Adam Equipment CFC SERIES User manual

Adam Equipment
CFC SERIES
SERVICE MANUAL
ADAM EQUIPMENT CO. LTD.
P.N. 7952, Rev. A2, February 2007
@Adam Equipment Company 2007

@Adam Equipment Company 2007

CONTENTS
1.0 INTRODUCTION ............................................................................................. 3
2.0 TROUBLE SHOOTING GUIDE ....................................................................... 4
3.0 ERROR CODES.............................................................................................. 5
4.0 CFC DESCRIPTION........................................................................................ 6
5.0 CFC USER PARAMETERS............................................................................. 7
6.0 CFC USER CALIBRATION.............................................................................. 9
7.0 CFC FACTORY PARAMETERS AND CALIBRATION ...................................10
7.1 FACTORY CALIBRATION..........................................................................12
8.0 LOAD CELL DAMAGE....................................................................................13
9.0 REPLACEMENT PARTS AND ACCESSORIES.............................................15
10.0 SCHEMATICS ................................................................................................16

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1.0 INTRODUCTION
The CFC series of scales are general purpose counting scales. Refer to
the Operators Manuals for details of the general operation.
This manual will cover details of calibration and troubleshooting. If you
have a problem with the scales that is not directly addressed by this
manual then contact your dealer or Adam Equipment for more
assistance.
In order to supply further assistance we will need the following
information:
A. Details of your company
-Name of your company:
-Contact person’s name:
-Contact telephone, e-mail,
fax or any other methods:
B. Details of the unit purchased
(This part of information should always be available for any future
correspondence. We suggest you to fill in this form as soon as the unit is
received and keep a print-out in your record for ready reference.)
Model name of the scale:
Serial number of the unit:
Software revision number
(Displayed when power is first turned on):
Date of Purchase:
Name of the supplier and place:
C. Brief description of the problem
Include any recent history of the unit. For example:
-Has it been working since it’s delivered
-Has it been in contact with water
-Damaged from a fire
-Electrical Storms in the area
-Dropped on the floor, etc.
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2.0 TROUBLE SHOOTING GUIDE
PROBLEMS POSSIBLE CAUSES
Display is blank Power Switch is faulty or not turned on
No turn on test Battery is faulty or not charged
Power supply is incorrect
Display all zeros after turn on Pan not installed
or E6 is displayed Unstable weight
Load cell damaged
Electronics faulty
‘- - - - -‘ appears on display Maximum capacity exceeded
Load Cell damaged
Electronics is faulty
Display is unstable Drafts or air currents
Obstruction under pan
Sample is moving (animal weighing)
Vibrations through table
Temperature changed dramatically
Electronics faulty
Battery low
Weight value incorrect Calibration error, Recalibrate
Unit calibrated with inaccurate weight
Balance not level
Obstruction between sample and cover
Wrong unit of weight displayed
Cannot use Full Capacity Over-load Stops hitting pan support or hitting
bottom of load cell
Electronics faulty
Parameters set incorrectly
Load Cell Damaged
Not Linear Overload stops hitting too soon
Faulty Factory Calibration
Off Centre Loading error Overload Stops not correct
Obstruction under pan
Battery will not charge Charging circuit failure
Battery failure
Incorrect adapter (below 800 mA)
Processor failure
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3.0 ERROR CODES
ERROR CODE DESCRIPTION POSSIBLE CAUSES
Err 4 Initial Zero is greater than the
permissible value (typically 4%
of maximum capacity) when
power is turned on or when the
[Zero] key is pressed,
Weight on the pan when
turning the scale on.
Excessive weight on the pan
when zeroing the scale.
Improper calibration of the
scale.
Damaged load cell.
Damaged Electronics.
Err5 Keyboard error. Improper operation of the
scale.
Err6 A/D count is not correct when
turning the scale on. Platform is not installed.
Load cell may be damaged.
Electronics may be
damaged.
FAILHor FAILL Calibration error Improper calibration.
If the problem persists
contact your dealer or Adam
Equipment for assistance.
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4.0 CFC DESCRIPTION
The CFC scales have an enclosure with all components mounted within
it. To gain access to the components remove the 6 screws securing the
cover to the base.
The basic unit composed of:
Load Cell
Top Pan
Load Cell frame
Transformer / external adapter
Main PCB assembly with 3 LCDs
Battery
Keypad
All models of CFC are similar except the selection of load cells and the
program.
Normally if a problem is found with a circuit board the most cost effective
method of solving the problem is to replace the circuit board.
The main PCB assembly includes:
Sections for load cell input filter
A/D converter (AU1)
Microprocessor and support circuits (U1, U4)
Power supply / battery charger circuits (U3, T1)
Please note that whenever a new PCB is installed it should match the
processor and software that is intended to be used.
As the PCBs fit many models, there is no data loaded into the memory
devices. When fitting a new PCB, always set all factory and user
parameters and perform all calibrations to allow the ADC to begin
running and weight to be displayed.
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5.0 CFC USER PARAMETERS
•To set the parameters it is necessary to enter a secure menu.
This is done by entering a password number when
requested.
•To enter the parameter menus press [Tare] during initial
counting of the display after power is turned on. The
“WEIGHT” Display will show "PIn " requesting the
password number to be entered.
•The default password is "0000" but other numbers can be set
using the parameter menus.
•Press the [0] key four times when the display shows "PIn- - -",
Press the [Tare] key again.
•The following parameters can be accessed using the [M+]
key to cycle through the choices. The “UNIT WEIGHT”
display will show the name of the parameters. To enter a
parameter, press the [Tare] key. At any time press the [Zero]
key to return to weighing.
Display Description
F1 CAL See the calibration section for details.
F2 CAP Selects the scale capacity.
Scroll through the available options using the [M+] key. Press [Tare] to store
the value and return to menu.
F3 dISets the scale increment.
Press [Tare] to enter to menu. Press [M+] to show the options (5, 10 and 20).
Press [Tare] to accept the selection and return to menu.
F4 Cnt Displays the A/D counts.
Press [Tare] to see the count. Pressing it again will return to menu.
F5 PIn Sets a new password number. Press [Tare]. The “UNIT WEIGHT” display
will show "Pin1"
Enter the new password number then press [Tare].
Display will change to "Pin 2 ", Enter the password again and press [Tare].
The display will show "donE" to show the new password has been accepted
and will return to the menu. Record the new password in a secured place.
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F6 Prt Sets the RS-232. Press [Tare] to show the following sub-menus.
PbAUd-Select from the desired baud rates
Press [Tare] to see the earlier setting. Press [M+] to scroll through
the options (600, 1200, 2400, 4800 and 9600). Press [Tare] to
select the desired value and return to the sub-menu.
PnodE-Sets the printing mode to-
AU on (Print anytime a weight is placed on the scale).
AUoFF (Print whenever the [Print] key is pressed).
P Cont (Print continuously the unit weight, no. of pieces and the
total weight).
SEIrE (Continuously print the weight only)
Press [Tare] to select and return to the sub-menu.
PArity– Select from the following settings-
n 8 1-8 data bits, no parity
E 7 1-7 data bits, even parity
o 7 1-7 data bits, odd parity
Press [Tare] to select and return to the sub-menu.
Press [Zero] to return to the menu.
F7 SPd This is used to set the speed at which the scale will run the ADC. The settings
available are 7.5, 15, 30 and 60- the slowest setting being 7.5 and the fastest
is 60. Press [Tare] to select the desired value and return to the menu. Press
[Zero] to return to weighing.
NOTE: If the User Parameters cannot be accessed using the default
code “0000”, use the factory code. See section 7.0 for details on Factory
parameters.
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6.0 CFC USER CALIBRATION
•The CFC scales calibrate using metric weights and the CFCa
scales can calibrate using either metric or pound weights,
depending on the weighing unit in use before calibration.
•When the parameter menu shows "F1 CAL" press the [Tare]
key.
•The display will then show "unLoAd" requesting for all weights
to be removed from the platform and press the [Tare] key.
•The display will then show the last calibration weight
requested.
•If this weight is acceptable press the [Tare] key to accept it or
press [CE] to enter a new calibration weight using the keypad
and then press the [Tare] key. To calibrate at 100.00 Kg
simply type 10000. Do not type the decimal place.
•The display will show "LOAd". Place the calibration weight on
the scale and press the [Tare] key. The scale will calibrate
and then start the initial self-check procedure counting from 9
to 0. Remove the weight during the counting.
CFCa scales will also have the lb or kg indicator ON to show the denomination of the
weight requested. If the scale was in pounds before starting calibration, the weights
requested will be in pound values or if the scale was weighing in kilograms then
metric weights will be requested.
•If an error message “FAiL L” or “FAiL H” is shown in the
“WEIGHT” display during calibration, repeat the calibration. If
the problem persists then contact Adam Equipment or your
dealer for further assistance.
•After calibration, you should check whether the calibration
and the linearity are correct. If necessary repeat calibration,
ensure that the scale is stable before accepting any weight.
@Adam Equipment Company 2007
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7.0 CFC FACTORY PARAMETERS AND CALIBRATION
•To set the parameters it is necessary to enter a secure menu.
This is done by entering a password number when
requested.
•To enter the factory parameter menus press [Tare] during
initial counting of the display after power is turned on. The
“WEIGHT” Display will show "PIn " requesting the
password number to be entered.
•The password is "9999".
•Press the [9] key four times when the display shows "PIn- - -",
Press the [Tare] key again.
•The following parameters can be accessed using the [M+]
key to cycle through the choices. The “UNIT WEIGHT”
display will show the name of the parameters. To enter a
parameter, press the [Tare] key. At any time press the [Zero]
key to return to weighing.
Display Description
F1 CAL See the factory calibration section for details.
F2 CAP Selects the scale capacity.
Scroll through the available options using the [M+] key. Press [Tare] to store
the value and return to menu.
F3 dISets the scale increment.
Press [Tare] to enter to menu. Press [M+] to show the options (5, 10 and 20).
Press [Tare] to accept the selection and return to menu.
F4 Cnt Displays the A/D counts.
Press [Tare] to see the count. Pressing it again will return to menu.
F5 PIn Sets a new password number. Press [Tare]. The “UNIT WEIGHT” display
will show "Pin1"
Enter the new password number then press [Tare].
Display will change to "Pin 2 ", Enter the password again and press [Tare].
The display will show "donE" to show the new password has been accepted
and will return to the menu. Record the new password in a secured place.
@Adam Equipment Company 2007
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F6 Prt Sets the RS-232. Press [Tare] to show the following sub-menus.
PbAUd-Select from the desired baud rates
Press [Tare] to see the earlier setting. Press [M+] to scroll through
the options (600, 1200, 2400, 4800 and 9600). Press [Tare] to
select the desired value and return to the sub-menu.
PnodE-Sets the printing mode to-
AU on (Print anytime a weight is placed on the scale).
AUoFF (Print whenever the [Print] key is pressed).
P Cont (Print continuously the unit weight, no. of pieces and the
total weight).
SEIrE (Continuously print the weight only)
Press [Tare] to select and return to the sub-menu.
PArity– Select from the following settings-
n 8 1-8 data bits, no parity
E 7 1-7 data bits, even parity
o 7 1-7 data bits, odd parity
Press [Tare] to select and return to the sub-menu.
Press [Zero] to return to the menu.
F7 SPd This is used to set the speed at which the scale will run the ADC. The settings
available are 7.5, 15, 30 and 60- the slowest setting being 7.5 and the fastest
is 60. Press [Tare] to select the desired value and return to the menu. Press
[Zero] to return to weighing.
@Adam Equipment Company 2007
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7.1 FACTORY CALIBRATION
•The CFC scales calibrate using metric weights and the CFCa
scales can calibrate using either metric or pound weights,
depending on the weighing unit in use before calibration.
•When the parameter menu shows "F1 CAL" press the [Tare]
key.
•The display will then show "unLoAd" requesting for all weights
to be removed from the platform and press the [Tare] key.
•The display will then show the last calibration weight
requested.
•If this weight is acceptable press the [Tare] key to accept it or
press [CE] to enter a new calibration weight using the keypad
and then press the [Tare] key. To calibrate at 100.00 Kg
simply type 10000. Do not type the decimal place.
•The display will show "LOAd". Place the calibration weight on
the scale and press the [Tare] key. The scale will calibrate
and then start the initial self-check procedure counting from 9
to 0. Remove the weight during the counting.
CFCa scales will also have the lb or kg indicator ON to show the denomination of the
weight requested. If the scale was in pounds before starting calibration, the weights
requested will be in pound values or if the scale was weighing in kilograms then
metric weights will be requested.
•Factory Calibration sets the span value against which the
User Calibration is checked with. So, ensure the entered data
and the weights used are correct.
•After calibration, you should check whether the calibration
and the linearity are correct. If necessary repeat calibration,
ensure that the scale is stable before accepting any weight.
@Adam Equipment Company 2007
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8.0 LOAD CELL DAMAGE
The most common reason a scale fails is that the load cell has been
damaged. The damage can be from 2 primary causes. The first is
physical damage due to an overload or a impact from the side and the
second is damage due to the environment, such as moisture, extreme
heat or a cut cable if the cables are exposed.
PRINCIPLE OF OPERATION
The strain gauge load cell is a method of measuring the amount of stress
put onto a metal structure due to a weight being supported by the
structure. The stress is measured using 4 strain gauge sensors mounted
in a particular way on the metal structure.
These 4 strain gauges are connected in such a way that they form a
wheatstone bridge. See figure below. In the simplest load cells there
are only the 4 resistances of the strain gauges to consider. Normally
without a load on the load cell all the resistances are the same. However
when the load cell has a weight on it 2 of the strain gauges will be in
compression (A and D) and the resistance will decrease and 2 will be in
tension (B and C) and their resistance will increase.
350 ohm
350 ohm
350ohm
350ohm
AB
CD
+E
-S
-E
+S
BALANCED BRIDGE
10 VOLT POWER
SUPPLY
Vout = O VOLTS,
BETWEEN +S AND -s
351ohm
349ohm
351ohm
349ohm
AB
CD
+E
-S
-E
+S
UNBALANCED BRIDGE
FULL CAPACITY LOAD
ON THE LOAD CELL
10 VOLT POWER
SUPPLY
Vout = 0.028 VOLTS (28mv),
BETWEEN +S AND -s
This will cause the bridge to become unbalanced. When the bridge has
a voltage across it from +E to -E then the signal output at +S and -S will
show a voltage of zero volts with no load and a small voltage
proportional to the load as the load is increased. Typical load cells show
20-30mv of signal if the excitation voltage is 10volts and the load cell is
fully loaded.
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Most load cells used in scales are not as simple as this example. They
have additional resistance elements added to compensate for
temperature variations and to set the outputs to correct voltages. The
circuit of a typical load cell is shown below.
350 ohm
350 ohm
350ohm
350ohm
AB
CD
lowohm
lowohm
temperature
correction
temperature
correction
+E
-S
-E
+S
BALANCED BRIDGE
10 VOLT POWER
SUPPLY
Vout = O VOLTS,
BETWEEN +S AND -s
A method to check the basic function and integrity of a load cell can be
done using an ohmmeter and voltmeter with up to a 10volt power supply.
Before the load cell is connected to the power supply use the ohmmeter
to measure the resistance between the wires. Typical resistance values
are:
+E to -E 410 ohms ±30 ohms
+S to -S 350 ohms ± 2 ohms
+E to +S or any other combination similar approximately 270 ohms.
If the load cell has Sense connections in addition they are connected to
the excitation internal to the load cell.
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Connect the load cell +E and -E to a power supply, typically 10 volts.
Never use more than 12 volts as it may damage the load cell.
Measure the voltage between +S and -S.
With no load the voltage should be approximate 0mv ±3mv.
With a mass on the load cell the output voltage should increase. The
amount it increases will be dependent upon the sensitivity of the load
cell, capacity of the load cell, the excitation voltage and the amount of
mass placed on the load cell. Most load cells have a sensitivity of either
2mv/V or 3mv/V.
The expected change to the output is:
Vout = (2mv/V) * Vext * Mass
capacity of load cell
For example a 2mv/V load cell of 30Kg capacity with 20Kg placed on it.
Vext is 5 volts would give a output of approximately:
Vout =
(2mv/V) * Vext * Mass = 2mv/V * 5V * 20Kg = 6.7mv
capacity of load cell 30kg
If the load cell has been damaged the no load voltage will likely be
greater than 3mv or the loaded voltage will be grossly different from the
expected value. Remember the loaded voltage will be offset by the
amount of zero load voltage measured.
The load cell can be tested while it is connected to the A/D converter
circuit board, using the scale power supply for excitation voltage.
9.0 REPLACEMENT PARTS AND ACCESSORIES
If you need to order any spare parts and accessories, contact your supplier or
Adam Equipment. A partial list of such items is as follows-
•Power Supply Adapter
•Replacement Battery
•Stainless Steel Pan
•In use cover
•Printer, etc.
•Leveling Foot
@Adam Equipment Company 2007
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10.0 SCHEMATICS
CFC Parts List
Diagram
Number Description Qty Used
1 Screw 2
2 Washer 2
3 Battery 1
4 Nut 1
5 Back Cover 1
6 Washer 5
7 Screw 5
8 RS-232 1
9 Load Cell Connector 1
10 Serial Number Overlay 1
11 Part 1 of Fixing Head Bracket 1
12 Part 2 of Fixing Head Bracket 1
13 Part 3 of Fixing Head Bracket 1
14 Nut M6x3.5 1
15 Upper Bracket of Load Cell 1
16 Load Cell 100kg 1
16 Load Cell 200kg 1
16 Load Cell 500kg 1
16 Load Cell 750kg 1
17 Pole 1
18 Bottom Bracket of Load Cell 1
19 Screw M6x8 3
20 Base to Pole Bracket 1
21 Base Washer of Pole 1
22 Washer 3
23 Screw M8x12 3
24 Foot 4
25 Protection Screw M8x14.5 1
26 Even Washer 4
27 Spring Washer 4
28 Screw M8x40 4
29 Stainless Steel Pan 1
30 Part 4 Fixing Head 1
31 Screw 1
32 Adaptor AC 9V-600MA 1
33 Washer 1
34 Screw M3x20 1
35 Battery Bracket 1
36 Main PCB 1
37 Upper Cover 1
38 Keyboard 1
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WARRANTY INFORMATION
Adam Equipment offers one year Limited Warranty (Parts and Labour) for the
components failed due to defects in materials or workmanship. Warranty starts
from the date of delivery.
During the warranty period, should any repairs be necessary, the purchaser must
inform its supplier or Adam Equipment Company. The company or its authorised
Technician reserves the right to repair or replace the components at any of its
workshops depending on the severity of the problems. However, any freight
involved in sending the faulty units or parts to the service centre should be borne
by the purchaser.
The warranty will cease to operate if the equipment is not returned in the original
packaging and with correct documentation for a claim to be processed. All claims
are at the sole discretion of Adam Equipment.
This warranty does not cover equipment where defects or poor performance is
due to misuse, accidental damage, exposure to radioactive or corrosive materials,
negligence, faulty installation, unauthorised modifications or attempted repair or
failure to observe the requirements and recommendations as given in this User
Manual.
Repairs carried out under the warranty does not extend the warranty period.
Components removed during the warranty repairs become the company property.
The statutory right of the purchaser is not affected by this warranty. The terms of
this warranty is governed by the UK law. For complete details on Warranty
Information, see the terms and conditions of sale available on our web-site.
@Adam Equipment Company 2007
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