Adam Equipment CBD Series User manual

Adam Equipment
CBD SERIES
SERVICE MANUAL
ADAM EQUIPMENT CO. LTD.
P.N. 7951, Rev. A1, March 2007
@Adam Equipment Company 2007

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@Adam Equipment Company 2007
CONTENTS
1.0 INTRODUCTION............................................................................................................2
2.0 TROUBLE SHOOTING GUIDE......................................................................................3
3.0 ERROR CODES ............................................................................................................4
4.0 CBD DESCRIPTION......................................................................................................4
5.0 SETTING UP THE REMOTE SCALE ............................................................................5
6.0 USER PARAMETERS ...................................................................................................7
7.0 USER CALIBRATION....................................................................................................9
8.0 TECHNICAL PARAMETERS.......................................................................................10
9.0 LOAD CELL DAMAGE.................................................................................................12
10.0 REPLACEMENT PARTS AND ACCESSORIES..........................................................15
11.0 SCHEMATICS..............................................................................................................15

1.0 INTRODUCTION
The CBD series of scales are general purpose counting scales.
Refer to the Operators Manual for details of 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 provide further assistance, the supplier will need the following
information which should be kept ready:
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:
CBD_____
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 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.
4.0 CBD DESCRIPTION
The CBD scales have an enclosure with all components mounted within it. To
gain access to the components remove the 4 screws securing the cover to the
base.

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The basic unit consists of:
9Base
9Load Cell frame
9Power switch
9Main PCB assembly
9Battery
9Display PCB assembly
9Keypad
All models of CBD 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.
Schematics are attached in order to complete the documentation. However it is
rare that the problem due to a faulty component on the PCB is traced by a user.
The main PCB assembly includes:
9A/D converter (AU1),
9Microprocessor (DU1) and
9Power supply/battery charger circuits (DU5, T2).
5.0 SETTING UP THE REMOTE SCALE
The CBD Series can be connected to any size of load cell type weighing base
via the Remote scale port on the right side of the scale case. Ensure you have
the correct base for the scale as each is matched for calibration.
Place the remote scale platform in the position where it is to be used. Level the
scale by adjusting the four feet. If fitted with a spirit level then it should be
adjusted such that the bubble is in the centre.
Press [Local/Rem] and test weighing performance.
REMOTE SCALE CONNECTION
The cable for the load cell goes to a 9 pin D-subminiature plug connector with
the following connections:

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Pin numbers Connection
Pins 1,2 - Excitation (0v)
Pins 4,5 + Excitation (+5v)
Pin 7 + Signal
Pin 8 - Signal
(The sense wires connections of a six wire load cell are not used but can be
connected to the respective Excitation pins).
REMOTE SCALE SET UP
The remote scale should set for a realistic resolution with respect to the input
provided by the load cell/s.
If a single 2mV/V load cell is fitted and more than 60% of the load cell is used for
full capacity then the high output of >6mV span makes it possible to set a high
resolution.
If this criterion is met then the remote scale can be set to a high resolution with a
maximum of 1:30,000, i.e. 300kg x 10g.
It will also be possible to sample on the remote scale with the same accuracy as
the Local.
Where more than one load cell is fitted or the total load cell capacity is not
utilised then a reduced resolution should be selected in the remote scale
technical set up. For example, if a system uses four 2mV/V 1000kg load cells for
a scale of 1000kg capacity then the span output at full scale will be only 2.5mV.
In this situation the resolution should be reduced to give a good number of ADC
counts per displayed division. ie. Set to 1:5000 or 1000kg x 0.2kg.
Setting a high resolution without providing a good input to the remote scale ADC
will not give better accuracy and may make the scale difficult to meet
performance specification.
For best performance ensure a minimum of 0.1µV/d.

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6.0 USER PARAMETERS
Enter the User Parameters section by pressing the [Pst] key during the self-test
when the power is turned on. This will allow the user to set the way he wants the
scale to work by choosing specific values from some options.
Press the [U.Wt./Units] key to scroll through the other parameters. To enter any
parameter, press the [Print] key.
Press [U.Wt./Units] to scroll through the sub-parameters. To see the earlier
setting, press the [Print] key. To change and scroll through the other available
settings, press [U.Wt.]. To choose the desired setting and thereby go back to
the sub-parameter, press the [Print] key.
To return to the parameter, press the [Tare/Zero] key.
PARA-
METER SUB-
PARAMETER DISPLAYS AND SETTINGS
“bEEP"“ "oFF"” Beeper is set to off
“bEEP"” "onIn"” Beeper is set to on
between limits
bEEP
“bEEP” “"on oUt”” Beeper is set to on
outside limits (>0)
“LitE"” “"oFF"”
Backlight is set to off
“LitE"” "on"” Set to on at all times
EL
“LitE"” "AUt" Set to work automatically
when a weight is placed
on the scale or a key is
pressed.
“UnIt” ”KG/Lb”
Kg/Lb both are enabled
F1oFF
UnIt
”UnIt” “KiLo” Kg only is enabled

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”UnIt” “Lb” Lb only is enabled
Print AuoFF Prints only wh
the Auto-
Accumulation is
set to off.
en
Auon Prints only when
the Auto-
Accumulation is
set to on.
PCont Sets the RS-232 interface
to print continuously and
the accumulation function
is disabled.
PModE
SErrE Sets the RS-232 to print
continuously the weight
only.
PbAUd b 600
b 1200
b 2400
b 4800
b 9600
Sets the required baud
rate (speed for the RS-
232 communications).
Default rate is 4800.
F2Prt
PAritY 8 n 1
7 E 1
7 o 1
8 data bits, no parity
7 data bits, even parity
7 data bits, odd parity
U id “Uid”
“ Abc234”
“ “
Shows the current user ID (if any).
Enter a new User ID as described in the Description
under the PLU section. The ID can be alpha-
numeric but is limited to 6 characters.
SCid “Scid”
“ Abc234”
“ “
Shows the current scale ID (if any).
Enter a new Scale ID as described in the
Description under the PLU section. The ID can be
alpha-numeric but is limited to 6 characters.
tECH Allows access to the Technical parameters using a
password. Not normally accessed by user.

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7.0 USER CALIBRATION
ACTION DISPLAYS
Press the [Tare/Zero] key during the
self-test at power on. The scale will
ask to enter the password.
“Pin”
Default Password is 0000.
Enter “0” four times.
Password can be changed in technical
parameters.
Press [Print].
“Pin” “----”
Select the scale to be set up by using
the [Local/Remote] key.
Press the [Print] key to enter the
technical section.
“tEch” “ LocAL” “ “
“tEch” “rEmotE” “ “
Use the [U.Wt.] to select the weighing
unit to be used for setting of the
calibration. The arrow in the “Weight”
window will indicate the unit selected.
Press the [Print] key to continue.
“tEch” “ Unit” “ “
You will enter the first parameter -
Calibration. Display will ask to unload
any weight on the platform.
Press the [Print] key to continue.
“UnLoAd”
Enter the calibration weight to be
loaded and press [Print].
Load the calibration weight onto the
scale and press [Print] again.
The Calibration is complete, the scale
will run the self-test during which the
weight should be removed.
“SEL” “0010”
“LoAd”

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8.0 TECHNICAL PARAMETERS
The technical parameters are accessed via the “tEch” prompt at the end of user
parameters and are password controlled to prevent unauthorised access.
These parameters set the metrology for the scales. Each scale is set
independently. The parameters will set capacity, division, decimal point position,
initial zero range, auto and manual zero range as well as factory calibration.
ACTION DISPLAYS
From the “tech” user parameter, Press
the [Print] key. The scale will ask you
to enter the password.
“Pin”
Default Password is 0000.
Enter “0” four times.
9999 will override any other user
password. Press [Print].
“Pin” “----”
Select the scale to be set up by using
the [Local/Rem] key.
Press the [Print] to enter the technical
section for that scale.
“tEch” “ LocAL” “ “
“tEch” “rEmotE” “ “
Use the [U.Wt./Units] to select the
weighing unit to be used for setting up
the parameters for the scale. The
arrow in the “Weight” window will
indicate the unit selected.
Press the [Print] key to continue.
“tEch” “ Unit” “ “
Press the [U.Wt./Units] key to scroll
through the menus for the chosen
scale. User [Print] to select and set
parameters and the
[Tare/Zero] to escape as without
changing data as with the user
parameter section.
“Cnt”
Both scales have the same menus
except that the capacity of the local
scale is fixed and cannot be
entered.
Press the [U.Wt/Unit] to go to next
menu. Press [Print] to enter.

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Use [U.Wt/Unit] to select the decimal
point position and press [Print].
To change the remote scale cap press
CE to clear and then enter new value
followed by [Print].
“CAp”. Scale capacity setting.
“dESC”“ 0.00”
“SEL”“0060”
Press the [U.Wt/Unit] to go to next
menu. Press [Print] to enter.
Use [U.Wt/Unit] to select the division
which you would like the display to
increment in followed by [Print].
“div” weighing division.
“inc 5”
Press the [U.Wt/Unit] to go to next
menu, use [Print] key to enter.
Use [U.Wt/Unit] to increment the
values then [Print].
“Azt” Autozero tracking range.
Select from 0.5d,1d,2,4,d
Press the [U.Wt/Unit] to go to next
menu, use [Print] key to enter.
Use [U.Wt/Unit] to increment the
values then [Print].
“0Auto” Zero auto range at
power on.
Select form 0%,2%,5%,10%or 20%
Press the [U.Wt/Unit] to go to next
menu, use [Print] key to enter.
Use [U.Wt/Unit] to increment the
values then [Print].
“0 manl” Zero manual range.
Select form 0%,2%,4%,10%,50%or
100%
Press the [U.Wt/Unit] to go to next
menu, use [Print] key to enter.
Enter the new PIN number and press
[Print].
Confirm the new PIN number and
press [Print].
“Pin” Password number for “tEch”.
“Pin1”
“Pin2”
“donE”
Press [U.Wt./Units] to continue or
escape the parameters with the
[zero/Tare]

9.0 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 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, two of the strain gauges will be in compression (A and D) and the
resistance will decrease and two 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.
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.
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With a mass on the load cell the output voltage should increase. The amount of
increase will depend 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.
TESTING LOAD CELLS IN THE SCALE
The signal from the load cells is amplified by the circuits on the A/D circuit
board.
The signal needs to be amplified to make it acceptable for the A/D converter
used. The CBD/CBW scales amplify the input by 200, and change the no load
voltage to about +2.5V.
The amplified and offset voltage is measured at pin 6 of IC7, the INA118P
amplifier IC. This voltage is sent to the filter and then to the A/D converter.

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10.0 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 Module
•Main Power cord
•Replacement Battery
•Stainless Steel Pan
•In use cover
•RS-232 option
•Printer, etc.
11.0 SCHEMATICS
The following schematics are included as a guide for the experienced Service
Technician. If you are not experienced we do not advice you to change parts on
the circuit boards or otherwise disturb the electronics.
If you require assistance please contact your dealer or Adam Equipment. We
will be happy to help you resolve problems or determine the cause of a problem
if you send us a full description of the scale and the problem.

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CBD Parts List
Part Number Revision Diagram
Number
Description Qty
Used
1.0001 1 Stainless Steel Pan 1
1.0002 2 ABS Pan 1
1.0044 3 Front Overlay 1
1.0045 4 Keyboard 1
1.0004 5 Upper case 1
0.0026 6 Screw M6 x 20 2
1.0025 7 Upper Bracket of Load Cell 1
1.0026 8 Load Cell 1
0.0013 9 Screw M4 x 20 4
1.0046 10 Washer 4
1.0027 11 Bottom Bracket of Load Cell 1
0.0008 12 / 28 Screw M4 x 12 4
1.0047 13 Washer 4
1.0048 14 Main PCB 1
1.0022 15 Display PCB
1.0011 16 Bottom Cover 1
0.0011 17 Case screw M4 x 15 5
1.0049 18 Serial Port RS-232 1
1.0050 19 Duel Scale connector 1
1.0032 20 Power Switch 1
1.0012 21 Foot 4
0.0003 22 Screw M3 x 10 4
0.0013 23 Screw M4 x 20 4
1.0014 24 Battery Cover 1
1.0051 25 Internal Transformer (SA only) 1
1.0052 26 Nut 1
1.0057 27 Serial PCB board 1
0.0008 28 / 12 Screw M4 x 12 4
1.0010 29 Battery (6V / 4MH) 1
1.0024 30 / 31 Washer 2
1.0003 32 Rear Overlay 1
0.1003 AC Adapter 9VDC 800mA-1A 1
0.5006 In use wet cover

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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 the purchaser’s site or any of its workshops depending on
the severity of the problems at no additional cost. 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.