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BELT WEIGH FE
EDER
C U S T O MI S E D F E R T I L I Z E R T
A T A CH E M
I C A L S LT D .
B A B R A L A
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By-shubham saxenaT.C.L
Babrala08273170864
05/02/2023
ABOUT WEIGH FEEDER- The Weigh Belt Feeder is a
relatively simple, extremely reliable gravimetric feeder providing high feeding precision and efficient process monitoring.
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Weigh Belt Feeder Principle of Operation--In a weigh belt feeder, product is feed as a continuous band onto
a conveyor belt, through an inlet slide gate or automatic pre-feeder. A load sensor under the belt continuously measures the weight of the product over a defined length of belt. The controller continuously compares the actual weight with the set point weight, and automatically adjusts the motor speed to either increase or decrease belt speed, in order to maintain a constant federate. Any variation in the density of the material is reflected as a change in belt loading, which is compensated for by adjusting the belt speed. Weigh-belt feeders can be positioned directly beneath a silo, making them suitable extraction devices for foodstuffs, animal feed, detergents and plastic pellets. The ideal inlet gate has an adjustable width, so that the profile (and thus the volume) of the material being discharged can be varied to meet the needs of the application.For inventory control or metering, the Smart Weigh Belt can be placed into a constant speed configuration to measure or totalize the amount fed into a process.
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THERE ARE FOUR ESSENTIAL COMPONENTS TO ANY CONVEYOR BELT SCALE.
1-Weigh Bridge2-Speed Sensor3-Integrator4-Conveyor
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Weigh bridge operation Strain gauge theory
A thin wire is coiled so that as the metal it is attached to is stretched the wire is made longer and thinner
The electrical resistance of the wire is related to the cross-sectional area of the wire
The change in resistance is proportional to the amount the load cell metal is flexed
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Weight
Weigh bridge operation Load cell theory
Load cells are steel frames with strain gauges mounted at points where the load cell is designed to flex
The parallelogram load cell is designed for parallel sides to stay parallel and only vertical forces are measured
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Speed sensor operation
Shaft mounted speed sensor A slotted disk rotates through
an optical encoder The slotted disk breaks the
encoder light beam to produce an output pulse proportional to the speed of the shaft rotation
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SPEED SENSOR-
Shaft Mounted Speed Sensors
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Trailing Arm Speed Sensors Speed sensor operation
Trailing arm speed sensor A gear rotates near a proximity
switch
As the teeth of the gear pass the proximity switch a pulse is generated
The output pulse is proportional
to the speed of the belt
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Integrator operation
Material Load (lbs/ft) Belt Travel
Belt Speed Sensor
RateLoadSpeedTotal
Integrator operation Receives material load information
from the weigh bridge Receives belt speed information
from the belt speed sensor Provides HMI information
Rate Load Speed Total
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Belt Speed Sensor
Belt Travel
Material Load (lbs/ft) Integrator operation
The design of all belt scales is based on the formula
LOAD X SPEED = RATE Load units are in lbs / ft. Speed units are in ft. / minute
Pounds Feet Pounds Foot Minute Minute
X =
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Belt Speed Sensor
Belt Travel
Material Load (lbs/ft)
Integrator operation The design of all belt scales is
based on the formulaLOAD X SPEED =
RATE Load units are in lbs / ft. Speed units are in ft. / minute
Pounds Feet Pounds
Foot Minute Minute
X =
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Tail Pully Belt adjuster
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r
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SCM II + KSUT E C H N I C A L D E S C R I P T I O N
SCHEDULE
SCMII hardware descriptionOverview Aux. board / CPU boardCommunications
ConnectionsLON / Input Output
KSU hardware descriptionExamples of applicationsKSU Menu (maintenance)
SCM => HARDWARE
2 versions :
SCM =SmartControlModule
« Panel »« On board » or «
Field »Working Temperature :
-20 to 60 ºCMaximum moisture :
95 % without condensationProtection :
IP 65
SCM II OVERVIEW
“Panel” version…
With connection module “A2”
CPUBoard
Aux. Board
SCM => HARDWARE => CASE
The case
Backplane
SCM => HARDWARE =>AUX. BOARD
Supply board and interfaces I/O or « Auxiliary Board » (Aux. Board )
Common board to all SCMs, 110 or 230V AC
SCM => HARDWARE =>AUX. BOARD
Supply part
Overvoltage protections
275 V
Supply fuses2 x 250V 250mA T
Voltage supply selector
115 / 230
SCM => HARDWARE =>AUX. BOARD
CONFIGURATION part
J1 Analogue OutputPos.0 = voltage 0-10V
(picture)Pos.1 = supply 4-20mA
Selector S1 :1 = ON2,3, = OFF4 :Input ANA 4-20mAOFF => floatON => weighing(continuous weighing
application)
1234
OFF
SCM => HARDWARE =>AUX. BOARD
VISUALISATION part 1
SCM on
Blinking 1Hz = Interface I/O OK
Controller excessive temperature
SCM => HARDWARE =>AUX. BOARD
VISUALISATION Part 2
Status of the 11 Inputs
OFF = Inactive InputON = Active Input
Status of the 4 Outputs
OFF = Inactive Output
ON = Active Output
3 Inputs Intended to the
weighbeltfeeder application
SCM => HARDWARE =>AUX. BOARD
CONNECTION Part X1 Load cell connection
DB15f to A2 module
PC connection DB9m diagnostic port
X2 LON connectionDB9f to A2
module
X3 I/O connectionDB37f to A2
module
SCM => HARDWARE => CPU BOARD
« C.P.U. »Processor board
SCM => HARDWARE => CPU BOARD
CONFIGURATION Part 1
Jumper JU4 :ON = battery on (picture)OFF = batterry off (spare
part)
Jumper JU3 :NORM = active RAMCLR = erasing RAM
To be respected imperatively!!!
SCM => HARDWARE =>CPU BOARD
CONFIGURATION Part 2
SW1 Switch :Reset CPU
SW2 Selectors :1 = OFF => Normal1 = ON => Test
machines2,3,4= OFF 1
234
OFF
SCM => HARDWARE => CPU BOARD
VISUALISATION Part CPU : blinking 1Hz =
OKFast = InitialisatingCPU : Blinking = OUT
LON : blinking 1Hz = MASTER mode
LON : working
CPU : ON = RESET
SCM => HARDWARE => CPU
Partie CONNECTIQUE
Connection for supervision communication
Connection for BIOS download
600
EXTERNAL LON INPUT / OUTPUT INTERFACE
LON-Bus-coupler
2 Channel Ana In
2 Channel Relay Out
2 Channel Ana Out
End Terminal
Lon Connection
24 V DC Power supply
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BY- Shubham Saxena