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@Adam Equipment Company 2004

Adam Equipment

AQT SERIES

SERVICE MANUAL

ADAM EQUIPMENT CO. LTD.,

P.N. 6200, Rev A, September 2004

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Summary of Contents for AQT Series

Page 1: ... Adam Equipment Company 2004 Adam Equipment AQT SERIES SERVICE MANUAL ADAM EQUIPMENT CO LTD P N 6200 Rev A September 2004 ...

Page 2: ...3 0 INTRODUCTION 3 4 0 REMOVING THE COVER 4 5 0 LOAD CELL DAMAGE 4 6 0 PRINCIPLE OF OPERATION 5 7 0 GAIN AND ZERO ADJUSTMENT 6 8 0 ERROR MESSAGES 7 9 0 TROUBLE SHOOTING GUIDE 7 10 0 AUTO CALIBRATION 8 10 1 AUTO CALIBRATION FOR AQT 200 ONLY 8 10 2 AUTO CALIBRATION FOR ALL OTHER MODELS 9 ...

Page 3: ...g 0 1g 0 2g 1g 1g Linearity 0 02g 0 1g 0 1g 0 2g 1g 1g Units of Measure g ct oz dwt tL H tL S tL t g ct oz dwt kg g lb oz Stabilisation Time 3 seconds 2 seconds 3 seconds 2 seconds Operating Temperature 0ºC to 40ºC 32ºF to 104ºF Power Supply 9 12 VAC 100ma adapter or 6x AA batteries Calibration Push button calibration using external mass Calibration Mass 200g 250g 600g 1500g 2000g 5000g Display 6 ...

Page 4: ...erter for conversion to a digital value for use by the microprocessor It may be necessary to replace a load cell if it is damaged In this case it may be necessary to change resistors on the PCB to force the A D counts to be correct A table showing the resistor values and A D counts follows The scales have the ability to view the counts from the A D converter Press the Units key then turn on the sc...

Page 5: ... scale ON to observe the A D counts The counts should go from a smaller value typically 2000 8000 to a larger value as weight is added to the pan The value shown should also be stable If the A D counts are outside this range or cannot be seen then it will be necessary to trouble shoot the load cell load cell connections to verify the load cell is working correctly and has not been damaged The most...

Page 6: ...heir resistance will increase 3 5 0 o h m 3 5 0 o h m 3 5 0 o h m 350 ohm A B C D E S E S BALANCED BRIDGE 10 VOLT POWER SUPPLY Vout O VOLTS BETWEEN S AND s 3 5 1 o h m 3 4 9 o h m 3 5 1 o h m 349 ohm A B C D E S E S UNBALANCED BRIDGE FULL CAPACITY LOAD ON THE LOAD CELL 10 VOLT POWER SUPPLY Vout 0 028 VOLTS 28mv BETWEEN S AND s This will cause the bridge to become unbalanced When the bridge has a v...

Page 7: ... 2000 8000 2000 8000 5000 15000 2000 8000 2000 8000 Increase in counts when maximum load is added 80 000 100 000 20 000 35 000 35 000 50 000 80 000 100 000 20 000 35 000 35 000 50 000 Gain Resistor normally used R49 250 ohm 300 ohm 250 ohm 390 ohm 390 ohm 195 ohm If the A D counts for the no load condition Zero are too low increase the value of R47 or R46 which ever is in use to typically 1700 ohm...

Page 8: ...HI Overload EEEELO A D value too low Low battery replace battery if used Check the external power supply if batteries are not used 9 0 TROUBLE SHOOTING GUIDE PROBLEM POSSIBLE CAUSES Display is blank Mains power is turned off No turn on test Power supply not plugged in Power supply faulty Display is disconnected or faulty After turn on test Pan not installed Error message is Unstable weight Display...

Page 9: ...ed when the balance is initially installed or if the balance is moved from a location With time and use mechanical deviations may occur Therefore calibrate the balance whenever the best accuracy is required or when any deviation is observed during weighing a test weight Before calibrating it is necessary to have the proper calibration weights The weights should be OIML Class M1 type or better If y...

Page 10: ...to turn the power on for 1 minute Enter calibration mode Press On Off to turn the power off Press Unit first and then press On Off while keeping the Unit key pressed The display will show the A D value Calibration Wait for the stable indicator to be displayed Press Unit the display will show After 2 seconds the display will return to A D value Place the maximum weight eg 2000g for AQT2000 on the p...

Page 11: ... Adam Equipment Company 2004 10 ...

Page 12: ... 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 interf...

Page 13: ...tronic Scales for Medical use Retail Scales for price computing Adam Equipment Co Ltd Bond Avenue Milton Keynes MK1 1SW UK Phone 44 0 1908 274545 Fax 44 0 1908 641339 e mail sales adamequipment co uk Adam Equipment Inc 26 Commerce Drive Danbury CT 06810 USA Phone 1 203 790 4774 Fax 1 203 792 3406 e mail sales adamequipment com Adam Equipment S A Pty Ltd P O Box 1422 Kempton Park 1620 Johannesburg ...

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