Adam CFW Series User manual

Adam Equipment
CFW SERIES
SERVICE MANUAL
ADAM EQUIPMENT CO. LTD.
P.N. 7953, Rev. A2, February 2007
@Adam Equipment Company 2007

@Adam Equipment Company 2007

CONTENTS
1.0 INTRODUCTION ............................................................................................. 4
2.0 TROUBLE SHOOTING GUIDE ....................................................................... 5
3.0 ERROR CODES.............................................................................................. 6
4.0 CFW DESCRIPTION....................................................................................... 7
5.0 CFW USER PARAMETERS............................................................................ 8
6.0 CFW USER CALIBRATION............................................................................11
7.0 FACTORY PROGRAMMING AND CALIBRATION.........................................12
8.0 LOAD CELL DAMAGE....................................................................................14
9.0 REPLACEMENT PARTS AND ACCESSORIES.............................................17
10.0 SCHEMATICS ................................................................................................18
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1.0 INTRODUCTION
The CFW series of scales are general purpose weighing 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
PROBLEM POSSIBLE CAUSE
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)
Processorfailure
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3.0 ERROR CODES
ERROR
CODES
DESCRIPTION SUGGESTIONS
--oL-- Over-range Remove weight from the scale.
If the problem persists contact your dealer or Adam
Equipment for assistance.
Err1 Date Setting Error Enter date using correct format and reasonable
values. Format: yy:mm:dd
Err2 Time Setting Error Enter time using correct format and reasonable
values. Format: hh:mm:ss
Err4 Zero Setting Error The scale was outside the normal zero setting range
either when it was turned on or when the [Zero] key
was pressed.
Remove weight from the scale and try re-zeroing
again.
Use the [Tare] key to set the display to zero value.
If the problem persists contact your dealer or Adam
Equipment for assistance.
Err6 A/D out of range The values from the A/D converter are outside the
normal range.
Remove the weight from the scale if overloaded.
Make sure the pan is attached.
Indicates the load cell or the electronics may be faulty.
If the problem persists contact your dealer or Adam
Equipment for assistance.
FAILHor
FAILL Calibration error. Improper calibration (should be within +10% of the
factory calibration). The old calibration data will be
retained until the calibration process is complete.
If the problem persists contact your dealer or Adam
Equipment for assistance.
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4.0 CFW DESCRIPTION
The CFW 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 includes:
Load cell
Pan
Load Cell frame
Transformer / External adapter
Main PCB assembly with display
Battery
Keypad
All models of CFW are similar except the selection of load cells and the
program.
The main circuit board is similar to that used in the CFC scales.
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 (U5, T2)
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5.0 CFW USER PARAMETERS
•The scale has 7 User Parameters that can be set by the user.
To set these Parameters press the [Func] key. The display
will show the first parameter, "F0H-L".
•Pressing the [Tare/Ï]will cycle through the other
parameters.
•Pressing [Zero/Enter] will allow you to enter a parameter
directly for setting or further enter a sub-parameter. Press the
[Print/Esc] key to leave the parameter unchanged.
•For setting a new value for the parameter or a sub-
parameter, first enter the parameter or sub-parameter by
pressing the [Zero/Enter] key. Then use the [Pcs/Í]key or
the [Units/Î] key to move the active/flashing digit to the left
or to the right and use the [Tare/Ï]key to increment the
flashing digit. Press the [Zero/Enter] key to enter the
changed value.
•Use the [Print/Esc] key to leave the parameter.
For example,
When the display shows “F0H-L”, press the [Zero/Enter] key.
The display will show “SEt Lo” (the sub-parameter). Press
[Zero/Enter] to set the low limit or press the [Tare/Ï] to skip
to “SEt Hi” for setting the high limit. When all digits have been
set, press [Zero/Enter] to store the value. Display will go
back to the sub-parameter just set, i.e. “SEtLo” or “SEtHi”.
Press [Print/Esc] to return to “FOH-L”.
Advance to the next parameter (F1toL) by pressing [Tare/Ï] if
needed or press [Print/Esc] to return to weighing.
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SETTING OF USER PARAMETERS
PARAMETER SUB-
PARAMETER DESCRIPTION DEFAULT VALUE
SEtLo Sets a value for the Low Limit used for
checkweighing.
000.000F0H-L
SEtHI Sets a value for the High Limit for
checkweighing.
000.000
toCLr Clears the Accumulation Total in the
memory without printing the results.
toP-C Prints the Accumulation Total in the
memory and then clears the memory.
F1toL
toPrt Prints the Accumulation Total in the
memory but does not clear the memory.
F2unt Ut oFF
Ut on Enables or disables the weighing units.
Use the [Zero/Enter] key to select the
weighing unit to enable/disable. Use the
[Tare/Ï]to change the unit to ON or OFF.
SEtdA Sets the date, Display will show the last
date set or 00.01.01. Enter the new date,
format is yy.mm.dd
F3tI
SEttI Sets the time, Display will show the
current time Enter the new time, format is
hh.mm.ss
CLoCK Sets clock to OFF or ON as screen saver.
CLKoF
CLKon
CLKoFF4oFF
bL Sets the backlight to be on, automatic or
off
ELon
ELAu
ELoFF
ELAu
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bEEP Sets the beeper to-
1(off all the time),
2(ON when the weight is OK, i.e., in
between LO and HI limits) or
3(ON only when the weight is outside the
limits during the check-weighing function).
This setting does not affect the beeper
during normal weighing.
bP2
F5Prt PbAUd
Pnode
Parity
Sets the RS-232 -
Select from the desired baud rates.
Options are 600, 1200, 2400, 4800
and 9600
Set the printing mode to-
PPrt(Print only when [Print] is
pressed)
PCont(Print continuously)
PAuto (Print automatically whenever
there is any weight on the scale).
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
4800
PCont
n 8 1
ProG Pin See the SERVICE SECTION for details.
•Use the [Print/Esc] key to leave the set-up mode of the
parameter and return to weighing.
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6.0 CFW USER CALIBRATION
The scale can be calibrated using the following procedure. For a more
detailed method of calibrating the scale, it will be necessary to enter the
secure Programming Menu. Refer to the CFW Service Manual for more
information.
CFWa Scales only:
CFWa scales will also have the lb, oz, lb-oz or kg (or g) indicator on to show the unit
of the weight requested. If the scale was in pounds before starting the calibration,
the weights requested will be in pound values. If the scale was weighing in kilograms
then metric weights will be requested.
PROCEDURE
•Turn the power off.
•Turn the power back on, during the counting from 1 to 0, press
[Func/C].
•The display will show "CAL ". While it is showing "CAL " press the
[Unit], [Print] and [Tare] keys in sequence to enter the Calibration
section. The display will show "unLoAd".
•Remove any weight from platform when stable and press
[Zero/Enter].
•The display will show the last calibration weight used. If this is
correct you can continue by pressing [Zero/Enter]. If it is not
correct use the arrow keys to change the calibration weight value.
When it is correct press [Zero/Enter].
•The display will show "LoAd". Place the calibration weight on the
scale. Press the [Zero/Enter] key.
•If the calibration is acceptable the scale will run a self-test during
which the calibration weight should be removed. If an error
message “FAiL L” is shown try calibration again as a disturbance
may have prevented a successful calibration.
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After calibration the scale should be checked for whether the calibration
and linearity is correct. If necessary repeat calibration, make sure that
the scale is stable before accepting any weight.
7.0 FACTORY PROGRAMMING AND CALIBRATION
•The parameter “PROG” allows access to the calibration section. To
enter this parameter press [Func] and then press [Tare/Ï] until
"PROG" is displayed.
•Press [Zero/Enter] when “PROG” is displayed to show " PIn ",
requesting for the security password.
•Press the [Units], [Func] and [Print] keys in sequence to enter the
Programming/ Calibration menu. The display will show "P1 rEF".
Press [Zero/Enter] to set the functions of “P1 rEF”.
•The Programming Parameter “PROG” has a number of sub-
parameters that allow the scale to be customised for the
application. The “P1 rEF” sub-parameter includes many functions
that can affect the metrology of the scale. These functions should
not be reset to other values unless you understand the affect it may
have on the scale.
SETTING OF SERVICE PARAMETERS
SUB-
PARAMETER FUNCTIONS DESCRIPTION DEFAULT SETTING
P1 rEF AZn 0 Auto Zero operating range.
(Options: 0.5d, 1.0d, 2d, 4d)
Sets the operational range of the auto
zero function.
1d
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0-Auto Initial Zero range at power on.
(Options: 0%, 2%, 5%, 10% and 20%)
Sets the range for setting a zero when
power is applied. The total capacity of the
scale will not be affected by the new zero
if it is set within 10%. If it is set to a higher
value, the scale may zero but the range
may be limited by load cell, A/D converter
or mechanical stops within the base.
P1 10
(10%)
0-rAnG Zero range when [Zero] is pressed.
(Options: 4%,10%, 20%, 50%,100%)
Sets the range for setting a zero when
[Zero] is pressed. The total capacity of
the scale will not be affected by new zero
if it is set within 10%. If it is set to a higher
value, the scale may zero but the range
may be limited by load cell, A/D converter
or mechanical stops within the base.
P2 10
(10%)
SPEEd Sets the display update speed.
(Options: 7.5, 15, 30 or 60).
SPd 15
The P2CAL sub-parameter has the basic functions used by the scale to set
the capacity, decimal point position, increment size as well as the
calibration procedures. Do not change the weighing functions as the
scales may not perform as specified. Either the capacity will be wrong,
the decimal point will be in the wrong position or the scale will increment
with values that are not as specified for the scales.
dEC1 Selects the decimal point position
(Options: 0, 0.0, 0.00, 0.000).
C 0.00
InC Selects the increment size.
(Options: 1, 2, 5 and 10).
inC 10
CAP Sets the scale capacity. The maximum value
for the scale is as specified for the scale. For
example 60kg.
P2CAL
CAL Starts the calibration procedure. See the
details of calibration procedure in section 10.
The sub-parameter “P3 Pro” is used to view the calibration constant used
by the scale, view the A/D counts and set the scale back to default
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settings. This is useful if it is not possible to have a good calibration of a
scale. It will show the load cell is causing the A/D to increment correctly
through the complete range of weights needed and you can recall the
default settings for the scale. The “trl” value can be modified to cause
the scale calibration to change to a known amount without the need for
putting weights on the scale.
trl Display will show a value that corresponds to
the load cell calibration. If the value is
increased the scale calibration will be
decreased a similar percentage.
CoUnt Display will show the counts from the A/D
converter. The displayed count should
increase as the weight is added to the load
cell up to and exceeding the capacity of scale.
Typical range for these counts are:
No load 20,000
Maximum 120,000
P3Pro
rESEt Scale will reset to factory default settings.
Press [Zero/Enter] to continue or [Print/Esc]
to abort.
•Once the value is set, use [Print/Esc] to return to sub-parameter.
•Pressing [Print/Esc] again will return the scale to normal weighing.
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 an 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 stain gage 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 gage sensors mounted
in a particular way on the metal structure.
These 4 strain gages 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 gages to consider. Normally
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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 gages 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
350ohm
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.
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.
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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.
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
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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 Feet
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10.0 SCHEMATICS
CFW PARTS LIST
NO PARTS NAME QTY MATERIAL SPEC
1 key panel 1
2 indicator front cover 1 ABS
3 CFC/CFW main PCBA 1
4 insulation washer 6 EPDM
5 self thread screw 4 S18C M4x8
6 self thread screw 4 S18C M3x10
7 washer 2 SPCC 8.8x4.5
8 battery bar 1 SPCC
9 battery 1 lead acid 6v/4Ah
10 indicator bottom cover 1 ABS
11 self thread screw 6 S18C M4x20
12 AC adapter jack 1
13 air connector 1 5P
14 indicator bracket parts1 1 ABS
15 indicator bracket parts2 1 ABS
16 indicator bracket parts3 1 ABS
17 nut 1 S18C M6
18 washer 1 SPCC 11.8x7.5
19 hexagon screw 1 S18C M6x20
20 pan 1 SUS304 420mmx520mm
21 internal hexagon screw 8 S18C M8x30
22 spring washer 8 S18C 14x8.5
23 internal hexagon screw 4 S18C M8x50
24 load cell upper bracket 1 AL
25 load cell 1 AL
26 pole 1 SUS304 38x660
27 screw 2 M4x6
28 cable clamp 2
29 load cell lower bracket 1 AL
30 level bubble 1 14.7mm
31 internal hexagon screw 1 S18C M8x20
32 "-" screw 2 S18C M6x8
33 internal hexagon screw 5 S18C M6x20
34 spring washer 5 S18C 10x6.5
35 Base to pole bracket 1 AL
36 washer 4 SPCC
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37 Base to pole bracket cover 1 AL
38 "+" screw 1 M6x8
39 foot 4
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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.
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