Intelligent Weighing Technology QHD+3 User manual

QHD series
Counting Scale
SERVICE MANUAL
©Intelligent Weighing Technology, Inc. 2012. All rights reserved worldwide.
The information contained herein is the property of Intelligent Weighing Technology. and
is supplied without liability for errors or omissions. No part may be reproduced or used
except as authorized by contract or other written permission. The copyright and the
foregoing restriction on reproduction and use extend to all media in which the
information may be embodied.

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CONTENTS
1. PRECAUTIONS……………………………………………………………………..4
2. INSTALLATION……...…………..…………………….…………………………..…5
3. NAME AND FUNCTIONS…………….…………………………………………7
Key board………………………………...................................................7
Display………………………………………………………………………8
4. OPERATION………………………………………………………….…………9
Power On/Off…………………….…………………………………………9
Switch to local / Remote Scale….…....………………………………….9
Zero……………………………….…………………………………………9
Tare………………………………………………………………………….9
Accumulation………………………………….………………………….10
Manual Accumulation……………………………………………………..10
Saved Data…………………………………………………………………10
Delete Data…………………………………………………………………10
Automatic Accumulation…………………………………………………..11
Parts Counting………………………………………………………..…..11
Weighing a sample to determine the Unit Weight…………………….. 11
Enter a known Weight……………………………………………………..12
Automatic update of Unit Weight…………………………………………12
Check weighing of count pre-set…………………………………………12
Setting the checking limits………………………………………………..12
PLU (Product Look Up)………………………………………………….13
Storing PLU………………………………………………………………...13
Entering Description manually……………………………………………14
Recalling PLU……………………………………………………………...15
5. PARAMETERS…………………………………………………………………16
Keys into the parameter…………………………………………………..16
Parameter settings………………………………………………………...17
6. RS-232 OUT PUT………………………………………………………………18
7. CALIBRATION…………………………………………………………………21
8. TECHNICAL PAAMETER…………………………………………………….22
9. ERROR DISPLAY……………………………………………………………...24
10. TROUBLE SHOOTING…………………………………………………………25

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11. MAINTENANCE…………………………………………………………………27
Change Parts………………………………………………………………..27
Replace main board…………………………………………………………27
Replace display board……………………………………………………....28
Replace load cell…………………………………………………………….28
Replace battery………………………………………………………………28
Checking Components……………………………………………………29
Checking Load cell…………………………………………………………..29
Load cell connections……………………………………………………….29
Checking voltages…………………………………………………………30
12. CIRCUIT DIAGRAM……………………………………………………………..31
13. DRAWING………………………………………………………………………...33
Parts List……………………………………………………………………….34
14. SPECIFICATIONS………………………………………………………………..35
Specifications………………………………………………………………….35
Specification for Remote scale ……………………………………………..36
Specification for Local scale Load Cell……………………………………..36

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1. PRECAUTIONS
Read this manual before operating or servicing this
equipment.
Follow these instructions carefully.
Disconnect this equipment from the power source before
cleaning of performing maintenance.
Keep the manual for your future reference.
Avoid extremes of temperature. Do not place in direct
sunlight or near air conditioning vents.
Avoid unsuitable tables. The tables or floor must be rigid
and not vibrate. Do not place near vibrating machinery.
Avoid unstable power sources. Do not use near large
users of electricity such as welding equipment or large
motors.
Avoid high humidity that might cause condensation. Avoid
direct contact with water. Do not spray or immerse the
scales in water.
Avoid air movement such as from fans or opening doors.
Do not place near open windows.
Do not stack material on the scales when they are not in use.
Keep the scales clean.

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2. INSTALLATION
Unpacking
Carefully take the balance out of its package, make it sure its not damaged and all
accessories are included.
Accessories,
1. Balance
2. Adaptor
3. Stainless steel pan
4. Product manual
Keep the packaging material for your future use.
SETTINGS
Local Scale:
Place the scale on a table.
Place the platform in the locating holes on the top cover.
Do not press with excessive force as this could damage the load cell inside.
Check the water mark. If, bubble is not centre adjust the leveling feet until reach
centre. Check the level when you change the location.
Attach the power supply cable to the connector on the right side of the scale
base. Plug in the power supply module.
Turn on the Scale. The power switch is located at the right side of the scale base.

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The scale will be shown the model number in the “Weight” display and will be
start self test.
Remote Scale:
The QHD+ Series can be connected to any size of load cell type weighing base
through the Remote scale port on the left 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 center.
Press key to change remote mode and check weighing performance.
Remote Scale Connection
The cable of the load cell goes to a 9 pin DB9 d-subminiature plug connecter with
following connections.
Pin Connection
1 and 2 Excitation+(5V)
4and 5 Excitation- (0v)
7 Signal-
8 Signal+
Note: The sense wires connections of a six wire load cell are not used but can be
connected to the respective Excitation pins.
Remote Scale Setup
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, for example: 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 utilized 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, for example, set to 1:5000 or 1000kg x 0.2kg.

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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 0.1uV/d.
3. NAME AND FUNCTIONS
Key Board
Keys Press this key to
to
Numeric Keys. Enter to individual unit weights and the
present tare
Clear incorrect entries and error conditions
Decimal Point. Numeric input numbers select to the left.
Returns the display to zero.
Enter the clear tare weights, Storing the current weight as
tare value. Subtracting the tare value from the total weight
and displays the result as net weight.
Manually enter the weight of sample, also changes the unit
if they are enabled.
Enter the numbers of items, used for the unit weight.
Add the current count data aggregated. Also evokes the
memory if pressed to balance empty. Can add up to 99
values, or until it reaches the maximum displayable digits
Enter to store and recall the PLU
To set the upper limit of the number of items counted and
back light setting.
To select the local or remote scale.

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Display
The arrow “▼” above the symbols
Weight Display
Low Battery
Net Net Weight Display
Stable Stable Display
Zero Zeroing Display
Lb / kg Current Weighing Mode
Unit Weight Display
Smpl No of samples is very low
U.Wt Unit weight is below the minimum weight
M+ Data entered into the memory
Local / Remote Active Scale in use
Count Display
CkPcs Active in Counting Mode
Wt Active in Weighing Mode
High Check Result above the high limit
OK Check Result with in the limit
Low Check Result below the low limit
Charge Status of the battery charging

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4. OPERATION
Initial Start-up
Warm-up time of 15 minutes stabilizes the measured values after switching on.
1. Power ON/OFF
Power switch is located below the right side of the scale. Switch on the scale by
pressing on/off. The display is switched on and the self test is started.
If you want to switch off press backward the key.
2. Switch to Local / Remote Scale
By pressing the display changes from one to other scale.
In Local Scale
In Remote Scale
The basic weighing functions are same for both the scales- local and remote.
The number of weighing divisions may be less on the remote scale dependant
on the total capacity of the load cell/s used.
3. Zero
Environmental conditions can lead to the balance exactly zero in spite
of the pan not taking any strain. However, you can set the display of
your balance to zero any time by pressing key and therefore
ensure that the weighing starts at zero.
4. Tare
The weight of any container can be tared by pressing button so that with
subsequent weighing the net weight of the object being weighed is always
displayed.
Load weight on the pan.
Press key. Zero is displayed, and tare is subtracted.
Remove weight from the platform. Tared weight is displayed. It can
set only one tare value. It can display with a minus value.
Press key. Zero is displayed, tare weight is cleared.
Enter a tare value using by numeric keys.
This method allows you to enter a value for the tare weight from the
keypad. This is useful if all containers are the same or if the container is
already full but the net weight is required and the weight of the container is
change
Local
change
remote

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known.
Ensure display is in zero.
Enter the known tare weight by using numeric keys.
Press to enter, weight will be stored as tare weight and displayed with
minus sign and net indicator.
Place the container on the platform, net weight will be displayed.
The tare will be rounded up according to the readability of the
balance. For example, if a tare value of 103g is entered into the
60Kg scale with 5g readability, then the display will be shown -105g.
5. Accumulation
The balance can totalize weight values or count quantities.
Manual Accumulation
The values (weight and count) shown on display can be add to the memory
by pressing key. Set the parameter F1 off –print –au off
Place the goods to be weighed.
Wait few seconds for display stability then press .
The weight display will be show the total weight, the unit weight display will
be show the number of items and count display will be show the total
accumulated count. The values will be displayed 2 seconds.
The scale must return to come zero or negative number before adding
another samples.
More products can be added by pressing . It can add up to 99 entries
or until the capacity of the weight display is exceeded.
Display of Saved Data
To check the total value saved, press key when the display is in
zero. Total weight will be displayed two seconds.
Delete Saved Data
To clear the memory, press the display will be shown saved data.
0
0
0 .5 00
15
1
0 .5 00
0
-
3
-
1 .5 00

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Press during the display, delete all saved accumulation data.
Automatic Accumulation
Weighing values automatically accumulate total, when the goods is
unloaded and with out key pressing.
Set the parameter F1 off –print –au on
Place the goods on the platform
Wait few seconds for display stability and a control beep.
Unload the goods from the platform, the weighing value is added into the
memory
The scale must return to come zero or negative number before adding
another samples.
It can add up to 99 entries or until the capacity of the weight display is
exceeded.
6. Parts Counting
In order to do parts counting, it is necessary to know the average weight of the items
to be counted. This can be done either by weighing a known number of the items
and letting the scale determine the average unit weight or by manually inputting a
known unit weight using the keypad.
To count a greater number of parts the average weight per part has to be determined
with a small quantity.
The average piece weight can be increased at any time during the counting process,
by entering the displayed number of items and confirming by pressing .
Weighing a sample to determine the Unit Weight
Reset the balance to zero or tare the empty container if necessary.
Place the known quantity of items on the scale, wait few seconds for display
stable.
Enter the number of quantity by using numeric keys. Eg: 15
0
1 .5 00
-
1
-
0
1 .5 00
0
1 .5 00
0
0
0
0
-
0
-
0 00
0
1 .5 00
15

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Enter the key to confirm. The scale determines the average parts weight.
As more items are added to the scale, the weight and the count will increase.
If the scale is not stable, the calculation will not be completed.
If the weight is below zero, “Count” display will show negative count.
Enter a known Unit Weight
If already know the unit weight, and then it can enter by using numeric keys.
Enter the value of unit weight by numeric keys.
Press during the unit display flashing.
If in the weight display as “kg” unit is active, the average piece weight will be
displayed in “g”. If as “lb” is active, the average piece weight will be displayed
in “lb”.
Automatic Update of Unit Weight
The scale can automatically update the unit weight, when a sample less than
the initial sample count are added.
A beep will be heard when the value has updated.
By pressing key, can be blocked unit weight and auto update
Check Weighing or Count Pre-set
Check weighing is a procedure to cause an alarm to sound when the weight or piece
quantity within the checking limits. Limits can beset by using numeric keys.
Setting the Checking Limits
Press key, the active mode will be shown
Press key to select counting
Press key, the active high count limit will be shown
10
1 .5 00
0 .15
Pst
net
Pst
cnt
Hi cmt
1 500

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Use numeric key to enter desired and if necessary press to clear.
Press key, the active low count limit will be shown
Use numeric key to enter desired and if necessary press to clear.
Press key to return weighing mode.
For check limits, just one limit value can set
If both values are deleted, the check mode is deactivated.
The beep sound will be worked as described in the beep parameter
f1 off ,beep
PLU (Product Look Up)
PLU are used to store items. It can store up to 99 PLU numbers.
These data should be entered against a particular PLU before the weighing process
starts, so that the desired PLU’s can be recalled duringthe weighing process. The
data can be stored and recalled manually or by sending data over RS-232 Interface
Storing PLU
Press key to ensure display zero.
Tare and unit weight to be stored can be either taken from a weighing in process or
by enter manually.
Press display will be shown
Press numeric key 2 and 7
Press
Currently stored text will appear
The first digit is flashing, it can
Change by using numeric keys
If necessary, delete additional text
lo cmt
500
P lu
-
-
P lu
27
P lu 27
Apple
P lu 27
-

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By pressing
Continue to enter text until description is
complete (max: 12 characters)
Use key, number selection to left.
Use key, number selection to right.
Press and hold two seconds key, space to right.
Tare values can be saved when in the admitted taring range(default >2% of
capacity)
Entering Description Manually
To set the description, press the numeric button and keep it pressed until the desired
letter is displayed. The characters are according to key board.
1 - / \
2 A B C
3 D E F
4 G H I
5 J K L
6 M N O
7 P Q R S
8 T U V
9 W X Y Z
0 _ [ ] _ (space)
The characters and the displayed symbols are
A B C D E F G H I J K L
M
N O P Q R S T U V
W
X Y Z - / \ ( )
ABCDEFGHIJKLMNOPQRSTUVWXYZ
1234567890
1234567890
Note that this method is only used where alpha-numeric data is permitted. This is used
for the Description field and the User ID number, Scale ID number in the parameters
section.
P lu 27
abcdefg
hijklmn

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Recalling PLU
To recall the PLU values the user should first select either local or remote scale the tare
value stored will be specific to the scale selected.
Press display will be shown
Press numeric key 2 and 7
Press
PLU’s can be stored and recalled using RS-232 Interface.
P lu
-
-
P lu
27
P lu 27
Abcdefg
hijkllm

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5. PARAMETERS
Enter into the Parameter
Turn on the scale, press during that start up.
Display will be shown
Select the Menu Block
Press key, it can choose menu block one by one.
Enter the Selected Menu
Press key, it can confirm which will be shown displayed.
Select the Sub- Menu
Press key, it can choose the sub-menu block one by one.
Return to Weighing Mode
Press key, it can escape from the menu and exit to weighing mode.
F1 off

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Parameter Setting
Menu Sub Menu Description
Beep off Beeper is turned off
Beep On in Beeper is turned on, will be
sounded with in the check
weighing limits
Beep
Beep On out Beeper will be sounded above the
check weighing limits
Lite aut Backlight will be turn on
automatically, when loaded or key
is pressed
Lite off Backlight is turned off
El
Lite on Back light is turned on
Kg /lb Weighing Unit kg and lb are enable
Kilo Weighing Unit kg only
unit
lb Weighing Unit lb only
0Auto off function disable
3Scale will be off three minutes later
5Scale will be off five minutes later
15 Scale will be off 15 minutes later
Fi off
Off
3 0 Scale will be off 30 minutes later
Au on Data out put / accumulation after
unloading the balance
Print
Au off Data out put / accumulation after
by pressing
P cont RS 232 data output continuously
P mode
Ser re RS 232 data output weight only
B 600
B 1200
B 2400
B 4800
P baud
B 9600
Set the required baud
8n1 8 bits, no parity
7e1 7 bits, even parity
parity
7o1 7 bits, no parity
Tpup Standard printer setting
F2 prt
P type Lp50 Tscale Label Printer
U id U id abcdef Shows the current User ID (max 6
characters)
Sc id Sc id abcdef Shows the current Scale ID (max 6
characters)
Tech Technical parameter password
protected

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6. RS- 232 OUT PUT
The QHD Series of scales can be ordered with an option RS-232 output.
Specifications:
RS-232 output of weighing data
ASCII code
4800 Baud
8 data bits
No Parity
Connector: 9 pin socket
Pin 2 Output
Pin 3 Input
Pin 5 Signal Ground
Sample of out put
Control Commands
LOCAL SCALE
ID: 123ABC
NAME:Text
12.456 kg NET
1.1234 g U.W.
11 PCS
TOTAL
------------
49.824 kg TW
44 TPC
4 No.

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The scale can becontrolled with following commands.
Basic Commands:
PLUxx Select PLU from scale memory
T Tare current weight value
T123.456 Numeric tare value
Z Zero
P Print
M+ Store and print current results
MR Recall memory values to scale display
MC Clear memory
U123.456 Store unit weight of 123.456 kg / lb
S123 Enter sample size of parts 123 . Same as pressing
SL Select local scale to be used
SR Select remote scale to be used
Printing Commands:
\L Scale: Local or Remote
\I User ID number
\S Scale ID number
\N Net weight
\G Gross Weight
\T Tare weight
\U Unit weight
\P Count
\C Total Count
\W Total Weight
\M Number of items stored in memory
\B A blank / space line
PLU entry using RS 232 interface
This will allow the scale data to be sent from a PC program as well as from the keypad.
The most common PLUs can be stored and recalled from the scale memory. Other PLU
data can be stored on a PC, then the text data, unit weight and tare data can be sent
from the PC to PLU00. This can then be used and over written each operation.
OPERATION:
Send tare data to set any tare value to be stored with PLU. i.e. “T0.150” <CR>. If
no tare is needed then you may send T0 to delete any present tare data.
Send the unit weight to be stored with PLU. ie. “U12.3456” <CR>

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Send PLU text data to be stored with current TARE and U/W values. ie.
“SPLU01,Parts” <CR>