Adam Equipment QBW 1.5 Service Manual Download

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Adam Equipment

QBW Scale

SERVICE MANUAL

ADAM EQUIPMENT CO. LTD.

p.n. 6064, Rev. A, June 2005

@Adam Equipment Company 2004

Summary of Contents for QBW 1.5

Page 1: ...Adam Equipment QBW Scale SERVICE MANUAL ADAM EQUIPMENT CO LTD p n 6064 Rev A June 2005 Adam Equipment Company 2004 ...

Page 2: ... Adam Equipment Company 2004 ...

Page 3: ... DISPLAY AND KEYS 5 POWER 5 ZERO TARE 6 WEIGHING UNITS SELECTION 7 CALIBRATION 7 USER SETUP PARAMETERS 8 FUNCTION OF THE KEYS 8 BUZZER ON OFF 9 AUTO SWITCH OFF TIME 9 ENABLED UNITS 10 VIEWING ADC COUNTS 10 LOADING DEFAULTS 10 ERRORS 11 QBW HARDWARE OVERVIEW 12 QBW ASSEMBLY 16 LOAD CELL ASSEMBLY 19 ...

Page 4: ...ght Grams Kilograms Ounces Pounds or Pounds Ounces SPECIFICATIONS Operating temperature 0ºC TO 40ºC 32ºF TO 104ºF Battery Internal Rechargeable Battery approx 150 hours Operation Power Supply Adapter 9 VAC 500mA Applications General Purpose Weighing Scale Stabilisation Time 2 seconds typical Calibration Manual External Display 4 and 1 2 Digits LCD Display Balance Housing ABS Plastic Stainless Stee...

Page 5: ... 0 002 kg Ounces 211 6 oz 211 6 oz 0 1 oz 0 1 oz Pounds 13 23 lb 13 23 lb 0 01 lb 0 01 lb Pounds Ounces 13 lb 4 oz 13_ 4 lb oz 1 oz 0_ 1 lb oz SCALE RANGE 15 kilograms SELECTED UNITS FULL SCALE DISPLAY RESOLUTIO N DISPLAY Grams 15000 g 15000 g 5 g 5 g Kilograms 15 000 kg 15 000 kg 0 005 kg 0 005 kg Ounces 529 0 oz 529 0 oz 0 2 oz 0 2 oz Pounds 33 06 lb 33 06 lb 0 02 lb 0 02 lb Pounds Ounces 19 lb ...

Page 6: ...onnections between load cell and the main board Weighing readings are incorrect Scale requires re calibration Recalibrate using external reference mass Weighing readings are unstable Draught or vibration Ensure scale is placed on a firm vibration free surface away from sources of draught Display shows E OL during weighing Weighing pan is overloaded Remove weight from pan Display shows E Or during ...

Page 7: ...he scale indicates that a load is in place on the scale at power up an error message E Hi will flash on the display for about 5 seconds If the reading from the scale indicates that the weighing pan is not in place on the scale at power up an error message E Lo will flash on the display for about 5 seconds The scale will then operate but will not have established a new no load value In order to ach...

Page 8: ... weight value will still be displayed as zero but will show the tare indicator instead of the zero indicator and the additional capacity before an overload condition is displayed will be reduced by the amount of weight on the scale when it was last tared If the scale is unable to obtain a stable weight value during the taring process after a number of retries it will display an error message E St ...

Page 9: ...e selected the value of the calibration mass required is the maximum capacity of the scale in Kilograms If imperial units i e Pounds Ounces or Pounds Ounces are selected the value of the calibration mass required is in Pounds as shown in the following table Maximum Scale Capacity kg Calibration Mass lb 1 5 3 3 5 6 10 15 30 30 60 The software includes checks to prevent the calibration from being pe...

Page 10: ...dure will be aborted and the scale will return to normal weighing using the previous tare and calibration values USER SETUP PARAMETERS FUNCTION OF THE KEYS To enter the user parameter setup menu the Zero Tare key should be held pressed and while the display is showing the Units key should be pressed The first setup option will then be shown Release both the keys If Zero Tare is released without th...

Page 11: ... TIME The default value for this parameter is OFF 0 auto switch off disabled The display will show OFF x where x 0 to 9 representing the number of minutes of inactivity i e if no key is pressed for the specified auto switch off time displayed in minutes the scale will automatically switch off A value of 0 will disable the auto switch off while a value of 9 will cause the scale to switch off approx...

Page 12: ... to save any change of unit enable state and return to normal weighing VIEWING ADC COUNTS The ADC counts value may be viewed by holding the Cal and Units keys pressed simultaneously at the end of the power on display test The raw ADC counts as a number from 0 to 30 000 will be displayed with 15 000 subtracted to give a displayed range of 15 000 to 15 000 counts This mode can be exited at any time ...

Page 13: ...attempt to ensure that the results obtained are sensible Potential error messages and their causes are detailed in the following table At power up E Lo A D counts more than 10 of scale capacity below default no load value E Hi A D counts more than 10 of scale capacity above default no load value Taring E St Taring could not be performed because the readings were not stable No load Calibration E Lo...

Page 14: ...ugh R3 exceeds about 500mA the voltage drop across it reaches about 0 7 volts at which point the regulator begins to reduce the output voltage thus limiting the output current The mains adaptor therefore needs to be capable of supplying a continuous current of at least 500mA The voltage drop across R3 and hence the voltage supplied to the ADC board and the battery will depend upon the amount of cu...

Page 15: ...ately for the digital and analogue components and commoned together at one point only via inductor L2 Since the minimum voltage difference required across the LM2931 to maintain regulation is about 0 3 volts the DC input voltage to the board must be a minimum of about 5 1 volts to maintain the required supply to the ICs If this voltage falls below about 5 25 volts the output of the comparator form...

Page 16: ...the 1 5 kilogram scale SB1 should be left open For the 3 6 15 and 30 kilogram scales SB1 should be bridged The output from this amplifier is fed into the inverting input of a low pass filter formed by the operational amplifier U5a which has its non inverting input set to a reference voltage of about 2 5 volts then via resistors R25 and R24 into the inverting input of an integrator formed by the op...

Page 17: ...r via transistor Q3 Since the reset state for all outputs on the controller is high a PNP transistor connected to the digital 5 volt supply is used so that an output high state turns the buzzer off and setting the output low turns the buzzer on Port pins 3 and 4 are connected via linkable headers to ground and can be read by the software for configuration or security purposes If no link is fitted ...

Page 18: ... be tightened as much as possible without stripping the threads Isolate shield wire with heat shrink tubing if this is not already done Install the M4 x 50 pan head underload screw through the top frame into the threaded hole in the centre of the bottom frame with an M4 locking nut between the frames Adjust screw so head is just clear of top frame and lock into position with nut against top of bot...

Page 19: ...l charge When power is removed it will flash red as the voltage disappears Place pan support and pan on the top frame Press On to turn on scale New PCB s will detect that this is the first time the scale is active The display will show the A D counts Acceptable A D counts ranges at no load are shown in the table above Place a mass on the scale The number should become more positive With full capac...

Page 20: ...he display will then show the mass to be used e g C 6 kg for 6kg mass Place this mass on the platform Press the Cal key again Scale will calibrate then show the mass value Remove the mass Verify the scale returns to zero Turn off the scale then turn it back on again after a few seconds Verify the calibration is still the same Turn the scale off and remove the power supply connector ...

Page 21: ...Frame Note Large Holes for Access to mounting screws Small holes for pan support Bottom Frame Note Small 4mm holes for mounting Note Large Holes to clear foot M6 Flat Washer M6 Shakeproof Washer M6 X 16 Hex Socket Cap Screw 4 sets of hardware in total Cable Adam Equipment Company 2004 19 ...

Page 22: ... Adam Equipment Company 2004 20 ...

Page 23: ...ction 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 use...

Page 24: ...e 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 Republic of South Africa Pho...

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