Kein Folientitel

1
Varispeed G7
High Performance Inverterwith Advanced Vector
Control
2
Main Design Intentions

• Maintain market leader position byintroducing
  something new
• Global specification World wide usage
• Gentle to environment
• Solution to common 400V class inverterproblems
• Maximum control performance
• Wide application field
• User friendly
• Easily adaptable to users demands

3
YASKAWA
Varispeed G7 3-Level Control
Mechatronics Solutions
Worlds First 400V 3-Level Control Inverter

• Main Features
• Reduced surge voltages
• Reduced bearing corrosion due to low bearing
  currents
• Reduced electrical noise
• Reduced audible noise
• Reduced leakage currents

4
How The 3-Level Method Works
Varispeed G7 3-Level Control
One phase output circuit

• Input circuit is like on conventional inverters
  (B6/B12 rectifier)
• DC bus voltage is split by capacitors and neutral
  point is stabilized with special circuit
• Three voltage levels- Positve voltage (P)-
  Zero voltage (0)- Negative voltage (N)
• Result dv/dt becomes halfed !

P
Tr1
Motor
Tr2
0
-
V P N
Tr3
Tr4
N
VPN DC bus voltage
5
Comparison
Varispeed G7 3-Level Control
Conventional Model2-level Control
Varispeed G7 3-level Control
P
Circuit
VPN
N
U
V
W


Phase Voltage
VPN /2
VPN
0
-
-
Line Voltage
VPN
VPN /2
6
Low Surge Voltages
Varispeed G7 3-Level Control
Conventional 2-level switching

• Switching the half DC bus voltage reduces surge
  voltages
• Motor winding insulation is stressed less
• Motor lifetime is lengthened
• No problems with older, bad insulated motors
  anymore

G7 3-level switching
7
Varispeed G7 3-Level Control
Low Motor Bearing Currents

• Reduced bearing currents
• Thus electrolytic corrosion is lowered
• Bearing lifetime is extended

8
Low Earth Leakage Currents
Varispeed G7 3-Level Control
Conventional 2-level switching

• Earth leakage currents are greatly reduced
• Effect on earth leakage circuit breakers is
  minimized
• No problems with long, shielded motor cables

G7 3-level switching
9
Excellent Torque Characteristic
Varispeed G7 High Performance

• New flux observer improves torque characteristic

Open Loop Vector 2 Closed Loop Vector
Output Torque 150 at 0.3Hz 150 at 0 Hz
Speed control range 1200 11000
Accurate Torque Control

• Allows precise limiting of output torque
• Protects machines and materials from damages
  caused by over torque

10
Highly Improved Speed Response
Varispeed G7 High Performance

• Very fast response to frequency reference changes

G5 G7
OLV 5 Hz 10 Hz
CLV 30 Hz 40 Hz

• Speed change caused by sudden load changes can be
  leveled out in just a few milliseconds
• Torque control in open loop vector control mode
  (formerly with PG only)

11
New Autotuning Function
Varispeed G7 High Performance

• Rotating autotuning as known from G5
• Non rotating autotuning for measuring
  line-to-line resistance
• Non rotating autotuning for all motor parameters
• Motor and load have not to be uncoupled
• Highest performance on every machine type by
  using Vector control
• Easier and faster machine startup

New Speed Search Function

• Very soft speed search in both directions
• Shorter recovery time after momentary power loss
  (halved in in-house comparison)

12
Full Text Operator
Varispeed G7 Easy To Use

• 5 lines illuminated LCD display
• 7 languages
• Easy menu structure
• Verify function to detect modified constants
• Can be used as Copy-Unit
• RJ45 connector for easy external usage

13
Easy maintenance and inspection
Varispeed G7 Easy To Use

• Terminal board can be removed easily
• Fast replacement without removing the control
  circuit wiring

• Easy cooling fan replacement
• Cooling fan operating time monitor as maintenance
  indicator
• Fan On/Off control extends cooling fan life time

14
Harmonics Current Reduction
Varispeed G7 Gentle To Environment

• Models up from 18.5kW have included DC choke as
  standard (optional for smaller units)
• 12 pulse input with special input transformer for
  models up from 18.5 kW

Energy Saving Control

• Achieves highest efficiency for any application
• Saves energy costs
• In V/f and Vector control modes

15
Global Specification
Varispeed G7 Global Specification
Various Power supply
200V class 200V to 240V, 3 phase, 50/60 Hz
400V class 380V to 480V, 3 phase, 50/60 Hz
Power supply voltage tolerance 10 , -15
DC power supply possible via DC bus terminals

• Global Standards
• UL and cUL
• CE
• Global Field Bus Support
• MEMOBUS with RS422/485 as standard
• Device Net
• Profibus-DP
• Interbus-S
• CC-Link
• CANopen
• ControlNet
• LONworks

16
General Features
Varispeed G7 General Features
Capacity Range 200V class 0.4 to 110 kW400V class 0.4 to 300 kW
DC Reactor 0.4 to 15 kW optional18.5 to 300 kW standard
12-pulse Input 0.4 to 15 kW not available18.5 to 300 kW available ( a 3-winding transformer is needed)
Braking Chopper 0.4 to 15kW included18.5 to 300kW optional (external CDBR unit has to be used)
Enclosures 0.4 to 15 kW IP20 (NEMA 1)18.5 to 300kW IP00, IP20 (NEMA 1) as option (not for 2090, 2110, 4185, 4220, 4300 units)
Digital Inputs Forward Run, Reverse Run, 10 multifunction digital inputs, NPN/PNP selectable
Digital Outputs 1 fault contact (changeover contact), 2 multifunction open collector outputs, 3 multifunction contactor outputs
Analogue Inputs 1 frequency reference input (-10 to 10V), 2 multifunction inputs (1x 10 to 10V, 1x 10 to 10V/4-20mA selectable)
Analogue Outputs 2 multifunction outputs (-10 to 10V/4-20mA selectable)
Pulse Train Input 1 multifunction pulse train input (0 to 32kHz)
Pulse Train Output 1 multifunction pulse train output (o to 32kHz)
RS-422/485 standard, MEMOBUS protocol
17
General Features
Varispeed G7 General Features
Control Method Sine wave PWMV/F, V/f with PG, Open Loop Vector 1 and 2, Closed Loop Vector
Starting Torque 150 at 0.3Hz in OLV2, 150 at 0.0Hz in CLV
Speed Control Range 1200 in OLV2, 11000 in CLV
Speed Control Accuracy 0.2 in OLV 1 and 2, 0.02 in CLV
Torque Accuracy 5
Frequency Control Range 0.0 to 400Hz
Overload Capability 150 rated output for 1 minute, 200 for 0.5 sec
Braking Torque Approx. 20 (approx. 125 with braking resistor)Build in braking chopper for models of 15kW and below
Main Control Functions Momentary power loss restart, Speed search, Over-/undertorque detection, 17-step speed reference, 3 Autotuning methods, Cooling fan On/Off control, Slip Compensation, Torque compensation, Jump Frequency, HSB high slip braking, PID control (with PID sleep and soft start function), Energy saving control, MEMOBUS communications, Fault retry, Torque control, Constant copy function, etc.
Protective Functions Motor overload protection, Inverter overload/overcurrent protection, Over-/undervoltage detection, Cooling fin overheat detection, Stall prevention, Ground fault detection, Phase loss detection, Momentary power loss detection, etc.
18
Software Tool DriveWorksEZ
Varispeed G7 Easy To Make Exclusive

• DriveWorksEZ makes it possible to develop
  application specified functions very easily
• Graphical block based programming (much easier
  than CASE)
• Programming possible using operator keypad or PC
  configuration tool
• Huge application software will be available (e.g.
  winder, crane, etc.)

19
Varispeed G7 The Solution
Summary

• With G7 Yaskawa again plays the role of a
  forerunner in drive market by introducing
  3-Level technology to 400V inverter class
• G7 meets global specifications
• G7 has low effect on environment (e.g.
  peripheral devices)
• G7 solves common 400V class inverterproblems
  (e.g. leakage currents etc.)
• G7 offers maximum control performance
• G7 is user friendly and easy to handle
• G7 is easily adaptable to specific machine
  requirements using DriveWorksEZ software
• G7 covers all fields, from low up to high
  performance application