LG Electronics Scale QHW 15 User Manual

QHW series  
Digital Weighing Scales  
User’s guide  
UGQHW-E0204  
 
Contents  
SECTION 1 INTRODUCTION………………………………………………………………1  
SECTION 2 SPECIFICATIONS……………………………………………………..……2  
SECTION 3 INSTALLATION……………………………………………………..……….3  
3.1 General Installation……………………………………………………………………3  
3.2 Install of QHW series…………………………………………………………..………3  
SECTION 4 KEY DESCRIPTIONS………………………………………………………4  
SECTION 5 DISPLAYS………………………………………………………………….5  
SECTION 6 OPERATION…………………………………………………………….…..6  
6.1 Zeroing the display…………………………………………………………………….6  
6.2 Taring……………………………………………………………………………..…….6  
6.3 Weighing a sample……………………………………………………………..…….6  
6.4 Percent weighing………………………………………………………………..…….6  
6.5 Parts counting……………………………………………………………………..…….7  
6.6 Check-weighing………..………………………………………………………..…….7  
6.7 Accumulated total………..………………………………………………………..…….8  
6.8 Manual accumulation………..…………………………………………………..…….8  
6.9 Automatic accumulation……..………………………………………………..…….9  
SECTION 7 BATTERY OPERATION………………………………………………..…10  
SECTION 8 RS-232 OUTPUT…………………………………………………………..11  
SECTION 9 PARAMETERS……………………………………………………………12  
SECTION 10 CALIBRATION……………………………………………………..……..13  
SECTION 11 ERROR CODES…………………………………………………………15  
 
 
SECTION 1 INTRODUCTION  
The QHW series of scales provides an accurate, fast and versatile series of general  
purpose weighing scales with counting, % weighing and check-weighing functions.  
There are 4 models in each series, with capacities up to 30 kg.  
They all have stainless steel weighing platforms on an ABS base assembly.  
All the keypads are sealed, color coded membrane switches and the displays are  
large easy to read liquid crystal type displays (LCD). The LCD’s are supplied with a  
backlight.  
All units include automatic zero tracking, audible alarm for pre-set weights, automatic  
tare, pre-set tare and an accumulation facility that allows the count to be stored and  
recalled as an accumulated total.  
- 1 -  
 
QHW digital weighing scales user’s guide  
SECTION 2 SPECIFICATIONS  
QHW SERIES  
QHW 15  
15kg  
0.5  
1:30000  
-10kg  
10g  
QHW 30  
30kg  
1g  
1:30000  
-30kg  
20g  
Model #  
Maximum Capacity  
Readability  
Resolution  
Tare Range  
Minimum Capacity  
Repeatability (Std Dev)  
Linearity ±  
QHW 3  
3kg  
QHW 6  
6kg  
0.1g  
1:30000  
-3kg  
2g  
0.2  
1:30000  
-6kg  
4g  
0.1  
0.2  
0.5g  
1g  
1g  
2g  
0.2g  
0.4  
Units of Measure  
kg, g, Lb., oz.  
Common Specifications  
Interface  
RS-232 Output Optional  
2 Seconds typical  
0°C - 40°C / 32°F - 104°F  
115 / 230 Vac, 50/60Hz, 10 watts  
Automatic External  
Stabilisation Time  
Operating Temperature  
Power supply (external)  
Calibration  
Display  
Draft shield  
6 digits LCD digital display  
N/A  
Balance Housing  
Pan Size  
Overall Dimensions (wxdxh)  
Gross Weight  
ABS Plastic, Stainless Steel platform  
225 x 300mm / 8.9 x 11.8”  
320 x 340 x 125mm / 12.6 x 13.4 x 4.9”  
3.8kg/8.4lb  
Applications  
General Purpose Scale  
Functions  
Other Features and Specs  
Weighing, parts counting, % weight, Check weighing,  
Internal rechargeable battery (~70 hours operation)  
- 2 -  
 
SECTION 3 INSTALLATION  
3.1 GENERAL INSTALLATION  
The scales should be sited in a location that will not degrade the accuracy.  
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.  
Keep the scales clean.  
Do not stack material on the scales when they are not in use.  
3.2 INSTALLATION of QHW SERIES  
The QHW Series comes with a stainless steel platform packed separately. 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.  
Level the scale by adjusting the four feet. The scale should be adjusted such that the  
bubble in the spirit level is in the centre of the level and the scale is supported by all  
four feet, If the scale rocks readjust the feet.  
Attach the mains cable to the connector on the bottom of the scale. The power switch  
is located on the base near the front of the scale.  
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QHW digital weighing scales user’s guide  
SECTION 4 KEY DESCRIPTIONS  
Zero or  
Set the zero point for all subsequent weighing. The display shows zero.  
A secondary function  
functions.  
, of "Enter" key when setting parameters or other  
Tare or  
Tares the scale. Stores the current weight in memory as a tare value, subtracts the  
tare value from the weight and shows the results. This is the net weight. Entering a  
value using the keypad will store that value as the tare value.  
A secondary function  
, of incrementing the active digit when setting a value for  
parameters or other functions.  
Lim or  
Sets the limits for check weighing. Allows setting of either the low limit or the high  
limit or both.  
Secondary function  
, is to move the active digit to the right when setting values  
for parameters or other functions.  
%
Enters the percent weighing function. Allows the weight, unit weight, and count to  
be seen when parts counting.  
Secondary function  
, is to move the active digit to the left when setting values for  
parameters or other functions.  
Func or  
Used to select the function of the scale. If the scale is weighing it will select parts  
counting. Of it is not in weighing mode it will return the user to weighing.  
Secondary function ( C ) , is to act as a clear key when setting values for parameters  
or other functions.  
Print or  
To print the results to a PC or printer using the optional RS-232 interface. It also  
adds the value to the accumulation memory if the accumulation function is not  
automatic.  
Secondary function (ESC) , is to return to normal operation when the scale is in a  
parameter setting mode.  
U key  
This key will select either kilogramspoundsounceg and t for the weighing unit.  
- 4 -  
 
SECTION 5 DISPLAYS  
The LCD display will show a value and a unit to the right of the digits.  
In addition there are labels for TARE, GROSS weight, ZERO  
battery  
and for Low  
Low Battery Symbol  
Parts Counting Units  
Stability Symbol  
g/pcs  
oz %  
HI  
GROSS  
TARE  
OK  
888888  
ZERO  
LO  
tkglb  
Checkweighing Symbols  
Weighing Units  
- 5 -  
 
QHW digital weighing scales user’s guide  
SECTION 6 OPERATION  
6.1 ZEROING THE DISPLAY  
You can press the ZERO/ENTER key at any time to set the zero point from which all  
other weighing and counting is measured, within 4% of power up zero. This will  
usually only be necessary when the platform is empty. When the zero point is  
obtained the display will show the indicator for zero.  
The scale has an automatic rezeroing function to account for minor drifting or  
accumulation of material on the platform. However you may need to press the  
ZERO/ENTER key to rezero the scale if small amounts of weight are shown when the  
platform is empty.  
6.2 TARING  
Zero the scale by pressing the ZERO/ENTER key if necessary. The zero indicator will  
be on.  
Place a container on the platform, a value for its weight will be displayed.  
Press the TARE key to tare the scale. The weight that was displayed is stored as the  
tare value and that value is subtracted from the display, leaving zero on the display.  
The "TARE" indicator will be on. As product is added only the weight of the product  
will be shown. The scale could be tared a second time if another type of product was  
to be added to the first one. Again only the weight that is added after taring will be  
displayed.  
When the container is removed a negative value will be shown. If the scale was tared  
just before removing the container this value is the gross weight of the container plus  
all product that was removed. The zero indicator will also be on because the platform  
is back to the same condition it was when the ZERO/ENTER key was last pressed.  
6.3 WEIGHING A SAMPLE  
To determine the weight of a sample first tare the empty container then place the  
sample in the container. The display will show the weight and the units of weight  
currently in use.  
6.4 PERCENT WEIGHING  
The scale will allow a sample weight to be shown as 100%. Then any other weight  
placed on the scale will be displayed as a percentage of the original sample. For  
example is 350g is placed on the scale and the % key is pressed the display will  
show 100.00%.  
Removing the 350g weight and putting a 300g weight on the scale the display will  
show 85.71% as 300g is 85.71% of 350g.  
Note: the scale may jump by large numbers unexpectedly if small weights are used to  
set the 100% level.  
For example if only 23.5g is on a scale with 0.5g increments  
and the scale is set to 100%, the display will show 100.00%, however a small change  
- 6 -  
 
of weight will cause the display to jump to 102.13% as one scale division (0.5g)  
increase to 24.0g will be equivalent to a 2.13% increase.  
Removing the 350g weight and putting a 300g weight on the scale the display will  
show 85.71% as 300g is 85.71% of 350g.  
Pressing the FUNC key will return the scale to weighing.  
6.5 PARTS COUNTING  
When the scale is showing weight, pressing the FUNC key will start the parts  
counting function.  
Before beginning, tare the weight of any container that will be used, leaving the  
empty container on the scale. Place the number of samples on the scale. The  
number should match the options for parts counting, 10, 20, 50, 100 or 200 pieces.  
Press the FUNC key to begin. The scale will show "SP 10" asking for a sample  
size of 10 parts. Change the sample size by pressing the TARE/Ï key. the display  
will cycle through the options: 10,20, 50, 100, 200 and back to 10.  
Press the ZERO/ENTER key when the number matches the number of parts used for  
the sample. As more weight is added the display will show the number of parts  
(pcs).  
Press the % key to display unit weight (g/pcs), Total weight (kg) or the count (pcs).  
Press the FUNC key to return to normal weighing.  
6.6 CHECK-WEIGHING  
Check-weighing is a procedure to cause an alarm to sound when the weight on  
the scale meets or exceeds values stored in memory. The memory holds values  
for a high limit and a low limit. Either limit can be used or both can be used.  
Press the LIMIT key. The display will show the current High Limit with the left most  
digit flashing and the HI symbol on to the left of the display..  
To change the value shown use the %/Í and the LIMIT/Î to select the digit to  
change. Then use the TARE/Ï key to increment the flashing digit. When the  
desired value is shown press the ZERO/ENTER key to accept the value. If you  
want to reset the value to zero press the FUNC/C key to clear the value.  
After pressing the ZERO/ENTER key the display will then show the Low Limit, the LO  
symbol will be on to the left side of the display.  
Enter the low limit in the same way the high limit was entered.  
After pressing the ZERO/ENTER key the scale will return to weighing with the  
Check-weighing function enabled.  
When a weight is placed on the scale the arrows will show if the weight is above or  
below the limits and the beeper will sound as described below.  
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QHW digital weighing scales user’s guide  
BOTH LIMITS SET  
The display will show OK and the beeper will sound when the weight is  
between the limits.  
LOW LIMIT SET,  
HIGH LIMIT is set to zero  
The display will show OK and the beeper will sound when the weight is  
less than the Low Limit. Above the Low Limit the display will show  
HIGH and the beeper will be off.  
HIGH LIMIT SET,  
LOW LIMIT is set to zero  
The display will show LOW and the beeper will be off when the weight  
is less than the High Limit. Above the High Limit the display will show  
OK and the beeper will be on.  
BOTH LIMITS SET.  
LOW IS SET GREATER THAN HIGH  
The beeper will never sound and the display will show LOW if the  
weight is less that the LOW limit, and HIGH if the weight is greater than  
the Low Limit.  
NOTE: The weight must be greater than 20 scale divisions for the check weighing to  
operate.  
To disable the Check-Weighing function enter zero into both limits by pressing the  
FUNC/C key when the current limits are shown then pressing the ZERO/ENTER key  
to store the zero values.  
6.7 ACCUMULATED TOTAL  
The scale can be set to accumulate automatically when a weight is added to he scale  
or manually by pressing the PRINT key.  
See the PARAMETERS Section for  
details of selecting the method. The accumulation function is only available when  
weighing. It is disabled during percent weighing or parts counting.  
6.8 MANUAL ACCUMULATION  
When the scale is set to manual accumulation the weight displayed will be stored in  
memory when the PRINT key is pressed and the weight is stable.  
The display will show "ACC 1" and then the total in memory for 2 seconds before  
returning to normal. If the optional RS-232 interface is installed the weight will be  
output to a printer or PC.  
Remove the weight, allowing the scale to return to zero and put a second weight on.  
Press PRINT, the display will show "ACC 2" and then show the new total.  
Continue until all weights have been added.  
To view the totals in memory press the PRINT key when the scale is at zero. The  
display will show the total number of items "ACC xx" and the total weight before  
returning to zero.  
The totals will also be printed via the RS-232 interface.  
To erase the memory press PRINT to view the totals and then press the FUNC/C key  
to clear the memory.  
- 8 -  
 
6.9 AUTOMATIC ACCUMULATION  
When the scale has been set to Automatic Accumulation the value is stored in  
memory automatically.  
Add a weight to the scale, the beeper will sound when the scale is stable to signify  
the value is accepted. Remove the weight.  
The display will show "ACC 1" and the totals in memory when the scale returns to  
zero.  
Adding a second weight will repeat the process.  
While the weight is on the scale it is permissible to press the PRINT key to store the  
value immediately. In this case the scale will not store the value when the weight is  
removed.  
The totals can be viewed as above.  
In all cases the scale must return to zero or a negative number before another  
sample can be added to the memory.  
More product can then be added and PRINT pressed again. This can continue for up  
to 99 entries, or until the capacity weight display is exceeded.  
- 9 -  
 
QHW digital weighing scales user’s guide  
SECTION 7 BATTERY OPERATION  
The scales can be operated from the battery if desired. The battery life is  
approximately 100 hours.  
When the battery needs charging the arrow above the low battery symbol under the  
weight display will turn on. The battery should be charged as soon as the arrow  
above the symbol is on. The scale will still operate for about 10 hours after which it  
will automatically switch off to protect the battery.  
To charge the battery simply plug into the mains power. The scale does not need to  
be turned on.  
The battery should be charged for 12 hours for full capacity.  
Just under the quantity display is an LED to indicate the status of battery charging.  
When the scale is plugged into the mains power the internal battery will be charged.  
If the LED is green the battery has a full charge. If it is Red the battery is nearly  
discharged and yellow indicates the battery is being charged.  
As the battery is used it may fail to hold a full charge. If the battery life becomes  
unacceptable then contact your distributor .  
- 10 -  
 
SECTION 8 RS-232 OUTPUT  
The QHW Series of scales can be ordered with an optional RS-232 output.  
Specifications:  
RS-232 output of weighing data  
ASCII code  
4800 Baud  
8 data bits  
No Parity  
Connector: 9 pin d-subminiature socket  
Pin 2  
Output  
Pin 3 Input, not used at this time  
Pin 5 Signal Ground  
Data Format for normal weighing operations, parts counting or recalling of totals from  
memory will all be different. Examples follow:  
Normal Output  
GS  
1.234kg  
GS for Gross weight, NT for net weight and a unit of  
weight  
No..  
1
This number increments every time a new value is  
stored in memory  
Total 1.234kg  
<lf>  
<lf>  
The total value stored in memory  
Includes 2 line feeds  
When percent weighing the output is the weight shown in percent only.  
GS  
<lf>  
<lf>  
100.00%  
GS for Gross weight, NT for net weight and a unit of weight  
Includes 2 line feeds  
- 11 -  
 
QHW digital weighing scales user’s guide  
SECTION 9 PARAMETERS  
The scale has 6 parameters that can be set by the user. These allow the user to set  
the scale to:  
Display the weight in other increments of weight to minimize the affects of  
vibration, wind or other environmental conditions.  
Control the back light on the display. It may be necessary to turn the backlight  
off to maximize battery life.  
Set the Accumulation to Automatic, manual or set the RS-232 interface to  
continuously print the weight.  
Set whether accumulation when print  
Set auto zero range  
Select another weighing unit than the standard.  
To set parameters press the FUNC and PRINT keys at the same time.  
The display will show "Inc xx" The first value shown is the default scale increment  
value. To select a different increment value press the TARE/Ï key to change the  
value then press the ZERO/ENTER key.  
For example on a 15kg scale the standard increment is 0.5g, the value can be  
changed to 1.0g or 2.0g.  
The next parameter is control of the backlight. The standard is to have the backlight  
operate automatically, turning off when the scale is not used. The backlight can be  
set to be "EL On" , "EL Au" (Automatic) or "EL Off". The maximum battery life  
is achieved with the backlight turned off.  
Press the TARE/Ï key to change the value then press the ZERO/ENTER key.  
Automatic accumulation is next. With "Au On" the memory will accumulate the  
weight automatically, "Au Off" will enable the manual accumulation and with "P  
Cont" set the RS-232 interface will send the weight continuously and the  
accumulation function is disabled.  
Press the TARE/Ï key to change the value then press the ZERO/ENTER key.  
Whether accumulation when print is next, With “ACC ON” when you print it will  
accumulation, “ACC OF” will only print without accumulation.  
Press the TARE/Ï key to change the setting then press the ZERO/ENTER key.  
Auto zero range is next, you can select 0.5d, 1d, 2d and 4d.  
Press the TARE/Ï key to change the setting then press the ZERO/ENTER key.  
The displayed unit of weight is set next. The scales are normally calibrated and  
display in kilograms, however they will show the weight in grams, ounces or pounds  
and selected by this function.  
Press the TARE/Ï key to change the value then press the ZERO/ENTER key.  
When the scales are set to display in other units of weight the accumulation function  
is still keeping the weight in kilograms.  
- 12 -  
 
SECTION 10 CALIBRATION  
10.1 Linear calibrate  
To start calibration turn the scale off and then turn it back on. Press the limit and %  
keys together during the initial counting from 9 to 0 on the display.  
The display will show "unLoAd". Remove all weight from the pan and then press the  
ZERO/ENTER key to set the initial zero point.  
The display will then show the first calibration weight request. Put this weight on the  
platform and then press the ZERO/ENTER key when stable. The scale should be  
stable before pressing the ZERO/ENTER key to accept a weight. The stability  
indicator will turn on to show the value is stable.  
After all calibrate weight completed, press ZERO/ENTER to complete the calibration.  
The scale will begin counting back to zero after the last weight has been selected.  
Calibration weights  
QHW SERIES  
Model #  
Weight 1  
Weight 2  
Weight 3  
QHW 3  
zero  
1000g  
3000g  
QHW 6  
zero  
2kg  
QHW 15  
zero  
5kg  
15kg  
QHW 30  
zero  
10kg  
6kg  
30kg  
10.2 Normal calibrate  
To start calibration turn the scale off and then turn it back on. Press the Tare and %  
keys together during the initial counting from 9 to 0 on the display.  
The display will show "unLoAd". Remove all weight from the pan and then press the  
ZERO/ENTER key to set the initial zero point.  
Then use %, Limit and Tare key to key in calibrate weight, press Zero key to sure,  
display shows “load”, put this weight on platter, after stable indicator on, press Zero  
key to sure.  
After selfchecking again, QHW is ready for you.  
- 13 -  
 
QHW digital weighing scales user’s guide  
SECTION 11 ERROR CODES  
During the initial power-on testing or during operation it is possible the scale may  
show an error message. The meaning of the error messages is described below.  
If an error message is shown repeat the procedure that caused the message, turning  
the balance on, calibration or other functions. If the error message still is shown  
then contact your dealer for further support.  
ERROR CODE DESCRIPTION  
POSSIBLE CAUSES  
Err 4  
Initial Zero is greater than Weight on the pan when turning the  
allowed (4% of maximum scale on.  
capacity) when power is Excessive weight on the pan when  
turned on or when the zeroing the scale.  
ZERO/ENTER  
pressed,  
key  
is Improper calibration of the scale.  
Damaged load cell.  
Damaged Electronics.  
Err 5  
Err 6  
Keyboard Error.  
A/D count is not correct Platform not installed.  
Improper operation of the scale.  
when turning the scale on.  
Load cell damaged.  
Electronics damaged.  
To view the A/D count press the ZERO/ENTER key and the % key at the same time  
while the scale is performing the initial check at power-on. Press ZERO/ENTER to  
return to normal.  
- 14 -  
 

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