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Intelligent Weighing Technology QHD+15, Service Manual

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Intelligent Weighing Technology QHD+15 Service Manual Download Page 1

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.

Summary of Contents for QHD+15

Page 1: ...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 ...

Page 2: ...on 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...

Page 3: ...ce 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 ...

Page 4: ...ning 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 ...

Page 5: ...he 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 modu...

Page 6: ...ell 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 t...

Page 7: ...ct 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 presse...

Page 8: ...ght 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 ...

Page 9: ...ce 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 dis...

Page 10: ...e 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...

Page 11: ...s 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 a...

Page 12: ...ece 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...

Page 13: ...tore 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 during the 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 ...

Page 14: ...eep 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 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 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 Note that this method is only used...

Page 15: ...ld 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 ...

Page 16: ...lect 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 ...

Page 17: ...three minutes later 5 Scale 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 req...

Page 18: ...t 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 ...

Page 19: ...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...

Page 20: ... 20 Send PLU text data to be stored with current TARE and U W values ie SPLU01 Parts CR ...

Page 21: ...nd wait for stable indicator Press to confirm Display will be shown Set weight value will be required Enter the value by using numeric keys Press to confirm Display will be shown Place the calibration weight on the platform and wait few seconds for display stable Press to confirm After the calibration scale will start a self test remove the weight during that time and display will return to weighi...

Page 22: ...the password Default password is 0000 and press to confirm Pi n Select the scale by pressing which should be configured and press to confirm Tech local remote Use the key to select the weighing unit kg lb and press to confirm Tech unit cnt Use the key to scroll to select individual menu Confirm selected menu by pressing Press key escape from the menu and exit to weighing mode ...

Page 23: ...cale division I nc 5 I nc 10 I nc 20 Di v I nc 50 Set division Azn 0 5d Azn 1d Azn 2d A 2t Azn 4d Automatic zero tracking 0 auto 0 0 auto 2 0 auto 5 0 auto 10 0 Auto 0 auto 20 Zero setting range after switching on the scales to zero 0 manl 0 0 manl 2 0 manl 4 0 manl 10 0 manl 50 0 manl 0 manl 100 Zero setting range the display is set to zero by pressing Pi n 1 Enter new password Pi n Pi n 2 Re ent...

Page 24: ...ror Check the keys and connecter Err 6 A D value out of range Make sure platform empty and check the pan is installed proper Check the load cell connectors Err 9 Unstable Reading Check any air variation vibration RF noise and touching some where Check the load cell and connecters Err 17 Tare out of range Remove the load and restart scale again ol Over range Remove the load Re calibrate Fai l h fai...

Page 25: ...he load cell connections and all OL or appear the display Maximum capacity exceeded Power supply faulty Check all power cables and connecters Calibrate again with correct calibration weights Load cell damaged Check load cell connections or Lo Weight is below permissible limit Check the pan installed correctly Calibrate again with correct calibration weights Power Supply faulty Check all power cabl...

Page 26: ...oad cell connections and connectors Can not use scale full capacity Before weighing make sure zero indication is showing and scale is empty Check the weighing mode Check the load cell is fitted proper and touching housing or hitting somewhere Calibrate again with exact calibration mass weights Load cell damaged Check load cell connections and connectors Main PCB problem Battery not charging Mains ...

Page 27: ...s depends on the conditions to use CHANGE PARTS 1 Replace main board Remove adaptor pin from the jack Remove the pan Remove the five screws from the bottom of housing securing the front and back halves of the cover Disconnect the power connector display connector and load cell cable Disconnect the ground cable from the main PCB Remove the main PCB from the back cover Carefully remove the main PCB ...

Page 28: ...B s for avoid damage Disconnect load cell connections from the PCB Remove the four foots from the bottom cover Remove the four screws from the upper bracket Remove the bracket with load cell from the cover Bracket set place on the table Remove the allen screws from the top and bottom brackets by using 5mm allen key Load cell will get separate from the bracket Install the new load cell Fix the brac...

Page 29: ...an Check the connectors are connected proper Check the keyboard Check the display board and main PCB Check the load cell Check the battery If any component damaged replace it Close the housing Install the pan and check its lying proper there Checking Load cell Remove the top cover from the scale Remove power connecter from the main board Make sure load cell cable connections are proper and no insu...

Page 30: ...r excitation voltage is reaching the load cell check the output signal If load cell has an unusual signal replace that load cell Checking Voltages Using a multimeter check the mains voltage Check the adaptor is outputting a voltage 9 VDC Check PCB input voltage 9VDC Check battery voltage of at least 6 VDC ...

Page 31: ... 31 12 CIRCUIT DIAGRAM ...

Page 32: ... 32 ...

Page 33: ... 33 13 DRAWING ...

Page 34: ... Load cell lower bracket 1 Aluminum 16 Self thread Screw 4 S18C 4x10 17 Insulative Washer 4 EDPM 8x3 1x1 2t 18 Power Socket 1 19 Power Socket Spacer 1 PC 20 Power Switch 1 21 Foot 4 PVC 22 Key board 1 23 Front display overlay 1 24 Level bubble 1 14 7mm 25 Screw 1 M4x35 26 Front Display PCBA 1 27 Insulative Washer 5 EDPM 8x3 1x1 2t 28 Star Self thread screw 5 20Mn M3x20 29 Star Self thread screw 5 ...

Page 35: ...e lb kg Interface Bi directional RS 232 Interface Stabilization Time 2 Seconds Operating Temperature 0 C 40 C 32 F 104 F Power supply AC Adaptor 9 V 800 mA Battery 6V4AH Calibration Automatic external Display 3 x 6 digits LCD digital display with white LED back light Housing Indicator ABS Plastic Stainless Steel pan Pan size 225 x 300mm 8 9 x 11 8 Overall dimensions 320 x 340 x 125mm 12 6 x 13 4 x...

Page 36: ...tion to load cells plus shield Maximum cable length 6 meters Termination 9 pin d subminiature plug on scale Specification for Local Scale Load Cell Model No C2X1 Rated Capacity 6 50 kg Rated Out put 2 0 mV V 0 2 mV V Excitation Voltage 20 VDC IP Level IP64 Material Aluminum Alloy Cable Φ8 2 four core shield Input Resistance 420Ω 30Ω Out put Resistance 350 Ω 5 Ω Temperature Range 10 C 50 C Safe ove...

Page 37: ... re really buying peace of mind Quality Scales and balances solidly built from the ground up with superior engineering and components for exacting results Value From bench scales to analytical balances weighing equipment priced for real world business applications with superior service and support Experience Expert advice to help you choose just the right product for your application Quality Value...

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