Series 490 Contents
Inhaltsverzeichnis
Precisa Gravimetrics AG Index c2 i 3
5. Display board VFD / Displayprint VFD 320-7204-010 ..................................... C36
5.1 Schematic / Schema 320-7204-010............................................................................... C36
5.2 Assembly board / Bestückung print 320-7204-010 ........................................................ C37
5.3 Parts list / Stückliste 320-7204-010................................................................................ C38
Section D: Repairs - - - - - - - - - - - - - - - - - - - - - - - - - - - - D1
1. Service tools and equipment.............................................................................. D2
1.1 Tool set series 490 (350-8572) ........................................................................................ D2
1.2 Equipment........................................................................................................................ D3
2. Opening up a balance ......................................................................................... D4
2.1 General procedure for opening up a Series 490 balance ................................................ D4
2.2 General procedure for opening up a Series 490 IP65 balance........................................ D4
3. Dismantling the weighing cell ............................................................................ D5
3.1 Removing the housing‘s top............................................................................................. D5
3.2 Removing the calibration unit (only SCS) ........................................................................ D5
3.3 Removing the weighing cell from the housing‘s bottom................................................... D5
3.4 Removing the cross holder .............................................................................................. D5
3.5 Removing the balance arm .............................................................................................. D6
3.6 Removing the coil............................................................................................................. D7
4. Replacement the flexure strap and flexure sheet............................................. D8
4.1 Replacement the flexure strap ......................................................................................... D8
4.2 Replacement the flexure sheet ........................................................................................ D8
4.3 Replacement the flexure sheet on balance arm............................................................... D9
5. Cleaning ............................................................................................................. D10
5.1 Cleaning the pot.............................................................................................................D10
5.2 Cleaning the coil ............................................................................................................D10
5.3 Final check of cleaning................................................................................................... D10
6. Assembling the weighing cell .......................................................................... D11
6.1 Assembling the coil and the balance arm ...................................................................... D11
6.2 Assembling the cross holder.......................................................................................... D11
6.3 Assembling the weighing - cell in the housins‘s bottom................................................. D12
6.4 Assembling the Selfcalibration System .......................................................................... D13
7. Adjustment......................................................................................................... D14
7.1 Set the balance to the service-mode.............................................................................. D14
7.2 Adjusting of the symmetry.............................................................................................. D14
7.3 Checking the pre-load .................................................................................................... D15
7.4 Adjusting of the corner load ........................................................................................... D15
7.5 Checking the hysteresis and unstability......................................................................... D16
7.6 Final assembly of the balance........................................................................................ D17
7.7 Checking the corner load ............................................................................................... D17
7.8 Linearisation of a balance .............................................................................................. D17
7.9 Final check of the adjustment ........................................................................................ D17
7.10 S-correction of a balance ............................................................................................... D18
7.11 Adjustment of the internal calibration weight (only SCS) ............................................... D19
8. Final control....................................................................................................... D20
9. Error message ................................................................................................... D21
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