Adam Equipment CQT 202 Assembly instructions

@Adam Equipment Company 2011
Adam Equipment
CQT Service
ADAM EQUIPMENT CO. LTD.,
revA, January 2011

@Adam Equipment Company 2011

©Adam Equipment Company 2011
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CONTENTS
1CQT FEATURES ............................................................................................ 3
2CQT SPECIFICATIONS................................................................................... 3
3INTRODUCTION .......................................................................................... 4
4REMOVING THE COVER ............................................................................... 5
5LOAD CELL DAMAGE.................................................................................... 5
5.1 5.1 A/D COUNTS ................................................................................ 5
6PRINCIPLE OF OPERATION ........................................................................... 7
7DEALER PARAMETERS .......................................................................... 8
7.1 FILTER.............................................................................................. 8
7.2 ZERO TRACKING RANGE............................................................... 8
7.3 LINEARITY CALIBRATION POINT................................................... 8
7.4 LINEARITY CALIBRATION AMEND VALUE .................................... 9
7.5 CAPACITY ........................................................................................ 9
7.6 DIVISION .......................................................................................... 9
7.7 CALIBRATION WEIGHT................................................................... 9
7.8 CALIBRATION ................................................................................ 10
8ERROR MESSAGES ..................................................................................... 10
9TROUBLE SHOOTING GUIDE ............................................................... 12

©Adam Equipment Company 2011
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©Adam Equipment Company 2011
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1 CQT FEATURES
•Auto hut off
•Auto zero tracking
•Auto backlight (optional)
•Low battery indication
•Kg/g/lb/oz/ct/dr/GN/N/tl.t conver ion
•Large LCD (6 digit 18 mm high)
•Large quare SS pan
•Net weight/ tability indication
•Auto calibration
2CQT SPECIFICATIONS
Model # CQT-202 CQT- 251 CQT-601 CQT-1501 CQT-2601 CQT-2000 CQT-5000
Maximum
Capacity 200g 250g 600g 1500g 2600g 2000g 5000g
Readability 0.01g 0.1g 0.1g 0.1g 0.1g 1g 1g
Re olution 1:20000 1:2500 1:6000 1:15000 1:26000 1:2000 1:5000
Repeatability
(Std Dev) 0.02g 0.1g 0.1g 0.2g 0.2g 1g 1g
Linearity ± 0.02g 0.1g 0.1g 0.2g 0.2g 1g 1g
Unit of
Mea ure kg / g / lb / oz / ct / dr / GN / N/tl.t
Stabili ation
Time 3 econd 2 econd 3 econd 2 econd
Operating
Temperature
0ºC to 40ºC
32ºF to 104ºF
Power Supply 12VAC @ 150mA adapter or 6x AA batterie
Calibration Pu h button calibration u ing external ma
Calibration
Ma
100g/
200g
100g/
200g
200g/
400g
/600g
500g/
1000g/
1500g
1000g/
2000g
1000g/
2000g
1000g/300
0g/5000g
Di play 6 digit LCD, 18mm digit , with backlight
Draft hield
(diameter x h)
132mm ø x 82mm
(5.2” ø x 3.2”) N/A
Balance
Hou ing ABS Pla tic
Pan Size 120mm ø (5.1” ø) 145mm ø (5.7” ø)
Overall
Dimen ion
(w x d x h)
173 x 255 x 86mm (6.8” x 10” x 3.3”)
Without draft hield
Net Weight 820g (1.8lb)

©Adam Equipment Company 2011
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3INTRODUCTION
The cale are all ba ed on re i tance train gauge load cell . The load
cell output a mall voltage in re pon e to a load placed on the weighing
platform. The voltage i in the range of approximately 10mv for a full
capacity load.
The ignal from the load cell i pre ented directly to an A/D converter for
conver ion to a digital value for u e by the microproce or.
It may be nece ary to replace a load cell if it i damaged.
The load cell connection are:
Before any change are made to the cale, it will be nece ary to
trouble- hoot the problem and determine the be t method to olve the
problem . Refer to the Trouble- hooting Guide for ugge tion .
High Re olution cale
CQT 202,1501 & 2601
Signal - Black
Signal + Green
Shield Yellow
Ext - White
Ext + Red
Low Re olution cale
All other
Signal - White
Signal + Green
Ext - Black
Ext + Red

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4 REMOVING THE COVER
If it become required to remove the cover, you hould be very careful
a pulling or pre ing on the load cell during thi procedure can damage
it very ea ily.
When removing the crew (4 mall crew below the cale) hold the
cover to the ba e and en ure not to pre on the balance ca e a the
load cell can be damaged. The load cell i attached to the ba e.
The load cell are protected by overload and under-load top . The e
top are either plate that contact the cover or crew that are
acce ible from the out ide of the cale .
Refer to the Trouble- hooting Guide for the po ible cau e of any
problem.
5LOAD CELL DAMAGE
5.1 5.1 A/D COUNTS
Pre [Unit] fir t and then pre [On/Off], while keeping the [Unit] key
pre ed to enter the dealer parameter . The di play will how the
ver ion number and then reque t pa word .
Pre [Unit],[Unit], [T re], [Unit], [Unit] in equence to enter the etting
mode.
Pre the [Unit] key everal time until you enter the calibration etting .
Then you can ee the A/D count.
To ee the every divi ion A/D count ,for example: the CQT202 with the
readability 0.01g.
Fir t record the current A/D count, e.g 43860, then put on the 1g weight
to ee the new A/D Count ,eg:44198. So the divi ion A/D count i
(44198-43860)/100=3.38. The count hould bigger than 3.

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If the divi ion A/D count are out ide thi range or cannot be een then
it will be nece ary to trouble hoot the load cell, load cell connection
to verify the load cell i working correctly and ha not been damaged.
The mo t common rea on for a cale to fail i that the load cell ha been
damaged. The damage can be due to two primary cau e . The fir t i
the phy ical damage due to an overload or an impact from the ide and
the econd i damage due to the environment, uch a moi ture,
extreme heat or a cut cable if the cable are expo ed.
With the CQT cale it i po ible the load cell i damaged uch that the
cale till operate when the cale i calibrated but not when a mall
ma i put on the pan. Thi will become apparent when the cale read
correctly at the calibration ma but i not correct at lower ma e . The
cale may till zero OK after power i applied but it will not regi ter a
weight value for maller weight .
Check the A/D count in thi ca e.

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6PRINCIPLE OF OPERATION
The train gauge load cell i a method of mea uring the amount of tre
put onto a metal tructure due to a weight being upported by the
tructure. The tre i mea ured u ing 4 train gauge en or mounted
in a particular way on the metal tructure.
The e 4 train gauge are connected in uch a way that they form a
Wheat tone bridge. See the figure below. In the imple t load cell
there are only the 4 re i tance of the train gauge to con ider.
Normally without a load on the load cell, all the re i tance are the
ame. However, when the load cell ha a weight on it, two of the train
gauge will be in compre ion (A and D) and the re i tance will decrea e
and the other two will be in ten ion (B and C) and their re i tance will
increa e.
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
Thi will cau e the bridge to become unbalanced. When the bridge ha a
voltage acro it from +E to -E then the ignal output at +S and -S will
how a voltage of zero volt with no load and a mall voltage
proportional to the load a the load i increa ed. Typical load cell how
10mv of ignal if the excitation voltage i 5volt and the load cell i fully
loaded.
To check the load cell, apply power to the cale and mea ure a voltage
between the S+ and S- wire when de- oldered from the PCB. The
voltage hould be le than 2millivolt with no load on the cale,
increa ing a the load i applied. The voltage between the E+ and E-
wire hould be 5V.

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7 DEALER PARAMETERS
•Pre [Unit] fir t and then pre [On/Off], while keeping the
[Unit] key pre ed to enter the dealer parameter . The
di play will how “Cqt-1.0 Cqt” “080410 Cqt” and then
reque t pa word .
•Pre [Unit], [Unit], [T re], [Unit], [Unit] in equence to
enter the etting mode.
7.1 FILTER
•The di play how “Cqt-1.0 Cqt”and“080410 Cqt”, 1 econd
later the balance will enter filter etting and the LCD will
how “X FIL”. “X” i the value for the amount of filtering to
be done. Set a value of 1 to 6. A larger number i more
filtering and a lower re pon e. Default i “1”.
•Pre [T re] key to croll through the option .
•Pre [Unit] to confirm and enter zero tracking range
etting.
7.2 ZERO TRACKING RANGE
•When enter zero tracking range etting, the di play will
how “X ZEO”. X i the value for the amount of auto-zero
range. Set a value of 1 to 7. A larger number i a larger
range. Default i “1”.
•Pre [T re] key to croll through the option .
•Pre [Unit] to confirm and enter linearity calibration point
etting.
7.3 LINEARITY CALIBRATION POINT
•Thi function mean etting a point to u e in linearity
calibration.
•When enter linearity calibration point etting, the di play
will how “X LID”. “X” i the value for point number. Set a
value of 0 to 5. “0” mean the point i at 1/3 of capacity, “1”
i 1/2, “2” i 2/3, “3” i 5/6, “4” i 6/7, “5” i 1. Default i
“0”.
•Pre [T re] key to croll through the option .