TScale TFB sereis User manual

Service manual

TPF / TFB Series Indicator Service Manual
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CONTENTS
1. BASIC INFORMATION……………………………………………………………1
2. PRECAUTIONS……………………………………………………………………..2
3. SPECIFICATION..…………………………………………………………………. 3
4. INSTALLATION……………………………………………………………………. 5
4.1. Unpacking…………………………………………………………………..5
4.2. Installation……………………………………………………………………6
4.3. Calibration Steps……………………………………………………………7
5. OPERATION.………………………………………………………………………8
5.1. Operation..…………………………………………………………………..8
5.2. Operation Limits…………………………………………………………….8
5.3. Load / Unload weighing...………………………………………………….8
6. MAINTENANCE……..........................................................................….9
6.1. Daily Check………………………………………………………………..9
6.2. Cleaning……………………………………………………………….9
6.3. General……………………………………………………………………10
6.4. Determine the problem………………………………………………...10
6.5. Testing Load cell……………………………………………………..10
6.6. Check Indicator voltages………………………………………………..11
6.7. Problems and Solutions…………………………………………………12
6.8. Parts Replacement………………………………………………………13
7. DRAWING…………….…………………………………………………………..15
7.1. Dimension………………………………………………………………….15
7.2. Exploder Drawing.………………………………………………………16

TPF / TFB Series Floor Scale Service Manual
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1. BASIC INFORMATION
1.1 Documentation
These installation instructions contain all data necessary for placing and
commissioning the floor scales.
1.2 Proper Use
This scale is intended to determine the weighing value of material to be weighed.
It is intended to be used as a “non-automatic balance”.
i.e. the goods to be weighed is manually and carefully placed in the center of the
weighing plate, As soon as stable weighing value is reached the weighing value
can be read.
1.3 Improper Use
Do not leave permanent load on the floor scales.
Do not load the platform, if there is any evidence of damage to the platform
or supporting structure.
Changes to the weighing system’s design are not permitted. This may lead
to incorrect weighing results, safety-related faults and destruction of the
balance.
1.4 Monitoring
In the frame work of quality assurance the measuring –related properties of the
weighing system and, if applicable test weight, must be checked regularly.
1.5 General
Two types of floor scales are available, mild steel and stainless steel.
The TPF floor scale sizes range from 1190x840mm. TFB sizes range from
1200x170x100m
Easy accessible stainless steel junction box.
Four Load cells
Adjusting leveling foot
Overload up to 150%
All models have threated holes in the decks for attaching eyebolts to
facilitate installation and cleaning

TPF / TFB Series Floor Scale Service Manual
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2. PRECAUTIONS
BEWARE OF PINCH POINTS.
USE PROPER LIFITING TECHNICS WHEN
RAISING THE LIFT DECK PLATFORMS.
ENSURE THAT STRUCTURE WHICH SUPPORT
THE FLOOR SCALE IS CAPABLE OF WITH
STANDING THE WEIGHT IF THE SCALE AND ITS
RATED CAPACITY.
2.1 Pay attention to the instructions in the manual.
Carefully read this manual before setup and commissioning, even if you are
already familiar with floor scales.
The appliance may only be operated and maintained by trained personnel.
2.2 Transport and storage
2.2.1 Testing upon acceptance
When receiving the appliance, please check packaging immediately, and the
appliance itself when unpacking for possible visible damage.
2.2.2 Packaging / Transport
Keep all parts of the original packaging for a possibly required for transport.

TPF / TFB Series Floor Scale Service Manual
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3. SPECIFICATION
Model
TPF / TPFS
TFB / TFBS
Capacity
1T / 2T / 3T
1.5T / 3T
Readability
0.5kg / 1kg / 1kg
0.5kg / 1kg
Construction
Mild Steel (A36 Carbon Steel) /
Stainless Steel (Type 304)
Grade Level
Within 3⁰of level
Operating Temperature
0°C - 40°C / 32°F - 104°F
Resolution
3000
Load Cells
4 load cell
ADC
Sigma Delta
ADC Update
≤1/10 second
Stabilization Time
One seconds typical
Gross Weight
61kg and above
45kg and above
Floor level distance
81mm & above
Packing
Wood Box

TPF / TFB Series Floor Scale Service Manual
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Load cell Specifications
Dimension
s in mm
L
L1
L2
L3
L4
H
H1
B
B
1
ØD
M
Cap:
500kg to
2T
13
0
15.
8
25.
4
76.
2
54.
2
31.
8
15.
8
31.
8
34
13.
5
M12X1.7
5
Model
H8C
Rated Capacity ( Emax)
500kg / 1T / 2T
Sensitivity
3.0 ±0.003mV/V
Accuracy Class
C3
Zero Balance
±1% F.S
Input Impedance
400 ±20Ω
Output impedance
352 ±3Ω
Insulation Impedance
≥ 5000MΩ
Temperature Range ( Compensated)
-10°C ~ +40°C
Temperature Range (Operating)
-30°C ~ +70°C
Maximum Safe Overload
150%F.S
Ultimate Overload
180%FS
Excitation , Recommend
10~12V DC
Excitation, maximum
15V DC
Protection Class
IP68
Construction
Alloy Steel
Cable
4mtr

TPF / TFB Series Floor Scale Service Manual
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4. INSTALLATION
4.1 Unpacking
Floor is relatively heavy. Always use a suitable lifting device and technics to lifit it
out of the packaging or to transport it to the required installation site.
Do not step under the suspended load, risky of injury.
When you received the goods, inspect it to make sure that it is not damaged and
accessories according to the customer’s order.
Remove all components from their packing material.
Keep the shipping container and packing material for future use.
Check the packing list.
Collect all necessary installation manuals for the equipment and
accessories.
Open the equipment and perform an inspection.
4.2 Installation
Accurate weighing results require a floor scale with perfect horizontal alignment.
During initial installation and after each change of work area it is necessary to
level the floor scale.
Select a location that is flat, solid, level and full supports the weight of
platform with full capacity load.
Use a forklift or other lifting means, along with chains,
Cables or nylon straps to remove the scale from the crate bottom.
Set the scale so that the interface cable exits in a direction where it can be
protected.
Placing the floor scale with access ramps or foot plates
Select place the floor scale
Place the floor scale correctly on the marked area of the floor scale.
Adjustable foot area wants to observe the evenness and level alignment
If any minor height difference, want to adjust adjustable foot for to
compensate level.
Connect the scale cable to the proper to the indicator.

TPF / TFB Series Floor Scale Service Manual
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Load Cell Connector Connections


4.3 Calibration Steps
Adjust the analog interface indicator to the platform.
Install all the corners to within one division of each other at 25% of the
rated capacity.
Follow the appropriate indicator manual to ensure a proper calibration
Note: The floor scale is shipped fully assembled,
wired and corners calibrated.
Corner (s) Calibration:
The Junction Box (Summing Box) Assembly has four extended range, multi-
turn potentiometer (trim pot), and one or two for each load cell.
7Pin
Connection
Pin 1
Signal -
Pin 2
Signal +
Pin 3
Shield
Pin 4
Exc -
Pin 5
Sen -
Pin 6
Sen +
Pin 7
Exc +
5Pin
Connection
Pin 1
Signal +
Pin 2
Signal -
Pin 3
Shield
Pin 4
Exc -
Pin 5
Exc +
Trim pot
1
2
3
4
Interface

TPF / TFB Series Floor Scale Service Manual
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STEPS
1. Center the trim pot by turning the adjustment screw counter clock wise
position until a clicking sound is heard, then turning each of them back
clock wise 10 turns
2. Identify the platform corner numbers.
3. Place a test weight (25% of the scale capacity) on the
corner No.1, then move it to No.2, No.3 and No.4.
Note that displayed reading on each corner.
4. Identify the lowest reading.
If scale corners require to do adjustment,
5. Place the test weight at the location of the lowest weight reading.
6. Turn the adjustment on the potentiometer clockwise to the displayed
weight. It can read the same as the highest reading.
7. Proceed clockwise; repeat the adjustment to all corners of the scale until
reading reach all corners is same. Because the trim pot interact with one
another, any adjustment will affect the weight readings at all four corners
of the scale
Note:
If junction box has two trim ports for each load cell,
want to adjust both ports for each corner.
When moving the test weight (s) from the corner to
corner, do not zero the scale. Corner adjustment is to
adjust the corners to be same, not for calibration.
8. Perform a zero reference check with an unload platform
9. Repeat the corner test to ensure all readings are the same before
proceeding.
10.Ensure all corners are same.
11.Remove all weights
12.Perform a final calibration with test weights and appropriate indicator
manual.
Then you can start your operation
2 3
PLATFORM
1 4

TPF / TFB Series Floor Scale Service Manual
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5. OPERATION
5.1 Operation
Interface connection (power is supplied via the connecting cable of the
display unit)
Initial Commissioning
Connection of peripheral devices
Adjustment, linearization and verification (Only it can be verifiable,
when it’s connected with suitable display unit)
And the correct operation will be in the operation instructions included of
the display unit.
Continuous optimal performance is guaranteed;
For Weighing operation, all objects must be placed centrically of the floor
scale and may not hang over the edges or the ramps
Check adjustment at regular intervals
Avoid falling load, shock loads and impacts from the
side.
5.2 Operation Limits
The floor scales are designed extremely robust. The load limits according
to the following table should not be exceeded..
Depending on the type of load receptacle, the static carrying capacity. The
maximum admissible load is
Weighing Range
1000kg
2000kg
3000kg
Centre
3000kg
4500kg
4500kg
Side stress
2000kg
3000kg
3000kg
One side
1000kg
2000kg
2000kg
5.3 Load / Unload weighing
Place the load on the scales using a crane or forklift or using proper lifting
technics. Ensure the load is not swinging when it is placed onto the scales.
Lift the load first vertically at least 10cm above the scales before it is
removed or newly placed

TPF / TFB Series Floor Scale Service Manual
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6. MAINTENENCE
WARNING
BEWARE OF PINCH POINTS.
USE PROPER LIFITING TECHNICS WHEN
RAISING THE LIFT DECK PLATFORMS.
ENSURE THAT STRUCTURE WHICH SUPPORT
THE FLOOR SCALE IS CAPABLE OF WITH
STANDING THE WEIGHT IF THE SCALE AND ITS
RATED CAPACITY
Permit only qualified persons to service the instrument.
Before connecting or disconnecting any components, remove the
power.
Failure to observe these precautions bodily harm or damage to or
destruction of the equipment.
6.1. Daily Check
Ensure that all four feet are in contact with the floor.
Ensure that the connecting cable to the display unit and the network
connection cable of the display unit are not damaged.
Ensure that the balance is free from dirt, especially under the edges of the
balance.
6.2. Cleaning
Remove regularly corrosive substances.
Keep IP protection.
Protect weighing cells against splash water
When using optional ramps or foot plates, keep clean the air gap at the
edge of the weighing scale.
Wipe the surfaces with a damp cloth.
Only use common household cleaner.
Do not use water jet or high-pressure cleaner.

TPF / TFB Series Floor Scale Service Manual
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6.3. General
If the scale does not operate properly, find out the problem as possible.
Determine whether the problem is constant or alternate. Be aware that problems
can be caused by mechanical or electrical influences.
Check the following.
Water
Corrosive materials
Vibrations or temperature or wind
Physical damage
Check the indicator cables for damage, and check all connections and
connecters for any loose contact or incorrect connection
6.4. Determine the Problem
Determine whether the problem is in the indicator or the platform
Remove power from the system, and disconnect the indicator from the
platform
Connect the indicator to a load cell simulator
Reapply power and test the indicator
If problem goes away, its source is probably in the platform. Check the
wiring, connecter, load cells and mechanical components of the platform.
If problem persists, its source is probably in the indicator. Check the
indicator voltages, connecters, cables and function programs.
6.5. Testing Load cell
For testing load cell, remove power from the system, and disconnect the PCB
from the Load cell
Physical Test:
Check the moisture, or foreign material inside.
Check load cell surface badly rusted or corroded
Check the strain gauge areas become compressed
Check any physical damage (body bent or twisted) to the load cell
Check load cell cable, all leads are connected, any cut, splits or tears.
Check load cell for proper input and output resistances
Electrical Test:
Use an accurate multimeter to check the ohms
Load Cell Connections

TPF / TFB Series Floor Scale Service Manual
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Signal + Green
Supply + Red
Signal - White
Supply - Black
Shield
Resistance
Leakage Resistance
Check each of the load cell wires to the load cell cable screen.
Check each of the load cell wires to the load cell body.
These readings should be greater than 1000mΩ or OL.
If this reading is less than 1000 mΩ, then this load cell has leakage between
the internal circuit and the load cell body or cable screen
Zero Balance
Connect the load cell to a stable DC source of between 5 to 10V
Connect multimeter to mV and connect to the load cell signal wires
The meter should read 0.00mV ±approximately 1 % of full load.
If the output reads greater than ±10% of full scale capacity, then the load cell
will require replacement.
6.6. Check Indicator Voltages
If the problem is in the Indicator, use a multimeter to check the following voltages
AC Power
Adaptor Voltage
PCB Input Voltage
Check Battery Voltage and Charging Voltage
Follow the instructions in the Indicator manual for to check the voltages.
Measuring Points
Resistance
+ Exc to –Exc (Input)
350 ± 3.5 Ω
+Sig to –Sig (Output)
351 ± 2 Ω

TPF / TFB Series Floor Scale Service Manual
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6.7. Problems and Solutions
Problems
Possible cause
Common Solutions
OL or -------
Maximum capacity
exceeded. Load cell or
mechanics damaged.
Power supply faulty
Check the platform is installed
correctly. Try to turn on the scale
again. Do the calibration again
------- or NULL
displayed
Weight is on the
platform is below
permissible limit. Pan
not installed correctly.
Power supply faulty.
Load cell or
mechanism faulty
Check the platform is installed
correctly. Try to turn on the scale
again.
Do the calibration again
Display is
unstable
Goods touching
somewhere. Air
variation or any
vibrations.
Temperature
changed . Load cell or
connections faulty.
Power supply faulty
Check the scale is in acceptable
location.
Check the connecters and load cell.
Check the power supply and battery
Weight value
incorrect
Calibration error.
Platform of load cell
touching somewhere.
Wrong weighing unit
Use accurate weight for to do the
calibration
Check the pan and load cell is
installed proper and touching.
Check the parameter settings.
Check the load cell and connecters
Can not use full
capacity
Over load protection
stoppers or transport
locks are not removed.
Parameters are set
incorrectly.
AD problem.
Load cell or
mechanism damaged
Check the stoppers and locks under
the platform.
Check the weighing unit and
parameter settings.
Check the load cell.
Platform Corner
Weight different
Over load protection
stoppers or transport
locks are not removed.
Load cell or
mechanism damaged
Check the stoppers and locks under
the platform.
Use accurate weight for to do the
calibration
Check the load cell.

TPF / TFB Series Floor Scale Service Manual
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6.8 Parts Replacement:
Load Cell Replacement:
Remove power from the Indicator terminal and disconnect the instrument
cable.
Remove the junction box cover and locate the defective load cell.
Disconnect the defective load cell’s cable from its terminal on the junction
box PCB (Summing PCB).
Remove the load cell from the junction box.
Carefully position the platform on a stable supporting surface that allows
access to defective load cell and cable.
Tie a string to the end of the cable attached to the defective load cell. The
string should be strong and long enough to pull the new load cell’s cable
through the platform structure.
The load cells (s) are fastened to the platform using two Head Cap Bolts.
Remove this load cell mounting bolts with a box spanner, retaining the
screws for reinstallation. Lift the load cell and spacer plate from the
mounting surface.
Carefully pull the defective load cell cable through the platform while
feeding the string in at junction box opening. Once the string reaches the
load cell mounting location, untie it from the load cell cable.
Spacer
Load Cell
Flat Washer
Spring Washer
Bolt
Adjustable
Foot

TPF / TFB Series Floor Scale Service Manual
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Remove the leveling foot from the defective load cell and reinstall it in the
new load cell.
Tie the string to the new load cell cable and carefully pull the new cable
through the platform structure to the junction box opening. Coil any excess
cable and store it within the platform.
Bolt the new load cell and spacer plate to the platform. Apply an anti-seize
compound such as “Never –Seez” to the threads of the mounting screws
and tighten them with a calibrated torque.
Thread the load cell cable through the connector of the junction box.
Wire the new load cell cable to the proper summing connector.
Level the scale with the leveling feet.
Reattach the instrument cable and power up the scale terminal.
Perform a corner test and recalibrate the scale.

TPF / TFB Series Floor Scale Service Manual
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7. DRAWING
7.1 Dimensions in mm
TPF / TPFS
TFB /TFBS
T

TPF / TFB Series Floor Scale Service Manual
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7.2 Exploder Drawing
TPF / TPFS Drawing
22
TPF / TPFS Parts List:
No
Parts Name
Qty
Material
Spec
1
Star Screw
4
SUS
M6x10
2
Junction Box Housing Cover
1
3
Hexagon Screw
6
SUS
M5x10
4
Junction Box Cover
1
SUS
5
Star Screw
4
S18C
M4x8
6
Junction Box PCBA
1
7
Insulation Washer
8
EPDM
8x4.5
8
Internal hexagon Screw
2
SUS
M6x10
9
Junction Box Case
1
SUS
10
Cable Gland
5
11
Scale base
1
12
Screw Plug
4
M14

TPF / TFB Series Floor Scale Service Manual
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13
Internal Hexagon Screw
2
S18C
M8x65
14
Washer
8
SPCC
16.5x8.5
15
Wheel
2
16
Nut
2
S18C
M8
17
Spacer
4
18
Load Cell
4
19
Flat Washer
8
SPCC
23x12.5
20
Adjustable Foot
4
SUS304
21
Bolt
8
S18C
22
Spring Washer
8
TFB /TFBS Drawing