Accu-Turn 1250, Руководство по обслуживанию, Страница: 7 / 85

M 0495
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4
2
6
4
5
3
2
1
GB
3 - ASSEMBLY OF THE PIEZO MEASURERS
Problems of excessive compensation and out-of-phase sometimes depend on a fault in the piezo measurers.
To replace them, proceed as follows:
1. Remove the weight shelf.
2. Remove nuts 1 and 2 with relative cup springs and washers.
3. Back-off screws 3, 4, 6 and 5 then disassemble the various parts.
4. Reassemble the various parts without tightening the nuts being careful to follow the correct sequence.
N.B.: Mount the piezo units in accordance with the position of the coloured wires shown in the drawing.
5. Keeping the spindle perfectly aligned, tighten the nuts 5 and 6 with a spanner, and nuts 3 and 4 by hand (by half a
turn with the spanner if necessary).
6. Refit the washers, cup springs and nuts 1 and 2. Tighten the nuts fully in order to fully regain the elasticity of the cup
springs, then loosen them by half a turn. This will automatically ensure correct preloading on the piezo (a torque
wrench can be used set to 400 kg. cm.).
7. Cover the piezo units with a generous layer of silicone.( N.B.: For correct operation, insulation of the piezo
crystals should be greater than 50 Mohm ).
8. Reassemble the various parts.
9. Again carry out the automatic calibration.
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