Adam Equipment QBW Series User manual

Adam Equipment
QBW Scale
SERVICE MANUAL
ADAM EQUIPMENT CO. LTD.
p.n. 6064, Rev. A, June 2005
@Adam Equipment Company 2004

@Adam Equipment Company 2004

CONTENTS
INTRODUCTION.................................................................................................................2
SPECIFICATIONS...............................................................................................................2
SCALE RANGES AND RESOLUTIONS..............................................................................2
TROUBLE SHOOTING GUIDE ...........................................................................................4
DISPLAY AND KEYS...........................................................................................................5
POWER...............................................................................................................................5
ZERO / TARE......................................................................................................................6
WEIGHING UNITS SELECTION.........................................................................................7
CALIBRATION.....................................................................................................................7
USER SETUP PARAMETERS ............................................................................................8
FUNCTION OF THE KEYS..............................................................................................8
BUZZER ON/OFF ............................................................................................................9
AUTO SWITCH-OFF TIME..............................................................................................9
ENABLED UNITS...........................................................................................................10
VIEWING ADC COUNTS...................................................................................................10
LOADING DEFAULTS.......................................................................................................10
ERRORS ...........................................................................................................................11
QBW HARDWARE OVERVIEW........................................................................................12
QBW ASSEMBLY..............................................................................................................16
LOAD CELL ASSEMBLY...................................................................................................19

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INTRODUCTION
•The QBW series of scales are simple, easy to use scales with an internal
rechargeable battery.
•The weighing process is fast and accurate, making it suitable for general purpose
weighing applications.
•There are 5 models in this series with capacities ranging from 1.5 kilograms to 30
kilograms.
•All have stainless steel weighing platforms on an ABS plastic base assembly.
•Keypads are sealed, with colour coded membrane switches.
•The displays are large, easy to read liquid crystal type displays (LCD).
•The LCD normally shows the weight and the previously-selected units of the weight
(Grams, Kilograms, Ounces, Pounds or Pounds & Ounces).
SPECIFICATIONS
Operating temperature 0ºC TO 40ºC
32ºF TO 104ºF
Battery Internal Rechargeable Battery
(approx. 150 hours Operation)
Power Supply Adapter 9 VAC, 500mA
Applications General Purpose Weighing Scale
Stabilisation Time 2 seconds typical
Calibration Manual External
Display 4 and 1/2 Digits LCD Display
Balance Housing ABS Plastic, Stainless Steel Platform
Pan Size 225 X 275 mm (8.9” X 10.8”)
Dimensions ( W X D X H) 315 x 355 x 110 mm (12.4”X14”X4.3”)
Gross weight Approx. 4.0 Kg (8.8 lb.)
SCALE RANGES AND RESOLUTIONS
5 different ranges and resolutions are available for the scale, depending on the weighing
range of the load cell fitted and its associated software.
The ranges and resolutions for each capacity in all the available units are shown in the
following tables:

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N
SCALE RANGE = 1.5 kilograms
SELECTED
UNITS FULL SCALE DISPLAY RESOLUTIO DISPLAY
Grams 1500.0 g
1500,0g 0.5 g 0,5g
Kilograms 1.500 kg 1,500kg 0.001 kg 0,001kg
Ounces 52.90 oz
52,90oz 0.02 oz 0,02oz
Pounds 3.306 lb
3,306lb 0.002 lb 0,002lb
Pounds & Ounces 1 lb15.9 oz* 1_15,9lb-oz 0.1 oz _0,1lb-oz
SCALE RANGE = 3 kilograms
SELECTED
UNITS FULL SCALE DISPLAY RESOLUTIO
N DISPLAY
Grams 3000 g
3000g 1 g 1g
Kilograms 3.000 kg
3,000kg 0.001 kg 0,001kg
Ounces 105.80 oz
105,80oz 0.05 oz 0,05oz
Pounds 6.615 lb
6,615lb 0.005 lb 0,005lb
Pounds & Ounces 6 lb 10 oz 6_10lb-oz 1 oz 0_1lb-oz
SCALE RANGE = 6 kilograms
SELECTED
UNITS FULL SCALE DISPLAY RESOLUTIO
N DISPLAY
Grams 6000 g
6000g 2 g 2g
Kilograms 6.000 kg
6,000kg 0.002 kg 0,002kg
Ounces 211.6 oz
211,6oz 0.1 oz 0,1oz
Pounds 13.23 lb
13,23lb 0.01 lb 0,01lb
Pounds & Ounces 13 lb 4 oz 13_4lb-oz 1 oz 0_1lb-oz
SCALE RANGE = 15 kilograms
SELECTED
UNITS FULL SCALE DISPLAY RESOLUTIO
N DISPLAY
Grams 15000 g
15000g 5 g 5g
Kilograms 15.000 kg
15,000kg 0.005 kg 0,005kg
Ounces 529.0 oz
529,0oz 0.2 oz 0,2oz
Pounds 33.06 lb
33,06lb 0.02 lb 0,02lb
Pounds & Ounces 19 lb 15 oz* 19_15lb-oz 1 oz 0_1lb-oz
SCALE RANGE = 30 kilograms
SELECTED
UNITS FULL SCALE DISPLAY RESOLUTIO
N DISPLAY
Grams 19999 g*
19999g 10 g 10g
Kilograms 30.00 kg
30,00kg 0.01 kg 0,01kg
Ounces 1058.0 oz
1058,0oz 0.5 oz 0,5oz
Pounds 66.15 lb
66,15lb 0.05 lb 0,05lb
Pounds & Ounces 19 lb 15 oz* 19_15lb-oz 1 oz 0_1lb-oz
*NOTE: Ranges marked with an asterisk are limited by the range of displayable numbers, not by the
maximum capacity of the scale, and will show an “
E Or ” message when the result is over range, rather
than an “
EOL ”message when the scale is overloaded.

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TROUBLE SHOOTING GUIDE
SYMPTOM POSSIBLE CAUSE SUGGESTIONS
Blank display when the [On]
key is pressed without the
charger being connected.
Battery discharged.
Battery disconnected.
Plug in mains power supply
/charger.
Check battery connections.
Blank display when [On] is
pressed with charger
connected.
Internal power cable is
disconnected.
Keypad cable is
disconnected.
Reconnect cable from power
supply board to the main
board.
Reconnect cable from
keypad to the main board.
Display shows “ EHi ” at
power up. Load present on weight
pan. Switch off instrument. Remove load from weight
pan. Switch on again.
Display shows “ ELo ” at
power up. Weighing pan not fitted.
Load cell disconnected. Switch off instrument. Fit
plastic and metal weight
pan. Switch on again.
Check connections between
load cell and the main board.
Weighing readings are
incorrect. Scale requires re- calibration. Recalibrate using external reference mass.
Weighing readings are
unstable. Draught or vibration. Ensure scale is placed on a firm, vibration-free surface
away from sources of
draught.
Display shows “ EOL ” during
weighing. Weighing pan is
overloaded. Remove weight from pan.
Display shows “ EOr ” during
weighing. Weight value is too large
to be displayed in
currently-selected units.
Remove weight from pan or
select alternative units.
Charge LED does not
illuminate when charger
plugged in.
No mains supply to the
charger. Check the wall socket.
Charge LED shows green
but scale does not function
without charger connected.
Battery faulty or
disconnected.
Internal fuse on power
supply board blown.
Check battery connections.
If connections OK, replace
battery.
Replace fuse with one of the
same rating.
Charge LED remains red
after several hours of
charging.
Battery faulty. Replace battery.

DISPLAY AND KEYS
POWER
The scale is turned on by pressing the [On] key. There should be no load on the scale
when power is applied.
When the scale first powers up, the display will show the software revision number in the
form “
rX.XX ”. After about 2 seconds the display will then show the rated scale capacity.
This will be in the form “
CXXkg ”, where XX is the capacity in kilograms if the last selected
units were Grams or Kilograms, or “
C XX lb ”, where XX is the capacity in pounds if the last
selected units were Pounds, Ounces or Pounds & Ounces. After a further 2 seconds all
the display segments will turn on for approximately 2 seconds. The scale is then zeroed
and displays a zero reading, accompanied by the last selected units.
If the reading from the scale indicates that a load is in place on the scale at power-up, an
error message “
E Hi ”will flash on the display for about 5 seconds. If the reading from the
scale indicates that the weighing pan is not in place on the scale at power-up, an error
message “
E Lo ”will flash on the display for about 5 seconds. The scale will then operate,
but will not have established a new no-load value. In order to achieve this, the scale
should be powered down, the load removed or the weighing pan fitted, and the scale
powered up again.
The scale is turned off by pressing the [Off] key or by the timed automatic power-off
function (if enabled). A voltage detector is also included, which is used to indicate a low
battery condition by displaying the battery symbol. If the scale is not then attached to a
charger or manually switched off, the electronics will subsequently shut down the scale,
even if the automatic power-off is disabled.
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ZERO / TARE
A zero or tare operation may be performed at any time by pressing and then releasing the
[Zero/Tare] key. The display will show “- - - -” until the key is released, followed by the
message “
tArE ”during tare value measurement, then the displayed weight value will be
set to zero.
If the tare reading is within a small range of the initial no-load value established at switch
on, the zero indicator will be displayed and the scale will still have the maximum capacity
available for weighing before an overload condition is displayed.
If however the tare reading is greater than this small range, indicating that a weight is
present, the scale will tare. The weight value will still be displayed as zero, but will show
the tare indicator instead of the zero indicator and the additional capacity before an
overload condition is displayed will be reduced by the amount of weight on the scale when
it was last tared.
If the scale is unable to obtain a stable weight value during the taring process after a
number of retries, it will display an error message “
E St ”, then abort the tare attempt and
return to weighing.
Whenever the scale is subsequently displaying a zero value, either the zero or the tare
indicator will be displayed.
Tare
Stable
Zero
Low Bat
Whenever a weight is put on to the scale the zero, tare and stable symbols will all turn off,
then when the reading has stabilised, the stable symbol will turn on. The units symbol will
be on at all times during normal weighing.
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WEIGHING UNITS SELECTION
The desired weighing units may be selected by pressing the [Units] key (display shows “--
- -”) and then releasing it. The display will select each of the available units of weight in
turn, indicating the currently-selected units and the current weight value in the new units.
The units available for selection are set in the user set-up function as described below.
NOTE: If there is sufficient weight on the scale to cause the display to go out of range
when an alternative unit is selected, an “
E Or ” error message will be displayed. If this
occurs, the load should be removed, or the [Units] key should be pressed and then
released to select the next alternative unit.
CALIBRATION
It is only possible to perform a calibration of the scale using a single value of standard
mass which is equal, or near to, the maximum capacity of the scale. If metric units (i.e.
Grams or Kilograms) are selected, the value of the calibration mass required is the
maximum capacity of the scale in Kilograms. If imperial units (i.e. Pounds, Ounces or
Pounds & Ounces) are selected, the value of the calibration mass required is in Pounds as
shown in the following table:
Maximum Scale Capacity
(kg) Calibration Mass (lb)
1.5 3
3 5
6 10
15 30
30 60
The software includes checks to prevent the calibration from being performed if there is no
weight or a grossly incorrect weight on the scale, or it is overloaded.
Procedure:
•Press and hold the [Cal] key. The display shows “-- - -”. After 3 seconds the display
will change to “
C 0 ”. Release the key. If the [Cal] key is released within 3 seconds,
the calibration request will be ignored and the scale will return to normal weighing.
•Ensure that there is no weight on the balance, and then press the [Cal] key again.
The display will show “
tArE ”. Release the key.
•If the no-load calibration value is acceptable, the display will then show “ C XX uu ”
where
XX is the value of calibration mass required, and uu is the units (lb or kg) for
the calibration mass, e.g. “
C 6 kg ”for a 6 kilogram mass, or “ C 10 lb ” for a 10
pound mass.

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•Place the correct calibration mass on the scale.
•Press the [Cal] key again. The display will show “
CAL ”. Release the key. The
display will continue to show “
CAL ” until calibration is complete and then return to
normal weighing, when it should display the correct calibration weight value in the
currently-selected units.
NOTE: If the no-load or full-load reading is too low, an “
ELo ”error will be displayed.
If the no-load or full-load reading is too high, an “ EHi ”error will be displayed.
If the no-load or full-load reading is unstable, an “ ESt ”error will be displayed.
If any of these conditions occur, or if [Cal] is not pressed within 10 seconds of the
“
C 0 ”message being displayed, the calibration procedure will be aborted and the
scale will return to normal weighing using the previous tare and calibration values.
USER SETUP PARAMETERS
FUNCTION OF THE KEYS
To enter the user-parameter setup menu, the [Zero/Tare] key should be held pressed, and
while the display is showing “----” the [Units] key should be pressed. The first setup option
will then be shown.
Release both the keys. If [Zero/Tare] is released without the [Units] key being pressed,
the display will change to “
tArE ”, a normal tare operation will be performed, and the setup
menu will not be entered.
When in the setup menu, the functions of the keys are as follows:
Press [Zero/Tare] to select alternatives within any parameter.
Press the [Cal] key (display shows “-- --”) then release the key to save any changes to the
current parameter, exit the setup menu, and return to normal weighing mode.
Press the [Units] key to save any changes to the current parameter and move to the next
setup parameter.