YASKAWA Mechatronics Solutions High Performance Inverter with Advanced Vector Control Varispeed G7.

YASKAWA Mechatronics Solutions

High Performance InverterHigh Performance Inverterwith with

Advanced Vector ControlAdvanced Vector Control

Varispeed G7Varispeed G7

YASKAWA Mechatronics SolutionsVarispeed G7Varispeed G7

• 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

Main Design IntentionsMain Design Intentions

YASKAWA Mechatronics SolutionsVarispeed G7Varispeed G7 YASKAWA Mechatronics SolutionsVarispeed G7 – 3-Level ControlVarispeed G7 – 3-Level Control

Main Features:

• Reduced surge voltages

• Reduced bearing corrosion due to low bearing currents

• Reduced electrical noise

• Reduced audible noise

• Reduced leakage currents

Worlds First 400V 3-Level Control InverterWorlds First 400V 3-Level Control Inverter


How The 3-Level Method Works:How The 3-Level Method Works:

Tr1

Tr2

Tr3

Tr4

V P N

P

N

Motor

+ -

VP N

2

VPN

2

VPN :DC bus voltage

One phase output circuit

Tr1 Tr2 Tr3 Tr4 Potential

ON ON OFF OFF P

OFF OFF ON ON N

OFF ON ON OFF 0

• 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 !

0

P

0 level

N

VPN

2

Varispeed G7 – 3-Level ControlVarispeed G7 – 3-Level Control


VPN /2

+

0

-

VPN /2

VPN

VPN

+

-

Cir

cuit

VPN

U V W

P

N

VPN

U V W

P

N

0

Ph

ase

Vol

tage

Lin

eV

olta

geConventional Model

[2-level Control]Varispeed G7

[3-level Control]


Comparison:Comparison:


Low Surge VoltagesLow Surge Voltages

0

VPN

770V peak

0

VPN

1200V peak

Conventional 2-level switching

G7 3-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



Low Motor Bearing CurrentsLow Motor Bearing Currents

Shaft

Winding

Bearing currents

Bearing

• Reduced bearing currents

• Thus electrolytic corrosion is lowered

• Bearing lifetime is extended



Low Earth Leakage CurrentsLow Earth Leakage Currents

• Earth leakage currents are greatly reduced

• Effect on earth leakage circuit breakers is minimized

• No problems with long, shielded motor cables

11A

5A

Conventional 2-level switching

G7 3-level switching



Excellent Torque CharacteristicExcellent Torque Characteristic

0 0.3 1.5 3 10 Operation frequency (Hz)

250

200

150

100

50

Tor

que

(%)

Open Loop Vector 2

Closed Loop Vector

Output Torque

150% at 0.3Hz 150% at 0 Hz

Speed control range

1:200 1:1000

• New flux observer improves torque characteristic

Accurate Torque ControlAccurate Torque Control

• Allows precise limiting of output torque

• Protects machines and materials from damages caused by over torque

Motor speed

Load torque

Torque Ref

Varispeed G7 – High PerformanceVarispeed G7 – High Performance


Highly Improved Speed Response• Very fast response to frequency reference

changes:

Motor speedMotor speed

900 min-1

Torque referenceTorque reference

50ms

100%

960 min-1

[Vector control with PG: No load]

Motor speedMotor speed

450 min-1 8 min-1

100%Torque reference

Motor currentMotor current 8A 28A

250ms

[Vector control with PG: With load]

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)



New Autotuning FunctionNew Autotuning Function1. Rotating autotuning as known from G5

2. Non rotating autotuning for measuring line-to-line resistance

3. 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

IM

IM

IM


New Speed Search FunctionNew Speed Search Function

• Very soft speed search in both directions

• Shorter recovery time after momentary power loss (halved in in-house comparison)

YASKAWA Mechatronics SolutionsVarispeed G7Varispeed G7Varispeed G7 – Easy To UseVarispeed G7 – Easy To Use

Full Text OperatorFull Text Operator

• 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


• Easy cooling fan replacement

• Cooling fan operating time monitor as maintenance indicator

• Fan On/Off control extends cooling fan life time

Varispeed G7 – Easy To UseVarispeed G7 – Easy To Use

Easy maintenance and inspectionEasy maintenance and inspection

• Terminal board can be removed easily

• Fast replacement without removing the control circuit wiring


Effect of Energy SavingsEffect of Energy SavingsEffect of Energy SavingsEffect of Energy Savings

Efficiency with EnergyEfficiency with Energy Saving ControlSaving Control

Load (%)Load (%)

Mot

or E

ffic

ien

cy

Mot

or E

ffic

ien

cy

(%)

(%)

00

100100

5050

5050 100100

Efficiency Efficiency with Standard with Standard Operation(60Hz)Operation(60Hz)

Energy Saving ControlEnergy Saving Control

• Achieves highest efficiency for any application

• Saves energy costs

• In V/f and Vector control modes

Varispeed G7 – Gentle To EnvironmentVarispeed G7 – Gentle To Environment

Harmonics Current ReductionHarmonics Current Reduction

• 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


Global Specification

Varispeed G7 – Global SpecificationVarispeed G7 – Global SpecificationVarious Power supplyVarious 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 StandardsGlobal Standards• UL and cUL• CE

Global Field Bus SupportGlobal Field Bus Support• MEMOBUS with RS422/485

as standard• Device Net• Profibus-DP• Interbus-S• CC-Link• CANopen• ControlNet• LONworks

LISTEDUSC ®

ULISTED

USC ®U

MEMOBUS(As standard)DeviceNetProfibus-DPInterBus-S *CC-LinkCANopen *ControlNet *LONworks *

Option card for communication

Fie

l d N

e tw

o rk

s


General Features

Varispeed G7 – General FeaturesVarispeed 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


General Features

Varispeed G7 – General FeaturesVarispeed 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 1:200 in OLV2, 1:1000 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.

YASKAWA Mechatronics SolutionsVarispeed G7Varispeed G7Varispeed G7 – Easy To Make ExclusiveVarispeed 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.)

Software Tool – DriveWorksEZSoftware Tool – DriveWorksEZ


• 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

Varispeed G7 – The SolutionVarispeed G7 – The Solution

SummarySummary

YASKAWA Mechatronics Solutions High Performance Inverter with Advanced Vector Control Varispeed G7.

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