Belt Weigh feeder short presentation By Shubham saxena Tata chemicals ltd Babrala UP Contact-+918273170864

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08273170864

2. 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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5. THERE ARE FOUR ESSENTIAL COMPONENTS TO ANY CONVEYOR BELT
SCALE.
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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

8. 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
Rate
Load
Speed
Total
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 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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Tail Pully Belt adjuster

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18. 18Idealer

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24. SCM II + KSUT E C H N I C A L D E S C R I P T I O N

25. SCHEDULE
SCMII hardware description
Overview
Aux. board / CPU board
Communications
Connections
LON / Input Output
KSU hardware description
Examples of applications
KSU Menu (maintenance)

26. SCM => HARDWARE
2 versions :
SCM =
Smart
Control
Module
 « Panel »
 « On board » or « Field »
Working Temperature :
-20 to 60 ºC
Maximum moisture :
95 % without condensation
Protection :
IP 65

27. SCM II
OVERVIEW
“Panel” version…
With connection
module “A2”
CPU
Board Aux.
Board

28. SCM => HARDWARE => CASE
The case
Backplane

29. SCM => HARDWARE =>AUX.
BOARD
Supply board and interfaces I/O or « Auxiliary Board »
(Aux. Board )
 Common board to all SCMs, 110 or 230V AC

30. SCM => HARDWARE =>AUX.
BOARD
Supply part
Overvoltage protections
275 V
Supply fuses
2 x 250V 250mA T
Voltage supply selector
115 / 230

31. SCM => HARDWARE =>AUX.
BOARD
CONFIGURATION part
J1 Analogue Output
Pos.0 = voltage 0-10V
(picture)
Pos.1 = supply 4-20mA
Selector S1 :
1 = ON
2,3, = OFF
4 :Input ANA 4-20mA
OFF => float
ON => weighing
(continuous weighing application)
1
2
3
4
O
F
F

32. SCM => HARDWARE =>AUX.
BOARD
VISUALISATION part 1
SCM on
Blinking 1Hz = Interface
I/O OK
Controller excessive
temperature

33. SCM => HARDWARE =>AUX.
BOARD
VISUALISATION Part 2
Status of the 11 Inputs
OFF = Inactive Input
ON = Active Input
Status of the 4 Outputs
OFF = Inactive Output
ON = Active Output
3 Inputs
Intended to the
weighbeltfeeder application

34. SCM => HARDWARE =>AUX.
BOARD
CONNECTION Part X1 Load cell
connection
DB15f to A2 module
PC connection
DB9m diagnostic port
X2 LON connection
DB9f to A2 module
X3 I/O connection
DB37f to A2 module

35. SCM => HARDWARE => CPU
BOARD
« C.P.U. »Processor board

36. SCM => HARDWARE => CPU
BOARD
CONFIGURATION Part 1
Jumper JU4 :
ON = battery on (picture)
OFF = batterry off (spare part)
Jumper JU3 :
NORM = active RAM
CLR = erasing RAM
To be respected
imperatively!!!

37. SCM => HARDWARE =>CPU
BOARD
CONFIGURATION Part 2
SW1 Switch :
Reset CPU
SW2 Selectors :
1 = OFF => Normal
1 = ON => Test machines
2,3,4= OFF
1
2
3
4
O
F
F

38. SCM => HARDWARE => CPU
BOARD
VISUALISATION Part
CPU : blinking 1Hz = OK
Fast = Initialisating
CPU : Blinking = OUT
LON : blinking 1Hz =
MASTER mode
LON : working
CPU : ON = RESET

39. SCM => HARDWARE => CPU
Partie CONNECTIQUE
Connection for
supervision communication
Connection for
BIOS download

40. 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