LG QHW 15 User's Manual
Contents
1. of Enter key when setting parameters or other functions Tare or D 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 A of incrementing the active digit when setting a value for parameters or other functions Lim or vr Sets the limits for check weighing Allows setting of either the low limit or the high limit or both Secondary function gt 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 4 is to move the active digit to the left when setting values for parameters or other functions Func or ay 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 ina parameter set2. 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 Be 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 asecond 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 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 so
3. r SCALE QHW series Digital Weighing Scales User s guide UGQHW E0204 Contents SEGTIONSUINTRODUC TION 0 een 1 SECTION 2 SPECIFICATIONS Asa see nal 2 SECTION 3 INSTALLATION seen ea 3 3 T General Installation tl es 3 3 2 Install OT GIVE series see euch ek 3 SECTION 4 KEY DESCRIPTION Soda aa 4 SECTION 5 DISPLAY Ss ur ae 5 SEG TIONG OPERATION en ee 6 62ti Zeroing Medi pls eek 6 8 2 Taing ersehen 6 6 2 Weighing a samples erahnen 6 6 4 Percent Welt rrtorraio oa 6 9 5 Parts COUINO scek tetera een 7 6 6 GRECK WSlIONIN O osvaldo lidera licita 7 6 7 Accumulated total sisan rn NN dd 8 6 8 Manual aceumulalion s alas en ee Bee 8 6 9 Automatic acellmulalionzer sans een caia 9 SECTION 7 BATTERY OPERATION osorno aiii bd 10 SECTION 8 HS232 OUTPUT ae use 11 SECTION 9 PARAMETERS u nee eat 12 SECTION 10 CALIBRATION Era ee bee eens 13 SECTION 11 ERROR CODES See een 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 a
4. 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 then contact your dealer for further support If the error message still is shown 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 key is Improper calibration of the scale pressed Damaged load cell Damaged Electronics Err 5 Keyboard Error Improper operation of the scale Err 6 A D count is not correct Platform not installed 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 return to normal 5 Press ZERO ENTER to
5. ARE 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 26 of we
6. IMIT 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 and the LIMIT gt to select the digit to change Then use the TARE M 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 F 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 bee
7. ight 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 A 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 L
8. larm 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 QHW digital weighing scales user s guide SECTION 2 SPECIFICATIONS QHW SERIES Model QHW 3 QHW 6 QHW 15 QHW 30 Maximum Capacity 3kg 6kg 15kg 30kg Readability 0 1g 0 2 0 5 1g Resolution 1 30000 1 30000 1 30000 1 30000 Tare Range 3kg 6kg 10kg 30kg Minimum Capacity 29 4g 10g 20g Repeatability Std Dev 0 1 0 2 0 59 1g Linearity 0 29 0 4 tg 29 Units of Measure kg g Lb oz Common Specifications Interface RS 232 Output Optional Stabilisation Time 2 Seconds typical Operating Temperature 0 C 40 C 32 F 104 F Power supply external 115 230 Vac 50 60Hz 10 watts Calibration Automatic External Display 6 digits LCD digital display Draft shield N A Balance Housing ABS Plastic Stainless Steel platform Pan Size 225 x 300mm 8 9 x 11 8 Overall Dimensions wxdxh 320 x 340 x 125mm 12 6 x 13 4 x 4 9 Gross Weight 3 8kg 8 4lb Applications General Purpose Scale Functions Weighing parts counting weight Check weighing Other Features and Specs Internal rechargeable battery 70 hours operation SECTION 3 INSTALLATION 3 1 GENERAL INSTALLATION The scales should be sited in a locatio
9. n 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 QHW 3 QHW 6 QHW 15 QHW 30 Weight 1 zero zero zero zero Weight 2 1000g 2kg 5kg 10kg Weight 3 3000g 6kg 15kg 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 48 show an error message 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
10. n 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 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 _j
11. on 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 Pin2 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 This number increments every time a new value is stored in memory Total 1 234kg The total value stored in memory lt If gt Includes 2 line feeds lt lf g
12. per 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
13. t When percent weighing the output is the weight shown in percent only GS 100 00 GS for Gross weight NT for net weight and a unit of weight lt lf gt Includes 2 line feeds lt lf gt 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 e Display the weight in other increments of weight to minimize the affects of vibration wind or other environmental conditions e Control the back light on the display It may be necessary to turn the backlight off to maximize battery life e Set the Accumulation to Automatic manual or set the RS 232 interface to continuously print the weight e Set whether accumulation when print e Set auto zero range e 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 4 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 tobe EL On EL Au Automatic or EL Off The maximum battery life is achieved
14. ting mode U key This key will select either kilograms pounds ounce g and t for the weighing unit 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 Aand for Low battery Low Battery Symbol _ Stability Symbol Parts Counting Units TAN g pes HI GROSS OZ 8888 LO ZERO tkglb y Checkweighing Symbols Weighing Units 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 T
15. with the backlight turned off Press the TARE M 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 M 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 M 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 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 M 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 O on the display The display will show unLoAd Remove all weight from the pa
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