Adam Equipment CBK SERIES Service Manual
Contents
1. D converter AU1 Y Microprocessor DU1 and Y Power supply battery charger circuits DUS T2 NOTE The wiring instruction for the transformer Input Voltage Wires 230 VAC 50 60 Hz Red amp Yellow 115 VAC 50 60 Hz Blue amp Yellow 6 0 LOAD CELL DAMAGE The most common reason a scale fails is that the load cell has been damaged The damage can be from 2 primary causes The first is physical damage due to an overload or an impact from the side and the second is damage due to the environment such as moisture extreme heat or a cut cable if the cables are exposed Adam Equipment Company 2007 8 PRINCIPLE OF OPERATION The stain gauge load cell is a method of measuring the amount of stress put onto a metal structure due to a weight being supported by the structure The stress is measured using 4 strain gage sensors mounted in a particular way on the metal structure These 4 strain gauges are connected in such a way that they form a wheatstone bridge See figure below In the simplest load cells there are only the 4 resistances of the strain gages to consider Normally without a load on the load cell all the resistances are the same However when the load cell has a weight on it 2 of the strain gages will be in compression A and D and the resistance will decrease and 2 will be in tension B and C and their resistance will increase m m g gut E j ma NA a gt Cae p TY s gt NA Pe NS2. Display is unstable Weight value incorrect Cannot use Full Capacity Not Linear Adam Equipment Company 2007 POSSIBLE CAUSE Power Switch faulty or not connected Battery not charged or faulty Power supply faulty or incorrect type Maximum capacity exceeded Load Cell damaged Electronics is faulty Drafts or air currents Obstruction under pan Sample is moving animal weighing Vibrations through table Temperature changed dramatically Electronics faulty or Battery low Calibration error Recalibrate Unit calibrated with inaccurate weight Balance not level Obstruction between sample pan Wrong unit of weight displayed Over load Stops hitting pan support or hitting bottom of load cell Electronics faulty Parameters set incorrectly Load Cell Damaged Overload stops hitting too soon Faulty factory calibration Off Centre Loading error Overload Stops not correct Obstruction under pan Battery will not charge Charging circuit failure Battery Failure Incorrect adapter below 800 mA Processor failure 4 0 ERROR CODES ERROR DESCRIPTION POSSIBLE CAUSES CODE Err 1 Time input Error Invalid time entry such as 268970 for the time format H m Err 2 Date input Error 34 day of a month is an invalid entry Err 4 Initial Zero is greater than Weight on the pan when turning the allowed 4 of maximum scale on capacity when power is turned Excessive weight on the pan
3. F6 SCS is shown The display will show if the successive tare is tf ON or tr OFF Press the Func key to scroll through the options Press Tare to accept the displayed value and return to the parameter or press the Zero key to return to the parameter without changing the value Then press Func to advance to the next parameter 7 7 FI A D COUNT To enter this parameter press the Tare key when FI Ent is shown This parameter allows you to view the A D counts from the internal A D converter This can be an aid to service Adam Equipment Company 2007 15 Press the Tare key to return to the PARAMETER menu Typical value at zero is 30 000 90 000 approx Typical value at full capacity is 500 000 approx 7 8 ZERO This parameter allows the normal method of setting zero To enter this parameter press the Tare key when F8 ZEM is shown The display will show the current settings ModE 1 or ModE 2 Press the Func key to scroll through the options Press Tare to accept the displayed value and return to the parameter or press the Zero key to return to the parameter without changing the value Then press Func to advance to the next parameter 7 9 F9 LOW VOLTAGE DETECTION This parameter allows detection of low voltage when the battery wears down To enter this parameter press the Tare key when F9 Ltl M is shown The display will show if the LVD Mode is set to OM
4. Repeatability S D 0 0001 kg 0 0001 kg 0 0002 kg 0 0005 kg 0 001 kg 0 002 kg Linearity 0 0002 kg 0 0002 kg 0 0004 kg 0 001 kg 0 002 kg 0 004 kg Grams Maximum Capacity 4000 g 8000 g 8000 g 16000 g 32000 g 48000 g Readability 0 1g 0 19 0 29 0 5g 1g 2g Repeatability S D 0 1 g 0 1 g 0 2 g 0 50 10 2g Linearity 0 29 0 29 0 4 g 1g 29 4 g OTHER SPECIFICATIONS Units of measure CBK Series kg g CBKa Series kg g lb oz Ib oz Interface RS 232 bi directional Interface Stabilisation Time 2 Seconds typical Operating Temperature 10 C to 40 C 14 F to 104 Power supply 230 VAC 50 60 Hz 115 VAC available Battery Internal rechargeable battery 90 hours operation Calibration Automatic External Display 6 digits LCD digital display with capacity tracker and symbols for units Scale Housing ABS Plastic Stainless Steel platform Pan Size 225 x 275 mm 8 9 x 10 8 Overall Dimensions 315 x 355 x 110 mm wxdxh 12 4 x 14 x 4 3 Net Weight 4 1 kg 9 Ib Applications Weighing Scales Functions Weighing Parts counting weighing Check weighing Check counting Accumulation of weights Date Time Real Time Clock RTC To print date and time information battery backed For USA models Ib is always enabled when the power is turned on and are calibrated in Ib unit Adam Equipment Company 2007 5 3 0 TROUBLESHOOTING PROBLEM Display is blank No turn on test oe eee appears on display
5. or OFF Press the Func key to scroll through the options Press Tare to accept the displayed value and return to the parameter or press the Zero key to return to the parameter without changing the value Then press Func to advance to the first parameter Adam Equipment Company 2007 16 8 0 WIRING DIAGRAM 7000009 ooo BOVD0O DOBE TITLE C ADAM EQUIPMENT CO LTD CBK Mains Power Wiring Diagram REVISION A 17 O Adam Eguipment Company 2007 9 0 MECHANICAL ASSEMBLY Mains input connector 1 T T ju jm PULL ENEJ Demi mr m power switch T T MR DT m LI screw front display PCB Assy ES upper cover za rear blank overlay ABS pan ES SST pan PART NO RANE cwm Pouer Dom bo se proved bee om pate oceta Adam Equipment Company 2007 18 CE Manufacturer s Declaration of Conformity This product has been manufactured in accordance with the harmonised European standards following the provisions of the below stated directives Electro Magnetic Compatibility Directive 89 336 EEC Low Voltage Directive 73 23 EEC Adam Equipment Co Ltd Bond Avenue Denbigh East Milton Keynes MK1 1SW United Kingdom FCC COMPLIANCE This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed
6. to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment The equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense Shielded interconnect cables must be employed with this equipment to insure compliance with the pertinent RF emission limits governing this device Changes or modifications not expressly approved by Adam Equipment could void the user s authority to operate the equipment WEEE COMPLIANCE ay Sealed Lead Acid v 4 Battery a s Must be recycled Properly Any Electrical or Electronic Eguipment EEE component or assembly of parts intended to be incorporated into EEE devices as defined by European Directive 2002 95 EEC must be recycled or disposed using techniques that do not introduce hazardous substances harmful to our health or the environment as listed in Directive 2002 95 EC or amending legislation Battery disposal in Landfill Sites is more regulated since July 2002 by regulation 9 of the Landfill England and Wales Regulations 2002 and Hazardous Waste Regulations 2005 Battery recycling has become topical and the Waste Electrical and Electronic Eq
7. www adamequipment com Adam Equipment Company 2007
8. 10 VOLT POWER JE CN 10 VOLT POWER LE PPL x gt SUPPLY pe iv pK N Z i d de 3 SE s lt e di is d ST k s A Ed X K 4 s S SON Z na 6 Ne g a PN z dl NA pe N N k M A lt Vout O VOLTS Vout 0 028 VOLTS 28mv BETWEEN S AND s BETWEEN S AND s E E UNBALANCED BRIDGE FULL CAPACITY LOAD BALANCED BRIDGE ON THE LOAD CELL This will cause the bridge to become unbalanced When the bridge has a voltage across it from E to E then the signal output at S and S will show a voltage of zero volts with no load and a small voltage proportional to the load as the load is increased Typical load cells show 20 30mv of signal if the excitation voltage is 10volts and the load cell is fully loaded Most load cells used in scales are not as simple as this example They have additional resistance elements added to compensate for temperature variations and to set the outputs to correct voltages The circuit of a typical load cell is shown below Adam Equipment Company 2007 9 lemperakre conection 10 VOLT POWER SUPPLY BALANCED BRIDGE A method to check the basic function and integrity of a load cell can be done using a ohmmeter and voltmeter with up to a 10volt power supply Before the load cell is connected to the power supply use the ohmmeter to measure the resistance between the wires Typical resistance values are E to E 410 ohms 30 ohms S to S 350 ohms 2 ohms E to S or
9. HADDAM Adam Equipment CBK SERIES Service Manual Software Rev 4 28 amp above 4 25H amp above for CBK 8H 16aH ADAM EQUIPMENT CO LTD P N 8735 Rev A3 August 2007 Adam Equipment Company 2007 Adam Equipment Company 2007 CONTENTS jS INTRODUCTION le lea lt lace ea een 3 2 0 SPECIFICATIONS ona a li nains 4 30 TROUBLESHOOTING 6 4 0 ERROR CODES adi e aria Orto n 7 50 SOBICDESORIETIDIN atta ee nade eh ea qd Sha eo EU ea Sen a 5444 Bo 8 6 0 LORD GELU DAMAGE aortas e ai a Tra la ll 8 AU FACTORY PARAMETERS En nie nanas ste 12 7 1 FI CALEIBRATION asa saa a dd 13 7 2 WEE RESOLUTION t mes 14 vu UE CAPACITY ate We ICT AC Alek te 14 T4 BHENITIAEZERO RANGE titanate izol ala 14 7 93 MORE ZERORANGE gale ee een 15 76 Fo SUCCESSIVE TARE ooo Boi Rodu a tata lid 15 Zo ARR DODO Watta de ode ones en l bent 15 7285 ZZERO Cotton oo o o o id A dd 16 7 9 V KOWMOLTAGEDETEGTION ee eee eee 16 8 0 WIRING DIAGRAM Een 17 9 0 MECHANICAL ASSEMBLY 00a 18 Adam Equipment Company 2007 1 Adam Equipment Company 2007 1 0 INTRODUCTION e The CBK range of scales provides an accurate fast and versatile general purpose weighing scales with parts counting percent weighing and check weighing functions e There are two series within the range The CBKa series are similar to the CBK series except the CBKa scales can operate in both imperial and metric weighi
10. HE SCALE The signal from the load cells is amplified by the circuits on the A D circuit board The signal needs to be amplified to make it acceptable for the A D converter used The CBK M scales amplify the input by 200 and change the no load voltage to about 2 5V The amplified and offset voltage is measured at pin 6 of IC7 the INA118P amplifier IC This voltage is sent to the filter and then to the A D converter Adam Equipment Company 2007 11 7 0 FACTORY PARAMETERS The factory parameters are used for setting the capacity and basic settings Switch off the scale and then switch on again Press Tare during the initial self test The display will ask for a code number P Enter the number 2006 and press Tare The display will show the first parameter 1 GAL To scroll through other parameters press the Func key The display will show the parameter number then the word describing the function Press the Tare key to enter a parameter Press the Zero key to exit a parameter Pressing Zero again will return the scale to weighing When a parameter is entered by pressing the Tare key the display will guide you through the parameter selected and the options available The parameters available are To enter the Calibration Resolution selection not valid for approved units Select Capacity Initial Zero Range Re Zero Range Successive Tare Enable Display the A D counts Set zero method Set low voltage d
11. any other combination similar approximately 270 ohms If the load cell has Sense connections in addition they are connected to the excitation internal to the load cell Connect the load cell E and E to a power supply typically 10 volts Never use more than 12 volts as it may damage the load cell Measure the voltage between S and S With no load the voltage should be approximate Omv 3mv With a mass on the load cell the output voltage should increase The amount by which it increases will be dependent upon the sensitivity of the load cell capacity of the load cell the excitation voltage and the amount of mass placed on the load cell Most load cells have a sensitivity of either 2mv V or 3mv V Adam Equipment Company 2007 10 The expected change to the output is Vout 2mv V Vext Mass capacity of load cell For example a 2mv V load cell of 30Kg capacity with 20Kg placed on it Vext is 5 volts would give a output of approximately Vout 2mv V Vext Mass 2mv V 5V 20Kg 6 7mv capacity of load cell 30kg If the load cell has been damaged the no load voltage will likely be greater than 3mv or the loaded voltage will be grossly different from the expected value Remember the loaded voltage will be offset by the amount of zero load voltage measured The load cell can be tested while it is connected to the A D converter circuit board using the scale power supply for excitation voltage TESTING LOAD CELLS IN T
12. are Range 4000 g 8000 g 8000 g 9999 5 g 32000 g 48000 g Readability 0 1g 0 19 0 29 0 50 10 29 Repeatability S D 0 1 g 0 1 g 0 2 g 0 5 g 1g 2g Linearity 0 2 g 0 2 g 0 4 g 1g 29 4g CBKa Series USA models CBK 8a CBK 16aH CBK 16a CBK 35a CBK 70a CBK 100a Pounds Maximum Capacity 8 Ib 16 Ib 16 bb 35 Ib 70 Ib 100 Ib Tare Range 8 Ib 9 9995 Ib 9 9995 Ib 35 Ib 70 Ib 99 Ib Readability 0 0002 Ib 0 0002 Ib 0 0005 Ib 0 001 Ib 0 002 Ib 0 005 Ib Repeatability S D 0 0002 Ib 0 0002 Ib 0 0005 Ib 0 001 Ib 0 002 Ib 0 005 Ib Linearity 0 0004 Ib 0 0004 Ib 0 001 Ib 0 002 Ib 0 004 Ib 0 01 Ib Ounces Maximum Capacity 128 oz 256 oz 256 oz 560 oz 1120 oz 1600 oz Readability 0 005 oz 0 005 oz 0 01 oz 0 02 oz 0 05 oz 0 1 oz Repeatability S D 0 005 oz 0 005 oz 0 01 oz 0 02 oz 0 05 oz 0 1 oz Linearity 0 01 oz 0 01 oz 0 02 oz 0 04 oz 0 1 oz 0 2 0z Pounds Ounces Maximum Capacity 8 lb 16 Ib 16 Ib 35 Ib 70 lb 99 Ib 0 0 oz 0 0 oz 0 0 oz 0 0 oz 0 0 oz 15 9 oz Display shows 8 _ 16 00 16 _16 0 16 _16 0 35 _ 16 0 70 _16 0 99 16 0 Readability 0 01 oz 0 1 oz 0 1 oz 0 1 oz 0 1 oz 0 1 oz Repeatability S D 0 01 oz 0 1 oz 0 1 oz 0 1 oz 0 1 oz 0 1 oz Linearity 0 02 oz 0 2 oz 0 2 oz 0 2 oz 0 2 oz 0 2 oz Adam Equipment Company 2007 4 Kilograms Maximum Capacity 4 kg 8 kg 8 kg 16 kg 32 kg 48 kg Readability 0 0001 kg 0 0001 kg 0 0002 kg 0 0005 kg 0 001 kg 0 002 kg
13. etect mode Adam Equipment Company 2007 12 7 1 FH CALIBRATION To enter the calibration parameter press the Tare key when Ff CAL is displayed The display will instruct you to remove any weight from the scale UnloAd Press Tare NOTE USA models are calibrated using Ib unit The display will tell you to add the first weight to the scale Itl 1 00 kg Place the first calibration weight as suggested in the Table below Wait for stability then press the Tare key The display will tell you to add the second weight to the scale Ld 2 00 kg Place the second calibration weight as suggested in the Table below Wait for stability then press the Tare key The display will show PASS if the calibration is OK Or it will show FAIL L if calibration could not be completed correctly Remove the calibration weight The scale will return to weighing Suggested Calibration Weights Models Calibration weight 1 Calibration Weight 2 CBK 4 CBK 8a 2kg 2 b 4 kg 5 lb CBK 8 CBK 16a 4 kg 5 lb 7kg 101b CBK 16 CBK 35a 5 kg 10 Ib 15 kg 30 Ib CBK 32 CBK 70a 10 kg 20 Ib 30 kg 50 Ib CBK 48 CBK 100a 20 kg 40 Ib 40 kg 70 Ib Adam Equipment Company 2007 13 7 2 F2 RESOLUTION NOTE This value can not be changed for the CBK scales 7 3 F3 CAPACITY To enter this parameter press the Tare key when F3 GAP is shown The display will show the curre
14. ng units whereas for the CBK series the imperial units are not available e All models have LEDs to indicate when a weight is below the low limit between the limits or above the high limit next to the display These can work in conjunction with an audible alarm for check weighing as well as LCD showing LO OK and HI e All scales have stainless steel weighing platforms on an ABS base assembly e They are supplied with a RS 232 bi directional interface and real time clock RTC e The scales have sealed keypads with colour coded membrane switches and a large easy to read liquid crystal type display LCD supplied with a backlight e They include automatic zero tracking semi automatic amp pre set tare accumulation facility that allows the weight to be stored and recalled as an accumulated total Adam Equipment Company 2007 3 2 0 SPECIFICATIONS CBK 4 CBK 8H CBK 8 CBK 16 CBK 32 CBK 48 Kilograms Maximum Capacity 4 kg 8 kg 8 kg 16 kg 32 kg 48 kg Tare Range 4kg 8 kg 8 kg 9 9995 kg 32 kg 48 kg Readability 0 0001 kg 0 0001 kg 0 0002 kg 0 0005 kg 0 001 kg 0 002 kg Repeatability S D 0 0001 kg 0 0001 kg 0 0002 kg 0 0005 kg 0 001 kg 0 002 kg Linearity 0 0002 kg 0 0002 kg 0 0004 kg 0 001 kg 0 002 kg 0 004 kg Grams Maximum Capacity 4000 g 8000 g 8000 g 16000 g 32000 g 48000 g T
15. nt capacity Press the Func key to scroll through the options Press Tare to accept the displayed value and return to the parameter or press the Zero key to return to the parameter without changing the value Then press Func to advance to the next parameter NOTE The scale must be originally built for the capacity selected The 4 kg unit uses the 5 kg load cells 8 kg unit uses 10 kg load cells the 16 kg unit uses 20 kg load cells the 32 kg unit uses 35 kg load cells and the 48 kg unit uses 50 kg load cells 7 4 F4 INITIAL ZERO RANGE To enter this parameter press the Tare key when F4 Int is shown The display will show the current initial zero range Press the Func key to scroll through the options Press Tare to accept the displayed value and return to the parameter or press the Zero key to return to the parameter without changing the value Then press Func to advance to the next parameter Adam Equipment Company 2007 14 75 RB RE ZERO RANGE To enter this parameter press the Tare key when Fo re is shown The display will show the current re zero range Press the Func key to scroll through the options Press Tare to accept the displayed value and return to the parameter or press the Zero key to return to the parameter without changing the value Then press Func to advance to the next parameter 7 6 F6 SUCCESSIVE TARE To enter this parameter press the Tare key when
16. uipment WEEE Regulations are set to impose targets for recycling Adam Equipment Company 2007 ADAM EQUIPMENT is an ISO 9001 2000 certified global company with more than 35 years experience in the production and sale of electronic weighing equipment Adam products are predominantly designed for the Laboratory Educational Medical retail and Industrial Segments The product range can be described as follows Analytical and Precision Balances Compact and Portable Balances High Capacity Balances Moisture analysers balances Mechanical Scales Counting Scales Digital Weighing Check weighing Scales High performance Platform Scales Crane scales Medical Scales Retail Scales for Price computing For a complete listing of all Adam products visit our website at www adamequipment com Copyright by Adam Equipment Co Ltd All rights reserved No part of this publication may be reprinted or translated in any form or by any means without the prior permission of Adam Equipment Adam Equipment reserves the right to make changes to the technology features specifications and design of the equipment without notice All information contained within this publication is to the best of our knowledge timely complete and accurate when issued However we are not responsible for misinterpretations which may result from the reading of this material The latest version of this publication can be found on our Website
17. when on or when the Zero Enter zeroing the scale key is pressed Platform is not installed Improper calibration of the scale Damaged load cell Damaged Electronics Err 6 A D count is not correct when Load cell is damaged turning the scale on Electronics is damaged Err Percent input error Percent function is entered with no reference mass on the pan Err 8 High limit input error Low limit is set first then the high limit is set lower than the low limit and high limit not equal to zero Err 9 Low limit input error High limit is set first then the low limit is set higher than the high limit and low limit not equal to zero FAIL H or Calibration error Improper calibration should be within FAILL 10 of the factory calibration The old calibration data will be retained until the calibration process is complete Adam Equipment Company 2007 7 5 0 CBK DESCRIPTION The CBK scales have an enclosure with all components mounted within it To gain access to the components remove the 5 screws securing the cover to the base The basic unit consists of Base Load Cell frame Power switch Main PCB assembly Battery Display PCB assembly Keypad SASSIS All models of CBK are similar except the selection of load cells and the program Normally if a problem is found with a circuit board the most cost effective method of solving the problem is to replace the circuit board The main PCB assembly includes v A
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