50 60 70 80 90 100
50
55
60
65
70
75
80
85
90
95
100
Percent Speed
Total power factor includes distortion and displacement power factor.
CSI PWM or LCI
Perfect Harmony
10 20 30 40 50 60 70 80 90 100
80
82
84
86
88
90
92
94
96
98
100
Percent Load
System efficiency includes isolation transformer, harmonic filter,
power factor correction and drive.
Unfiltered, 12-Pulse Input Diode Rectifier
Source Current
Source Voltage S e t
Unfiltered, 12-Pulse Input Diode Rectifier
Source Current u C n
Perfect Harmony Series Waveform
less than 3% total voltage distortion
less than 5% total current distortion
Meets IEEE 519-1992 at the input to the isolation transformer
12-Pulse Harmonic Waveform
5.9% total voltage distortion
8.8% total current distortion
Clean Power Input
The Robicon Perfect Harmony drive meets the most stringent harmonic requirements for voltage
and current distortion.
• Protects other on-line equipment from harmonic disturbance (computers, telephones, lighting ballast)
• Prevents “cross-talk” with other sensitive control and variable frequency drives
• Avoids costly harmonic filters and associated resonance problems
Typical System Efficiency
Robicon “Perfect Harmony” Series vs. CSI PWM or LCI
Measured Power Factor
Power Factor (%)
Efficiency (%)
Power Quality Output
• No common mode motor insulation stress
– Perfect Harmony includes an isolation transformer integral in common mode dissipation
– Motor does not require 10 to 13 kV insulation
• Drive is compatible with both new and existing 1.0 service factor induction or synchronous motors from any manufacturer
without any special design considerations
• No significant VFD induced torques pulsations – even at low speeds
• No need for expensive flexible couplings
• No additional VFD induced motor heating
• No cable length restrictions
• Allows standard motor insulation – decreasing the motor insulation requirements to less than an across-the-line start motor
Perfect Harmony
Output Waveforms at 100% Speed
Perfect Harmony
Output Waveforms at 50% Speed
CELL 1
CELL 2
CELL 3
COMPOSITE
6
Multi-Level, Pulse-Width Modulated,
Output-Voltage Waveform
Maximizes Uptime Through Redundancy and ProToPS™ Process Control
Reliability
The reliability of the Perfect Harmony
drive is second to none due to Siemens’
common-sense approach to component
selection and design. Traction grade
insulated Gate Bipolar Transistors (IGBTs)
form the backbone of the Perfect Harmony
drive. Built-in high volumes and serving
as a proven power device across the
industrial power control industry, IGBT
technology has been in existence for
more than a decade. The stability and
availability of IGBTs give you reliable,
long-term, life-cycle confidence. But
that’s just the start of our forwardthinking design.
Advanced Cell Bypass
The Perfect Harmony is engineered
to withstand failures that would overwhelm conventional drives because
we’ve added redundancy options into
the system. Our patented, cell-based
configuration maximizes uptime and
simplifies modifications. Through a
redundant bypass control that is
completely separated from each power
cell, the Perfect Harmony ensures
automatic bypass of a failed power
cell in 250 milliseconds (less than 1/4
of a second).
Another feature that bolsters the Perfect
Harmony’s reliability is its control strategy.
Our Process Tolerant Protection Strategy
(ProToPS™) is a groundbreaking process
control system available exclusively from
Siemens. Instead of tripping the drive and
automatically shutting down the system
due to a malfunction, ProToPS provides
a hierarchical system of warnings. This
control strategy allows time to evaluate
the situation and respond appropriately
to avoid a system shutdown. ProToPS has
proved invaluable for many of our Perfect
Harmony customers, including strategic
power plants, refineries, water and
wastewater facilities, and process plants.
Factory System Test
Upon delivery, you can be confident
that the Perfect Harmony will get your
process running because we have the
ability to test every product as a
complete system at full load. At our
factory, we test every transformer and
power converter together so that any
imperfections can be identified and
corrected before the product is shipped.
In addition, factory testing allows
accurate efficiency measurements. We
also verify sequence of operation and
protection to ensure that the Perfect
Harmony system matches your needs.
Advanced Power Cell Bypass Advanced Power Cell Bypass Advanced Power Cell Bypass
Protecting Process Quality
If a power cell is bypassed, there is minimal degradation of the motor’s
output power quality, as the Perfect Harmony’s advanced power cell
bypass system ensures that your process is uninterrupted.
Advanced Cell Bypass Results
Percent of
Nominal
Voltage
During Dip
Duration of Dip in Milliseconds
Voltage Dip Withstand Capability during
Full Load, Nominal Voltage
The Perfect Harmony operates continuously,
even during a 30 percent voltage dip.
Voltage Dip Withstand Capability
Equivalent Circuit of
4-Cell Generation3
Harmony Drive
with all cells
in service
4160 Volts Typ.
(Line-to-Line)
Equivalent Circuit of
4-Cell Harmony Drive
with Cell A4 out
of service
• Unbalance after
loss of A4
(not acceptable)
Equivalent Circuit
of 4-Cell Harmony
Drive with Cell A4
out of service
• Neutral Point Shift:
Balance Restored
after loss of A4 by
adjusting angles.
Maximum Voltage =
87.5% x 440V =
3850V
7
8
Easy Set-up and Control
• Easy to use high function key pad on the door
• Touch-screen interface on door also available
• Auto-tune feature shortens start-up and guarantees
operational efficiency
• Drive tool runs on PC’s which can interface through
the RS 485 or ethernet ports that are standard
• Other protocols supported:
Modbus PlusTM
DeviceNet Profile 12TM
ControlNetTM
PROFIBUS DPTM
Other connectivity as required by the user
Control Drive Tool
• Provides windows-based graphical
user interface
• Has full functionality
• Same menu structure as
keypad interface
Edit a Parameter
Menu Structure
Window
Graphic Window
Drive Status
Window
• • • •
Trusted in the Most Demanding Applications
The Perfect Harmony is regularly applied
by the most reliability and quality
conscious industries and their most
demanding applications.
Oil and Gas
ESP's – offshore and onshore for powering
electrical submersible pumps at cable
lengths up 35 km (22 miles) without
complicated output filters.
High Speed Compressors - process critical
high speed applications for liquefied
natural gas and refineries consistently
choose the Perfect Harmony because it
delivers sinusoidal power at output
frequencies of 330 hertz and beyond
making these systems less complicated,
more efficient and lowering their life
cycle maintenance.
Power Generation
Induced and forced draft boiler fans –
when the power has to be delivered
the Perfect Harmony has been the
overwhelming choice of the U.S. power
generation market because of the
Siemens’ engineering expertise and
the remarkable reliability that the each
and every installation has shown.
Water
In more than 20 countries, the Perfect
Harmony drive is the medium voltage
drive of choice for all types of critical
clean water and wastewater pumping
applications.
Adding to the versatility of the Perfect
Harmony drive, it is available with
forced-air-cooling (bottom) or selfcontained, closed-loop, water-cooling
(top). Redundant pumps are standard
on water-cooled units. Redundant
blowers are a standard option for
air-cooled units. The multi-cell design
allows quick rack in/out of power cells,
making maintenance of the Perfect
Harmony very quick and simple. A
hydraulic “cell lifter cart” is an option
for larger cell designs.
9
Through Siemens’ alliances with
ship owners, designers and leading
component suppliers, we can provide
comprehensive electrical systems for all
types of marine applications, including
complete ship propulsion and thruster
systems for merchant, naval and
scientific ships; drilling and exploration
platforms; passenger ships; and
waterway ferries.
10
Marine
The Perfect Harmony helps our marine
customers reduce costs and enhance
power quality and reliability, while
maximizing space. Additionally, the
Perfect Harmony offers regeneration
capability that many marine customers
demand. Through Siemens’ alliances
with ship owners, designers and leading
component suppliers, we can product
comprehensive electrical systems for
all types of marine applications.
Paper
Through an advanced control strategy
called sensorless or closed-loop
vector control, the Perfect Harmony
drive provides precise torque and
speed control to a wide range of
demanding applications in the pulp
and paper industry.
At Siemens, we lead the way with
industry “firsts” in medium voltage
drive technology. Since its introduction
in 1994, the Perfect Harmony drive has
set the standard for medium voltage
technology and continues to innovate.
We constantly solicit customer
feedback and use it to guide product
enhancements. Advances, however,
are made without “reinventing the
wheel.” While others change their
drive topology, Siemens maintains
the same topology from generation
to generation. Our customers have
the option to easily upgrade their
drives with the latest available
technology and features. By keeping
the same topology, our customers
see a reduction in maintenance and
spare parts, as well as an increase in
quality and reduced life-cycle costs.
Setting the Standard in High-Power Conversion
•
1994 • Developed cell-based modular technology, making medium
voltage drives easier to scale and service, while providing a
smaller footprint
• First IGBT-based drive at medium voltage
• First fully integrated medium voltage drive to meet all IEEE 519
compliance standards without optional equipment
• First filterless, standard, motor-compatible, medium voltage drive
• First extended cable-length medium voltage drive to power an
electrical submersible pump motor
•
1995
• First IGBT-based
6.6 kV drive without
an output transformer
•
1996
• First IGBT-based
drive above 10000
horsepower
(7500 kW)
11
A History of Continuous Improvement
Siemens has consistently led the
industry in innovation and quality.
As power switching device technology
advances and increases output voltage
capability, Siemens improves each
generation of the Perfect Harmony in
three key areas: fewer parts, increased
efficiency and a smaller drive footprint.
Moving forward, Siemens will remain
on the leading edge of medium voltage
technology with the following features
on future Perfect Harmony drives:
• Intuitive interface systems to make
the Perfect Harmony drive more
user friendly
• Installation wizards for quick and
easy start-up
Cinergy Corporation Inc., the
largest non-nuclear electric
supplier in the U.S., is improving
the efficiency of its Cinergy/PSI
Gibson Generation Station in
Owensville, Ind., by installing 15
sets of 6600 V Perfect Harmony
drives and Robicon motors as part
of an environmental compliance
project. The total capacity of the
new drives and motors will be
more than 150,000 HP, which will
contribute to the site’s overall
capacity of 3,380 megawatts.
Gibson Station is the third
largest coal-fired generating
station in the country, generating
approximately 20,000,000 net
megawatt hours annually.
• Remote monitoring and control
to allow customers or Siemens
to operate the drive, manage its
performance or diagnose service
concerns from any global location
• Intelligent diagnostics to empower
the Perfect Harmony drive to
independently and automatically
correct service concerns
• Parallel redundant control systems to
provide peace of mind to customers
requiring maximum reliability through
redundancy of all drive functions to
help prevent disruptions
Siemens’ investments in emerging
technologies will culminate as these
features are introduced in upcoming
generations of the Perfect Harmony drive.
•
1998
• First drive to offer a
process tolerant
protection strategy
(ProToPS™)
• 500th Perfect
Harmony drive
installed
•
1999
• First drive to provide
process-transparent,
cell-bypass capability
and neutral-point shift
•
2000
• First voltage-fed drive to
operate a medium voltage
synchronous motor
•
2001
• 1000th Perfect Harmony
drive installed
•
2002
• 1500th Perfect Harmony
drive installed
•
2003
•
2004
• Largest pulse width
modulated drive ever
built – 80,000 HP
•
2005
• Introduced the
smallest footprint
medium voltage
VFD in the
world – Robicon
MicroHarmony
• First high voltage 13.8 kV
drive capable of operating
motors from 4000 HP to
90000 HP (3000 kW –
67000 kW), connected
direct at 13.8 kV
12
Protecting Our Customers’ Investments with Superior Service and Support
Siemens’ service and support
network is never more than a phone
call away. Representatives are ready
24 hours a day, seven days a week,
to assist customers with immediate
technical support geared to handle
every phase of installation, startup,
maintenance and troubleshooting.
Our services include:
• Around-the-clock field service
• Preventative maintenance
• Product refurbishment
• Training
• After-market spare parts
• Upgrades
• Repairs and exchanges
• Specialty services
Our Commitment
Siemens is proud of its reputation for
long-term service of its products, including
the Perfect Harmony. We are committed
to providing complete life-cycle support.
We never relinquish the responsibility
for servicing our products to the full
satisfaction of our customers, regardless
of the age of the product. To extend the
lifespan and increase the functionality
of the drive, the Siemens refurbishment
program provides our customers with
the opportunity to upgrade their Perfect
Harmony drive with new technology as
it becomes available.
Local Convenience
Because we are accustomed to providing
on-site service for all of our customers,
we have the extensive reach of a
dedicated, global service force. Each
of our service representatives is fully
trained in variable frequency drives.
We are committed to growing our sales
and service staff and branching out into
new regions to support the growth of
our installed base.
All Siemens LD-R service representatives are fully trained in medium voltage variable frequency drives, giving Siemens the largest medium
voltage service organization in the world!
13
Maximum output frequency — 330 Hz (with derating). Speed-control range — 1:1000 (with encoder).
2.3 kV 3.3 kV 4.16 kV
Output Output Output Output Output Output
Current kVA Current kVA Current kVA
70 300 70 400 70 500
100 400 100 600 100 700
140 500 140 800 140 1000
200 800 200 1000 200 1500
260 1000 260 1500 260 1750
315 1250 315 1750 315 2000
375 1500 375 2000 375 2500
500 2000 500 2500 500 3500
660 2500 660 3500 660 4500
880 5000 880 6500
1250 7000 1250 9000
6.0 kV 6.6 kV 11 kV
Output Output Output Output Output Output
Current kVA Current kVA Current kVA
70 700 70 800 500 8000
100 1000 100 1000 800 15000
140 1500 140 1500 1400 25000
200 2000 200 2000
260 2500 260 3000
315 3000 315 3500
375 4000 375 4000
500 5000 500 5500
660 7000 660 7500
880 9000 880 9500
1250 13000 1250 14000
13.8 kV
Output Output
Current kVA
500 10000
800 18000
1400 31000
Output Parameters
Rated Motor Voltage Single Drive Configuration
Technical Specifications
General
Power semiconductors IGBTs; diodes
Line-side converter 18- to 36-pulse diode rectifier (standard)
Motor-side converter Multi-level converter (PWM)
with IGBT power modules
Closed-loop control Sensorless closed-loop control,
fully digital with signal processor
Drive quadrants Driving: 2 directions of rotation
(2 quadrant), 4 quadrant option
Potential separation:
Power section Fiber-optic cable
- Open- and closed-loop control
Permissible humidity rating Relative air humidity < 95%
non-condensing
Noise level Approx. 75 dB (A)
Efficiency 96% at the rated operating point
(standard version) including transformer
Regulations compliances IEEE, ANSI, NEMA, UL, CSA, CE
Paint finish ANSI 61 Gray
Degree of protection Acc. to DIN VDE 0470, IEC 60529,
EN 60529
- Standard IP31 (air-cooling)
IP52 (water-cooling)
NEMA 1 (air-cooling)
NEMA 12 (water-cooling)
- Optional IP42 (air-cooling)
Cooling Type
Air-cooled Forced-air cooling with integrated fans
Permissible ambient and cooling, medium temperature
- In operation 0ºC to + 40ºC: 100% load capability
+40ºC to 50ºC: current derating
- During storage -25ºC to +55ºC
- During transport -25ºC to +70ºC
Water-cooled Deionized water with integrated
water-to-water heat exchanger
Permissible ambient temperature
- In operation +0ºC to + 40ºC
- During storage -25ºC to + 55ºC
(without deionized water)
- During transport -25ºC to + 70ºC
(without deionized water)
Permissible cooling medium temperature (raw water)
- Intake +5ºC to 35ºC
- Outlet Max. +40ºC
Supply Data
Standard 2.3 to 15 kV
Special option < 2.3 and > 12 kV
Control voltage 1 Ph, 120 VAC or integrated to
auxiliary supply
Alarms Meanings
Underload Underload alarm
Single-input phasing Loss of one input phase
Ride through Drive in ride-through operation
(input voltage dip)
ProToPSTM Alarm and Trip Examples (All Configurable)
Alarms Meanings
Overspeed Alarm speed threshold reached
Overcurrent Alarm current threshold reached
Motor temperature Alarm motor temperature threshold
reached
Network failure Communication problem
Speed reference signal loss Loss of speed feedback signal
14
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