LS VFD Applications and Functions

LS VFDLS VFD
1 EME Business Div.EME Business Div.
LS Variable Frequency DriveLS Variable Frequency Drive

LS VFDLS VFD
Application
- Textile (Loom)
- Textile (Warper)
- Textile (Traverse)
- Slitting machine
- Socks making machine
- Steel plate line speed control system
- Coiler driving system
- Extruder (Screw type)
- Running machine
- Industrial washing machine
- Printing machine
- Hoist (Lift)
- Elevator
- AHU control
- Cooling Tower
- Aeration tank motor driving system
- Humidity control – Textile factory
- Apartment water supply system
- Fuel pump driving system
ContentsContentsContents

LS VFDLS VFD
Textile(Loom)
1. Introduction
- Driving of yarn drum of loom should be controlled
in line with main motor. Because the conventional
system uses reduction gear, gearing ratio should be
changed if the product type is altered. Therefore, we
decided to control tension using inverter.
- Field : Textile/loom
- Type : iS5/iS7
3. Main function
- Linkage control: Speed of main motor that releases the
spool should be controlled in line with line speed of the
drum ⇒Rpm of main motor (for spool driving) is used
as feedback for main speed control.
- PID control: Feedback tension control
4. System configuration
M2 M4
M3M1
Drum
Encoder
Final
Product Textile
Manufacturer
Tension
maintaining bar
Spool
Tension sensor
Fixed bar
Main
Motor
Master
INV
Slave
INV
V
1
5
G
5
G
V
1
V
2
V
2
M1
M2
Pulse/voltage
converter
3-phase
iS5/
iS7
Main
Motor
P/V
P/C Pulse/current
converter
P/C
Tension sensor
Encoder
2. Process configuration

LS VFDLS VFD
Winding
Threads
Textile(Warper)
1. Introduction
- Winds several strands of yarns in a plane.
Inverter controls winding and tension power.
- Field: Textile/Warper
- Type: SV150iS7-4/SV150iS5-4
- Motor spec: 15㎾,440V.60㎐
Bridle roll for maintaining tension
Yarn spacing maintaining device
3. Main function
-Winder: Winds aligned yarns
-Bridle Roll: Applies tension to yarns
-Comb-shaped structure: Aligns yarns uniformly
4. Others
- In the system construction diagram,
the threads consist of more than hundreds
(300~600) of yarns.
Yarns released from the threads are aligned
by the comb-shaped structure and tension is
applied to them while they pass the bridle roll.
Then, they are wound by the winder after
passing the second comb-shaped structure .
- The bridle roll controls back tension with
vector inverter. The winder is controlled
by “PI” using iS7/iS5.
5. Operation Method

LS VFDLS VFD
yarn
Drum
Cheese
Guide groove
Where yarns are
wound
Fixed
Guide
iS5
(15kW)
Front ViewSide View
Lint
Roving
Machine
Spinning
Machine
Winder
Winder
controller
Clutch
Clutch
controller
Para. Description Set Value
DRV-1 Acc. 8sec.
DRV-2 Dcc. 12sec.
DRV-4 Frequency mode Keypad-1
I/0-12 P1 UP
I/O-13 P2 DOWN
I/O-40 FM Output Freqency
I/O-41 FM Output Gain 78%
I/O-42 Detect Frequency 51Hz
I/O-43 D. Frequency Band 8Hz
I/O-44 Multi function FDT-5
Para. Description Set Value
DRV-1 Acc. 8sec.
DRV-2 Dcc. 12sec.
DRV-4 Frequency mode Keypad-1
I/O-40 FM Output Freqency
I/O-41 FM Output Gain 78%
APP-01 Mode selection Traverse
APP-02 Traverse Band 7.8%
APP-03 Scramble size 0%
APP-04 Traverse Acc 1.1sec.
APP-05 Traverse Dcc 1.6sec.
APP-06 Offset(Hi) range 0%
APP-07 Offset(Lo) range 0%
Parameters
for iS5 traverse
Function
Parameters
for performing
traverse operation
through external
sequence
3. Main function
4. Others
- Traverse operation is performed using traverse function
of APP Group, which is characteristic of iS5
- Conventionally, traverse operation was performed using
inverter’s up-down operation and FDT function. However,
it required additional volume and contact points.
- When winding yarns, it is necessary to guide the yarns
with traverse.
- By traverse operation, the drum’s rpm is altered
periodically, so that the yarns do not cluster locally
(ribbon effect) or cut off.
- Field: Textile machine/loom
- Type: SV-iS5/iS7
1. Introduction
2. Process & system configuration
Textile(Traverse)
Drum
Cheese
Motor
0.4kW

LS VFDLS VFD
Looper
Position
Sensor 037iS7-2
V1
V2
Pneumatic
V1
V2
V1
V2
Main controller
Main speed control (0~10V)
UnwinderSlitting
machine
Rewinder
- Slits material of sanitary napkin for women (width: 1 m)
in 8 strands and rewinds it.
- Field: Linked controller/unwinder, slitting, rewinder,
pinch
- Type - Unwinder: 037iS7-2 1EA
Slitting bridle: 037iS7-2 1EA
Rewinder: 022iS7-2 4EA
Pinch machine: 037iS5-2 1EA
1. Introduction 3. Main function
- Maximum line speed is 200m/m, and 10V main speed control
is input.
- Unwinder: Because minimum diameter of roll is 100Φ and the
gearing ratio is 30:46,40:132,30:24, i.e. 4.048:1, the
maximum motor speed is
(200/0.1π)(132/40)(46/30)(24/30)=2577rpm. Also,
because maximum diameter of the initial material is 1500Φ,
motor speed at the maximum line speed becomes
(200/1.5π)(132/4046/30)(24/30)=172rpm. That is, 172 ~
2577 rpm should be maintained at the maximum line speed.
- Slitting bridle: Because minimum diameter of roll is 114Φ and
the gearing ratio is 24:44,21:44, i.e. 3.841:1, the maximum
motor speed becomes (200/0.1π)(44/21)(44/24)=2145 rpm.
- Rewinder : Because minimum diameter of roll is 190Φ and the
gearing ratio is 30:46,1:5, i.e. 7.667:1, the maximum motor
speed becomes (200/0.1π)(46/30)(5/1)=2569rpm. And, at
the maximum diameter of 1200Φ, the motor speed becomes
(200/1.2π)(46/30)(5/1)=407rpm.
- The rewinder uses torque minor loop mode in iV5 winder
version.
- The unwinder uses iV5 winder version with variable external
PI speed control. The Looper position data is linked with front
slitting bridle operation.
Slitting machine
037iS7-2022iS7-2

LS VFDLS VFD
Spool
Socks
manufacturing
Driving
Force
Transfer
Motor
Socks
iG5A
Socks making machine
1. Introduction
- LS inverter used for main driving source
of socks manufacturing machine
- Field: Socks manufacturing machine
- Type: Inverter (SV-iG5A)
3. Major function
4. Others
Inverter
• Forward driving startup (FX-CM)
• JOG function
• Speed control by keypad
• Torque increase by manual torque boost function
- Production speed can be regulated by
controlling motor speed with inverter
- Because JOG operation is possible, tangled yarns
can be disentangled using JOG frequency.
- Noise is reduced by inverter operation.
- Machine handling becomes easy because
machine operating part and inverter can be
connected easily.

LS VFDLS VFD
iS7
Steel plate
Drum
3Φ
Leveler
Cutting Roll
Steel plate
Cutter
Steel plate line speed control system
1. Introduction 3. Major function
4. Others
Steel plate
- LS inverter used in steel plate production line
- Field: Individual machine (roller)
- Type: SV-iS7
- Leveler’s main role is to remove residual stress.
- Product size can be controlled precisely by leveler
line speed control using inverter.
- UP-Down operation and Jog function for ease
operation.
- Vector was used to precisely control line speed in
order to obtain precise dimension of final product.
- AC reactance was applied at input line for power-
factor improvement and input circuit protection.
- Forward driving startup (FX-CM)
- Up/Down operation
- Jog frequency operation
- Use DB resistor
- Motor overheat prevention
- Overload trip

LS VFDLS VFD
Drum(24inch*6,16inch*9,12inch*1)
Drum
Twist
Capstan
4. Others
Coiler driving system
- The conventional winding motor requires large
current for startup and is disadvantageous in
productivity.
- Inverter is used to reduce startup current and
improve productivity.
- Load : Coiler
- Inverter: SV1320iP5A-4 (132㎾)
- Motor:110㎾ (Modified winding motor)
- During startup: Acceleration time should be
selected so that the normal speed can be attained
within 1min for general 150% load.
- During stoppage : Because the rotational inertia is
large, free run stoppage and machine brake are used.
• Twister: Twists 16 strands of wire released from each drum.
• Capstan: Applies tension to maintain the twisted state.
- Because winding motor is used directly to inverter,
internal resistance of the motor was removed.
⇒ During wire connection, overheat may damage
the wire.
Decelerator

LS VFDLS VFD
product
M
iP5A
Raw
materials
Screw
Extruder(Screw type)
1. Introduction
- LS inverter used for extruder screw driving
- Field: Extruder screw
- Type: Inverter (SV-iP5A)
3. Major function
4. Others
Inverter
• Speed control by variable resistor (V1)
• Motor overheat prevention
• Overload trip
- Productivity can be increased because extruder screw
speed can be easily controlled by variable resistor (V1).
- The screw speed can be controlled in real time
depending on the temperature of extruder cylinder.
- If the motor is overloaded or overheated because of
poor extrusion, the self-protection function protects
the motor and inverter without additional equipment.
- Because the motor speed is controlled by frequency,
the wider and more precise control is possible
compared with conventional step control.
- Motor noise is reduced.

LS VFDLS VFD
Motor SV-iC5
1Φ
Running machine (Treadmill)
4. Others
- LS inverter used for controller of running
machine driving motor
- Field: Running machine
- Type: Inverter (SV-iC5)
Inverter
• Speed change by Up/Down operation
• Sensorless vector operation
• Motor overheat prevention
• Overload trip
• Control by communication
- Strong torque characteristics at low speed by
sensorless vector
- Smooth acceleration/deceleration and reduced
noise
- Product stability increased by motor overheat
prevention and inverter overload prevention
- Communication with running machine specific
controller is possible

LS VFDLS VFD
- Industrial washing machine : Hotel, Hospital
Factory, Laboratory, Chemical, etc
- Field : Machinery(Washing Machine)
- Inverter : SV-iG5A(1phase : 1.5,2.2kW)
SV-iS5/iS7(3phase : 5.5,7.5kW)
- Motor : 1Hp ~ 10Hp
- 16 level multi step operation
- Acc/dec. time auto transfer feature – only for LGIS
- Speed commend : Multi step operation or RS485
: Low speed(washing), high speed(dehydration)
- Acc/dec. time auto transfer : two deferent acc/dec.
time ⇒ low speed and high speed
- Overheat level setting feature and overheat trip
: When reach to the overheat level, according to the
set value
⇒ Decel/stop, Free Run/stop,
or lower the carrier frequency to prevent the trip
DRUM
INV
Industrial washing machine
IM
4. Others

LS VFDLS VFD
EiS7
Encoder
Gear
Tension
Controller
0~10V
Volume
resistor
2nd
color
printing
1st color
printing
1. Introduction
3. Major function
4. Others
- Prints two colors after unwinding paper roll, and then rewinds it.
- Field: Individual machine (printing machine)
- Inverter: SV037iS7-4 (3.7㎾)
- Motor spec: 3.7㎾ (Encoder equipped to general motor : 1,000Pulse)
- The rpm variation should be within 1rpm for
printing accuracy.
⇒ If variation becomes large, printing position may
not coincide in 1-color printing and 2-color printing.
- ASR (Automatic speed regulator) P,I gain control
⇒ P gain : 40%
I gain : 400㎳
Printing machine

LS VFDLS VFD
Rack & pinion
Lighting
tower
~
AXA, AXC
Run signal
※ Braking operation system
- A system for driving hoist, which is used for repairing
lighting towers of baseball park. No precise control is
required, but it is required to improve riding comfort.
- Field: Hoist/lift
- Type: inverter(SV-iS7)
1. Introduction
1) Speed control by voltage
2) Inverter run output is used for brake signal
3) Lifting/descent signal is controlled by the rider
with lever.
3. Major function
M/C
Brake
4. Others
1) Dynamic Braking resistor is used to prevent
release during deceleration.
2) Acceleration/deceleration time is determined by
stop signal and stop position from test operation.
DC brake is used to improve riding comfort during
brake.
3) Brake opening signal should be generated by
accepting inverter run signal because signal delay
or signal error may happen, and it is recommended
to equip additional protection equipments such as
governor in preparation for inverter error.
Hoist(Lift)
iS7
iS7

LS VFDLS VFD
iV5 M
Electronic Brake
encoder
Counter
Weight
Car
Sensor
Elevator
1. Introduction
- LS vector inverter used for high speed elevator
control with its special feature
- Field: Elevator
- Type: Inverter(SV-iV5L)
3. Major function
4. Others
1) Height detection by inverter
2) Acquires optimum speed pattern by calculating
remaining distance
3) Position signal is transferred to main controller
continuously
4) Driving signal of electronic brake is directly
controlled by inverter
1) iV5-L or iV5 can be selected depending on
requirements of main controller.
2) Because the inverter should send and receive specific
signal with main controller, matching with the main
controller is important.(iV5L Version)
3) Motor characteristic value is tuned without really
driving the motor, by stop-type auto-tuning.

LS VFDLS VFD
- Damper control → Inverter control
▶ Energy saving / Automatic control
- Facility : AHU(Air handling unit)
- Model: SV-iS7/iS5, iG5A, iP5A
3. Major function
- Create the optimum air control through VFD
- Automatically control the air flow
- Supply is on and return is automatically on or off
depending on the flow of air
4. Control system
10EA 7EA
13EA 11EA
System convert from
RS232 to RS485
using the converter
5. Others
- Total VFD no. : 49
- Control 49 VFD through RS485 communication
from the main control PC in control room
- VFD automatically control the air flow according
to the speed commend from control room
AHU control
SF
RF
INV
Speed commend(RS485)
RA
Control
Room
Temp.
SENSOR
Flow
Sensor
INV Speed
commend(RS485)
1. Introduction

LS VFDLS VFD
PID
Temperature
Sensor
V1
<PID Control>
V1 Display
Variable
Resistor
Cooling water
Cooling Tower
FAN
Cooling Tower
1. Introduction
- Cooling tower is used to cool down circulation water
of chemical process. Because the cooling method is
air-cooling, fan is required. The fan is driven by motor.
- Conventionally, cooling of circulation water was done
in On/OFF mode. However, we introduced speed control
by inverter for precise control and energy saving.
- Field: Fan/cooling tower
- Type: iP5A
Temperature
Sensor
Temperature
Sensor
3. System configuration
4. Main function
PID Controller
- Frequency jump: Generally, the cooling tower has
two or three resonance points within 0~60㎐.
Therefore, operation may happen at resonance
points if inverter is used for speed control. In this
case, shafts that link motor bearing or motor with
fan may be damaged.
⇒ When applying frequency jump function, precise
resonance points should be identified. For this
purpose, speed is gradually checked in installation.
M
iP5A

LS VFDLS VFD
Power
(㎾)
Aeration tank motor driving
1. Introduction
M
iP5A
PID
Control
Air bubble
Water
Concentration
detection
Blower
3. Major function
4. Others
- DO(dissolved Oxygen) of water is controlled for
rapid reaction of pollutants and chemicals.
- Inverter is used for speed control.
- Inverter is used for precise control and
energy saving.
- Field: Blower/aeration tank
- Type: SV750iP5A-4(75㎾)
- Motor spec: 75㎾, 2-pole
- PID control is used to precisely control
water concentration.
- Even the blower is energy-saving load, energy
is not saved if aeration tank is the main load.
⇒ Pressure is applied to the blower of aeration tank
because it is positioned in water. Therefore, a large
torque is required to overcome the pressure and expel
air bubble. Here, the water pressure acts as damper.
< Load amount vs. Power consumption >
Load(blow or flow volume)
General energy saving
characteristic curve
Damper control and aeration tank
characteristic curve

LS VFDLS VFD
Factory
Room
Humidity
feedback
Sensor
Additional
Sensor
Speed
commend
Humidity control – Textile factory
1. Introduction
3. Major function
4. Others
- Humidity control of textile factory is important with regard to product quality.
- The humidity control is performed by spraying moisture in room between air path. Generally,
this spraying is controlled by valve, but if inverter is used, there will be advantage in control
efficiency and energy saving.
- Field: Pump
- Type: SV-iP5A
- If there arises current non-equilibrium at input,
this is due to factory electricity supply. It can be
solved by adding reactors.
- Because the installed valve control system is
replaced by motor speed control system, all that is
required is matching valve control amount and
speed control output. No additional function is
required.
iP5A

LS VFDLS VFD
Apartment
(12~18F)
6 buildings / 860
households
Pressure gauge
P1
Underground
water tank
P2 P3 P4
PLC
IP5A
4. Others
Apartment water supply system
- Water supplying to apartment households
- Field: Water supply pump for high-rise apartment
- Type: Inverter(SV-iP5A)
1) Inverter
- Forward driving startup (FX-CM)
- Speed control by variable resistor(V1)
- Control by communication
2) PLC
- Process PID control
- PLC (Master-k80s) was used as main controller.
Speed of 4 inverters was controlled by PID control.
- Because the water volume is controlled in real time
using inverter, the conventional water tank
becomes unnecessary.
- Motor noise is reduced remarkably because motor
speed is controlled by inverter.
- Remote water supply system control is possible
using PMU (optional).
IP5A
IP5A
IP5A

LS VFDLS VFD
P
P
P
P
Pressure signal
Transfer
4~20mA
INPUT
4~20mA
DCS Control System
Fuel pump driving system
- Fueling pump for supplying oil to airplane.
Oil pressure is maintained by inverter depending
on load change.
- Field: Pump
- Type: SV-iP5A
- To maintain constant pressure, load (fueling amount)
is controlled by inverter in order - PID control
⇒ 4~20㎃ of pressure signal is transferred to DCS,
and DCS sends PID output for inverter control.
- Because the motor was for medium-voltage (6,600V),
UP/DOWN transformer was used to control low
voltage inverter (440V).
⇒ Inverter input was decreased from 6,600V to 440V.
Then, inverter output was increased from 440V to
6,600V because the motor was for 6600V.
⇒ Heat resistance is important when selecting the
UP/DOWUN transformer, because heat is generated.
4. Others
IP5A IP5A IP5A

LS VFD Applications and Functions

Recommended

Recommended

More Related Content

What's hot

What's hot (17)

Similar to LS VFD Applications and Functions

Similar to LS VFD Applications and Functions (20)

More from Công ty TNHH Kỹ Thuật Tự Động HƯNG PHÚ - HƯNG PHÚ Automation

More from Công ty TNHH Kỹ Thuật Tự Động HƯNG PHÚ - HƯNG PHÚ Automation (17)

Recently uploaded

Recently uploaded (20)

LS VFD Applications and Functions