Bel High Capacity Service Manual - Intelligent Weighing Technology
Contents
1. _ Teneo FLATEFoRcoLciAWpNG _ ess suecrroncor _ ELECTRIALRLATEFORGOL _ LJ 7 16 17 ELECTRICAL PLATE FOR CENTRAL LEVEL 16KG4 COVER FOR MAGNET 02 02 0120 16KG 2 SCREW M4x10 16KG 3 MAGNET 02 14 0063 16KG4 POLE SHOE 02 90 0064 BASE 02 05 0364 16KH2 OPTICAL GROUP COMPLETE SCREW Bel High Capacity Service Manual doc Page 8 of 30 16KH4 BOARD GO REV 0 0 ST 0013 16 5 SCREW M3x12 SPACER 16KH 7 ELECTRICAL PLATE ST 0008 16KH8 COLUMN FOR MECHANICAL GROUP 02 04 0137 ELECTRICAL PLATE FOR OPTICAL wee GROUP 900099 Bel High Capacity Service Manual doc Page 9 of 30 Page 10 of 30 Bel High Capacity Service Manual doc Y A A mONO CIS K lal i Page 11 of 30 ity Service Manual doc Bel High Capac Page 12 of 30 Bel High Capacity Service Manual doc o al lt Page 13 of 30 Bel High Capacity Service Manual doc Page 14 of 30 ity Service Manual doc Bel High Capac POSITION OF END STOP Bel High Capacity Service Manual doc Page 15 of 30 Page 16 of 30 Bel High Capacity Service Manual doc Page 17 of 30 Bel High Capacity Service Manual doc Page 18 of 30 Bel High Capacity Service Manual doc Position of Sensor Soldered Point Co2. OMEGA SHIELD DETALOF END STOP POSTION FOR LEVE tear CENTRAL LEVEL COMPLETE rene _ tet BASE OPTICAL GROUP COMPLETE Bel High Capacity Service Manual doc Page 4 of 30 Page 5 of 30 Bel High Capacity Service Manual doc PARTICULARS CELL ENBLOCK FOR MARK 16K TOP PARALLEL GUIDE 02 06 0361 16KA 3 WASHER FOR SCREW M4 16KA4 FLAT SPRING LEGP1 0 14 02 08 0260 BOTTOM PARALLEL GUIDE 02 06 0362 16KB 3 WASHER FOR SCREW M4 16 4 FLAT SPRING LEGP1 0 14 02 08 0260 Teque 16KC 1 SUPPORT FOR PARALLEL GUIDE 02 07 0360 16KC 2 BUSH FOR CORNER ERROR 02 15 0124 16KC 3 SCREW FOR CORNER ERROR 02 15 0125 K 16KC5 WASHER FOR SCREW M5 MOVING PILLAR 02 06 0071 16KD 2 VERTICAL FLAT SPRING LT1 0 14 02 50 0264 Bel High Capacity Service Manual doc Page 6 of 30 16KD 3 SPACER FOR VERTICAL FLAT SP 1mm 02 02 0417 16KD 4 PLATE FOR V SPRING CLAMPING 0202 0118 wos sown WaSHERFORSoREWwe Uwe puateroniooe _ sexe spacen ronron verra _ LOL NM 77 Des RATSPRNGLEGPr ou onam _ seu wes PLATEFORY SPRNGGUMPRG ozoeone _ 16KE 8 SCREW M3x6 16KE 9 END STOP 02 90 0133 16KF 2 FLAT SPRING LEGP1 0 12 02 08 0259 16KF 3 SPACER FOR FULCRUM FLAT SPRING 02 07 0131 Bel High Capacity Service Manual doc Page 7 of 30 16KF 4 SCREW M4x10 16KF 5 WASHER FOR SCREW M4 o eanvoewrencouvrenveckt
3. 00 2200 3300 4100 0 01 0 1300 2600 3900 2020 0 01 0 1 0 600 1200 1800 8055 0 01 0 1 0 1700 3400 5100 6045 0 01 0 1 0 1500 3000 4500 SSR 10000 0 1 1 9 0 3300 6600 9900 4500 0 1 0 1500 3000 4500 6500 0 1 0 2000 4000 6000 8000 0 1 0 2500 5000 7500 12 0 1 0 4000 8000 12000 K 16 0 1 0 5000 10000 15000 K 20 0 1 0 6000 12000 18000 K 30 0 1 0 10000 20000 30000 Bel High Capacity Service Manual doc Page 22 of 30 Fault Finding on Bel Engineering Balances Test Points TP 7 is Analog Ground TP 8 is Digital Ground Symptom Display frozen 00000 No output 1 Check that all springs and flexures are intact and not bent or broken If damaged replace and reassemble Jigs are available on request for this purpose Check that Level E1 is centered i e moves up and down and when power is supplied to the balance the Level tries to return to the mid point If not centered check power supply voltage TP3 to TP7 Analog Ground Voltage must be 12 VDC or more If not see Section a If voltage at TP3 is correct check voltage at TP4 to TP7 This should read 12 5 VDC if not see Section b If this is OK remove J6 connector and check with meter that resistance between coil connections see diagram on page 19 of manual Resistance between right and left should be 38 42 O If not correct or no resistance check connection from coil to optical group Board F1 Possible cause is the gold wires connecting monoblock to the level are broken
4. If none of the above it is possible that the optical group itself has failed Remove and replace If this measurement is not correct remove J4 connector and check the output on U 7812 Rectifier This should be 12 volt If not remove and replace the power board If this measurement is not OK remove J4 connector amp check output on U3 7912 this should be 12 5 volt If not correct remove and replace the power board See drawing ALINT Rev 4 Bel High Capacity Service Manual doc Page 23 of 30 Optical Group To check veracity of signal from optical group a With the pan fitted but no load on pan at rest test between TP7 ground and TP6 the value should be minus 3 3 volts minimum signal See FIG 1 Ey oscuLoscoPt 005 6220 Generally factory set for 1 volt reading this will allow technicians to see a negative reading when the pan is removed rather than an underweight signal If the Signal shown is below minus 3 3 volts See FIG 2 Bel High Capacity Service Manual doc Page 24 of 30 b Apply full load to balance Test between TP7 and TP6 It is important that the positive signal is 0 3 volts or more FIG 3shows correct reading FIG 4 shows incorrect reading If either signal is not correct change the resistance at 70 No load no negative signal increase resistance Full load no positive signal decrease resistance Bel High Capacity Service Manual doc Page 25 of 30 Note on analytical ba
5. intelligent Weighing Technology Service Manual Bel High Capacity Balances Intelligent Weighing Technology serves the scale industry in the USA Canada Central and South America We provide competitive pricing on a complete range of scales from floor scales to laboratory scales load cells for spare parts and scale manufacturing along with other specialist weighing and testing equipment Intelligent Weighing Technology has more than 50 years of experience in the scale business both in the USA and worldwide With contacts in over 50 countries including the USA we provide you with the weighing equipment you need 5528 Everglades Street Suite B Ventura CA 93003 Phone 805 642 3034 Fax 805 642 4034 Mobile 805 444 5657 Toll Free 866 920 3000 Toll Free 86 920 3000 sales intelligentwt com www intelligentwt com Bel High Capacity Service Manual doc Page 1 of 30 BEL ENGINEERING ELECTRONIC BALANCES SERVICE MANUAL 12 16 20K OCTOBER 2003 REV 2 0 Bel High Capacity Service Manual doc Page 2 of 30 intelligent Weighing Technology Note The power supply for Bel balances is 120 VAC input and 24VAC output 12 1 03 Bel High Capacity Service Manual doc Page 3 of 30 WEIGHING CELL ENBLOCK FOR MARK 16K 16 TOP PARALLEL GUIDE COMPLETE BOTTOM PARALLEL GUIDE COMPLETE 16KC SUPPORT FOR PARALLEL GUIDE AND REGULATOR FOR CORNER ERROR MOVING PILLAR COMPLETE 16KE M BIG LEVEL AND
6. lances the balance should be returned to Intelligent Weighing Technology for fitting of specialized resistances To check the clock speed of DSP Test between TP 7 and TP 13 you should be able to clearly see equal distances between signal values and 3 3 volts positive between signal values If no signal Crystal Y1 is malfunctioning 7 3728 FIG 5 shows correct reading Test TP 7 to TP 12 Should show wide band on screen FIG 6 1 OSCILLOSCOPE go Bel High Capacity Service Manual doc Page 26 of 30 A thin band shows a malfunction If the band is thin change crystal Y2 Bel High Capacity Service Manual doc Page 27 of 30 Test Thermometer Frequency to Analog to Digital converter Test TP 7 to TP 14 FIG 8 shows correct signal See FIG 9 showing bad or no signal Possible cause is inverted signal wires on connections to magnet Bel High Capacity Service Manual doc Page 28 of 30 TP 7 to TP 16 Signal must be 5 VDC if not suspect U15 thermometer is faulty TP 7 to TP 15 Signal should be 2 5 to 3 VDC if not suspect U16 thermometer is faulty TP 7 to TP 11 This is a reference voltage it should be 7 VDC If not suspect U18 Under Foam Insulator is faulty Removal of Magnet Remove top 3 screws from cover and remove Remove the two wires from the base of the magnet note they must be reattached in the same order Remove the three positioning grub screws and the two i
7. nd instability Replace complete group Display Error Codes Display shows Underweight Condition Display shows Overweight Condition Following power up and pressing On Off display shows lt balance is not stable Check for interference vibration air currents If OK remove top plate from magnet and clean Check that the lever is centered in the magnet and will return to the center when moved power must be connected Finally check flexures and vertical and horizontal springs for distortion or damage Poor Return To Zero 1 Check all flexures and vertical springs for damage or breakage and replace where neccessary 2 Remove magnet cover and clean Check lever for physical interference Bel High Capacity Service Manual doc Page 30 of 30
8. nner ones same threaded hole and withdraw magnet from unit Inspect and clean then replace using 4 spacers to position the magnet in the exact middle of the unit only if you moved the level arm If there is drift in the balance and it is always in one direction then suspect that there is physical damage to the system Start with magnet then gold connecting wires finally the flexure system Display No Power to Display Check power to jack plug 24 VAC If no power or not correct voltage then replace the complete unit If the above are OK connect meter to TP7 and TP2 DC voltage should read 5 volts 2 if not OK see section A 1 If voltage is OK then check TP7 to TP1 should read 3 3 volts 2 If not OK see section A 2 If OK then TP7 to TP5 should be 32 34 VDC for display Seesection A 1 If this is OK change the display Note Be sure to order the same build code as on the back of the display unit If the display has power but does not illuminate any segments when pushing the on off switch fit new keyboard K 8 Bel High Capacity Service Manual doc Page 29 of 30 Section A A 1 Change power supply board K 14 See ALINT Rev 4 B A 2 Check TP 7 ground to regulator U8 LM 3940 Should read 5 0 VDC input and 3 3 VDC output If no output change regultor or main board If none of the above cure the problem change the main board K 22 Bil 2407 A rev 1 It is possible for the optical group to cause interference a
9. rner Load Error 12 16 20 kg Capacity Corner load adjustment for 12 16 20 K models is the following and it is different from adjustment of 6K Access top the two regulators is through the two apertures in the side casing A adjusts X and Y B adjusts V and Z If V is positive rotate the regulator B anticlockwise If Y is positive rotate the regulator A clockwise And vice versa Bel High Capacity Service Manual doc Page 19 of 30 Bel Engineering Service Notes Balances High Capacity Bel balances are calibrated and linearized in California prior to shipping using Class 1 weights traceable to NIST or Class M OIML weights traceable to OIML Europe Upon receipt they should only need calibtration to take account of local cceleration due to G factors The balances should always be placed on a solid stable and vibration free surface and free from drafts and air currents Do not use balances in bright sunlight as this may set up uneven temperature changes in the unit When the unit is positioned correctly power up the unit and for analytical or milligram balances do not press the On Off button for at least 25 minutes Following the warm up period press the On Off button Decigram Classic and Centigram balances can be used immediately but correct use analytical balances should remain turned on for at least 2 hours before calibration or use Milligram balances should ideally be allowed to stabilize for 30 min
10. utes after turning on Bel High Capacity Service Manual doc Page 20 of 30 Calibration Linearity In order to linearize the balance correctly the balance should be allowed to warm up for at least 2 hours for analytical balances and 30 minutes for other balances Press and keep pressing CAL then plug in the power supply The scale displays the notional thermometer reading and then 00000 Press CAL three times Display reads LIN Press PRINT Display shows ZERO balance will set zero Press CAL again no weight on pan Displays LIN 1 amp arrow at 2nd ZERO Load 1 39 weight See attached chart for linearity weights Press CAL when stable Displays LIN 2 amp arrow on 3rd ZERO Load 2 3rd weight Press CAL when stable Displays LIN 3 amp arrow on 4th ZERO Load Full Weight Press CAL when stable End by pressing On Off Always recalibrate after LINEARITY adjustment Bel High Capacity Service Manual doc Page 21 of 30 Linearization Values for Bel Balances Point Point Point Point Model Resolution g 1 2 3 4 120A 0 0001 0 40 80 120 150A 0 0001 0 50 100 150 205A 0 0001 0 60 120 180 160 0 001 0 50 100 150 220 0 001 0 70 140 210 330 0 001 0 110 220 330 500 0 001 0 150 300 450 2040 0 001 0 01 0 130 260 390 2060 0 001 0 01 0 200 400 600 800 0 01 0 250 500 750 1000 0 01 0 300 600 900 1300 0 01 0 400 800 1200 1700 0 01 0 500 1000 1500 2200 0 01 0 700 1400 2100 3100 0 01 0 1000 2000 3000 3500 0 01 0 11
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